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A clinical trial comparing the efficacy of a glass polyalkenoate cement (GPC) restoration with an amalgam cement restoration (ACR) in the management of caries in the deciduous molar dentition was undertaken. Two hundred and thirty-eight restorations, that is 119 pairs, were placed in 76 patients with an age range of 5 to 11 years. The durability of these(More)
The purpose of this work was to study the relationship between water absorption, dimensional change (swelling) under cavity constraint and radial stress generation in resin matrix dental restorative materials. Water absorption was determined on disc specimens whilst swelling was determined on samples of materials restrained within cavities cut in cast(More)
STATEMENT OF PROBLEM Clinical changes in the viscoelasticity of temporary soft lining materials are characterized by a more rapid and increased reduction in compliance than is seen after in vitro immersion. A possible explanation for these differences is a solvent effect, acting clinically to encourage the loss of ethanol and plasticizer. Dietary solvents(More)
A simple and reproducible method for monitoring the intensity of radiation from composite light-activation units has been developed. The method depends upon the use of a cadmium sulfide photo-conductive cell, the electrical resistance of which varies with the amount of light falling upon its surface. Filters were used for selection of the wavelength of(More)
OBJECTIVE The purpose of the study was to evaluate the effect of the mixing method on the compressive strength and porosity of dental glass ionomer cements. METHOD Five glass ionomer cements were chosen for use in the study. Two were hand mixed and three were encapsulated. The latter were mixed either by shaking or rotating. Following mixing by rotation(More)
OBJECTIVES Fixed appliance therapy in orthodontics relies on the effective bonding of brackets to surface enamel. Bracket de-bonding during treatment is both inconvenient and costly to both dentist and patient. Factors which control the efficacy of the bond are not fully understood. For example, there has never been a study to determine the efficacy of(More)
The aim of this study was to investigate the relationship between acid-etch quality and bond survival in vivo. The subjects were 29 orthodontic patients. High-resolution silicone impressions were taken of the buccal tooth surfaces after etching for 30 seconds with 37% phosphoric acid. The impressions were replicated in epoxy resin and examined under high(More)
A clinical trial of direct composite inlays versus conventionally (incrementally) placed restorations made from the same material was started in January 1989. Restorations were randomly allocated to matched pairs of cavities. This study reports the 3-year performance of 71 of the 100 pairs of restorations placed over a 2-year period and followed-up every 6(More)