The aim of this study was to evaluate the conventional and boiled polymerization cycles on gloss, roughness, hardness and impact strength of acrylic resins. Samples were made for each Classico and QC-20 materials (n=10) in dental stone molds obtained from rectangular metallic matrices embedded in metallic flasks. The powder-liquid ratio and manipulation of the acrylic resins' were accomplished according to manufacturers' instructions and the resins were conventionally packed in metallic flasks. After polymerization by (1) conventional: 74 °C for 9 h (Classico) and (2) boiled: 20 min (QC-20) cycles, the samples were deflasked after cooling at room temperature and conventionally finished and polished. The properties were evaluated after storage in water at 37 °C for 24 h. Gloss was verified with Multi Gloss 268 meter (Konica Minolta), surface roughness was measured with Surfcorder SE 1700 rugosimeter (Kosaka), Knoop hardness number was obtained with HMV-200 microdurometer, and impact strength was measured in an Otto Wolpert-Werke device by Charpy system (40 kpcm). Data were subjected to Student's t-test (at α=0.05). The results were: Gloss: 67.7 and 62.2 for Classico and QC-20 resins, respectively; Surface roughness: 0.874 and 1.469 Ra-µm for Classico and QC-20, respectively; Knoop hardness: 27.4 and 26.9 for Classico and QC-20, respectively; and Impact strength: 37.6 and 33.6 kgf/cm2 for Classico and QC-20, respectively. No statistically significant difference (p>0.05)were found between the resins for the evaluated properties. In conclusion, conventional and boiled polymerization cycles had similar effects on gloss, roughness, hardness and impact strength of both Classico and QC-20 resins.

Higher vertical misfit increased the stress values on the overdenture-retaining bar system; complex cross-sectional designs increased stress values on the bar framework, prosthetic screw, and periimplant bone tissue; stiffer alloys caused higher stress values on all the studied conditions.

ResumoIntrodução: A qualidade das próteses totais pode ser influenciada pelo método de confecção. Objetivo: Avaliar a influência de diferentes métodos de confecção de próteses totais na adaptação e movimentação de dentes. Material e método: A confecção das próteses foi dividida em dois grupos (n=10) para arcadas superior e inferior de acordo com o método: 1) convencional de uma etapa -realizada uma base de prova em cera onde foram montados os dentes e levada para a termopolimerização; 2) Método de duas etapas -a base foi encerada e termopolimerizada. Com a base da prótese polimerizada, os dentes foram montados e em seguida realizou a polimerização da outra porção. Para movimentação de dentes foram avaliadas as distâncias entre incisivos (I-I), pré-molares (PM-PM), molares (M-M), incisivo esquerdo a molar esquerdo (IE-ME) e incisivo direito a molar direito (ID-MD) antes e após polimerização final. As próteses foram seccionadas em três posições para análise de adaptação: (A) face distal de caninos, (B) face mesial de primeiros molares, e (C) face distal de segundos molares. Resultado: As bases das próteses demonstraram melhor adaptação quando polimerizadas no processo de uma etapa, tanto superiores (p<0,05) quanto inferiores (p<0,05), com a região A apresentando melhor adaptação que a região C. Na arcada superior uma redução na distância entre I-I foi observada na técnica de uma etapa, enquanto que na técnica de duas etapas houve redução na distância ID-MD. Na arcada inferior, na técnica de uma etapa houve redução na distância ID-MD e houve redução significativa na distância IE-M pelo método de duas etapas. Conclusão: O método de uma etapa apresentou melhores resultados para a adaptação da prótese. Ambos os métodos de confecção apresentaram alteração na movimentação de dentes.Descritores: Prótese total; adaptação; polimerização. AbstractIntroduction: The quality of complete dentures might be influenced by the method of confection. Objective: To evaluate the influence of two different methods of processing muco-supported complete dentures on their adaptation and teeth movements. Material and method: Denture confection was assigned in two groups (n=10) for upper and lower arches according to polymerization method: 1) conventional one-stage -a wax trial base was made, teeth were arranged and polymerized; 2) two-stage method -the base was waxed and first polymerized. With the denture base polymerized, the teeth were arranged and then, performed the final polymerization. Teeth movements were evaluated in the distances between incisive (I-I), pre-molars (P-P), molars (M-M), left incisor to left molar (LI-LM) and right incisor to right molar (RI-RM). For the adaptation analysis, dentures were cut in three different positions: (A) distal face of canines, (B) mesial face of the first molars, and (C) distal face of second molars. Result: Denture bases have shown a significant better adaptation when polymerized in the one-stage procedure for both the upper (p=0.000) and the lower (p=0.000) arches, with region A presenting si...