Accuracy of Three Cone Beam Computed Tomography Systems in the Detection of Implant-Abutment Misfit.

PURPOSE: To assess the accuracy of three cone beam computed tomography (CBCT) systems in misfit detection at the implant-abutment joint. MATERIALS AND METHODS: A total of 32 implants were placed in dry human mandibles. Porcelain-fused-to-metal crowns, both with and without a 200-µm-thick gap at the implant-abutment joint, were placed and then scanned using three CBCT systems: Picasso Trio (PT), OP300 (OP), and Scanora 3D (SC). Images were assessed, and area under the receiver operating characteristic curve (Az) values were compared (a = .05). RESULTS: Az values obtained with PT (0.86) were significantly higher than with OP (0.63) and SC (0.64) (P < .05). CONCLUSION: Images acquired with PT allowed for more accurate misfit detection at the implant-abutment joint due to higher contrast resolution.

Estudo ao microscópico óptico e eletrônico de transmissäo na cicatrizaçäo de feridas produzidas pelo laser de CO2 no palato do rato / Light and transmission electron microscopic study of CO2 laser wound healing on palatine mucosa of rats

Os autores estudaram a cicatrizaçäo de feridas produzidas pelo laser CO2 na mucosa palatina do rato. A cicatrizaçäo ocorreu em uma semana, e a regiäo atingida foi ocupada por tecido conjuntivo neoformado e por epitélio. Foram notados os numerosos leucócitos polimorfonucleares e fibroblastos entre as fibras colágenas neoformadas