Análise da adaptação interna de pilares protéticos originais e multiplataformas sobre implantes

RESUMO

Atualmente, encontram-se disponíveis componentes protéticos compatíveis aos componentes originais, buscando diminuir os custos das restaurações implantossuportadas. Ainda restam dúvidas quanto à qualidade desses componentes em relação aos originais. Este trabalho avaliou a adaptação de componentes protéticos originais e multiplataformas com o auxílio de microtomografia computadorizada. Os implantes (NobelReplace Conical Connection) foram divididos em quatro grupos (n=1) – G1: componente original (Pilar Universal Base CC NP 1,5 mm); G2: componente EFF (Pilar Universal Base NP cinta 1,5 mm); G3: componente Conexão (TiBase Standard Morse Indexado NP 1,5 mm x 4,5 mm); e G4: componente Dérig (Interface NP 1,5 mm x 4,5 mm). O componente de cada grupo foi fixado com torque de 25 Ncm, de acordo com as instruções do fabricante. Foram definidas quatro regiões de interesse nas imagens para avaliar a adaptação entre os componentes. Os resultados foram então comparados estatisticamente (p=0,05) – InStat, GraphPad Software. Nas regiões 1 e 2, o grupo G3 apresentou a maior interface de conexão entre as superfícies do implante e componente protético (p < 0,05). Contudo, todos os grupos apresentaram valores elevados nessas regiões. Já nas regiões 3 e 4, localizadas na interface formada entre o parafuso do pilar protético e o próprio pilar, os grupos G1 e G2 apresentaram os maiores valores de contato entre as interfaces, em comparação com os outros grupos do estudo (p < 0,05). A adaptação na interface cônica da conexão protética foi adequada para todos os grupos avaliados no estudo. Os grupos G3 e G4 apresentaram menor superfície de contato na interface formada entre o parafuso do componente e o componente protético.

Palavras-chave – Implantes dentários; Pilares protéticos; Adaptação interna; Microtomografia computadorizada.

ABSTRACT

The use of implant-supported restorations increased the availability of prosthetic abutments for multiple platforms aiming to reduce rehabilitation costs. The quality of multiplatform prosthetic abutments remains unclear. This study used computerized microtomography (micro-CT) to analyze the misfit at the implant-abutment interface of original and multiplatform abutments. The implants (NobelReplace Conical Connection) were divided in 4 groups (n=1) – G1: original abutment (Pilar Universal Base CC NP 1.5 mm), G2: EFF abutment (Pilar Universal Base NP cinta 1.5 mm); G3: Conexão abutment (TiBase Standard Morse Indexado NP 1.5 x 4.5 mm); and G4: Dérig abutment (Interface NP 1.5 x 4.5 mm). Each prosthetic abutment was screwed to the implant with a 25 Ncm torque load, according to instructions from the manufacturer. Four regions of interest were defined in the micro-CT images to evaluate misfit. The results were statistically compared with the aid of specialized software (p=0.05) – InStat, GraphPad Software. Group G3 had the highest contact interface between implant and abutment on regions of interest 1 and 2 (p < 0.05). However, all groups in the study showed high interface contact levels at the same regions of interest. Groups G1 and G2 showed the highest contact interfaces on regions of interest 3 and 4, located at the prosthetic abutment screw and the prosthetic abutment itself (p < 0.05). The fit of the abutments and implants at the tapered interface was adequate for all groups in the study. However, groups G3 and G4 showed a limited contact interface between the abutment screw and the abutment itself.

Key words – Dental implants; Prosthetic abutments; Internal fit; Computerized microtomography.

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