Resistência à fratura de próteses parciais fixas de zircônia: efeito da aplicação da cerâmica de cobertura e do jateamento na região gengival dos conectores e pônticos
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Data
2012-02-03
Autores
Campos, Fernanda [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Este estudo avaliou o efeito do aplicação da cerâmica de cobertura e do jateamento da infraestrutura (IE) cerâmica na região gengival dos conectores e pônticos com partículas de alumina revestidas por sílica e com partículas alumina na resistência à fratura de próteses fixas. Foram confeccionados 80 pilares em Resina G10 (Accurate Plastics, EUA), sendo 40 com base circular de 8 mm de diâmetro (representando um molar preparado) e 40 com base circular de 6 mm de diâmetro (representando um pré-molar preparado), ambos com características de um preparo para coroa total (altura: 6 mm, angulação: 6°, término em chanfro largo). Esses pilares foram incluídos em resina de poliuretano com a ajuda de um dispositivo metálico que padronizou a distância entre as bases dos pilares em 11 mm, constituindo os modelos. Os modelos foram escaneados e, a partir de blocos de cerâmica a base de zircônia (Vita In-Ceram 2000 YZ Cubes, Vita), foram confeccionadas infraestruturas cerâmicas. As IEs receberam cerâmica de cobertura (Vita VM9) em toda a infraestrutura ou deixando a região gengival de conectores e pônticos exposta. As Próteses parciais fixas (PPFs) foram distribuídas em quatro grupos, de acordo com o fator “tratamento da cerâmica de infraestrutura” (4 níveis): RT - (controle) aplicação da cerâmica envolvendo toda a infraestrutura; RP - região gengival dos conectores e pônticos sem aplicação de cerâmica de cobertura; RPC - RP + jateamento da IE com partículas de alumina revestidas por sílica (30 μm) na região gengival dos conectores e pônticos (3,5 bar, 20 s, distância = 10 mm); RPOA – RP + jateamento da IE com partículas alumina (45 μm) na região gengival dos conectores e pônticos (3,5 bar, 20 s, distância = 10 mm). As próteses foram cimentadas aos pilares com cimento resinoso...
This study evaluated the effect of application of the veneering ceramic and sandblasting of the infrastructure (IE) in the gingival area of the connectors and pontic with alumina particles coated with silica and alumina particles on fracture resistance of fixed prostheses. 80 pillars were made in G10 resin (Accurate Plastics, USA), 40 with circular base diameter of 8 mm (representing a molar prepared) and 40 with circular base diameter of 6 mm (representing a premolar prepared), both with features of a full crown preparation (height 6 mm, angle: 6 ° bevel on the end off). These pillars were embedded in polyurethane resin with the aid of a metal device that standardized the distance between the bases of the pillars on 11 mm, making the models. The models were scanned, and from blocks of zirconia-based ceramic (Vita In-Ceram 2000 YZ Cubes, Vita), ceramics were prepared infrastructure. The ceramic IEs were veneered on the entire IE or leaving the gingival region of the pontic and connectors exposed. The fixed partial dentures (PPFs) were divided into four groups, according to the factor “treatment of infrastructure ceramic”(4 levels): RT - (control) veneering on the entire IE; RP - leaving the gingival region of the pontic and connectors without application of veneering ceramic; RTC - RT + IE sandblasted with alumina particles coated with silica (30 μm) in the gingival area of the connectors and pontics (3.5 bar for 20 s, distance = 10 mm); RTOA - RT + IE sandblasted with alumina particles (45 μm) in the gingival area of the connectors and pontics (3.5 bar for 20 s, distance = 10 mm). The dentures were cemented to the abutments with resin cement (Panavia F2.0, Kuraray, Japão). After 24 hours, they were subjected to mechanical... (Complete abstract click electronic access below)
This study evaluated the effect of application of the veneering ceramic and sandblasting of the infrastructure (IE) in the gingival area of the connectors and pontic with alumina particles coated with silica and alumina particles on fracture resistance of fixed prostheses. 80 pillars were made in G10 resin (Accurate Plastics, USA), 40 with circular base diameter of 8 mm (representing a molar prepared) and 40 with circular base diameter of 6 mm (representing a premolar prepared), both with features of a full crown preparation (height 6 mm, angle: 6 ° bevel on the end off). These pillars were embedded in polyurethane resin with the aid of a metal device that standardized the distance between the bases of the pillars on 11 mm, making the models. The models were scanned, and from blocks of zirconia-based ceramic (Vita In-Ceram 2000 YZ Cubes, Vita), ceramics were prepared infrastructure. The ceramic IEs were veneered on the entire IE or leaving the gingival region of the pontic and connectors exposed. The fixed partial dentures (PPFs) were divided into four groups, according to the factor “treatment of infrastructure ceramic”(4 levels): RT - (control) veneering on the entire IE; RP - leaving the gingival region of the pontic and connectors without application of veneering ceramic; RTC - RT + IE sandblasted with alumina particles coated with silica (30 μm) in the gingival area of the connectors and pontics (3.5 bar for 20 s, distance = 10 mm); RTOA - RT + IE sandblasted with alumina particles (45 μm) in the gingival area of the connectors and pontics (3.5 bar for 20 s, distance = 10 mm). The dentures were cemented to the abutments with resin cement (Panavia F2.0, Kuraray, Japão). After 24 hours, they were subjected to mechanical... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Protese dentaria parcial, Cerâmica odontológica
Como citar
CAMPOS, Fernanda. Resistência à fratura de próteses parciais fixas de zircônia: efeito da aplicação da cerâmica de cobertura e do jateamento na região gengival dos conectores e pônticos. 2012. 104 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2012.