Objective: Evaluate the effects of the scanning techniques and the crystallization in the internal and marginal adaptation of milled lithium disilicate crowns by two techniques computer microtomography analysis. Materials and Methods:Sixteen polyurethane teeth prepared for a complete crown were divided into two groups according to the scanner method (n = 8): indirect (IND), dental stone models were scanned with laser-surface scanner, and direct (DIR), digital typodont creates with an intraoral scanner. Internal and marginal gap were evaluated by micro-computed tomography (microCT). The replica technique (RT) was applied for analysis of total volume (TV) and marginal volume (MV) gap in microCT. The data showed normal distribution (Shapiro-Wilk test). One-way ANOVA (scanner techniques) with repeated measures (crystallization) was performed. Multiple comparisons were performed with Bonferroni adjustment (α = .05). Results:The axial gap showed a significant difference between the times (P = .017) for lower values after crystallization. The vertical marginal gap presented a significant difference in times for higher value after crystallization (P = .001). The marginal horizontal gap IND was greater than DIR after crystallization (P = .001) and IND before lower than after crystallization. For TV was not significant difference and MV in DIR was reduction (P = .002) after crystallization. Conclusion: Crystallization changes the relationship between the crown and tooth, reducing internal gap and preventing the adequate fit in indirect and direct scanning. Clinical Significance: The measure gap under technological methodology is useful for adjust clinical parameters prosthetic in the CAD/CAM and the applicability of the new possibilities of analysis.
À Deus, por me guiar, iluminar, segurar e fortalecer até mesmo em momentos que eu não me dei conta de sua presença. Por ser meu caminho, verdade e vida. À meus pais. Mãe, obrigada pela educação, força, garra e ao mesmo tempo, delicadeza e cuidado diante da vida. Obrigada por ser quem sou hoje, obrigada por ter pensado em mim mais do que em você mesma. Estar escrevendo esse agradecimento a você na minha dissertação pela Universidade de São Paulo é uma das formas que se aproxima à minha gratidão por tudo que fez por mim. Minha melhor amiga, fiel e companheira. Eu te amo! Pai, obrigada pela educação, por me amar, por cada suor que fez por mim, pela confiança, por acreditar, por se fazer presente, por ter me apoiado estar onde eu estou hoje. Orgulho de ter você como exemplo de generosidade, sensibilidade, guerreiro, e honestidade. Espero corresponder próximo ao que o senhor merece. Minha eterna gratidão. Eu te amo! À minha irmã, Raquel. Obrigada por ter chegado à minha vida, ter trazido cores e alegria. O que eu vivi com você, desde bebê, é um amor muito profundo. Cuidava e amo como uma jóia rara que quero todo bem do mundo. Desculpe-me a distancia. Saiba que meu coração é todo seu, que sou sua amiga, confidente, e mãe se for preciso. Conte sempre comigo. Eu te amo! À minha avó, Maria Marli. Meu anjo, ternura e morada. Obrigada por cada alegria e dor que compartilhou comigo como se fossem suas. Obrigada pelos ensinamentos, carinho, abraços, infância. Obrigada por ser a minha avó, por me amar tanto e ser meu exemplo de pessoa por inteiro. Obrigada pelo seu amor, ajuda emocional, financeira, e espiritual. Obrigada por ter vivido comigo um dos momentos mais marcantes em minha vida. Ter vibrado e segurado minhas lágrimas em seus ombros. É uma alegria imensurável a senhora estar lendo isso agora, te dedico todo meu esforço e luta. Eu te amo! Ao meu padrastro, Jorge, obrigada por ter me acolhido e feito tanto por mim durante a minha vida. Obrigada por confirar e acreditar, pela preocupação, cuidado educação, lição de disciplina e garra na vida. É uma realização ter a oportunidade de te agradecer em minha dissertação de mestrado e dizer o meu muito obrigada. Saiba que tens meu amor e como sua filha postiça. Amo você! À minha madrastra, Marina, a minha gratidão mais sincera e profunda. Obrigada por gostar de mim, pela amizade, e carinho. Obrigada por cuidar tão bem da minha jóia rara, meu pai e ainda ser uma companhia abençoada para minha avó. Obrigada por ser generosidade, doação, amor e parceria para minha família. Amo você! Ao Iago, obrigada pela generosidade, parceria e cuidado com minha família enquanto não estive presente fisicamente, que Deus abençoe seus sonhos mais profundos. À minha tia Jacque. Não tenho palavras que expressem o que vivemos e nos tornamos. Obrigada por ter me estendido a mão, seu instrumento de trabalho além do mundo físico, pois tocou minha alma e desbravou meus sonhos mais profundos. Obrigada por ter me adotado, ter cuidado, ter zelado. Obrigada pelo ombro amigo, ter me segurado tantas vezes minh...
The objective of this study was to observe patients’ satisfaction with their in-service direct anterior dental restorations and to compare it with clinical evaluation using FDI (Federation Dental International) criteria. Patients scored their own anterior dental restorations regarding satisfaction (satisfactory /dissatisfactory). If dissatisfaction was mentioned, then, they would be interviewed about the complaint. In the same session, the dental restorations were clinically evaluated by two dentists using FDI criteria (1-5 score) concerning esthetic, functional, and biological domains. Descriptive statistics were used for frequencies of scores attributed by patients and clinicians. In order to compare patients’ to clinicians’ frequencies, the Chi-square test was applied (p ≤ 0.05). A total of 106 restorations were evaluated by patients and clinicians. Patients reported 52.8% of restorations satisfactory and 47.8% dissatisfactory. Overall, clinicians reported the same restorations as 82,3% satisfactory and 17,6% dissatisfactory. Patients’ most frequent complaints referred to color, followed by anatomical form, fracture of material and retention, and approximal anatomical form. Comparing patients’ satisfaction and dissatisfaction rates to clinicians’ evaluation per criteria, there was no difference regarding esthetics. The frequency of dissatisfactory restorations by clinicians was significantly lower when functional and biological properties were compared with patients’ opinions. Direct anterior dental restorations were more frequently reported as satisfactory by patients and clinicians, being the main complaints related to esthetic issues. When clinicians and patients’ evaluations were compared, it was observed that the frequencies of satisfactory restoration by patients and clinicians were similar regarding esthetic properties, and significantly different regarding functional and biological properties.
This study evaluated the vertical misfit, passivity, and stress distribution after tightening the screws of different prosthesis. Two implants were used to simulate the rehabilitation of partially edentulous mandible space from the second premolar to the second molar. 40 three-element screw-retained fixed dental prosthesis with distal cantilever were fabricated and divided into four groups according to the method of production of framework (n = 10): G1 = conventional casting one-piece framework, G2 = conventional casting sectioned and laser welding, G3 = conventional casting sectioned and tungsten inert gas (TIG) welding and G4 = framework obtained by CAD/CAM (computer-aided design/computer-aided manufacturing) system. The vertical misfits (both screws tightened) and the passive fit (one screw tightened) were measured under a comparator optical microscope. The data was submitted to Shapiro-Wilk test to enable comparison with ANOVA followed by Tukey with Bonferroni adjust (α = .05). The qualitative analysis of the stress distribution was performed by the photoelastic method. The vertical misfit (both screws tightened) of the G2 (24 μm) and G3 (27 μm) were significantly higher than G4 (10 μm) (p = 0,006). The passive fit (for the non-tightened) of the G1(64 μm) and G3 (61 μm) were significantly higher than the G4 (32 μm) (p=0,009). G1 showed high stress between the implants in the photoelastic analysis and G4 presented lower stress. In conclusion, CAD/CAM method results in less vertical misfit, more passivity, and consequently better stress distribution to the bone.
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