Effect of whitening mouthrinses on color change, whiteness change, surface roughness, and hardness of stained resin composites.

Purpose: To evaluate the effect of whitening mouthrinses on the color change, whiteness change, surface roughness, and hardness of stained resin composites after different immersion times.

Methods: Three different resin composites (Estelite Σ Quick, G-Aenial Anterior, Omnichroma) were used to prepare a total of 90 samples (30 samples from each resin composite). The samples were kept in coffee for 12 days, then divided into three subgroups (Control, Crest 3D White, and Listerine Advanced White; n=10 each).

Analysis of Monomer Release from Different Composite Resins after Bleaching by HPLC.

(1) Background: This study aimed to examine the effect of bleaching agents on the release of triethylenae glycol dimethacrylate, 2-hydroxyethyl methacrylate, bisphenol A, urethane dimethacrylate, and bisphenol A-glycidyl methacrylate monomers, which are released from different composite resins, using the high-performance liquid chromatography (HPLC) method. (2) Methods: Ninety disc-shaped specimens were produced and immersed in artificial saliva. After different bleaching applications [office type bleaching (OB) and home type bleaching (HB)], the specimens were immersed in a 75 wt% ethanol/water solution, and the released monomers were analyzed by HPLC at predefined time intervals: 1, 7, and 28 days.

Comparison of the Stress Distribution in Class I and Class II Amalgam and Bulk-Fill Composite Restorations Using CAD-FEM Modeling.

This study compares the mechanical strengths of bulk-fill composite resin and amalgam material to investigate the stress distribution and capacity to mitigate stress of restored Class I and Class II teeth under chewing loads, using finite element analysis. A 3D model of a human mandibular first molar and four Class I (C1) and Class II (C2) caries, including 95-degree cavity-margin angles, were created. Different material combinations were simulated: model C1-A and C2-A, with an amalgam material; and model C1-C and C2-C, with a bulk-fill composite resin.

Comparison of color stability of two laminate veneers cemented to tooth surfaces with and without preparation.

Objective: The aim of this study was to determine the effects of preparation vs nonpreparation of tooth surfaces and the types of porcelain laminate veneers (PLVs) on color changes after 300 hours of artificially accelerated aging (AAA).

Materials And Methods: Forty extracted maxillary central incisors were used. The teeth were divided into four groups (n = 10) to evaluate preparation methods and porcelain types: Group A: tooth preparation with IPS e.

Addition of antibacterial agent effect on color stability of composites after immersion of different beverages.

Objective: The aim of this study was to evaluate the effect of the addition of antibacterial agents to composites on color changes after immersion of these composites in different beverages.

Materials And Methods: Composite resins containing antibacterial agents (bioactive glass [BAG] and nano-zinc silicium [NZS]) and a control group (no agent) were produced. The treatment groups were as follows: control, BAG, NZS, and BAG + NZS.

Evaluation of the fracture resistance of root filled thin walled teeth restored with different post systems.

Background: Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems.