Long term clinical and prosthetic outcomes of soft liner and clip attachments for bar/implant overdentures. A randomized controlled clinical trial

Abstract

Background

Long term clinical and prosthetic outcomes of soft liner attachments for bar/implant overdentures was not sufficiently investigated.

Objectives

The aim of this trial was to evaluate clinical and prosthetic outcomes of resilient liner and clip attachments for bar/implant-retained mandibular overdenture after 7 years.

Methods

Thirty edentulous male participants received 2 implants in the canine areas of the mandible. Three months later, implants were splinted with a resilient bar. Mandibular overdentures were connected to the bars with either clip (CR group, n=15) or resilient liner (RR group, n=15) attachments. Plaque index (PI), gingival index (GI), probing depth (PD), vertical bone loss (VBL), horizontal bone loss (HBLO) and prosthetic complications (PC) were evaluated at denture delivery (T0), 6 (T_6m), 12 (T1), 24 (T2), 36 (T3), 48 (T4), 60 (T5), 72 (T6) and 84 (T7) months after insertion.

Results

PI, and GI increased significantly with time for CR and decreased significantly for RR (p<.001). PD increased at T1 (CR) and T6m (RR) then decreased thereafter (p<.05). VBL increased significantly with time in both groups (p<.005). HBLO increased at T2 (CR) and T1(RR) then decreased thereafter. CR recorded significant higher PI, GI, PD, VBLO and HBLO compared to RR at all observation times (p<.042). The survival rates were 96.6% and 100% for CR and RR after 7 years. The most common PC for CR and RR were clip wears and separation of the resilient liner from the denture base respectively.

Conclusion

Within the limitations of this study, resilient liner attachments are recommended for bar/implant retained mandibular overdentures than clip attachments in terms of peri-implant tissue health and prosthetic complications after 7-years.

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