Effect of pulp-chamber lateral wall thickness and number on fracture resistance in endocrown-restored molars: An in vitro study.

Background/purpose: It remains unclear how the thickness and number of pulp-chamber lateral walls (PCLWs) affects fracture resistance in endocrown-restored teeth.

Materials And Methods: 64 mandibular molars were collected and randomly divided into eight groups (n = 8). In group C (control group), the teeth were untreated.

Field test of quantum key distribution over aerial fiber based on simple and stable modulation.

We have developed a simple time-bin phase encoding quantum key distribution system, using the optical injection locking technique. This setup incorporates both the merits of simplicity and stability in encoding, and immunity to channel disturbance. We have demonstrated the field implementation of quantum key distribution over long-distance deployed aerial fiber automatically.

Surface roughness and gloss alteration of polished resin composites with various filler types after simulated toothbrush abrasion.

Background/purpose: Few studies have focused on the influence of simulated toothbrush abrasion on the surface qualities of novel nanofilled and nanohybrid composites. The aim of the study was to evaluate the surface roughness and gloss values of resin-based composite (RBC) materials with various filler types before and after simulated toothbrush abrasion.

Materials And Methods: One nanofilled (Filtek Z350 XT [FT3]), two nanohybrids (Harmonize [HM] and Clearfil Majesty [CM]) and one microhybrid (Filtek Z250 [FT2]) were evaluated.

Polymerization shrinkage and shrinkage stress of bulk-fill and non-bulk-fill resin-based composites.

Background/purpose: Bulk-fill resin-based composites (RBCs) are a new class of restorative materials, and polymerization shrinkage (PS) is concerned due to their single increment up to 4 mm. The aim of this study was to evaluate the PS and shrinkage stress (SS) of bulk-fill RBCs in vitro.

Materials And Methods: Three bulk-fill RBCs and three conventional non-bulk-fill RBCs were selected.

Effects of heat treatment on metal-ceramic combination of selective-laser-melted cobalt-chromium alloy.

Statement Of Problem: Components fabricated by selective laser melting (SLM) deform because of residual stress, but heat treatment allows the release of that stress and avoids deformation. Although dental cobalt-chromium (Co-Cr) alloy has been specifically designed for SLM, the effects of heat treatment on the metal-ceramic combination of SLM Co-Cr restorations require investigation.

Purpose: The purpose of this in vitro study was to evaluate the effects of heat treatment on the metal-ceramic combination of SLM Co-Cr alloy.

[Effect of Polident denture cleansers on the properties of heat-polymerized denture base acrylic resin].

Objective: To study the change in properties of heat-polymerized acrylic resin after using one denture cleanser.

Methods: In the study, 20 disk-shaped (50.0 mm×0.

[Study on the properties of self-adhering flowable composite].

Objective: This study was designed to investigate the properties of self-adhering flowable composite by comparison with self-etching adhesive and traditional composite. Moreover, the effect of additional etching process on the bond strength of dentin was investigated.

Methods: Totally 90 bovine incisors were prepared to expose the dentin, and then divided into three groups (Group A, Group B and Group C).

[Evaluation of laser triangulation method for measurement of post-gel shrinkage and post-vitrification shrinkage in composite resins].

Objective: To employ a laser triangulation method for measuring post-gel and post-vitrification polymerization shrinkage of composite resins.

Methods: A novel experimental set-up capable of measuring real-time shrinkage strain was utilized. Total shrinkage of the five composite resins was measured.

Comparison between a silorane-based composite and methacrylate-based composites: shrinkage characteristics, thermal properties, gel point and vitrification point.

A silorane-based composite was compared against methacrylate-based composites in terms of shrinkage characteristics, thermal properties, gel point, and vitrification point. Shrinkage strain was measured using a laser triangulation method. Shrinkage stress was measured using a stress analyzer.

[A new dynamic approach to monitoring dental composite curing kinetics].

Objective: To employ a laser triangulation method for measuring the dynamic shrinkage of composite resins during polymerization, and to investigate the maximum shrinkage rate (S(max)) and the time at maximum shrinkage rate (t(max)).

Methods: A novel experimental set-up based on laser triangulation was utilized which was capable of real-time shrinkage strain measurements. Uncured composite was condensed into a PTFE mould and irradiated for 40 s.