ABSTRACT
AIM: To evaluate the dimensional stability of a new facial molding technique using thermoplastic custom molding tray. METHODS: The designs established demarcation of facial anthropometrics landmarks, making linear measurements with a digital caliper. Facial molding was carried out using thermoplastic custom trays, constructing a facial plaster cast with the anthropometric landmarks already transferred by measuring the linear dimensions on the plaster cast and statistical analysis. RESULTS: All linear measurements in the palpebral and labial regions presented statistically significant distortions. Only one of the linear measurements from the orbital region did not demonstrate any significant distortion. The nasal region presented the least amount of distortion. CONCLUSIONS: Although statistically significant, distortions were due to the method of breathing and were considered to be clinically irrelevant. The reduction in the working time, the comfort provided to the patient and the dimensional accuracy of the plaster cast obtained by the facial molding technique using custom perforated molding tray suggest that this technique should be employed for making facial prostheses.
Subject(s)
Humans , Male , Female , Anthropometry/instrumentation , Dental Impression Materials , Face/anatomy & histology , Dental Impression Technique/instrumentationABSTRACT
A adaptação do cone de guta-percha ao preparo obtido pela instrumentação é importante para a etapa de obturação. O objetivo deste estudo foi comparar o diâmetro do preparo adquirido pelo instrumento reciprocante Wave One Primary (Dentsply Maillefer, Ballaigues, VD, Switzerland) e o diâmetro de cones de guta-percha Wave One Primary. Dezesseis canais mesiais de molares inferiores foram instrumentados com a lima reciprocante Wave One Primary, e os canais moldados com resina acrílica. Após descalcificação do dente, a resina foi removida e analisada num perfilógrafo (Werth GmbH, Giessen, HE, Alemanha). Dezesseis cones de guta-percha Wave One Primary também foram analisados. Os diâmetros do terço cervical, médio e apical dos preparos (resina) e dos cones de guta-percha foram submetidos ao teste U de Mann Whitney (p=0.05). Os dados apresentaram diferença significativa em todos os terços com preparos mais amplos que os cones de guta-percha. Pode-se concluir que o diâmetro do preparo produzido pelas limas Wave One Primary não possuem correspondência ao seu respectivo cone de guta-percha, cujo preparo é mais amplo em todos os terços.
The fit of gutta-percha cone on the root canal shaping is important to the step obturation. Therefore, the aim of this study was to compare the diameter of the shaping produced by Wave One Primary reciprocating single-file (Dentsp/y Maillefer, Ballaigues, VD, Switzerland) and the Wave One Primary gutta-percha points. Sixteen mesial root canais of mandibular molars were prepared using Wave One Primary reciprocating single-file, and then they were filled with acrylic resin. After decalcification of teeth, the resin was removed and analyzed using perfilograph (Werth GmbH, Giessen, HE, Germany). Sixteen Wave One Primary gutta-percha points were also analyzed. The diameter of third coronal, medium and apical of the shaping (resin) and gutta-percha points were compared using Mann WhitneyU test (p=0.05). The data showed significant difference in ali thirds with shaping larger than gutta-percha points. It can conclude that the dia meter of shaping produced by Wave One Primary reciprocating single-file does not match the diameter of its gutta-percha point, the shaping is larger in ali thirds.