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Survival rate of removable partial dentures with complete arch reconstruction using double crowns: a retrospective study

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Abstract

Objectives

The purpose of this study was to clinically investigate double-crown-retained removable partial dentures (DRPDs) and abutment teeth at dental clinics.

Materials and methods

Only cases with complete arch reconstruction were included. Endpoints were replacement of denture and loss of abutment tooth. A total of 213 dentures with 1030 abutment teeth were analyzed.

Results

During the observation period, 32 dentures were replaced. The mean observation period was 12.7 (± 6.6) years (range 3 to 36). By the Kaplan-Meier method, survival rate at 10 years was 94.7% and at 20 years was 70.8%. Estimated mean survival period was 27.1 years. Cox regression analysis showed that risk factor for replacement was good occlusion as indicated by Eichner index groups A to B3 (HR 2.81). The main reason for denture replacement was loss of abutment teeth. Survival rate of abutment teeth at 10 years was 83.8% and at 20 years was 66.3%. The analysis revealed six risk factors: male gender (HR 1.76), age range 65–89 years (HR 1.51), posterior teeth (HR 1.60), higher number of present teeth in opposite jaw (HR 1.69), lower number of abutment teeth (HR 1.76), and short inner crown (HR 2.28).

Conclusion

DRPDs last over 20 years, making them a durable investment in one’s oral health; their survival is influenced by loss of abutment teeth.

Clinical relevance

In cases where there are few teeth remaining in a jaw, DRPDs represent a suitable treatment that makes use of the remaining teeth, even if the abutment teeth are non-vital.

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Acknowledgments

The authors would like to express their appreciation to the dentists, members of a clinical research organization called “Kyushikai” (meaning literally “tooth-saving organization”), who participated in this study by providing valuable data from their clinics.

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Correspondence to Koichi Yoshino.

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Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

All procedures performed in the study were in accordance with the ethical standards of the regional research ethics committee and with the 1964 Helsinki Declaration and its later amendments. This study was approved by the ethical committee of Tokyo Dental College (Approval Number 862).

Informed consent

For this type of retrospective, non-interventional clinical study, formal consent is not required. We do announce to our patients that we are conducting research about dentures in our clinics.

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Yoshino, K., Ito, K., Kuroda, M. et al. Survival rate of removable partial dentures with complete arch reconstruction using double crowns: a retrospective study. Clin Oral Invest 24, 1543–1549 (2020). https://doi.org/10.1007/s00784-019-03030-8

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  • DOI: https://doi.org/10.1007/s00784-019-03030-8

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