RESUMO
CONTEXT: Conventional casting techniques following the manufacturers' recommendations are time consuming. Accelerated casting techniques have been reported, but their accuracy with base metal alloys has not been adequately studied. AIM: We measured the vertical marginal gap of nickel-chromium copings made by conventional and accelerated casting techniques and determined the clinical acceptability of the cast copings in this study. SETTINGS AND DESIGN: Experimental design, in vitro study, lab settings. MATERIALS AND METHODS: Ten copings each were cast by conventional and accelerated casting techniques. All copings were identical, only their mold preparation schedules differed. Microscopic measurements were recorded at ×80 magnification on the perpendicular to the axial wall at four predetermined sites. The marginal gap values were evaluated by paired t test. RESULTS: The mean marginal gap by conventional technique (34.02 µm) is approximately 10 µm lesser than that of accelerated casting technique (44.62 µm). As the P value is less than 0.0001, there is highly significant difference between the two techniques with regard to vertical marginal gap. CONCLUSION: The accelerated casting technique is time saving and the marginal gap measured was within the clinically acceptable limits and could be an alternative to time-consuming conventional techniques.
Assuntos
Ligas de Cromo/química , Revestimento para Fundição Odontológica/química , Técnica de Fundição Odontológica/normas , Adaptação Marginal Dentária/normas , Técnica de Fundição Odontológica/instrumentação , Humanos , Teste de Materiais , Aço Inoxidável/química , Propriedades de Superfície , Preparo Prostodôntico do Dente , Ceras/químicaRESUMO
Orofacial defects can be either congenital or acquired. Rehabilitation of these patients can be done using a surgical and/or a prosthetic approach. In situations where surgical reconstruction is not possible, prosthetic management becomes the only option. This clinical report describes a simple, economical, and effective technique for the prosthetic rehabilitation of a patient with oro-cutaneous fistula due to donor site dehiscence following tumor defect reconstruction.
