RESUMO
Objective@#The objective of this study was to compare the early clinical effects of zirconia all⁃ceramic crowns using two different impression methods. Zirconia ceramic crowns were produced using digital models based on either a silicone rubber impression perfusion model in vitro or a 3D mouth scanner.@*Methods @#A total of 50 patients with a planned restoration of the first permanent molar with zirconia all⁃ceramic crowns after root canal therapy were se⁃ lected and randomly divided into two groups: a digital impression by intraoral 3D scanning group and a digital impres⁃ sion by extraoral scanning after silicone rubber impression group. Zirconia all⁃ceramic crowns were created by CAD/ CAM in both groups. Marginal adaptation, proximal contact, and occlusal contact were compared between groups. @*Results@#There was no significant difference between the two groups in marginal adaptation (P > 0.05). For proximal con⁃ tact and occlusal contact, no significant differences regarding the number of cases for the criteria of level A and level B were found between two groups (P > 0.05), while the misfit value in level B was smaller in the first group than in the second group (P < 0.05). @*Conclusion@#Zirconia all⁃ceramic crowns with intraoral 3D scanning show excellent early clinical performance.
RESUMO
OBJECTIVE: In order to establish the normal value of Holdaway analytical method of Chongqing and to reveal the regular patterns and characteristics concerning the craniofacial morphology. METHODS: 58 students, with permanent dentition were selected as the samples. The cephalometric images were scanned into a computer and the images were imported into the program. The cephalometric analysis were automated by the computer. The cephalometric analytical method of Holdaway was used in this study. Correlational analysis were calculated. RESULTS: The normal values of Holdaway analytical method for permanent denition on normal occlusal adults of Chongqing were established and compared with that of Pekingman, Japanese and White man. CONCLUSIONS: We found that soft cephalometric measurement values are various in sex and races and regional population. There were correlations between hard and soft tissues.
