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Marginal and internal fit of CAD-CAM-fabricated composite resin and ceramic crowns scanned by 2 intraoral cameras.
de Paula Silveira, Alessandra C; Chaves, Sacha B; Hilgert, Leandro A; Ribeiro, Ana Paula D.
Afiliação
  • de Paula Silveira AC; Graduate student, School of Health Sciences, University of Brasília, Brasília, Brazil.
  • Chaves SB; Associate Professor, Department of Genetics and Morphology, Institute of Biology, University of Brasília, Brasília, Brazil.
  • Hilgert LA; Associate Professor, Department of Dentistry, School of Health Sciences, University of Brasília, Brasília, Brazil.
  • Ribeiro AP; Associate Professor, Department of Dentistry, School of Health Sciences, University of Brasília, Brasília, Brazil. Electronic address: apauladr@yahoo.com.br.
J Prosthet Dent ; 117(3): 386-392, 2017 Mar.
Article em En | MEDLINE | ID: mdl-27677214
STATEMENT OF PROBLEM: The precision of fit of chairside computer-aided design and computer-aided manufacturing (CAD-CAM) complete crowns is affected by digital impression and restorative material. PURPOSE: The purpose of this in vitro study was to evaluate by microcomputed tomography (µCT) the marginal and internal adaptation of composite resin and ceramic complete crowns fabricated with 2 different intraoral cameras and 2 restorative materials. MATERIAL AND METHODS: Ten extracted human third molars received crown preparations. For each prepared molar, 2 digital impressions were made with different intraoral cameras of the CEREC system, Bluecam and Omnicam. Four groups were formed: LB (Lava Ultimate+Bluecam), EB (Emax+Bluecam), LO (Lava Ultimate+Omnicam), and EO (Emax+Omnicam). Before measuring the precision of fit, all crowns were stabilized with a silicone material. Each unit (crown + prepared tooth) was imaged with µCT, and marginal and internal discrepancies were analyzed. For the 2D analysis, 120 measurements were made of each crown for marginal adaptation, 20 for marginal discrepancy (MD), and 20 for absolute marginal discrepancy (AMD); and for internal adaptation, 40 for axial space (AS) and 40 for occlusal space (OS). After reconstructing the 3D images, the average internal space (AIS) was calculated by dividing the total volume of the internal space by the contact surface. Data were analyzed with 2-way ANOVA and quantile regression. RESULTS: Regarding marginal adaptation, no significant differences were observed among groups. For internal adaptation measured in the 2D evaluation, a significant difference was observed between LO and EO for the AS variable (Mann-Whitney test; P<.008). In assessment of AIS by the 3D reconstruction, LB presented significantly lower values than the other groups (Tukey post hoc test; P<.05). Bluecam presented lower values of AIS than Omnicam, and composite resin crowns showed less discrepancy than did ceramic crowns. CONCLUSIONS: The marginal adaptations assessed in all groups showed values within the clinically accepted range. Moreover, the composite resin blocks associated with the Bluecam intraoral camera demonstrated the best results for AIS compared with those of the other groups.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cerâmica / Técnica de Moldagem Odontológica / Desenho Assistido por Computador / Adaptação Marginal Dentária / Resinas Compostas / Coroas Limite: Humans Idioma: En Revista: J Prosthet Dent Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cerâmica / Técnica de Moldagem Odontológica / Desenho Assistido por Computador / Adaptação Marginal Dentária / Resinas Compostas / Coroas Limite: Humans Idioma: En Revista: J Prosthet Dent Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos