Finite element analysis of FGM dental crowns using phase-field approach.

Functionally graded materials (FGMs) - categorized in advanced composite materials - are specially designed to reduce the stresses and failure due to material mismatches. Advances in manufacturing techniques have brought FGMs into use in a variety of applications. However, the numerical analysis is still challenging due to the difficulties in simulations of non-homogeneous material domains of complex parts.

Influence of various metal oxides on mechanical and physical properties of heat-cured polymethyl methacrylate denture base resins.

Purpose: To evaluate the effect of various metal oxides on impact strength (IS), fracture toughness (FT), water sorption (WSP) and solubility (WSL) of heat-cured acrylic resin.

Materials And Methods: Fifty acrylic resin specimens were fabricated for each test and divided into five groups. Group 1 was the control group and Group 2, 3, 4 and 5 (test groups) included a mixture of 1% TiO2 and 1% ZrO2, 2% Al2O3, 2% TiO2, and 2% ZrO2 by volume, respectively.

The bond strength of a highly cross-linked denture tooth to denture base polymers: a comparative study.

Purpose: This study compared shear bond strength and type of bond failure between a highly cross-linked tooth and different denture base polymers.

Materials And Methods: Cross-linked denture teeth were bonded to either a heat-, an auto-, a microwave-polymerized denture base resin or a relatively new injection-molded, microwave-polymerizable polyurethane-based resin. Six experimental groups were established for each of the shear and peel tests.

Impact of dental and zygomatic implants on stress distribution in maxillary defects: a 3-dimensional finite element analysis study.

The aim of this study was to evaluate the stress distribution in the bone around dental and zygomatic implants for 4 different implant-supported obturator prostheses designs in a unilaterally maxillary defect using a 3-dimensional finite element stress analysis. A 3-dimensional finite element model of the human unilateral maxillary defect was constructed. Four different implant-supported obturator prostheses were modeled; model 1 with 2 zygomatic implants and 1 dental implant, model 2 with 2 zygomatic implants and 2 dental implants, model 3 with 2 zygomatic implants and 3 dental implants, and model 4 with 1 zygomatic implant and 3 dental implants.

An impression technique for implant-retained orbital prostheses.

This article describes an impression technique to transfer implant positions to the definitive cast using magnetic attachments splinted with acrylic resin for an implant-retained orbital prosthesis. The acrylic resin transfer device that incorporated the magnets was also used as the acrylic resin magnet substructure for the silicone orbital prosthesis.

Color stability of glazed and polished dental porcelains.

Purpose: The purpose of this study was to compare the visual and colorimetric color stability of two ultra low-fusing and three conventional low-fusing porcelains on both glazed and polished surfaces.

Materials And Methods: Twelve disks, 10 mm in diameter and 3 mm in thickness, were fabricated for each porcelain. Specimens were glazed using their specific glaze materials.

Effects of mesiodistal inclination of implants on stress distribution in implant-supported fixed prostheses.

Purpose: Patterns of von Mises stress values surrounding implants supporting fixed prostheses in the posterior edentulous maxilla were evaluated using 3-dimensional finite element analysis.

Materials And Methods: Implants were placed in maxillary bone in 2 different configurations. In the first configuration, implants were placed in the first premolar, second premolar, and second molar regions; in the second configuration, implants were placed in the second premolar and second molar regions, and a mesial cantilever was extended to the space of the first premolar tooth on the superstructure.

Dynamic mechanical analysis of provisional resin materials reinforced by metal oxides.

In this study, several provisional resin materials were investigated by dynamic mechanical analysis (DMA). The materials were autopolymerized PMMA and PEMA, light cured PMMA. Autopolymerized PMMA has the highest T(g) (131 degrees C) compared to that of the autopolymerized PEMA (102 degrees C) and light cured PMMA (120 degrees C).

Clinical examination and interleukin-1beta levels in gingival crevicular fluid in patients treated with removable partial dentures.

Purpose: The purposes of this study were to investigate the periodontal status and susceptibility to periodontal disease progression of the teeth in contact with removable partial dentures (RPD) and to compare them with control teeth in mouths not restored with a partial denture, by means of both clinical parameters and interleukin (IL)-1beta levels in gingival crevicular fluid.

Materials And Methods: Twenty-eight periodontally healthy patients were selected for the study; 14 of them were treated with mandibular Kennedy Class I RPDs, and the other 14 patients were not restored for control. Clinical periodontal measurements were assessed, and crevicular fluid samples were collected from both abutment and control teeth to determine IL-1beta levels, which were measured by enzyme-linked immunosorbent assay.