Diversos fatores podem ocasionar perdas dentárias no indivíduo, prejudicando a harmonia facial e a fisiologia do sistema estomatognático, influenciando principalmente na mastigação, na fonação e no equilíbrio articular. Em casos mais complexos que envolvem perdas dentárias múltiplas, é necessário o restabelecimento da dimensão vertical de oclusão (DVO), assim como a procura pela estética e aumento da autoestima é constantemente requisitada. O objetivo deste trabalho foi relatar um caso clínico de reabilitação oral com prótese implanto suportada associada à prótese dento suportada, em que foram restabelecidos a DVO, estética, função e equilíbrio do sistema estomatognático. O tratamento do paciente de 56 anos, leucoderma e do gênero masculino, foi realizado na clínica odontológica do Centro Universitário de Volta Redonda e após anamnese, exame clínico, análise das fotografias, da panorâmica e dos modelos de estudo observou- se perda de função mastigatória, estética e colapso na dimensão vertical de oclusão. O paciente negou alergias e relatou ser diabético e hipertenso, porém em tratamento controlando as morbidades. A reabilitação oral foi realizada através da confecção de prótese fixa tipo protocolo Branemark anterior modificado sobre dentes e implantes. Conclui-se que a satisfação do paciente se fez muito evidente com a melhora funcional e estética através da instalação da prótese provisória tipo protocolo anterior modificado a partir de resina acrílica PMMA, respondendo de maneira satisfatória a todos os requisitos necessários até essa fase da reabilitação, restabelecendo a dimensão vertical de oclusão, devolvendo a eficiência mastigatória, assim como reequilibrando o sistema estomatognático influenciando psicossocialmente em sua qualidade de vida.
The goal of this study was to evaluate the bonding resistance of two dental ceramics. The samples, one of each type of ceramics, were split into 4 groups (n=4) separated from those from control group, the others were conditioned with 5% hydrofluoric acid, according to the times of 20, 40 and 60 seconds. Cylindrical pins of resin cement were applied in each sample. After a shearing test, the obtained results showed that experimental groups has given higher bonding strength values than the control groups for both ceramics. For the e.max ceramic, the highest values were observed with timings of 20 and 40 seconds and for the Suprinity ceramic the conditioning timings were insignificant. The authors concluded that the surface treatment with hydrofluoric acid improved the bonding strength for both ceramics; and the e.max ceramic showed higher bonding values than the Suprinity.
Objective: To evaluate different methods of additional polymerization in the Vickers’ microhardness of three composite resins. Material and Methods: With assistance of a metallic matrix (3 x 4mm), 30 specimens (sps) of each direct resin composite (drc) were prepared, entitled: Filtek Z250(3M ESPE, Saint Paul/MN-USA)(Gr1), W3D(Wilcos, Petrópolis/ RJ-Brazil)(Gr2), and EstheticX (Dentsply/York/PA-USA)(Gr3). All sps were photopolimerized, by the incremental technique, during 40 seconds (Gr1 - n=10: control). After that, 20 samples of each group were divided and half of the samples (n=10) were submitted to the additional polymerization during 15 minutes to 127ºC in autoclave (Gr2) and the other half in stove (Gr3). After all sps were stored in distilled water (37ºC/24 hours). The microhardness was accomplished in digital machine (Future-Tech, FM 700 Model), with 50kg of load. The data obtained (Kg/mm2) were analyzed utilizing the ANOVA Test (2 factors) and Tukey test (p<0.05). Results: The values of mean ± standar deviations obtained were: Gr1a(84,2±5,1), Gr1b (71,6±6,7), Gr1c (89,6±7,4), Gr2a (101,1±6,0), Gr2b (96,4±9,0), Gr2c (112,6±7,3), Gr3a (74,0±6,5), Gr3b (66,0±12,7) e Gr3c (81,7±6,5). The polymerization in stove produced a higher microhardness than the other kinds of polymerization (p<0.05) and the microhardness of the resins statistically differed among them (p<0.05). Conclusion: The additional polymerization of the Filtek Z250 in the stove produced microhardness statistically higher than the others.
Ceramics are widespread used in restorative dentistry, mainly due to their aesthetics features. However, adequante bond strenght of this type on restoration to tooth structure spawned several investigations which aim to develop a clinical protocol for ceramic surface treatment. The objective of this study was to evaluate the influence of air temperature on the drying process of silane agent and the adhesion of feldspar and yttrium stabilized zirconia. They were divided into three groups (n=10): control; room temperature dried silane; and silane drying at 70º C. Then, composite resin cylinders were bonded to the samples and taken to a shear test. The results showed that air temperature rise, in silane drying, improved bonding resistance in Y-TZP ceramics, nevertheless in feldspatic ceramics, the bonding resistance was not altered.
When it comes to providing reliable adhesion of low silica content alumina ceramic, hydrofluoric acid etching along with silanization has not shown sufficient efficacy because the microstructure of high-alumina content ceramics is unable to degrade them. The objective of this study was to analyze the effect of surface sandblasting of zirconia-based ceramic stabilized by yttria as used in dental prostheses, using a SEM and roughness average. The samples were divided in control, no surface treatment; Al2O3sandblasting; Al2O3sandblasting and Al2O3+ SIC particles 110 µm average sized; Al2O3sandblasting and Al2O3+ SIC particles 110 µm average sized milled for 2 hours; Al2O3sandblasting and Al2O3+ SIC particles 110 µm average sized milled for 6 hours. The Al2O3sandblasting and the 2-hour milled Al2O3+ SIC particles showed better results and better characterization of roughness in SEM with the silica deposition on the samples surface.
The aim of this study was to standardize the parameters for testing the hardness and elastic modulus for dental composites. It used the equipment Dynamic Ultra Micro Hardness Tester DUH-211 / DUH-211S (Shimadzu) varying the load and the hold time. two composites were used with various inorganic particles that were embedded and sanded for the assay. one Vickers indenter was used being held nine rows with ten penetrations. For each composite loads were used (20, 50 and 100gf) and times (zero, five and ten seconds). The results showed that the effect of the load and the hold time had influence on the modulus and hardness values of the studied composites. The authors concluded that loads and hold larger team showed greater stability of hardness values and modulus of elasticity for the studied composites and these values for both hybrid composites as for nanoparticulate were dependent on load and time.
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