Monolithic Zirconia Partial Coverage Restorations: An In Vitro Mastication Simulation Study.

Purpose: To evaluate the survival rate (fatigue resistance), bonding efficiency and marginal integrity of monolithic zirconia partial and full coverage single restorations adhesively bonded to the tooth structure using air-particle abrasion, a primer with 10-methacryloyloxydecyl dihydrogen phosphate and a composite-resin cement (APC) protocol.

Materials And Methods: Extracted human premolars (N = 32) were randomly divided into four groups of eight specimens each. Premolars were prepared for the following restorations: full crown (group 1, control), mesial-occlusal-distal-facial onlay (MODF, group 2) preserving 2 mm facio-lingual functional cusp width, mesial-occlusal-distal-lingual onlay (MODL, group 3) preserving 2 mm facio-lingual nonfunctional cusp width, mesial-occlusal-distal-buccal-lingual onlay (MODBL, group 4), overlay preparation.

Tooth-cusp preservation with lithium disilicate onlay restorations: A fatigue resistance study.

Objectives: This study examined the in vitro fatigue resistance of maxillary premolars with 2 mm or 3 mm preserved cusp thicknesses restored with lithium disilicate onlays.

Materials And Methods: Premolars(N = 48) were divided into six groups. Onlays for groups 1 to 4 preserved a 3 mm functional (G1), 2 mm functional (G2), 3 mm nonfunctional (G3), or 2 mm nonfunctional (G4) buccal-lingual cusp width.

Three-year clinical evaluation of universal adhesives in non-carious cervical lesions.

Purpose: To compare the performance of universal adhesives containing different monomers, namely 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) and dipentaerythritol penta-acrylate monophosphate (PENTA), in the restoration of non-carious cervical lesions (NCCLs).

Methods: This was a randomized controlled clinical trial involving 63 subjects in need of restorations of 203 NCCLs. Notch-shaped lesions were restored with Kalore (GC Corporation) after application of Scotchbond Universal (SU) or Prime&Bond Elect (PBE) following the etch-and-rinse (ER) or self-etch (SE) technique.

Fracture load of two thicknesses of different zirconia types after fatiguing and thermocycling.

Statement Of Problem: A direct relationship has been reported between yttria concentration and translucency in zirconia restorations. However, increased yttria concentration also increases the cubic phase of the zirconia, which reduces its strength. The effect of increased yttria content on the fracture resistance of zirconia as a function of material thickness after fatigue testing requires evaluation.

Effect of masticatory simulation on the translucency of different types of dental zirconia.

Statement Of Problem: Translucent zirconia has been marketed to dentists seeking to provide esthetic monolithic dental restorations. Evidence on differences in translucency between recently introduced translucent zirconia and conventional zirconia before and after fatigue testing with thermocycling is lacking.

Purpose: The purpose of this in vitro study was to evaluate the effect of fatiguing and thermocycling on the translucency of 5 mol% yttria partially stabilized zirconia (5Y-PSZ) and 3 mol% yttria partially stabilized zirconia (3Y-PSZ) at clinically relevant thicknesses.

Effect of composite type and placement technique on cuspal strain.

Objective: To compare the cuspal strain in Class II restorations made with bulk-fill and conventional composite resins.

Materials And Methods: Fifty extracted maxillary premolars were mounted into phenolic rings and divided into five groups (n = 10). Specimens received standardized MOD preparations.

Development and Assessment of Discrimination Exercises for Faculty Calibration in Preclinical Operative Dentistry.

The aims of this study were to identify the level of interexaminer agreement among preclinical operative dentistry faculty members when grading Class II preparations performed by first-year dental students; to develop discrimination exercises for specific preparation components where interexaminer agreement was poor; and to evaluate if the discrimination exercises were able to improve inter- and intraexaminer agreement. In the preliminary phase of this study, 13 components of 32 Class II cavity preparations were assessed by eight course faculty members at one U.S.

Six-year clinical performance of etch-and-rinse and self-etch adhesives.

Objective: To evaluate the 6-year clinical performance of Xeno IV, Xeno III, and XP Bond adhesives in the restoration of non-carious cervical lesions (NCCLs).

Methods: This was a randomized controlled clinical trial where 39 participants met the inclusion/exclusion criteria and were enrolled. Lesions restored were notch-shaped NCCLs.

Are All Dentiform Teeth with Simulated Caries the Same? A Six-Year Retrospective Study in Preclinical Operative Dentistry.

Dentiform teeth with simulated caries (DTSC), frequently used in preclinical courses, should show no variability in the amount of simulated caries from tooth to tooth. However, the level of caries variability among DTSC is currently unknown. The aim of this study was to assess the variation in simulated caries levels in one group of DTSC and determine whether variation among DTSC impacted the preclinical performance of dental students.

Three-year clinical evaluation of a silorane composite resin.

Statement Of Problem: Composite resins are still outperformed by amalgams in the clinical practice with secondary caries and fractures being their most common failures. A material that suffers less polymerization shrinkage might improve the clinical performance of composite resins.

Purpose: To evaluate the clinical performance of a low-shrink silorane-based composite resin (Filtek LS Low Shrink Posterior Restorative, 3M ESPE, St.

One-year water sorption and solubility of "all-in-one" adhesives.

The aim of this study was to evaluate the water sorption and solubility of different adhesives. Adper Easy Bond, Adper Single Bond Plus, Bond Force, Clearfil SE Bond (bonding resin only), and Xeno IV were the materials evaluated. Ten disks of each adhesive were made in Teflon molds and evaporation of any volatile components was allowed.

Nightguard vital bleaching: side effects and patient satisfaction 10 to 17 years post-treatment.

Statement Of The Problem:   The long-term patient satisfaction and safety of nightguard vital bleaching (NGVB) requires further evaluation.

Purpose Of The Study:   The purpose of this study was to evaluate patients' satisfaction and identify side effects of NGVB up to 17 years post-treatment.

Materials And Methods:   Thirty-one participants who had completed previous NGVB studies using 10% carbamide peroxide were contacted at least 10 years post-treatment (range 10-17 years, average 12.

Enamel and dentin bond strengths of a new self-etch adhesive system.

Unlabelled: statement of problem:  Self-etch adhesives typically are mildly acidic and therefore less effective than etch-and-rinse adhesives for bonding to enamel.

Purpose:   The purpose of this study was to evaluate the enamel and dentin shear bond strengths of a new two-step self-etch adhesive system, OptiBond XTR (Kerr Corporation, Orange, CA, USA).

Materials And Methods:   The labial surfaces of 80 bovine teeth were ground to create flat, 600-grit enamel or dentin surfaces.

Learn-a-prep II as a predictor of psychomotor performance in a restorative dentistry course.

This investigation assessed whether early student performance with a dental handpiece on a didactic training aid known as the Learn-A-Prep II (LAP II) was predictive of performance on subsequent practical examinations in a preclinical restorative dentistry course. Eighty-one first-year students were given initial handpiece training and formative feedback using the LAP II and were then instructed to independently prepare four LAP II patterns within the pattern lines and at a specified depth. Performance on the LAP II was compared with the summative assessment on two subsequent amalgam preparation practical examinations given at the middle (Class II) and end (Complex) of the course.

Distribution and relative activity of matrix metalloproteinase-2 in human coronal dentin.

The presence of matrix metalloproteinase-2 (MMP-2) in dentin has been reported, but its distribution and activity level in mature human coronal dentin are not well understood. The purpose of this study was to determine the MMP-2 distribution and relative activity in demineralized dentin. Crowns of twenty eight human molars were sectioned into inner (ID), middle (MD), and outer dentin (OD) regions and demineralized.

Critical appraisal. Dentin bonding: matrix metalloproteinases and chlorhexidine.

Contemporary resin-dentin bonding is initiated by systems that use phosphoric acid or acidic resin monomers to remove mineral, exposing the superficial dentin collagen matrix. Collagen-associated proteins, including enzymes known as matrix metalloproteinases (MMPs), also are exposed. The collagen matrix is subsequently infiltrated with resins that are polymerized to establish an adhesive attachment to the dentin.

Bond strengths of a silorane composite to various substrates.

Purpose: To evaluate the shear bond strength (SBS) of a novel low-shrink posterior resin composite (Filtek LS) to various substrates.

Methods: The dedicated LS System Adhesive was used to bond Filtek LS to bovine dentin, ground bovine enamel, resin-modified glass-ionomer liner (Vitrebond Plus), conventional glass-ionomer restorative material (Fuji IX GP Extra), and bovine dentin previously exposed to zinc oxide-eugenol (IRM) (n=10 for each group). Vitrebond Plus and Fuji IX GP Extra substrates were fabricated by filling standardized preparations that had been made in epoxy resin.

Ceramic inlays: a case presentation and lessons learned from the literature.

Unlabelled: Ceramic dental restorative materials offer an esthetic alternative to dental amalgam or gold. There is uncertainty relative to the longevity of ceramic inlay restorations. Recently published long-term research studies reveal general clinical performance trends.