In vitro study of marginal, internal and proximal adaptation of implant-supported single-crown CAD/CAM restorations


  • Kamila Aguiar Figueiredo Alves School of Medicine and Public Health of Bahia
  • Janaina Emanuela Damasceno University of Campinas
  • Viviane Maia Barreto de Oliveira School of Medicine and Public Health of Bahia
  • Luiz Gustavo Cavalcanti Bastos School of Medicine and Public Health of Bahia
  • Andrea Nóbrega Cavalcanti School of Medicine and Public Health of Bahia



Ceramics, Computer-aided design, Crowns, Data accuracy


Aim: This study evaluated the precision of a CAD/CAM system by measuring marginal, internal and proximal fits in implantsupported single-crown restorations. Methods: Ten models of the upper arch were made in which implants replaced the upper left premolars. For fabrication of the zirconia infrastructures, titanium bases (TiBase) were coded and scanned using a scan body. A second digital impression was made for the fabrication of prostheses. Silicone impression material was used to determine the internal clearance between the TiBase and infrastructure and between the infrastructure and crown, whose thickness was measured at three points [P1 (cervical), P2 (middle) and P3 (occlusal)] with a stereoscopic microscope at 70x and 100x magnification. One-way ANOVA for repeated measures and the Student t-test were used for the analysis of internal and marginal adaptation. Proximal contacts were analyzed qualitatively. Results: There was no significant difference between the teeth evaluated (Student’s t-test; p>0.05) or between the corresponding points evaluated in either tooth (one-way ANOVA; p>0.05). Analysis of the internal clearance between the infrastructure and crown demonstrated that all points were significantly different compared to the reference standardized at 100 μm (Student’s t-test p<0.0001). There was no significant difference between P1 and P2, with the thickness at these two points being lower than that obtained at P3 (one-way ANOVA, p<0.05). The proximal contacts did not coincide with the quality defined by the device. Conclusion: The system tested was unable to produce implantsupported single-crown ceramic restorations with marginal, internal and proximal fits matching the digital workflow, with the inferior fits requiring adjustment prior to cementation.


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Author Biographies

Kamila Aguiar Figueiredo Alves, School of Medicine and Public Health of Bahia

Dentistry Course, School of Medicine and Public Health of BaDentistry Course, School of Medicine and Public Health of Bahia (BAHIANA), Salvador, BA, Brazil

Janaina Emanuela Damasceno, University of Campinas

Piracicaba Dental School, University of Campinas (UNICAMP). Piracicaba, SP, Brazil.

Viviane Maia Barreto de Oliveira, School of Medicine and Public Health of Bahia

Adjunct Professor. Dentistry Course, School of Medicine and Public Health of Bahia (BAHIANA) and School of Dentistry, Federal University of Bahia (FOUFBA). Salvador, BA, Brazil.

Luiz Gustavo Cavalcanti Bastos, School of Medicine and Public Health of Bahia

Adjunct Professor. Dentistry Course, School of Medicine and Public Health of Bahia (BAHIANA) and School of Dentistry, Federal University of Bahia (FOUFBA). Salvador, BA, Brazil.

Andrea Nóbrega Cavalcanti, School of Medicine and Public Health of Bahia

Adjunct Professor. Dentistry Course, School of Medicine and Public Health of Bahia (BAHIANA) and School of Dentistry, Federal University of Bahia (FOUFBA). Salvador, BA, Brazil.


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How to Cite

Alves KAF, Damasceno JE, Oliveira VMB de, Bastos LGC, Nóbrega Cavalcanti A. In vitro study of marginal, internal and proximal adaptation of implant-supported single-crown CAD/CAM restorations. Braz. J. Oral Sci. [Internet]. 2020 Aug. 27 [cited 2022 Nov. 29];19:e207286. Available from:

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