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Comparing endocrown restorations on permanent molars and premolars: a systematic review and meta-analysis


Objectives The objective of this systematic review was to evaluate the success of endocrown restorations on molars in comparison with endocrown restorations on premolars.

Registration number The methodology for this review is registered with the PROSPERO database (CRD42019149543).

Data sources Medline, Embase, Dentistry & Oral Sciences Source and Cochrane CENTRAL were searched through January 2020, supplemented with hand searching of additional relevant journals.

Data selection and data extraction Two independent reviewers screened studies against predefined inclusion criteria and extracted data.

Data analysis Narrative analysis was carried out and random-effects meta-analysis was performed where possible.

Results Out of the selected eight studies, reported success rate of endocrown restoration in molars varied from 72.73% to 99.57% and in premolars ranged from 68.75% to 100%, with a follow-up range of 3-19 years. The pooled odds ratio and 95% confidence intervals for failure rates in molars compared to premolars in four studies selected for meta-analysis were 1.096 (95% CI: 0.280, 4.292).

Conclusions These findings showed similar success rates and no difference in the rate of endocrown failures between molars and premolars, thus suggesting that premolars may be considered suitable candidates for endocrowns. However, the findings should be interpreted with caution due to methodological limitations of the included studies. Further better quality and specifically designed controlled trials directly comparing the clinical performance of endocrowns on molars and premolars are required.

Key points

  • The available evidence suggests that endocrowns are a reliable alternative to post-retained restorations in molars; however, the evidence for premolars remains unclear.

  • This systematic review aimed to evaluate the evidence regarding longevity of endocrowns on both premolars and molars.

  • The results of this review indicate that there is no difference in the rate of failures between endocrowns on molars and premolars, and that premolars may potentially be considered candidates for endocrowns.

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The authors would like to acknowledge Dr Soh Hui Yuh, Lecturer, Faculty of Dentistry, National University of Malaysia, for the translation of a study from Mandarin to be used in this systematic review.

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Correspondence to Rose M. Thomas.

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This research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors. The authors do not have any conflict of interest to declare related to this study.

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Thomas, R., Kelly, A., Tagiyeva, N. et al. Comparing endocrown restorations on permanent molars and premolars: a systematic review and meta-analysis. Br Dent J (2020).

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