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Biomedical subjects

M da G de Mattos

Publications and source records attributed to M da G de Mattos.

6 recordsLinked to original sources
PubMed1998

Effect of beryllium on the castability and resistance of ceramometal bonds in nickel-chromium alloys.

STATEMENT OF PROBLEM: Castability and ceramometal bond resistance play an important role in accepting nickel-chromium alloys as a substitute for gold alloys in dentistry. PURPOSE: This study was developed to verify the effect of beryllium on these factors in several compositions of nickel-based alloys by submitting them to castability and ceramometal bonding resistance tests. MATERIAL AND METHODS: Three experimental compositions of Ni-Cr alloys with different amounts of beryllium were used. One beryllium-free alloy was used as the control. RESULTS: Analysis of variance and Tukey's test showed significant differences (alpha = .001) for the castability test results and significant differences (alpha = .05) for ceramometal bond resistance between alloys. CONCLUSIONS: Although the amounts of chromium, manganese, and niobium were maintained, the variations in the amounts of beryllium allowed the estimation that Be-containing alloys presented better castability than Be-free alloys. The 0.9% Be-containing alloy demonstrated higher resistance of the ceramometal bond than the Be-free alloy.

Analysis of Variance↗
PubMed1998

Maintenance of prosthetic treatment in a geriatric patient--case report.

A 76-year old female patient came to the Specialized Clinic for Long-Lasting Dentures of the Dental School of Ribeirão Preto, USP, for prosthetic treatment for the correction of the absence of several teeth. The patient's medical history and examination revealed the presence of psoriasis that had progressed to a rheumatoid arthritis-like condition causing motor deficits such as difficulty in picking up and holding a toothbrush. We proposed two acrylic removable partial dentures, with a chromium-cobalt metal support planned for the lower denture. For the maintenance of oral hygiene we proposed an acrylic resin device coupled to the toothbrush in order to increase the volume of the toothbrush, and consequently facilitate tooth brushing. This device, although simple, has permitted the patient to have a more independent and healthy life style.

Aged↗
PubMed1997

Immediate partial denture with a cast metal framework. A 6-year evaluation.

The use of dentures immediately after tooth removal is a common practice in dentistry especially when tooth extraction causes aesthetic problems. In the field of complete dentures, the procedure for the construction of immediate dentures permits the preparation of prostheses with the characteristics of standard dentures that can be used for a long period of time, promoting the recovery of function and aesthetic appearance without impairing patient comfort. For removable partial dentures, immediate prostheses are usually provisional for use over a short period of time while the extraction site heals. These dentures are usually made with acrylic resin and wrought wires, and in addition to compressing delicate parts of the support system, often do not provide the comfort and security needed by the patient. Immediate removable partial dentures with a metal framework are seldom used for this procedure, probably because of the difficulty in fitting the framework prior to surgery. The authors present a clinical example in which a modification of framework positioning permitted previous fitting of the framework, eliminating the possibility of lack of fit after tooth extraction, which resulted in clinical success 6 years later.

Dental Casting Technique↗