2,832 results match your criteria Operative Dentistry [Journal]


Effects of pH and Application Technique of In-office Bleaching Gels on Hydrogen Peroxide Penetration into the Pulp Chamber.

Oper Dent 2019 Apr 22. Epub 2019 Apr 22.

Objective: This study aimed to quantify the penetration of hydrogen peroxide (HP) into the pulp chamber in teeth submitted to in-office bleaching with varied pH and application techniques. The color change and pH of the in-office bleaching product during application was also evaluated.

Methods And Materials: Ninety-six human premolars were used and randomly divided into 10 groups (n=9) according to the following combination of factors: pH of in-office bleaching agents (two neutral/alkaline pH: Opalescence Boost 38% and Whiteness HP Blue 35% and three acidic pH: Whiteness HP Maxx 35%, Lase Peroxide Sensy 35%, and Total Blanc Office 35%) and application modes (for 3 × 15 minutes [3×15] and 1 × 45 minutes [1×45]). Read More

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http://dx.doi.org/10.2341/18-148-LDOI Listing

Optical Stability of High-translucent Resin-based Composites.

Oper Dent 2019 Apr 12. Epub 2019 Apr 12.

This study investigated the stability of the optical properties of high-translucent shades of dental resin-based composites. Four commercial materials (Filtek Z350 XT, Opallis, Amelogen Plus, and IPS Empress Direct) and 14 non-Vita shades were tested. Disc-shaped specimens for each resin-based composite-shade combination (n=6) were evaluated at T (baseline), T (after 30 days of storage in water), and T (after 30 days of storage each in water and a coffee solution). Read More

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http://dx.doi.org/10.2341/18-025-LDOI Listing
April 2019
1 Read

Influence of Bleaching and Aging Procedures on Color and Whiteness of Dental Composites.

Oper Dent 2019 Apr 12. Epub 2019 Apr 12.

Bleaching can cause perceptible color changes on resin-based composite (RBC) restorations that may not be stable with aging. The objective of this study was to evaluate color stability and whiteness variations of RBCs after bleaching and aging procedures. Discs (10 mm in diameter and 1 mm thick) of shades A2 and A3 were fabricated from two RBCs (Filtek Z250 and Filtek Z350 XT) and divided into three subgroups (for each composite and shade) (n=5) as follows: control (no bleaching), at-home bleaching, and in-office bleaching. Read More

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http://dx.doi.org/10.2341/18-209-LDOI Listing

Effects of Pretreatment, Specimen Thickness, and Artificial Aging on Biaxial Flexural Strength of Two Types of Y-TZP Ceramics.

Oper Dent 2019 Apr 12. Epub 2019 Apr 12.

Objectives: To evaluate the effects of surface treatment, specimen thickness, and aging on the biaxial flexural strength (BFS) of two types of yttria-stabilized, tetragonal zirconia polycrystal (Y-TZP) ceramics.

Methods And Materials: Disc-shaped specimens, 0.4 and 1. Read More

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http://dx.doi.org/10.2341/18-071-LDOI Listing

Effect of Conventional and Acid-modified Casein Phosphopeptide-Amorphous Calcium Phosphate Crèmes on Dentin Permeability Before and After Acid Challenge.

Oper Dent 2019 Apr 5. Epub 2019 Apr 5.

This study investigated the effect of conventional and acidified casein phosphopeptide-amorphous calcium phosphate-containing crèmes (CPP-ACP and ACPP-ACP) on dentin permeability (DP) before and after acid challenge, using a fluid-flow measuring device and scanning electron microscopic (SEM) examination. Fifty dentin discs were prepared from intact human third molars. Each tooth was sectioned 3 mm above and below the cementoenamel junction. Read More

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http://dx.doi.org/10.2341/17-382-LDOI Listing

A Randomized Double-blind Clinical Trial of Dentin Surface Treatments for Composite Restorations in Noncarious Cervical Lesions: A 36-month Evaluation.

Oper Dent 2019 Mar/Apr;44(2):114-126. Epub 2018 Dec 5.

Objective:: This randomized, double-blind clinical trial aimed to evaluate the influence of different dentin surface treatments in noncarious cervical lesions (NCCLs).

Methods And Materials:: Twenty-nine patients participated in this study. One hundred sixty-five NCCLs were selected and randomly assigned to three groups: G0 (control group) with phosphoric acid etching for 15 seconds; G1: phosphoric acid etching for 30 seconds; and G2: ultrasound probe applied for 30 seconds on the dentin surface. Read More

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http://dx.doi.org/10.2341/17-308-CDOI Listing
December 2018

Effect of Argon Plasma Surface Treatment on Bond Strength of Resin Composite Repair.

Oper Dent 2019 Mar/Apr;44(2):E75-E82

Objectives:: This study evaluated the effect of argon plasma treatment (PLA) and its combination with sandblasting (SAN), silanization (SIL), and hydrophobic bonding resin (HBR) application on the micro-shear bond strength of water-aged restorative resin composite to a newly placed composite, simulating restoration repair.

Methods And Materials:: Forty-five light-cured composite plates (20-mm long × 20-mm wide × 4-mm thick) were fabricated using a hybrid composite and stored at 37°C in distilled water for six months. The aged composite surfaces were treated according to the following experimental groups, varying both treatment and order of application: 1) SAN + SIL + HBR (control), 2) SAN + PLA for 30 seconds + SIL + HBR, 3) SAN + SIL + PLA + HBR, 4) PLA + SIL + HBR, 5) PLA + SIL, 6) PLA + HBR, 7) SIL + PLA + HBR, 8) SIL + PLA, and 9) PLA. Read More

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http://dx.doi.org/10.2341/18-050-LDOI Listing

Delayed Photoactivation of Dual-cure Composites: Effect on Cuspal Flexure, Depth-of-cure, and Mechanical Properties.

Oper Dent 2019 Mar/Apr;44(2):E97-E104

Objectives:: This study tested whether delayed photoactivation could reduce shrinkage stresses in dual-cure composites and how it affected the depth-of-cure and mechanical properties.

Methods And Materials:: Two dual-cure composites (ACTIVA and Bulk EZ) were subjected to two polymerization protocols: photoactivation at 45 seconds (immediate) or 165 seconds (2 minutes delayed) after extrusion. Typodont premolars with standardized preparations were restored with the composites, and cuspal flexure caused by polymerization shrinkage was determined with three-dimensional scanning of the external tooth surfaces before restoration (baseline) and at 10 minutes and one hour after photoactivation. Read More

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http://dx.doi.org/10.2341/18-140-LDOI Listing

Tooth Sensitivity After Dental Bleaching With a Desensitizer-containing and a Desensitizer-free Bleaching Gel: A Systematic Review and Meta-analysis.

Oper Dent 2019 Mar/Apr;44(2):E58-E74

Objectives:: A systematic review and meta-analysis were performed to evaluate the risk and intensity of tooth sensitivity (TS) after dental bleaching with a desensitizer-containing and a desensitizer-free bleaching gel in adult patients. Color change and risk of gingival sensitivity was also evaluated.

Methods:: A comprehensive search was performed MEDLINE via PubMed, Scopus, Web of Science, Latin American and Caribbean Health Sciences Literature database (LILACS), Brazilian Library in Dentistry (BBO), EMBASE and Cochrane Library, and System for Information on Grey Literature in Europe (SIGLE) without restrictions to identify randomized clinical trials. Read More

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http://dx.doi.org/10.2341/17-253-LDOI Listing
March 2019
1 Read

Effect of Polymeric Microparticles Loaded With Catechin on the Physicochemical Properties of an Adhesive System.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

The objective of this study was to synthesize and characterize epigallocatechin-3-gallate (EGCG)-loaded/poly(D-L lactide-co-glycolide) acid (PLGA) microparticles, evaluate their effects on degree of conversion and release assay of adhesives, and subsequently to examine the resin-dentin bond strength of two EGCG formulations (free EGCG or loaded into PLGA microparticles) applied as a pretreatment or incorporated into an adhesive system. The formulations were prepared according to a PLGA:EGCG ratio of 16:1 using the spray-drying technique. The size and polydispersity index were determined by light scattering in aqueous dispersion. Read More

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http://dx.doi.org/10.2341/18-112-LDOI Listing
March 2019
1 Read

Effect of Immediate Dentin Sealing on the Bond Strength of Monolithic Zirconia to Human Dentin.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

Objective:: This study evaluated the shear bond strength (SBS) of pretreated monolithic zirconia surfaces bonded to human dentin following immediate dentin sealing (IDS) using two different self-adhesive resin luting agents.

Methods And Materials:: Sixty intact human third molars were collected, stored, sectioned appropriately, and molded according to ISO 29022:2013, resulting in 120 dentin specimens. Ceramic cylindrical specimens were fabricated using CAD/CAM technology and sintered as recommended (final bonding area A=2. Read More

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http://dx.doi.org/10.2341/18-198-LDOI Listing

The Influence of Distance on Radiant Exposure and Degree of Conversion Using Different Light-Emitting-Diode Curing Units.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

Objectives:: To investigate the influence of curing distance on the degree of conversion (DC) of a resin-based composite (RBC) when similar radiant exposure was achieved using six different light-curing units (LCUs) and to explore the correlation among irradiance, radiant exposure, and DC.

Methods And Materials:: A managing accurate resin curing-resin calibrator system was used to collect irradiance data for both top and bottom specimen surfaces with a curing distance of 2 mm and 8 mm while targeting a consistent top surface radiant exposure. Square nanohybrid-dual-photoinitiator RBC specimens (5 × 5 × 2 mm) were cured at each distance (n=6/LCU/distance). Read More

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http://dx.doi.org/10.2341/18-004-LDOI Listing

Full-mouth Rehabilitation of Hypocalcified-type Amelogenesis Imperfecta With Chairside Computer-aided Design and Computer-aided Manufacturing: A Case Report.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

Background:: This case report describes the complete full-mouth treatment of hypocalcified amelogenesis imperfecta (AI) by chairside computer-aided design and computer-aided manufacturing (CAD/CAM).

Case Summary:: After several years of interrupted dental care, a 17-year-old female patient presented with pain and also esthetic and functional discomfort. With loss of enamel and dyschromia affecting all teeth, the diagnosis was hypocalcified AI. Read More

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http://dx.doi.org/10.2341/17-241-TDOI Listing

Bond Strength Stability of Self-adhesive Resin Cement to Etched Vitrified Yttria-stabilized Tetragonal Zirconia Polycrystal Ceramic After Thermomechanical Cycling.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

The purpose of this study was to evaluate the influence of thermomechanical cycling on the bond strength stability of self-adhesive resin cement to vitrified yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. Y-TZP ceramic blocks were divided into four groups according to the surface treatments: AS, as sintered; SB, sandblasted with 50-μm AlO particles; LG, vitrification with a low-fusing glaze and etching with 10% hydrofluoric acid; and HC, vitrification with a ceramic liner and etching with 10% hydrofluoric acid. Lithium disilicate ceramic blocks etched with 10% hydrofluoric acid for 20 seconds (EM) were also tested. Read More

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http://dx.doi.org/10.2341/18-131-LDOI Listing

Is a Single Preliminary Session of In-office Bleaching Beneficial for the Effectiveness of At-home Tooth Bleaching? A Randomized Controlled Clinical Trial.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

Objectives:: To evaluate the effect of combining in-office with at-home bleaching procedures in terms of the time required to obtain satisfactory tooth color, final color changes, and tooth sensitivity (TS) reported by patients.

Methods And Materials:: Twenty-six patients enrolled in this study used 10% carbamide peroxide in a bleaching tray for 1 h/d until satisfactory tooth color was obtained. One-half of the participants underwent a preliminary session of in-office tooth bleaching with 35% hydrogen peroxide for 45 minutes. Read More

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http://dx.doi.org/10.2341/18-196-CDOI Listing

Fracture Toughness Analysis of Ceramic and Resin Composite CAD/CAM Material.

Oper Dent 2019 Mar 8. Epub 2019 Mar 8.

Objectives:: To evaluate and compare the fracture toughness of dental CAD/CAM materials of different material classes intended for in-office milling (glass ceramics, hybrid, resin composites) and the influence of aging on this property.

Methods And Materials:: The fracture toughness (critical intensity factor, K) values of 9 CAD/CAM restorative materials (Ambarino High-Class, Brilliant Crios, Cerasmart, exp. CAD/CAM composite, Katana Avencia, Lava Ultimate, VITA Enamic, IPS Empress CAD, and IPS e. Read More

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http://dx.doi.org/10.2341/18-161-LDOI Listing

Fracture Resistance of Endodontically Treated Maxillary Premolars Restored With Different Methods.

Oper Dent 2019 Jan/Feb;44(1):E1-E11

Purpose:: The purpose of this in vitro study was to evaluate the resistance and patterns of fracture of endodontically treated maxillary premolars (ETPs) restored with different methods.

Methods And Materials:: Mesio-occluso-distal cavities were prepared in 50 extracted caries-free human maxillary premolars after endodontic treatment. The teeth were divided into five groups (n=10), according to the restorative method. Read More

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http://www.jopdentonline.org/doi/10.2341/17-262-L
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http://dx.doi.org/10.2341/17-262-LDOI Listing
February 2019
4 Reads

Color Stability of Resin Cements Exposed to Aging.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

The aim of this study was to evaluate the color stability of light-cured and dual-cured resin cements after artificial accelerated aging. Ten specimens (6-mm diameter and 2-mm thickness) for each of five resin cements were prepared: GC (dual-cured cement, GCem), Vb (light-cured cement, Variolink II only the base), Vbc (dual-cured cement, Variolink II base with catalyst), VV (light-cured cement, Variolink Veneer), and FR (flowable resin composite, light cured). The samples were polished and stored in an accelerated artificial aging machine for 308 hours (160 klx), with cycles of 120 minutes under light and 60 minutes in the dark. Read More

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http://dx.doi.org/10.2341/18-064-LDOI Listing
January 2019

The Combination of CQ-amine and TPO Increases the Polymerization Shrinkage Stress and Does Not Improve the Depth of Cure of Bulk-fill Composites.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Objectives:: To evaluate the effect of combining camphorquinone (CQ) and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) on the depth of cure and polymerization shrinkage stress of bulk-fill composites.

Methods And Materials:: Experimental bulk-fill composites were produced containing equal molar concentrations of either CQ-amine or CQ-amine/TPO. The degree of in-depth conversion through each millimeter of a 4-mm-thick bulk-fill increment was evaluated by Fourier transform near-infrared microspectroscopy using a central longitudinal cross section of the increment of each bulk-fill composite (n=3). Read More

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http://www.jopdentonline.org/doi/10.2341/18-234-L
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http://dx.doi.org/10.2341/18-234-LDOI Listing
January 2019
9 Reads

Fracture Strength of Various Types of Large Direct Composite and Indirect Glass Ceramic Restorations.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Introduction:: The objective of this study was to investigate the mechanical behavior of severely compromised endodontically treated molars restored by means of various types of composite buildups, full-contour lithium disilicate crowns (with or without post) or a lithium disilicate endocrown.

Methods And Materials:: One hundred five sound molars were endodontically treated and randomly assigned to 1 control group (endodontic access cavity only) and 6 experimental groups (n=15): glass fiber reinforced composite (GFRC group), direct microhybrid composite (C group), direct microhybrid composite restoration with glass fiber post (CP group), composite buildup and full-contour lithium disilicate crown (LDS group), additional glass fiber post (P-LDS group), and endocrown (EC group). Molar crowns in the treatment groups were removed 1 mm above the cementoenamel junction and restored. Read More

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http://dx.doi.org/10.2341/18-111-LDOI Listing
January 2019

Bonding Interaction and Shrinkage Stress of Low-Viscosity Bulk Fill Resin Composites With High-Viscosity Bulk Fill or Conventional Resin Composites.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Objective:: To analyze the shrinkage stress, bonding interaction, and failure modes between different low-viscosity bulk fill resin composites and conventional resin composites produced by the same manufacturer or a high-viscosity bulk fill resin composite used to restore the occlusal layer in posterior teeth.

Methods & Materials:: Three low-viscosity bulk fill resin composites were associated with the conventional resin composites made by the same manufacturers or with a high-viscosity bulk fill resin composite, resulting in six groups (n=10). The bonding interaction between resin composites was tested by assessing the microshear bond strength (μSBS). Read More

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http://dx.doi.org/10.2341/18-163-LDOI Listing
January 2019
1 Read

Enamel Microabrasion and Dental Bleaching on Teeth Presenting Severe-pitted Enamel Fluorosis: A Case Report.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

The present clinical case report describes the clinical steps of enamel microabrasion associated with dental bleaching to restore severely-pitted fluorosed teeth. The process of removing the fluorotic superficial stains started by using macroabrasion with a water-cooled fine tapered 3195 FF diamond bur. Rubber dam isolation of the operative field was used to remove the remaining enamel stains and superficial irregularities with the Opalustre microabrasive compound (6. Read More

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http://dx.doi.org/10.2341/18-116-TDOI Listing
January 2019
1 Read

Restoration of a Mandibular Incisor With a Computer-aided Design/Computer-aided Manufacturing Fabricated Anterior Onlay.

Authors:
J May J Watson

Oper Dent 2019 Mar/Apr;44(2):109-113. Epub 2019 Jan 31.

The use of computer-aided design/computer-aided manufacturing (CAD/CAM) dentistry has triggered novel approaches to restoring teeth in ways that increase efficiency, improve esthetics, and conserve tooth structure. Endodontically treated mandibular incisors offer a challenging restorative opportunity due to the small amount of natural tooth structure and the required amount of reduction needed for restorative material. The case presented demonstrates how to leverage chairside CAD/CAM technology to restore a discolored and fractured endodontically treated mandibular incisor without the use of a post and core and completing the restoration in a single visit. Read More

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http://dx.doi.org/10.2341/18-217-SDOI Listing
January 2019

Long-term Follow-up of Complicated Crown Fracture With Fragment Reattachment: Two Case Reports.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Two cases of complicated crown fracture of the maxillary incisors were restored using the fragment reattachment technique. Root canal treatment was performed, and the fractured fragment was bonded to the tooth structure using a dentin adhesive system and a flowable composite resin, followed by the insertion of a fiber post using dual-cured resin cement. Reattached fragments have shown reliable prognosis without inflammatory signs around bonded junctions after long-term follow-up. Read More

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http://dx.doi.org/10.2341/18-201-TDOI Listing
January 2019
1 Read

Effect of Beam Profiles From Different Light Emission Tip Types of Multiwave Light-emitting Diodes on the Curing Profile of Resin-based Composites.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Light activation is an important clinical step for achieving success in restorative procedures. This study evaluated the influence of beam profile from different light emission tip types of multiwave light-emitting diodes (LEDs) on the curing profile of resin-based composites. Experimental composites were produced containing either camphorquinone (CQ) or diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) as a photoinitiator. Read More

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http://dx.doi.org/10.2341/16-242DOI Listing
January 2019

Elevation of an Amalgam-stained Margin With Resin-modified Glass Ionomer to Support an Indirect Ceramic Restoration: A Six-year Case Report.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

This case report presents treatment of a mandibular second molar with an extensive proximal margin, which was finished on amalgam-stained dentin. A resin-modified glass ionomer for margin elevation and a lithium disilicate onlay were used to restore the tooth to proper form and function. The patient has been followed for six years and has had no complications during this period. Read More

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http://dx.doi.org/10.2341/18-114-SDOI Listing
January 2019

Bonding Performance of Simplified Adhesive Systems in Noncarious Cervical Lesions at 2-year Follow-up: A Double-blind Randomized Clinical Trial.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Objectives:: This study aimed to evaluate the bonding performance of a universal adhesive used according to self-etching or etch-and-rinse protocols in noncarious cervical lesions (NCCLs) and to compare the two protocols with their respective gold standard techniques.

Methods And Materials:: This randomized, double-blind clinical study enrolled 34 participants who met the inclusion criteria, 29 of whom returned after two years. They received 152 restorations bonded with one of the three adhesives (Scotchbond Universal Adhesive, Adper Single Bond 2, or Clearfil SE Bond) and one of the two bonding techniques tested. Read More

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http://dx.doi.org/10.2341/18-049-CDOI Listing
January 2019
1 Read

In Vitro Evaluation of Surface Properties and Wear Resistance of Conventional and Bulk-fill Resin-based Composites After Brushing With a Dentifrice.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Objectives:: This study evaluated the effect of toothbrushing with a dentifrice on gloss, roughness profile, surface roughness, and wear of conventional and bulk-fill resin-based composites.

Methods And Materials:: Gloss and surface roughness of resin-based composites (RBCs; Admira Fusion X-tra, Aura Bulk Fill, Filtek Bulk Fill Flowable, Filtek Bulk Fill Posterior Restorative, Filtek Supreme Ultra, Herculite Ultra, Mosaic Enamel, SDR flow+, Sonic Fill 2, Tetric EvoFlow Bulk Fill and Tetric EvoCeram Bulk Fill) were analyzed before and after brushing; the roughness profile and wear were also determined after toothbrushing. Representative three-dimensional images of the surface loss and images comparing the unbrushed and brushed surfaces were also compared. Read More

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http://www.jopdentonline.org/doi/10.2341/18-200-L
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http://dx.doi.org/10.2341/18-200-LDOI Listing
January 2019
2 Reads

Clinical Study of Bleaching Gel Storage Temperature on Tooth Color and Sensitivity.

Oper Dent 2019 Jan 31. Epub 2019 Jan 31.

Objective:: The objective of this triple-blind, split-mouth, randomized clinical trial was to evaluate the bleaching efficacy and tooth sensitivity of an in-office bleaching agent submitted to different storage temperatures (room temperature at 21.04°C±3.13°C or refrigeration at 5°C). Read More

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http://dx.doi.org/10.2341/17-302-CDOI Listing
January 2019

Effect of Calcium and Fluoride Addition to Hydrogen Peroxide Bleaching Gel On Tooth Diffusion, Color, and Microhardness.

Oper Dent 2019 Jan 23. Epub 2019 Jan 23.

Objectives:: The aim of this study was to evaluate the effect of calcium and fluoride addition to a 35% hydrogen peroxide (HP) bleaching gel with regard to its diffusion through the tooth structure, enamel microhardness, and bleaching efficacy.

Methods And Materials:: Eighty specimens (6 mm in diameter and 2 mm in height; 1 mm/enamel and 1 mm/dentin) were obtained from bovine incisors that were polished and divided into four groups (n=20) according to the remineralizing agent added to the gel: Ca = 0.5% calcium gluconate; F = 0. Read More

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http://dx.doi.org/10.2341/18-113-LDOI Listing
January 2019

Gingival Health of Porcelain Laminate Veneered Teeth: A Retrospective Assessment.

Oper Dent 2019 Jan 23. Epub 2019 Jan 23.

Statement Of Problem:: The long-term effect of the presence of porcelain laminate veneers (PLVs) on the health of the surrounding gingival issues is not available in the restorative literature.

Purpose:: To assess the long-term effect of PLVs on the health of the surrounding gingival tissues. A secondary aim was to correlate gingival crevicular fluid (GCF) scores with clinical parameters used for gingival health assessment in teeth treated with PLVs. Read More

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http://dx.doi.org/10.2341/18-088-CDOI Listing
January 2019
1 Read

Amalgam Strength Resistance to Various Contaminants.

Oper Dent 2019 Mar/Apr;44(2):E83-E96. Epub 2019 Jan 23.

Purpose:: The purpose of this study was to quantify the relative strength tolerance of 1-day and 30-day amalgam following saturation contamination with water, saliva, blood, and handpiece lubricant oil during condensation.

Methods And Materials:: Valiant PhD XT amalgam was tested with 300 shear-strength (N=15) and 120 compressive-strength (N=6) specimens, divided into 1-day and 30-day groups, each with control, water, saliva, blood, and lubricant oil contamination samples. Shear specimens were condensed in 4 × 4-mm anchor wells inundated with contaminant fluids before adding a ring mold with 3. Read More

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http://dx.doi.org/10.2341/18-091-LDOI Listing
January 2019

The Use of Composite Layering Technique to Mask a Discolored Background: Color Analysis of Masking Ability After Aging-Part II.

Oper Dent 2019 Jan 23. Epub 2019 Jan 23.

The aim of this study was to evaluate the effectiveness of the layering technique to mask a discolored background (C4) after one year of water aging. The technique was used with three resin composite restorative systems (IPS Empress Direct, Charisma Diamond, and Filtek Z350XT). Ninety 1. Read More

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http://dx.doi.org/10.2341/18-016-LDOI Listing
January 2019

In Vitro Red Fluorescence as an Indicator of Caries Lesion Activity.

Oper Dent 2019 Jan 10. Epub 2019 Jan 10.

This in vitro study examined the utility of comparing red fluorescence between active and inactive caries lesions and investigated whether changes in red fluorescence and fluorescence loss are influenced by lesion activity following remineralization. Sixty-two noncavitated smooth surface caries lesions on extracted human teeth were classified into active or inactive lesions using the Nyvad system prior to a 12-day pH-cycling procedure. Quantitative light-induced fluorescence-digital images were used to measure fluorescence parameters before and after pH cycling. Read More

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http://www.jopdentonline.org/doi/10.2341/17-369-L
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http://dx.doi.org/10.2341/17-369-LDOI Listing
January 2019
3 Reads

Resin-Based Materials Protect Against Erosion/Abrasion-a Prolonged In Situ Study.

Oper Dent 2019 Jan 10. Epub 2019 Jan 10.

While patient compliance is key to preventive measures related to dental erosion, the application of resin-based materials could serve as an additional treatment to inhibit erosion progression. This in situ study evaluated the effect of applying resin-based materials, including resin infiltrant, on previously eroded enamel subjected to prolonged erosive and abrasive challenges. The factors under study were types of treatment (infiltrant [Icon], sealant [Helioseal Clear], adhesive [Adper Scotchbond Multi-Purpose Plus], and control [no treatment]); wear conditions (erosion [ERO] and erosion + abrasion [ERO + ABR]) and challenge time (5 and 20 days) in a single-phase study. Read More

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http://www.jopdentonline.org/doi/10.2341/17-198-L
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http://dx.doi.org/10.2341/17-198-LDOI Listing
January 2019
8 Reads

Clinical Evaluation of Two Different Prevention Programs in Adults Depending on Their Caries Risk Profile: One-year Results.

Oper Dent 2019 Mar/Apr;44(2):127-137. Epub 2018 Dec 5.

The aim of this study was to investigate the management of incipient caries lesions in adults with two preventive protocols. A total of 44 adult patients with high, moderate and low caries risk with 516 incipient caries took part in the study. These patients were assessed for caries with International Caries Detection and Assessment System (ICDAS) criteria and were then divided into three groups depending on their caries risk profile: a high-risk group (group A), a moderate-risk group (group B), and a low-risk group (group C). Read More

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http://www.jopdentonline.org/doi/10.2341/17-164-C
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http://dx.doi.org/10.2341/17-164-CDOI Listing
December 2018
2 Reads

Impact of Recently Developed Universal Adhesives on Tensile Bond Strength to Computer-Aided Design/Manufacturing Ceramics.

Oper Dent 2018 Dec 5. Epub 2018 Dec 5.

Objectives:: The aim of this investigation was to test the tensile bond strength (TBS) between different computer-aided-design/manufacturing (CAD/CAM) ceramics after conditioning using different universal adhesive systems and resin composite cement.

Methods And Materials:: Substrates of four CAD/CAM ceramics-1) VITABLOCS Mark II, 2) Initial LRF, 3) Celtra Duo, and 4) IPS e.max CAD (N=648, n=162)-were fabricated. Read More

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http://dx.doi.org/10.2341/18-017-LDOI Listing
December 2018
4 Reads

The Use of Different Photoinitiator Systems in Photopolymerizing Resin Cements Through Ceramic Veneers.

Oper Dent 2018 Dec 5. Epub 2018 Dec 5.

Objective:: To evaluate the effect of different photoinitiator systems on photopolymerizing resin cements through ceramic veneers with different thickness on microshear bond strength (μSBS), flexural strength (FS), and ultimate tensile strength (UTS) and verify the light attenuation through these ceramic veneers.

Methods And Materials:: Four photopolymerizing experimental resin cements were produced with the same resin matrix and associated with four different photoinitiator systems: camphorquinone (CQ), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), Ivocerin, and TPO + Ivocerin. Eighty disc-shaped ceramic veneers (IPS Empress Esthetic, Ivoclar Vivadent) were fabricated (10-mm diameter) in two different thicknesses: 0. Read More

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http://dx.doi.org/10.2341/17-263-LDOI Listing
December 2018
1 Read

A Simple Method for Treating Subgingival Class V Lesions.

Authors:
L Giachetti

Oper Dent 2018 Dec 5. Epub 2018 Dec 5.

Noncarious cervical lesions (NCCLs) are steadily increasing. Unfortunately, NCCL restorations represent one of the less durable types of restorations due to problems, including isolation and crevicular moisture control, especially in cases where the cervical margin is covered by soft tissue. This article presents a technique that allows us, through the use of a common metallic matrix, to isolate and make accessible class V cavities with intrasulcular cervical margins. Read More

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http://dx.doi.org/10.2341/18-141-TDOI Listing
December 2018
1 Read

Ferrule Design Does Not Affect the Biomechanical Behavior of Anterior Teeth Under Mechanical Fatigue: An In Vitro Evaluation.

Oper Dent 2018 Oct 10. Epub 2018 Oct 10.

Objectives:: To investigate the survival and failure mode of fiber-post resin restorations over preparations with different ferrule designs when submitted to a fatigue load test.

Methods And Materials:: Fifty bovine incisors were selected and divided into five groups (n=10) according to ferrule design: a no-ferrule group, a 2-mm circumferential ferrule group, a 2-mm buccal ferrule group, a 2-mm lingual ferrule group, and a 2-mm buccal and lingual ferrule group. The fiberglass post was cemented and the composite core was built up and prepared, followed by cementation of a full composite crown. Read More

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http://dx.doi.org/10.2341/17-296-LDOI Listing
October 2018
2 Reads

Is Optical Coherence Tomography a Potential Tool to Evaluate Marginal Adaptation of Class III/IV Composite Restorations In Vivo?

Oper Dent 2018 Oct 10. Epub 2018 Oct 10.

Objective:: Margin analysis of Class III and IV composite restorations in vitro and in vivo occurred by scanning electron microscopy (SEM) and optical coherence tomography (OCT). The results were compared and related to clinical evaluation.

Methods And Materials:: Eight Class III composite restorations were imaged in vitro using OCT and SEM. Read More

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http://dx.doi.org/10.2341/17-192-CDOI Listing
October 2018
2 Reads

Effectiveness of Dental Bleaching With 37.5% and 6% Hydrogen Peroxide and Its Effect on Quality of Life.

Oper Dent 2019 Mar/Apr;44(2):146-155. Epub 2018 Oct 10.

Objective:: This study investigated whether it is possible to achieve equally satisfactory results between 37.5% hydrogen peroxide (HP) gel and 6% HP gel. We also assessed the psychosocial impact and self-perception of esthetics generated by extracoronal tooth whitening. Read More

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http://dx.doi.org/10.2341/17-229-CDOI Listing
October 2018

Comparison of the Efficacy of Different Fluoride Varnishes on Dentin Remineralization During a Critical pH Exposure Using Quantitative X-Ray Microtomography.

Oper Dent 2018 Nov/Dec;43(6):E308-E316

Objectives:: The objective of this in vitro study was to quantify the amount of mineral change in demineralized dentin at pH 5.5 after the application of dental varnishes containing fluoride with casein phosphopeptide-amorphous calcium phosphate, fluoride and bioglass, or fluoride alone.

Methods And Materials:: A total of 12 extracted human sound mandibular premolar root samples were coated with an acid-resistant varnish, leaving a 2 × 3 mm window at the outer root surface. Read More

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http://dx.doi.org/10.2341/18-014-LDOI Listing
March 2019
31 Reads

Benefits of Nonthermal Atmospheric Plasma Treatment on Dentin Adhesion.

Oper Dent 2018 Nov/Dec;43(6):E288-E299

Objectives:: This study aimed to evaluate the influence of two nonthermal atmospheric plasma (NTAP) application times and two storage times on the microtensile bond strength (μTBS) to dentin. The influence of NTAP on the mechanical properties of the dentin-resin interface was studied by analyzing nanohardness (NH) and Young's modulus (YM). Water contact angles of pretreated dentin and hydroxyapatite blocks were also measured to assess possible alterations in the surface hydrophilicity upon NTAP. Read More

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http://www.jopdentonline.org/doi/10.2341/17-123-L
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http://dx.doi.org/10.2341/17-123-LDOI Listing
March 2019
12 Reads

Cuspal Flexure and Stress in Restored Teeth Caused by Amalgam Expansion.

Oper Dent 2018 Nov/Dec;43(6):E300-E307. Epub 2018 Oct 10.

Objective:: Cracks in amalgam-filled teeth may be related to amalgam expansion. This study measured cuspal flexure and used finite element analysis to assess associated stress levels in amalgam-filled teeth.

Methods And Materials:: External surfaces of 18 extracted molars were scanned in three dimensions. Read More

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http://dx.doi.org/10.2341/17-329-LDOI Listing

Faculty Posting.

Authors:

Oper Dent 2018 Nov/Dec;43(6):674

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http://dx.doi.org/10.2341/1559-2863-43.6.674DOI Listing
November 2018

Surface Sealant Effect on the Color Stability of a Composite Resin Following Ultraviolet Light Artificial Aging.

Oper Dent 2018 Nov 16. Epub 2018 Nov 16.

Objective:: To examine how exposure to accelerated artificial aging (AAA) stimuli (ultraviolet [UV] light) affects the color stability of a composite resin following surface sealant (SS) application.

Methods And Materials:: A total of 30 cylindrical composite resin (Esthet-X) discs were prepared using Teflon-coated rings. The treatment groups, defined by different SS (Seal-N-Sine, PermaSeal, OptiGuard, Biscover LV, and DuraFinish) use, were divided into five groups of six discs each. Read More

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http://dx.doi.org/10.2341/18-053-LDOI Listing
November 2018
1 Read

The Role of Occlusal Factors in the Presence of Noncarious Cervical Lesions in Young People: A Case-Control Study.

Oper Dent 2019 Jan/Feb;44(1):E12-E22. Epub 2018 Nov 16.

Objective:: The aim of this retrospective case-control study was to evaluate the influence of different occlusal characteristics and self-referred bruxism in the presence of noncarious cervical lesions (NCCLs).

Methods And Materials:: The participants were 280 students (140 cases and 140 controls), with an average age of 24.5 years, from six schools of dentistry in Spain. Read More

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http://dx.doi.org/10.2341/18-028-CDOI Listing
November 2018

Composite-composite Adhesion as a Function of Adhesive-composite Material and Surface Treatment.

Oper Dent 2018 Nov 16. Epub 2018 Nov 16.

Objective:: To evaluate the composite-to-composite repair interfacial fracture toughness (iFT) as a function of adhesive and composite repair material.

Methods And Materials:: Beam-shaped composite specimens (21×4×3±0.2 mm) were prepared for each substrate material (Filtek Supreme Ultra [FSU] or Clearfil Majesty ES-2 [CME]) and artificially aged for 50,000 thermocycles (5-55°C, 20-second dwell time). Read More

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http://www.jopdentonline.org/doi/10.2341/18-037-L
Publisher Site
http://dx.doi.org/10.2341/18-037-LDOI Listing
November 2018
17 Reads

Impact of Modifiable Risk Factors on Bone Loss During Periodontal Maintenance.

Oper Dent 2018 Nov 16. Epub 2018 Nov 16.

Objectives: The aim of this study was to analyze modifiable patient risk factors from dental chart histories and radiographs for progressive mild-moderate periodontitis during periodontal maintenance (PM).

Methods And Materials: Bitewing radiographs of 442 elderly periodontal maintenance patients were taken before and after two years of periodontal maintenance. Each progressive periodontitis (PP) patient (with at least one site of posterior interproximal bone loss of ≥2 mm, n=71) was matched to a periodontitis stable (PS) patient (no sites with bone loss, n=71) of the same gender and age (±five years) to control for these variables and was compared for measurements of general patient (medical history, smoking, hygiene and compliance habits) and tooth-related (bone loss, overhangs, interproximal dimensions) factors at baseline. Read More

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http://dx.doi.org/10.2341/18-041-CDOI Listing
November 2018