Adaptação marginal de restaurações de cerâmica e resina composta de laboratório / Marginal adaptation of laboratory, composite resin and porcelain restauration

RESUMO

O objetivo desta pesquisa foi comparar a adaptacao marginal entre restauracoes de ceramica feldspatica (Noritake) e duas resinas compostas de laboratorio (Artglass e Targis). Analisou-se, atraves da microscopia optica, a magnitude da fenda marginal nas faces mesial, distal e lingual. Um pre-molar superior foi preparado para receber uma restauracao do tipo onlay MOD com cobertura da cuspide lingual. A partir deste elemento, foram confeccionadas 30 replicas em NiCr divididas em 3 grupos l) Noritake; ll) Artglass; lll) Targis. As restauracoes foram posicionadas em suas respectivas replicas e observadas ao microscopio optico (40X), conectado a um microcomputador. As imagens foram capturadas atraves do software Microsoft VidCap 32 e as fendas medidas com auxilio de um cursor de distancia (software Imagelab 2000). As medias (â sm) obtidas foram grupo l) mesial 64,50 (+38,26), lingual 47,50 (+35,69) e distal 53,00 (+29,36); grupo ll) mesial 56,00 (+25,03), lingual 35,50 (+25,65) e distal 56,00 (+19,55); grupo lll) mesial 69,50 (+9,56), lingual 53,00 (+20,44) e distal 55,50 (+29,29). A analise de variancia de dois fatores (face e material) demonstrou que nao houve diferencas significantes entre os materiais estudados (5%). Entretanto, foram encontradas diferencas significantes entre as faces e foi, entao, aplicado o teste de Tukey (5%). As medias (µm) encontradas foram mesial 63,33, distal 54,33 e lingual 45,33. Conclusoes: nao houve diferenca significante entre a adaptacao marginal dos materiais estudados (Noritake, Artglass e Targis). A face mesial presentou maior fenda, quando comparada a lingual.

ABSTRACT

The objective of this research was to compare the marginal adaptation between feldspatic ceramic (Noritake) and two laboratory composite resins (Artglass and Targis). The magnitude of the marginal fissure in the mesial, distal and lingual faces was analyzed through optical microscopy. An upper pre-molar was prepared to receive an onlay restoration covering lingual cuspid. Starting from this element, 30 replicas were made in NiCr, and divided into 3 groups l) Noritake; ll) Artglass; lll) Targis. Restorations were positioned in their respective replicas and observed through optical microscope (40X) connected to a microcomputer. The images were captured by a Microsoft VidCap 32 software and the fissures measured with the aid of a distance cursor (Imagelab 2000 software). The averages (ìm) obtained were group l) mesial 64,50 (+38.26), lingual 47.50 (+35.69) and distal 53.00 (+29.36); group ll) mesial 56.00 (+25.03), lingual 35.50 (+25.65) and distal 56.00 (+19.55); group lll) mesial 69.50 (+9.56), lingual 53.00 (+20.44) and distal 55.50 (+29.29). The results, through the Two-factor Analysis of Variance (face and material), demonstrated that there were no significant differences among the studied materials. However, significant differences were found among the faces, then, it was applied the TukeyÆs test (5%). The averages (µm) found were mesial 63.33, distal 54.33 and lingual 45.33. Conclusions: there was no significant difference among the marginal adaptation of the studied materials (Noritake, Artglass and Targis). Mesial faces presented larger fissures when compared to the lingual faces.