Resumo

MAINIEI, Ézio Teseo; OSHIMA, Hugo Mitsuo Silva; SHINKAI, Rosemary Arai Sadami  e  MAINIEI, Vivian Chiada. In vitro analysis of the internal relief of full crowns after the use of die spacers. RGO, Rev. gaúch. odontol. (Online) [online]. 2010, vol.58, n.4, pp. 503-510. ISSN 1981-8637.

OBJECTIVE: This research evaluated the internal relief in full crowns after the use of die spacers. METHODS: Twenty nickel-chromium crowns were made and divided into four groups of five crowns each, according to the number of die spacer layers used .The space between the inside walls and outside walls of the metal master die of each crown was measured. The measurement was done by injecting a very light-bodied addition silicone inside the crowns. The resulting samples were cut in half along the occlusal cervical plane and the halves were scanned in high resolution together with a slide caliper. The resulting images were transferred to the Image Tool 3.0 software for measuring the internal relief obtained from two equidistant points on each axial wall and on the occlusal wall. The relief means in micrometers in the different walls were statistically analyzed by analysis of variance, Tukey test and Student's t-test. RESULTS: As the number of spacer layers increases, so does internal relief. The occlusal wall of Group 4 was very thick, equivalent to that of Group 2, which is explained by the impression material not flowing inside the crown. CONCLUSION: The application of die spacers before waxing allows the operator to obtain casts with controlled internal reliefs, making room for the cement.

Palavras-chave : Dental marginal adaptation; Tooth crow; Dental casting technique.