4,815 results match your criteria ceramic restorations

Effects of occlusal splint therapy on opposing tooth tissues, filling materials and restorations.

J Oral Rehabil 2021 Jul 28. Epub 2021 Jul 28.

Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.

Background: Little is known about the effect of the type of splint material, Heat-Cured PMMA (HC) or Chemical-Cured PMMA (CC) on the wear of opposing tooth surfaces.

Objective: The aim of this in-vitro study was to evaluate two-body wear of dentin, enamel, glass-ceramic or one of four resin composites when opposing splint materials, namely ProBase HC and CC.

Methods: The two-body wear of bovine dentine, bovine enamel, glass-ceramic IPS e. Read More

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Comparison of posterior indirect adhesive restorations (PIAR) with different preparations designs according to the adhesthetics classification.

Int J Esthet Dent 2021 Aug;16(3):262-279

Aim: To investigate whether different restoration designs, overlay types, and full crowns in posterior teeth have similarly acceptable marginal sealing and quality.

Materials And Methods: For Part 1 of the present study (investigation of fracture resistance), 70 extracted molars were divided into five groups (N = 14), prepared with four different posterior indirect adhesive restoration (PIAR) overlay design types, according to the adhesthetics classification. The groups were: 1. Read More

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[How successful can discolored teeth be esthetically restored with monolithic restorative materials - a case report].

Swiss Dent J 2021 Jul;131(7-8):595-600

Poliklinik für Zahnärztliche Prothetik und Werkstoffkunde, Universitätsklinikum Leipzig, Deutschland.

The discoloration of enamel and dentin often has a lasting negative impact on the esthetic appearance. The current clinical case report illustrates which results can be achieved by supplying a patient with restorations fabricated from translucent tooth-colored materials for a traumatically damaged and discolored anterior tooth. A 20-year-old patient sought dental care due to a severe discrepancy in color and shape of tooth 11. Read More

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Technical and Biological Complications of Screw-Retained (CAD/CAM) Monolithic and Partial Veneer Zirconia for Fixed Dental Prostheses on Posterior Implants Using a Digital Workflow: A 3-Year Cross-Sectional Retrospective Study.

Biomed Res Int 2021 6;2021:5581435. Epub 2021 Jul 6.

Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS-Università Cattolica del Sacro Cuore, Rome, Italy.

Objective: The introduction of CAD/CAM and the development of zirconia-based restorations have allowed clinicians to use less expensive materials and faster manufacturing procedures. The purpose of the study was to analyze the differences, in terms of mechanical and biological complication, in multiunit zirconia fixed dental prosthesis (FPDs) on posterior implants produced using a digital workflow. . Read More

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Comparison of translucency and opalescence among different dental monolithic ceramics.

J Prosthet Dent 2021 Jul 22. Epub 2021 Jul 22.

Professor of Prosthodontics, Department of Prosthodontics, Faculty of Dentistry, University of Istanbul, Istanbul, Turkey.

Statement Of Problem: Monolithic ceramic restorations designed by computer-aided design and computer-aided manufacturing are increasingly being used by clinicians. With the introduction of new materials, their optical characteristics also need to be investigated.

Purpose: The purpose of this in vitro study was to compare the translucency and opalescence of lithium disilicate, zirconia-reinforced lithium silicate, presintered zirconia-reinforced lithium silicate, polymer-infiltrated ceramic-network material, and multilayer zirconia. Read More

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Analysis of the Surface Condition and Changes in Crystallographic Structure of Zirconium Oxide Affected by Mechanical Processing.

Materials (Basel) 2021 Jul 20;14(14). Epub 2021 Jul 20.

Department of Endodontics, Chair of Conservative Dentistry and Endodontics, Medical University of Lodz, 251 Pomorska Str., 92-213 Łódź, Poland.

Zirconium oxide is a material commonly used in dental prosthetics for making cups of permanent prosthetic restorations. In order to properly prepare the surface of zirconium oxide for prosthetic treatment, it must be veneered with ceramics. The quality of cup-veneered ceramics is dependent on many factors, including the surface free energy (SFE) and transformation of zirconium oxide. Read More

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An Ultrastructural Study on the Effect of High Temperatures on Teeth and Restorative Materials That Aids in the Identification of Human Remains.

Biomed Res Int 2021 1;2021:6629560. Epub 2021 Jul 1.

Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Saudi Arabia.

Introduction: In most disasters, teeth are the only means of positive identification of an otherwise unrecognizable body, as there has been tremendous increase in the use of dental restorations that have different resistance to prolonged high temperature which is an important aid in identifying burned victims. Application of SEM/EDS in forensics was found useful in areas where there is a need for good imaging with high magnification combined with elemental analysis. The objective of this study was to analyze incineration effects on teeth and restorative materials using SEM/EDS. Read More

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[Conservative and simple rehabilitation to compensate posterior open bite: partial bonded restauration].

Orthod Fr 2021 Jun;92(2):181-194

Centre Hospitalier Universitaire de Nice, Pôle Odontologie, 4 avenue Reine Victoria, 06000 Nice, France, Université Côte d'Azur, UFR Odontologie, 24 avenue des Diables Bleus, 06357 Nice Cedex 04, France, MICORALIS EA 7354, Université Côte d'Azur, 24 avenue des Diables Bleus, 06357 Nice cedex 04, France.

Posterior open bite is a malocclusion characterized by the absence of vertical contacts between the occlusal surfaces of the posterior teeth of the opposing arches. It can be uni- or bilateral and involve one tooth or more. Several aetiologies of these posterior open bite have been described, including pathological eruptions, dento-maxillary dysmorphosis and temporo-mandibular dysfunctions. Read More

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The Effect of Dentin Bonding and Material Thickness on the Flexural Properties of a Lithium-Disilicate Glass-Ceramic.

J Adhes Dent 2021 Jul;23(4):309-318

Purpose: Thanks to adhesive techniques and strengthened glass ceramics, ultrathin bonded occlusal veneers have been recently introduced. However, since a universally accepted thickness limit for ultrathin ceramics has yet to be established, their resistance to fracture needs to be better investigated. The purpose of this in vitro study was to evaluate the effect of dentin bonding on the flexural properties (ie, fracture load and flexural strength) of a lithium-disilicate (LD) glass ceramic when used in thicknesses equal to or less than the manufacturer's recommendations for occlusal restorations. Read More

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Characterization of the Interface of Heat-pressed Glass-Ceramic Masses on Metal Support Cr-Co in Metal-Ceramic Prosthetic Restorations.

J Contemp Dent Pract 2021 Apr 1;22(4):335-341. Epub 2021 Apr 1.

Department of Prosthodontics, National and Kapodistrian University of Athens, Athens, Greece.

Aim And Objective: The aim and objective of this study is to evaluate the interface between heat-pressed glass-ceramic masses on a Cr-Co metal substrate using a scanning electron microscope and an X-ray energy dispersion spectrometer.

Materials And Methods: A pressed porcelain-leucite-based ceramic (IPS InLine press-on-metal (PoM); Ivoclar Vivadent AG) was used. Three cylindrical metal specimens cast (diameter 5 mm, height 1. Read More

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Establishment of optimal variable elastic modulus distribution in the design of full-crown restorations by finite element analysis.

Dent Mater J 2021 Jul 13. Epub 2021 Jul 13.

Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University.

To establish optimal elastic modulus distribution throughout the entire all-ceramic crown, aiming at improvement of the mechanical properties of the restoration as well as the adhesive interface, seven 3D models of mandibular first premolars of zirconia monolithic and bilayer crowns and lithium disilicate monolithic and bilayer crowns were constructed. The elastic modulus distribution of 8-layer crown A referred to human enamel, B was calculated by a genetic algorithm (GA) to minimize the principle stresses on the crown, and C minimized the shear stresses at the cementing lines. After applying a static load of 600 N, the maximum principle stresses were calculated and analyzed by finite element analysis (FEA). Read More

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Silane Heat Treatment Could Eliminate the Hydrofluoric Acid Etching of Lithium Disilicate Overlays: A Four-Year Follow-Up.

Case Rep Dent 2021 22;2021:9961621. Epub 2021 Jun 22.

Department of Conservative Dentistry, Faculty of Dental Medicine, Medical University of Sofia, Georgi Sofiiski 3 Str., Sofia, Bulgaria.

A four-year follow-up of a novel silane heat treatment method for bonding lithium disilicate overlays to tooth structures without hydrofluoric acid etching of the ceramic surface is presented in this case report. Silane heat treatment modifies the silane layer and thus enhances resin ceramic bond strength without hydrofluoric acid etching. The standard ceramic preparation technique prior to bonding silicate ceramics to tooth structure is hydrofluoric acid etching and applying a silane coupling agent, followed by dental adhesive. Read More

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Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations.

Binting Xu

J Esthet Restor Dent 2021 Jul 13. Epub 2021 Jul 13.

Attending Physician, College of Stomatology, Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China.

Objective: To investigate the effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations.

Materials And Methods: Eighty specimens (shade A2 and A3, n = 10) (20 mm in length, 4 mm in width, 1.5 mm in thickness respectively) of casting ceramic (EM); alumina ceramic (AL); zirconia ceramic (ZR); and porcelain-fused-metal (PFM) were prepared. Read More

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Fatigue Behavior of Monolithic Zirconia-Reinforced Lithium Silicate Ceramic Restorations: Effects of Conditionings of the Intaglio Surface and the Resin Cements.

Oper Dent 2021 Jul 11. Epub 2021 Jul 11.

Objective: This study assessed the effect of conditioning of the intaglio surface and resin cements on the fatigue behavior of zirconia-reinforced lithium silicate ceramic (ZLS) restorations cemented to a dentin analogue.

Methods: ZLS ceramic (Ø=10 mm, thickness=1.5 mm) and dentin analogue (Ø=10 mm, thickness=2. Read More

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Influence of the ceramic translucency on the relative degree of conversion of a direct composite and dual-curing resin cement through lithium disilicate onlays and endocrowns.

J Mech Behav Biomed Mater 2021 Jun 29;122:104662. Epub 2021 Jun 29.

The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Restorative Dentistry and Biomaterials, Groningen, the Netherlands; Martini Hospital, Department of Special Dental Care, Groningen, the Netherlands.

Introduction: The goal of this study was to investigate the influence of the ceramic translucency, restoration type and polymerization time on the relative degree of conversion of a dual-curing resin cement and a conventional microhybrid resin composite using a high-power light-curing device.

Methods And Materials: Two 4.0 mm thick onlay (O) and two 7. Read More

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A multi-modal delivery strategy for spinal cord regeneration using a composite hydrogel presenting biophysical and biochemical cues synergistically.

Biomaterials 2021 Jul 3;276:120971. Epub 2021 Jul 3.

State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China. Electronic address:

Extensive tissue engineering studies have supported the enhanced spinal cord regeneration by implantable scaffolds loaded with bioactive cues. However, scaffolds with single-cue delivery showed unsatisfactory effects, most likely due to the complex nature of hostile niches in the lesion area. In this regard, strategies of multi-modal delivery of multiple heterogeneous cell-regulatory cues are unmet needs for enhancing spinal cord repair, which requires a thorough understanding of the regenerative niche associated with spinal cord injury. Read More

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In-vivo-wear in composite and ceramic full mouth rehabilitations over 3 years.

Sci Rep 2021 Jul 7;11(1):14056. Epub 2021 Jul 7.

Department of Prosthodontics, Goethe University, Center for Dentistry and Oral Medicine (Carolinum), Theodor-Stern-Kai 7, 60596, Frankfurt am Main, Germany.

The aim of this study was to quantify and to compare the wear rates of premolar (PM) and molar (M) restorations of lithium disilicate ceramic (LS2) and an experimental CAD/CAM polymer (COMP) in cases of complex rehabilitations with changes in vertical dimension of occlusion (VDO). Twelve patients with severe tooth wear underwent prosthetic rehabilitation, restoring the VDO with antagonistic occlusal coverage restorations either out of LS2 (n = 6 patients, n = 16 posterior restorations/patient; N = 96 restorations/year) or COMP (n = 6 patients; n = 16 posterior restorations/patient; N = 96 restorations/year). Data was obtained by digitalization of plaster casts with a laboratory scanner at annual recalls (350 ± 86 days; 755 ± 92 days; 1102 ± 97 days). Read More

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An Evaluation to Compare the Surface Roughness of Glazed, Reglazed and Chair Side Polished Surfaces of Dental Porcelain.

Contemp Clin Dent 2021 Apr-Jun;12(2):164-168. Epub 2021 Jun 14.

Department of Prosthodontics and Crown and Bridge, Maharishi Markadeshwar College of Dental Science and Research, Mullana, Ambala, Haryana, India.

Aim: The aim of this study was to evaluate the effect of glazing, reglazing, and chairside polishing on the surface roughness of dental porcelain.

Materials And Methods: A total of 50 discs of feldspathic porcelain were fabricated using a metal mold of dimension 10 mm × 2 mm. Based on the surface treatment, the samples were divided into five groups. Read More

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The relation between impact strength and flexural strength of dental materials.

J Mech Behav Biomed Mater 2021 Jun 29;122:104658. Epub 2021 Jun 29.

Dept. of Dental Material Sciences, Academic Centre for Dentistry Amsterdam (ACTA), Gustav Mahlerlaan 3004, 1081, LA, Amsterdam, the Netherlands.

Aim: The aim of this study was to investigate whether there is a relation between impact strength and flexural strength of different composite and ceramic materials used in dental restorations.

Materials And Methods: The three-point-bending test was used to determine the flexural strength and flexural modulus, and the Dynstat impact test was used to determine the impact strength of different composite and ceramic dental materials. The relation between the flexural strength and impact strength was mathematically investigated and a three-dimensional finite element analysis model of the impact test set-up was created to verify these results. Read More

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Comparison of Mechanical Properties of Chairside CAD/CAM Restorations Fabricated Using a Standardization Method.

Materials (Basel) 2021 Jun 6;14(11). Epub 2021 Jun 6.

Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Korea.

The aim of this in vitro study was to investigate the fracture resistance, fracture failure pattern, and fractography of four types of chairside computer-aided design/computer-aided manufacturing (CAD/CAM) restoration materials in teeth and titanium abutments fabricated using a standardization method. An artificial mandibular left first premolar prepared for all-ceramic crown restoration was scanned. Forty extracted mandibular molars and cylindrical titanium specimens were milled into a standardized shape. Read More

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Resistance to Fracture of Lithium Disilicate Feldspathic Restorations Manufactured Using a CAD/CAM System and Crystallized with Different Thermal Units and Programs.

Materials (Basel) 2021 Jun 10;14(12). Epub 2021 Jun 10.

Faculty of Dentistry, Universidad de Santiago de Compostela, 15782 Galicia, Spain.

The aim of this study was to determine the resistance to fracture of feldspathic restorations with lithium disilicate and crystallized with different ovens and programs.

Methods: Sixty monolithic restorations (LD) (EMAX CAD™ LT, Ivoclar-Vivadent™) were designed with the same parameters and milled with a CAD/CAM system (CEREC SW 5.1, CEREC MCXL, Dentsply-Sirona™, Bensheim). Read More

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Hydrothermal Ageing and Its Effect on Fracture Load of Zirconia Dental Implants.

Materials (Basel) 2021 Jun 5;14(11). Epub 2021 Jun 5.

Straumann AG, PeterMerian Weg 12, 4052 Basel, Switzerland.

Due to growing demand for metal-free dental restorations, dental ceramics, especially dental zirconia, represent an increasing share of the dental implants market. They may offer mechanical performances of the same range as titanium ones. However, their use is still restricted by a lack of confidence in their durability and, in particular, in their ability to resist hydrothermal ageing. Read More

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The One-Year In Vivo Comparison of Lithium Disilicate and Zirconium Dioxide Inlays.

Materials (Basel) 2021 Jun 5;14(11). Epub 2021 Jun 5.

Department of General Dentistry, Medical University of Lodz, 251 Pomorska St, 92-213 Lodz, Poland.

The objective of the present study was to evaluate the one-year clinical performance of lithium disilicate (LD) and zirconium dioxide (ZrO) class II inlay restorations. Thirty healthy individuals who met the inclusion criteria were enrolled for the study. The patients were randomly divided into two study groups ( = 15): LD (IPS e. Read More

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Comparison of Fracture Strengths among different Commonly Placed Anterior Esthetic Restorations for Primary Dentition: An in vitro study.

J Clin Pediatr Dent 2021 Jul;45(3):171-176

The purpose of this study was to determine and compare the shear force (N) required to fracture or dislodge an all-ceramic zirconia-based crown using different luting cement with those of polycarbonate crown and strip crown for the primary anterior teeth in vitro.

Study Design: Four groups of esthetic restoration for primary anterior teeth were tested for fracture strength: 1) Fifteen all-ceramic zirconia-based crowns cemented with glass ionomer cement, 2) Fifteen all-ceramic zirconia-based crowns bonded with a self-adhesive resin cement, 3) Fifteen polycarbonate crowns cemented with a polymer reinforced zinc-oxide eugenol and 4) Fifteen resin strip crowns. All restorations were placed and cemented on reproductions of dies in an independent laboratory at Delhi, India. Read More

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Influence of Preparation Design and Restorative Material on Fatigue and Fracture Strength of Restored Maxillary Premolars.

Oper Dent 2021 Jun 30. Epub 2021 Jun 30.

Statement Of Problem: Extensive carious lesions and/or large preexisting restorations possibly contribute to crack formation, ultimately resulting in a fracture that may lead to the loss of a tooth cusp. Hence, preparation design strategy in conjunction with the restorative material selected could be influential in the occurrence of a cuspal fracture.

Purpose: The purpose of this in vitro study was to evaluate the fatigue behavior and fracture strength of maxillary premolars restored with direct composite and indirect ceramic inlays and overlays, with different preparation depths in the presence or absence of cuspal coverage, and analyze their failure types. Read More

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Evaluation of Polishing Systems for CAD/CAM Polymer-Infiltrated Ceramic-Network Restorations.

Oper Dent 2021 Jun 30. Epub 2021 Jun 30.

Objective: The purpose of this study was to evaluate the effectiveness of five different polishing systems on a computer-aided design and computer-aided manufacturing (CAD/CAM) polymer-infiltrated ceramic-network restoration with nanoscale assessment using atomic force microscopy (AFM) and visual assessment performed by dental school senior students and faculty members.

Method: Forty-eight full coverage crowns were milled out of polymer-infiltrated ceramic-network CAD/CAM blocks (Vita Enamic) for polishing with one company proprietary, two ceramic and two composite polishing systems. The prepared crowns were divided into six groups: (1) no polishing (control); (2) polishing with Vita Enamic Polishing Kit (VEna); (3) polishing with Shofu Porcelain Laminate Polishing Kit (SCer); (4) polishing with Brasseler Dialite Feather lite All- Ceramic Adjusting & Polishing System (BCer); (5) polishing with Shofu Composite Polishing Kit (SCom); and (6) polishing with Brasseler Composite Polishing Kit (BCom). Read More

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Marginal adaptation of three-unit interim restorations fabricated by the CAD-CA systems and the direct method before and after thermocycling.

J Clin Exp Dent 2021 Jun 1;13(6):e572-e579. Epub 2021 Jun 1.

DDS, MSc, Assistant Professor, Dental Sciences Research Center, Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.

Background: Limited information is available regarding the marginal adaptation of three-unit interim restorations fabricated by different techniques from different materials. Also, the efficacy of computer-aided design/computer-aided manufacturing (CAD-CAM) systems for their fabrication is still questionable. This study aimed to assess the marginal adaptation of three-unit interim restorations fabricated by the CAD-CAM systems and the direct method from different materials before and after thermocycling. Read More

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An up to 43-year longitudinal study of fixed prosthetic restorations retained with 4-META/MMA-TBB resin cement or zinc phosphate cement.

J Prosthet Dent 2021 Jun 23. Epub 2021 Jun 23.

General Practitioner, Medical Corporation Shi-Sei-Kai Masaka Dental Clinic, Tokyo, Japan.

Statement Of Problem: Adhesive resin cement has been the preferred choice for the placement of prosthetic restorations, but evidence-based studies supporting this selection are sparse.

Purpose: The purpose of this study was to test the hypothesis that restoration placement with the adhesive 4-methacryloxyethyl trimellitate anhydride/methyl methacrylate-tributylborane (4-META/MMA-TBB) resin cement is associated with better longevity of teeth than zinc phosphate cement up to 43 years.

Materials And Methods: Study participants were individuals who had been visiting the clinic regularly for more than 20 years from their first visit between November 1970 and April 1985. Read More

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The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia.

Clin Exp Dent Res 2021 Jun 21. Epub 2021 Jun 21.

Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Objective: This study aimed to investigate the effects of bleaching on the color, translucency, surface roughness, and surface hardness of monolithic zirconia with external stainin .

Methods: In this experimental study, 32 specimens of monolithic zirconia (1 × 1 mm; shade A2) were divided into two groups based on random permuted blocks. Overglaze and staining procedures were performed with a yellow stain or a value stain (GC Stain). Read More

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Shear Bond Strength of Zirconia Ceramic to Four Different Core Materials, An Study.

J Dent (Shiraz) 2021 Jun;22(2):138-143

Post Graduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Statement Of The Problem: Different materials can be used to reconstruct the core foundation in all-ceramic restorations. Bond strength of the core material to zirconia is an important factor in long-term restoration success.

Purpose: The aim of this study was to assess shear bond strength (SBS) of zirconia to four different core materials. Read More

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