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Influence of conventional and digital intraoral impressions on the fit of CAD/CAM-fabricated all-ceramic crowns

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Abstract

Objectives

To compare the fit of all-ceramic crowns fabricated from conventional silicone impressions with the fit of all-ceramic crowns fabricated from intraoral digital impressions.

Methods

Thirty patients with 30 posterior teeth with a prosthetic demand were selected. Zirconia-based ceramic crowns were made using an intraoral digital impression system (Ultrafast Optical Sectioning technology) (digital group, D) and 2-step silicone impression technique (conventional group, C).

To replicate the interface between the crown and the preparation, each crown was cemented on its corresponding clinical preparation using ultra-flow silicone. Each crown was embedded in resin to stabilize the registered interface. Specimens were sectioned in buccolingual orientation, and internal misfit was measured at different areas using stereomicroscopy (×40).

Data was analysed using Student’s t test and Mann-Whitney test (α = 0.05).

Results

No statistically significant differences were found (P > 0.05) between two groups. The mean internal misfit and mean marginal misfit were 170.9 μm (SD = 119.4)/106.6 μm (SD = 69.6) for group D and 185.4 μm (SD = 112.1)/119.9 μm (SD = 59.9) for group C.

Conclusion

Ceramic crowns fabricated using an intraoral scanner are comparable to elastomer conventional impressions in terms of their marginal and internal fits. The mean marginal fit in both groups was within the limits of clinical acceptability.

Clinical significance

Impressions based on Ultrafast Optical Sectioning technology can be used for manufacturing ceramic crowns in a normal workflow, with the same results as silicone conventional impressions.

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Acknowledgments

This project was partially supported by a grant from Phibo Dental Solutions S.L. This manuscript has not been published and is not consideration for publication elsewhere. All authors have approved the manuscript and agree with its submission.

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Correspondence to S. Berrendero.

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Berrendero, S., Salido, M.P., Valverde, A. et al. Influence of conventional and digital intraoral impressions on the fit of CAD/CAM-fabricated all-ceramic crowns. Clin Oral Invest 20, 2403–2410 (2016). https://doi.org/10.1007/s00784-016-1714-6

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  • DOI: https://doi.org/10.1007/s00784-016-1714-6

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