4,111 results match your criteria variance tukey

Dynamic navigation: a laboratory study on the accuracy and potential use of guided root canal treatment.

Int Endod J 2021 May 15. Epub 2021 May 15.

OMFS-IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.

Aim: To evaluate 3D accuracy and outcome of a dynamic navigation method for guided root canal treatment of severe pulp canal obliteration (PCO) in 3D printed jaws.

Methodology: Three operators with different levels of experience in Endodontics performed navigated access cavities, using the Navident system (ClaroNav, Toronto, Canada), in 2 sets (maxillary and mandibular) of 3D-printed jaw models with teeth presenting severe PCO. Models were mounted on a phantom to mimic a real clinical situation. Read More

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The effect of different micro-osteoperforation depths on the rate of orthodontic tooth movement: A single-center, single-blind, randomized clinical trial.

Korean J Orthod 2021 May;51(3):157-165

Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayıs University, Atakum, Samsun, Turkey.

Objective: This study aimed to identify the clinical effectiveness of two different penetration depths of micro-osteoperforations (MOPs) on the rate of orthodontic tooth movement.

Methods: Twenty-four patients requiring the removal of the upper first premolar teeth were selected and randomly divided into two groups. The control group participants did not undergo MOPs. Read More

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Application of an auto-edge counting method for quantification of metal artifacts in CBCT images: a multivariate analysis of object position, field of view size, tube voltage, and metal artifact reduction algorithm.

Oral Surg Oral Med Oral Pathol Oral Radiol 2021 Mar 28:4600. Epub 2021 Mar 28.

Dental Sciences Research Center, Department of Biostatistics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.

Objective: The objective was to assess the effects of object position, field of view (FOV) size, peak kilovoltage (kVp), and a metal artifact reduction (MAR) algorithm on metal artifacts in cone beam computed tomography (CBCT) as measured with an auto-edge counting method.

Study Design: A titanium implant and a stainless steel intracanal post in a root were inserted in bovine rib blocks. CBCT scans were acquired with changes in object position (incisor, canine, and premolar-molar areas), FOV, kVp, and MAR (on or off) mode. Read More

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Comparative Evaluation of Osteogenic Potential of Conventional Glass-ionomer Cement with Chitosan-modified Glass-ionomer and Bioactive Glass-modified Glass-ionomer Cement An Study.

Contemp Clin Dent 2021 Jan-Mar;12(1):32-36. Epub 2021 Mar 20.

Department of Conservative Dentistry and Endodontics, The Tamil Nadu Dr. M.G.R. Medical University, Chennai below Tamil Nadu Government Dental College and Hospital, Chennai, Tamil Nadu, India.

Aim: The aim of this study was to compare the osteogenic potential of conventional glass-ionomer cement (GIC) with chitosan-modified GIC (CH-GIC) and bioactive glass-modified GIC (BAG-GIC) as a function of time in varying proportions.

Materials And Methods: CH-GIC was prepared by adding 10 v/v% (Group II) and 50 v/v% (Group III) CH to the commercial liquid of GIC. BAG-GIC was prepared by the addition of 10 wt% (Group IV) and 30 wt% (Group V) of BAG to the GIC powder. Read More

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Game Spacing and Density in Relation to the Risk of Injuries in the National Hockey League.

Orthop J Sports Med 2021 Apr 19;9(4):2325967121999401. Epub 2021 Apr 19.

Department of Neurology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, New York, USA.

Background: Ice hockey has significant workload demands. Research of other sports has suggested that decreased rest between games as well as an increased workload may increase the risk of injuries.

Purpose: To evaluate whether condensed game schedules increase the frequency and severity of injuries in the National Hockey League (NHL). Read More

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Surface roughness of enamel and root surface after scaling, root planning and polishing procedures: An in-vitro study.

J Oral Biol Craniofac Res 2021 Apr-Jun;11(2):287-290. Epub 2021 Feb 27.

Pre-Doctoral Clinics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA.

Objectives: The aim of this study was to evaluate enamel and root surface roughness on exracted human teeth by using different tecniques (ultrasonic scaler, hand instruments, polishing paste, pumice and air powder system).

Materials And Methods: A total of 200 samples were divided into two groups (enamel and root) randomly with 100 samples for each enamel and root groups. The groups were divided into 5 subgroups: Group I: ultrasonic scaler, group II: hand instruments, group III: polishing paste, group IV: pumice, group V: air-powder. Read More

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February 2021

Effects of Forming Parameters on Fatigue Life in Incremental Sheet Punching.

Materials (Basel) 2021 Apr 29;14(9). Epub 2021 Apr 29.

School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266525, China.

In order to investigate the effects of main forming parameters on the fatigue life in incremental sheet punching, wavelength and amplitude were selected as factors, and fatigue life of truncated pyramids and virgin material was selected as indicator. The effects of the parameters were identified whereby the design of full factorial experiment, fatigue comparative test, analysis of variance, Tukey test, and -test. It was found that wavelength and amplitude significantly affect the fatigue life. Read More

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Temperature increases in primary teeth pulp chamber during polymerization of glass ionomer-based restorative materials.

Eur Oral Res 2021 Jan;55(1):28-33

Department of Pediatric Dentistry, Faculty of Dentistry,Sivas Cumhuriyet University, Sivas,Turkey.

Purpose: To evaluate the temperature changes in primary teeth pulp chambers of different dentin thicknesses during polymerization of four glass ionomer-based restorative materials.

Materials And Methods: Eighty extracted, caries‑free, primary molars were prepared as standardized Class I occlusal cavities with dentin thicknesses of 1 mm and 2 mm. Four glass ionomerbased restorative materials, Dyract XP, Photac Fil Quick Aplicap, Fuji II LC, and GCP Glass Fill, were placed in the cavities and cured with two light-curing units. Read More

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January 2021

Effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments.

J Prosthet Dent 2021 May;125(5):804.e1-804.e6

Lecturer, Department of Fixed Prosthodontics, College of Dentistry, University of Tanta, Tanta, Egypt.

Statement Of Problem: Agreement on the perfect virtual cement space value for computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported resin-ceramic crowns with the best marginal adaptation is lacking. The range of cement gap settings in some CAD design software programs is wide (0 to 200 μm), and manufacturer recommendations regarding the best cement gap setting for certain types of ceramics is not specific.

Purpose: The purpose of this in vitro study was to evaluate the effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments. Read More

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ISO 4049 versus NIST 4877: Influence of stress configuration on the outcome of a three-point bending test in resin-based dental materials and interrelation between standards.

Nicoleta Ilie

J Dent 2021 Apr 30;110:103682. Epub 2021 Apr 30.

Department of Conservative Dentistry and Periodontology, University Hospital, LMU Munich, Goethestr. 70, D-80336, Munich, Germany. Electronic address:

Objectives: The study aimed to find a relationship between the most common standards used in testing resin-based materials (RBC) in a three-point bend test - ISO 4049 and NIST 4877 - using a size-strength relationship defined by the Weibull model. The direct comparison of calculated and measured data is used for validation.

Methods: 280 (n = 20) specimens were prepared from seven different light-cured RBCs. Read More

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Statistical Evaluation of the Material-Source Effects on the DSR Rheological Properties of Plant-Mix Extracted Asphalt-Binders.

Materials (Basel) 2021 Apr 13;14(8). Epub 2021 Apr 13.

Department of Civil and Environmental Engineering, University of Texas at San Antonio, San Antonio, TX 78249, USA.

The work presented in this paper was carried out to statistically evaluate and quantify the material-source effect on the asphalt-binder's rheological properties using Analysis of Variance (ANOVA) and Tukey's Honestly Significant Difference (Tukey´s HSD) test. The study focused on the Asphalt-Binders' high-temperature rheological properties, namely, the G*, δ, G*/Sin(δ) and G*/(1 - (1/Tan(δ)Sin(δ))) parameters, measured using the Dynamic Shear Rheometer (DSR) device. The DSR data analyzed in the study were extracted from the Texas flexible pavements and overlays database, namely, the Texas Data Storage System (DSS), covering two Asphalt-Binders (ABs), performance grade (PG) 64-22 and PG 76-22 plant-mix extracted ABs that were treated as rolling thin film oven (RTFO) residue, and sourced from 14 different suppliers. Read More

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Family Social Capital: Links to Weight-Related and Parenting Behaviors of Mothers with Young Children.

Nutrients 2021 Apr 23;13(5). Epub 2021 Apr 23.

Nutritional Sciences Department, Rutgers University, New Brunswick, NJ 08901, USA.

Family social capital includes the social relationships, values, and norms shared by a family and is positively linked with children's mental and physical health status. This cross-sectional study addresses a gap in the literature related to family social capital vis-à-vis weight-related behaviors and home environments of 557 mothers and their young children (ages 2 to 9 years). Mothers completed an online survey comprised of valid, reliable questionnaires assessing family relationships and weight-related behavioral and home environment measures. Read More

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Influences of desensitizing agents on bond strength of etch-and-rinse and self-etch adhesive system to dentin.

J Conserv Dent 2020 Sep-Oct;23(5):522-527. Epub 2021 Feb 10.

Department of Conservative Dentistry and Endodontics, CSI College of Dental Sciences, Madurai, Tamil Nadu, India.

Background: Cervical lesions requiring adhesive restoration may present with dentin hypersensitivity, but the effect of desensitizer treatment on microtensile bond strength (MBS) is inconclusive.

Aim: The aim of the present study was to assess the influence of two types of dentin desensitizing treatment on bond strength to dentin.

Materials And Methods: Thirty-six extracted human mandibular first premolars were used to obtain superficial buccal cervical dentin. Read More

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February 2021

Fracture Resistance of Zirconia, Polyetheretherketone, and Polyetherketoneketone Implant Abutments After Aging.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):332-340

Purpose: This study aimed to assess the fracture resistance of zirconia (Zr), reinforced polyetheretherketone (PEEK), and polyetherketoneketone (PEKK) implant abutments restored with glass-ceramic crowns after thermomechanical aging.

Materials And Methods: Zr, reinforced PEEK, and PEKK titanium base abutments were divided into three groups (n = 10). CAD/CAM maxillary central incisor crowns were fabricated using monolithic lithium disilicate and luted to the abutments using resin cement. Read More

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Use of Acid for Oxide Layer Removal of Overcast UCLA Abutments: Influence on Fit and Roughness.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):289-294

Purpose: The objective of this study was to evaluate the influence of the oxide layer removal procedure using acid on the roughness and internal fit of overcast universal castable long abutments (UCLAs) for a taper connection.

Materials And Methods: For this, maxillary first premolars were waxed on the plastic sleeve of 15 UCLAs with a premachined interface. The specimens were overcast using the NiCr alloy, and the frameworks were randomly distributed to undergo one of two different oxide layer removal methods: blasting with 100-μm particles of aluminum oxide at 0. Read More

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Impact of photobiomodulation and low-intensity pulsed ultrasound adjunctive interventions on orthodontic treatment duration during clear aligner therapy: A retrospective study.

Angle Orthod 2021 Apr 28. Epub 2021 Apr 28.

Objective: To assess the efficiency of low-intensity pulsed ultrasound (LIPUS) and photobiomodulation (PBM) interventions in accelerating orthodontic tooth movement during clear aligner therapy (CAT).

Materials And Methods: This retrospective study was carried out on the records of 84 subjects who were treated using CAT. Twenty-eight patients were treated using CAT with a daily use of LIPUS for 20 minutes, 28 patients were treated using CAT with a daily use of PBM for 10 minutes, and 28 patients were treated using CAT alone. Read More

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Acute dental pain elevates salivary oxytocin in women: a risk factor during pregnancy.

Gen Dent 2021 May-Jun;69(3):73-77

Irreversible pulpitis is an acute, brief, and painful condition. Oxytocin, cortisol, and secretory immunoglobulin A (sIgA) are released by the body in response to pain and emotional stress. The aim of this study was to investigate the expression of salivary cortisol, sIgA, and oxytocin among patients with irreversible pulpitis. Read More

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Customized fiber posts in root canals prepared with and without laser application: a pull-out evaluation.

Gen Dent 2021 May-Jun;69(3):52-56

This study evaluated the effect of fiber post customization and laser application on the results of pull-out tests in endodontically treated teeth. Forty-eight bovine incisors were stored in aqueous 2% formaldehyde (pH 7.0) for 30 days. Read More

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Influence of thermocycling and disinfection on the color stability and hardness of thermoplastic sheets used for occlusal splint fabrication.

Gen Dent 2021 May-Jun;69(3):42-45

The aim of this study was to compare PETG/TPU (polyethylene terephthalate glycol/thermoplastic polyurethane) with PETG (polyethylene terephthalate glycol), based on color stability and microhardness. Sixty circular specimens (10 mm in diameter × 3 mm thick) were fabricated (30 PETG/TPU and 30 PETG). The specimens in both groups were submitted to 2000 thermal cycles in alternating baths of 60 seconds at 5°C ± 1°C and 55°C ± 1°C. Read More

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Influence of dentin presealing on the fracture strength of endodontically treated maxillary premolars.

Gen Dent 2021 May-Jun;69(3):37-41

This in vitro study aimed to evaluate the influence of endodontic irrigation solutions and resin sealing of the dentin surfaces of the cavity before irrigation on the fracture strength (FS) of maxillary premolars. Seventy-two human maxillary premolars were randomly assigned to 6 groups (n = 12). Group 1 consisted of intact teeth that served as negative controls. Read More

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Failure load and shear bond strength of indirect materials bonded to enamel after aging.

Gen Dent 2021 May-Jun;69(3):24-29

This study evaluated the failure load and the shear bond strength of 4 block materials indicated for computer-aided design/computer-aided manufacturing (CAD/CAM) of dental veneers: lithium disilicate, feldspathic ceramic, polymer-infiltrated ceramic, and nanohybrid composite. The tested hypothesis was that the material that combined an elastic modulus similar to that of enamel with the highest bond strength values would present the highest failure load. From prefabricated CAD/CAM blocks, disc-shaped specimens (6. Read More

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Push out bond strength of glass fiber post to radicular dentin irrigated with Nisin and MTAD compared to methylene blue photodynamic therapy.

Photodiagnosis Photodyn Ther 2021 Apr 24;34:102304. Epub 2021 Apr 24.

Restorative Dental Sciences Department, College of Dentistry, King Saud University, Saudi Arabia. Electronic address:

Aim: Present lab-based study intended to appraise the effect of nisin, Mixture of Tetracycline, Acid and Detergent (MTAD), and photodynamic therapy (PDT) when used as a canal disinfectant on push-out bond strength (PBS) of fiber post to radicular dentin MATERIALS AND METHODS: Forty uni-radicular premolar teeth were extracted and disinfected in 0.5 % thymol solution. All specimens were decoronated to achieve standardize root length of 14 mm. Read More

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The Transverse Process Trajectory Technique: An Alternative for Thoracic Pedicle Screw Implantation-Radiographic and Biomechanical Analysis.

Int J Spine Surg 2021 Apr 1;15(2):315-323. Epub 2021 Apr 1.

University of Toledo, Toledo, Ohio.

Background: This study evaluates the accuracy, biomechanical profile, and learning curve of the transverse process trajectory technique (TPT) compared to the straightforward (SF) and in-out-in (IOI) techniques. SF and IOI have been used for fixation in the thoracic spine. Although widely used, there are associated learning curves and symptomatic pedicular breaches. Read More

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Quantitative 3D Ultrashort Echo Time Magnetization Transfer Imaging for Evaluation of Knee Cartilage Degeneration In Vivo.

J Magn Reson Imaging 2021 Apr 24. Epub 2021 Apr 24.

Department of Radiology, University of California San Diego, La Jolla, California, USA.

Background: Recent studies suggest that macromolecular fraction (MMF) derived from three-dimensional ultrashort echo time magnetization transfer (UTE-MT) imaging is insensitive to the magic angle effect. However, its clinical use in osteoarthritis (OA) remains to be investigated.

Purpose: To investigate the feasibility of 3D UTE-MT-derived MMF in differentiating normal from degenerated cartilage. Read More

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Comparative Evaluation of the Efficacy of Novel Root Canal Irrigation Techniques on Reduction of Count: An Study.

J Contemp Dent Pract 2020 Dec 1;21(12):1379-1383. Epub 2020 Dec 1.

Department of Conservative Dentistry and Endodontics, Adhiprasakthi Dental College and Hospital, Tamil Nadu Dr. MGR Medical University, Melmaruvathur, Tamil Nadu, India, Phone: +91 9444792260, e-mail:

Aim And Objective: To compare the effectiveness of three irrigation systems, namely, Endovac system, Max I probe, and Navitip FX, in reduction of population from the root canal using agar diffusion method.

Materials And Methods: Sixty extracted intact human permanent maxillary anterior teeth were selected for this study. In group I, root canals were irrigated using brush covered 30-gauge NaviTipFX. Read More

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December 2020

The effect of reduced glutathione on the toxicity of silver diamine fluoride in rat pulpal cells.

J Appl Oral Sci 2021 19;29:e20200859. Epub 2021 Apr 19.

Tokyo Medical and Dental University, Graduate School of Medical and Dental Sciences, Department of Cariology and Operative Dentistry, Tokyo, Japan.

Introduction: Due to its ability to arrest untreated dental caries, silver diamine fluoride (SDF) has been advocated for indirect pulp capping procedures. However, the high concentrations of silver and fluoride in SDF raise concerns about its biocompatibility to pulpal tissues.

Objectives: This study aimed to investigate the effect of SDF on the viability, alkaline phosphatase (ALP) activity, and morphology of pulpal-like cells (RPC-C2A) and to evaluate the influence of reduced glutathione (GSH) on SDF-induced cytotoxicity and deposit formation on dentin. Read More

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Effect of Different Light-Curing Modes on Bond Strength of Ceramic Laminate Veneers.

Int J Prosthodont 2021 Mar-Apr;34(2):221-228

Purpose: To investigate whether high-level irradiance and short light exposure times with light-emitting diode (LED) curing units could provide bond strength comparable to halogen lights for ceramic laminate veneers (CLVs).

Materials And Methods: A total of 160 extracted human maxillary central incisors were prepared to receive CLVs (lithium disilicate) in shades A1 and A3.5. Read More

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The Evaluation of Different Treatments of Incipient Caries Lesions: An in Situ Study of Progression Using Fluorescence-based Methods.

Oper Dent 2021 Jan;46(1):87-99

Clinical Relevance: Effective methods to control incipient caries lesions are needed. In this investigation, several methods provide encouraging results.

Summary: This study aimed to evaluate in situ the inhibition of incipient caries lesion progression using different treatment protocols and to evaluate the effectiveness of fluorescence-based methods (DIAGNOdent, DIAGNOdent pen, and VistaProof fluorescence camera [FC]) in monitoring this process. Read More

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January 2021