Survival rate of teeth adjacent and nonadjacent to dental implants: A retrospective cohort study

Hsuan-Hung Chen; Guo-Hao Lin; Richard T Kao; Yu-Ting Yeh

doi:10.1002/JPER.23-0739

Survival rate of teeth adjacent and nonadjacent to dental implants: A retrospective cohort study

J Periodontol. 2024 May 14. doi: 10.1002/JPER.23-0739. Online ahead of print.

Authors

Hsuan-Hung Chen^{1

2

3}, Guo-Hao Lin^{3

4}, Richard T Kao^{3

5}, Yu-Ting Yeh³

Affiliations

¹ Division of Periodontology, Department of Stomatology, Taipei Veterans General Hospital, Taipei, Taiwan.
² Department of Dentistry, School of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan.
³ Division of Periodontology, Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, California, USA.
⁴ Department of Periodontics & Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA.
⁵ Private Practice, Cupertino, California, USA.

PMID: 38742582
DOI: 10.1002/JPER.23-0739

Abstract

Background: The aim of this retrospective study was to investigate the risk of tooth loss for teeth adjacent and nonadjacent to dental implants.

Methods: A total of 787 patients with an average follow-up of 57.1 months were examined to define the tooth loss, cumulative survival rate, and odds ratio (OR) for teeth adjacent versus nonadjacent to implants. A multivariate logistic regression was employed to assess the association between dental history and various recorded etiologies of tooth loss among teeth adjacent to implants.

Results: The incidence of tooth loss for teeth adjacent to implants was 8.1% at the tooth level and 15.1% at the patient level, while 0.7% and 9.5% at the tooth and patientlevel for teeth nonadjacent to implants. The 10-year cumulative survival rate for teeth adjacent to implants was 89.2%, and the primary etiology of tooth loss was root fracture (45.2%). The risk of tooth loss among teeth adjacent versus nonadjacent to implants was significantly higher (OR 13.15). Among teeth adjacent to implants, root canal-treated teeth had a significantly higher risk of tooth loss due to root fracture (OR 7.72), a history of existing restoration significantly increased the risk of tooth loss due to caries (OR 3.05), and a history of periodontitis significantly increased the risk of tooth loss due to periodontitis (OR 38.24).

Conclusion: The present study demonstrated that after patients received dental implant treatment, teeth adjacent to implants showed a 13.2-fold higher risk of tooth loss compared to teeth nonadjacent to implants, with the primary etiology being root fracture.

Keywords: adjacent teeth; caries; complications; dental implants; survival rate; tooth loss; vertical root fracture.