Preliminary SEM Observations on the Surface of Elastomeric Impression Materials after Immersion or Ozone Disinfection.

Introduction: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations.

Aim: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials.

Materials And Methods: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone).

The Effect of Repeated Microwaving Disinfection on the Dimensional Stability of Acrylic Dentures.

Objective: The aim of this study was to evaluate the effect of repeated microwave disinfections on the dimensional stability of acrylic dentures.

Materials And Methods: Three groups of dentures made of a heat polymerized acrylic resin were tested. I: dentures kept in water (control group).

Improving the fit of implant prosthetics: an in vitro study.

Purpose: Accurate and passive fit between a prosthesis and its supporting implants has been considered a prerequisite for successful long-term osseointegration. The objective of this in vitro study was to evaluate the strain development during tightening of a five-unit screw-retained superstructure constructed using five different methods.

Materials And Methods: Five-unit screw-retained fixed partial prostheses (n = 25) were fabricated on three implants embedded in an epoxy resin block using five different methods: (1) cobalt-chromium (Co-Cr), plastic cylinders, one-piece cast; (2) Co-Cr, plastic cylinders, framework sectioned, preceramic laser-welding soldering; (3) gold-platinum (Au-Pt), gold cylinders, one-piece cast; (4) Au-Pt, gold cylinders, framework sectioned, preceramic laser-welding soldering; (5) Co-Cr, one-piece cast, and cementation to "passive abutments" (Southern Implants) after final finishing and polishing.

Temperature rise during intraoral polymerization of self-cured hard denture base liners.

The aim of this in-vivo study was to evaluate the temperature rise during polymerization of five chairside self-cured hard denture base reliners. For the same patient, 30 identical baseplates, exposing a space on their tissue surface to accommodate the lining material, were made of a light-cured denture base material. A hole was drilled in the center of this area to enable the thermocouple wire of the temperature measuring device to have direct access to the palatal surface of the baseplate.

The prevalence of temporomandibular disorders among two different denture-wearing populations.

Aim: The aim of this clinicostatistical study was to profile the complete denture wearers of two different populations, to determine any possible relationship between the prevalence of temporomandibular disorders (TMDs) and factors involved in complete denture wearing and to compare this prevalence between the groups.

Materials And Methods: Denture wearers who attended the clinics of the Dental School and Hospital, University of Bristol, U.K.

A long term study on residual monomer release from denture materials.

The aim of this long term study was to investigate the release of residual monomer from different denture materials, throughout a 38 months time period after curing and storage in water Specimens made of four denture base resins (three heat polymerizing, one auto polymerizing) and one hard liner were subjected to residual monomer determination using gas liquid chromatography. The residual monomer estimation carried out on three occasions: one week, 12 months and 38 months after curing. The data obtained were analyzed using two-way Anova followed by Scheffe's test for post hoc multiple comparisons at alpha=0.

Comparison of denture stomatitis prevalence in 2 population groups.

Purpose: The aim of this cross-sectional study was to profile complete denture wearers in 2 different unmatched and nonrandomized population groups and compare any possible relationships between the prevalence of denture stomatitis and other factors involved in wearing complete dentures.

Materials And Methods: Denture wearers who attended the clinics of the Dental School and Hospital, University of Bristol, United Kingdom (group A), and the Dental School, University of Athens, Greece (group B), were examined. The examination included a record of gender, age, years wearing a complete denture, number of dentures used, duration of current denture's usage, daily time period of denture wearing, and clinical examination of the maxillary denture-bearing mucosa.

A clinical 5-year longitudinal study on the dimensional changes of complete maxillary dentures.

Purpose: Acrylic resin complete dentures exhibit dimensional changes mainly because of processing shrinkage and expansion because of water uptake. The aim of this 5-year clinical study was to determine the dimensional changes occurring during construction and in service in maxillary complete dentures made of two types of acrylic resin.

Materials And Methods: Complete dentures were constructed for 17 edentulous patients.

Evaluation of porosity in microwave-processed acrylic resin using a photographic method.

Statement Of Problem: The effect of microwave polymerization on the porosity of denture base resin has not been fully determined.

Purpose: This study investigated the effect of microwave energy on the porosity of 2 heat-activated denture base resins.

Material And Methods: Two heat-activated denture base resins, one conventional (Paladon 65) and one designed for microwave polymerization (Acron MC), were used to prepare 50 test specimens.