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The influence of the cavity preparation design on marginal accuracy of laboratory-processed resin composite restorations

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Abstract

The aim of this study was to evaluate the influence of different cavity preparation designs on marginal accuracy of laboratory-processed resin composite restored teeth. Eighty mandibular human third molars were selected. There were two experimental factors, occlusal isthmus width (narrow vs wide) and cuspal coverage (inlay, one-cusp onlay, two-cusp onlay, and all-cusp onlay), resulting on eight groups (N = 10). Indirect composite restorations (SR Adoro, Ivoclar-Vivadent) were manufactured and positioned over each respective preparation. Marginal accuracy evaluation was accomplished using a stereomicroscope at three points on buccal, lingual, mesial, and distal regions with 40× magnification. The results showed significant differences (P = 0.00) with wide inlay showing the best overall marginal accuracy and narrow inlay the worst one. Two-way analysis of variance (ANOVA) showed significant differences when considering the factor occlusal isthmus width (P = 0.00). In general, preparations with wide occlusal isthmus presented better results than narrow ones, except for wide all-cusp onlays; however, the test failed to show differences when considering the cuspal coverage (P = 0.42) or the interaction between both factors (P = 0.30). The effect of occlusal width extension on marginal accuracy of indirect composite resin restorations is significant, with lower values of gaps width in wide preparations, but since in a clinical situation this would mean greater removal of sound tooth structure, less-aggressive preparations combined with other restorative procedures seem to be more feasible.

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Acknowledgements

Authors are grateful to Dentsply and KG Sorensen for full donation of the materials used in this study, and to Ivoclar-Vivadent for partial donation.

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Authors and Affiliations

  1. Department of Dental Materials, Piracicaba Dental School, University of Campinas, Campinas, Brazil

    Rodrigo Borges Fonseca & Lourenço Correr-Sobrinho

  2. Department of Occlusion and Fixed Prosthodontics, Dental School, Federal University of Uberlândia, Uberlândia, Brazil

    Alfredo Júlio Fernandes-Neto

  3. Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia, Uberlândia, Brazil

    Paulo Sérgio Quagliatto & Carlos José Soares

  4. Departamento de Dentística e Materiais Odontológicos, Faculdade de Odontologia, Universidade Federal de Uberlândia, Av. Pará, n° 1720, Campus Umuarama, Bloco 2B, Sala 2B-24, CEP 38405-902, Uberlândia, Minas Gerais, Brazil

    Carlos José Soares

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  1. Rodrigo Borges Fonseca
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  2. Lourenço Correr-Sobrinho
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  3. Alfredo Júlio Fernandes-Neto
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  4. Paulo Sérgio Quagliatto
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Correspondence to Carlos José Soares.

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Fonseca, R.B., Correr-Sobrinho, L., Fernandes-Neto, A.J. et al. The influence of the cavity preparation design on marginal accuracy of laboratory-processed resin composite restorations. Clin Oral Invest 12, 53–59 (2008). https://doi.org/10.1007/s00784-007-0145-9

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  • DOI: https://doi.org/10.1007/s00784-007-0145-9

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