Photoelastic stress analysis of mandibular fixed prostheses supported by 3 dental implants.

Purpose: To observe the photoelastic stress patterns generated around implants in relation to variations in the diameter and total number of implants supporting fixed complete-arch mandibular frameworks.

Materials And Methods: Three different implant configurations were analyzed (n = 3): 5 standard implants with diameters of 3.75 mm (C), 3 standard implants with diameters of 3.

Influence of crown-to-implant ratio on stress around single short-wide implants: a photoelastic stress analysis.

Purpose: The aim of this study was to evaluate the photoelastic fringe patterns around two short-wide implants supporting single crowns with different crown-to-implant (C/I) ratios.

Materials And Methods: External hexagon (EH) cylindrical implants (5 × 7 mm) or Morse Taper (MT) conical implants (5 × 6 mm) were embedded individually into photoelastic resin blocks. Each implant received a single metal-ceramic crown, with a C/I ratio of 1:1 or 2:1 (n = 10).

Stress evaluation of implant-abutment connections under different loading conditions: a 3D finite element study.

This study evaluated the effects of axial and oblique occlusal loading on implant-supported partial dentures with different connection systems (external hexagon, internal hexagon, and Morse taper). Upon axial loading, all systems presented similar stress values. Stress values increased under oblique loading.

Photoelastic analysis of the distribution of stress in different systems of overdentures on osseous-integrated implants.

Objective: The aim of this study was to evaluate the distribution of generated stress around implants and adjacent bone tissue using different implant-retained overdenture designs through photoelastic analysis.

Methods: Over an edentulous human mandible, achieved from a human model, 2 or 4 microunit analog abutments were embedded (Master; Conexao Systems Prosthodontics, São Paulo, Brazil), settled in the interforaminal region. Three models of photoelastic resin (Araltec Chemicals Ltda, Hunstman, Guarulhos, São Paulo, Brazil), with 2 or 4 incorporated implants and microunit abutments, were obtained from molds using silicone for duplication.

Fatigue strength: effect of welding type and joint design executed in Ti-6Al-4V structures.

Background: This study evaluated the fatigue strength of Ti-6Al-4V-machined structures submitted to laser (L)-welding and TIG (TIG)-welding procedures, varying the joint designs.

Materials And Methods: Seventy dumbbell rods were machined in Ti-6Al-4V alloy with central diameters of 3.5 mm.

Influence of prosthetic screw material on joint stability in passive and non-passive implant-supported dentures.

Objectives: This study evaluated the influence of prosthetic screw material on joint stability in implantsupported dentures at two levels of fit.

Methods: Ten mandibular implant-supported dentures were fabricated. Twenty cast models were fabricated using these dentures.

Influence of laser-welding and electroerosion on passive fit of implant-supported prosthesis.

This study investigated the influence of laser welding and electroerosion procedure on the passive fit of interim fixed implant-supported titanium frameworks. Twenty frameworks were made from a master model, with five parallel placed implants in the inter foramen region, and cast in commercially pure titanium. The frameworks were divided into 4 groups: 10 samples were tested before (G1) and after (G2) electroerosion application; and another 10 were sectioned into five pieces and laser welded before (G3) and after (G4) electroerosion application.

Influence of simulated microwave disinfection on complete denture base adaptation using different flask closure methods.

Statement Of Problem: Denture microwave disinfection may result in dimensional changes that may distort the acrylic resin base, causing discomfort to the patient.

Purpose: The purpose of this study was to determine the effect of simulated microwave disinfection on maxillary denture base adaptation using 2 different flask closure methods.

Material And Methods: Forty stone cast-wax base sets were prepared for flasking by the traditional flask closure (TFC) and Restriction System flask closure (RSFC) methods (n=20).

Immediate function in the edentulous mandible: replacement of a lost implant using prefabricated guides.

This article describes a technique for replacement of a lost implant. The procedure involves the use of templates, drill guides, and drills of the system to replace a 4.5-mm-wide lost implant with a 5.

Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners.

Statement Of Problem: Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging.

Purpose: This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases.

Material And Methods: Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions.