ArticleClinical oral investigations2026
Up to 30 years of clinical performance of double-crown-retained removable dental prostheses with spark-eroded friction pins placed in a general dental practice.
Article in Clinical oral investigations, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThe purpose of this retrospective cohort study was to investigate the clinical performance and longevity of double-crown-retained removable-dental-prostheses (DCR-RDP) with spark-eroded friction pins inserted in a general dental practice and followed up over a period of 30 years. MATERIALS AND
methodsThis retrospective cohort study observed the influence of various factors on the longevity of the DCR-RDPs with spark-eroded friction pins and the abutment teeth using Kaplan-Meier estimation (log-rank test, p < .05) estimation and Cox regression (α = 0.05).
resultsDuring a mean follow-up of 14.07 ± 7.89 years (max 31.66 years), 196 prostheses and 563 abutments were observed. 30.61% (n = 60) of the prostheses and 39.43% (n = 222) of the abutments failed. The mean survival time for the prostheses was 22.66 ± 0.86 years (95% CI:20.97 to 24.24 years), and for the abutments, 20.29 ± 0.51 years (95% CI: 19.29 to 21.29 years). The following factors had a significant influence on the performance of either the prostheses or the abutment teeth: Kennedy class, number of replaced teeth, opposing dentition, number of abutments, crown-root ratio, probing depth, location, and vitality (p<.05).
conclusionsThe highest survival rates were shown by Kennedy Class III DCR-RDPs and abutment teeths, while the lowest were seen with prostheses with 11 or more replaced teeth. The number of abutment teeth, pocket depth, vitality, and crown/root length ratio should also be considered in terms of the abutment teeth's longevity.
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