Retention of bar clip attachment for mandibular implant overdenture

Abstract

Objectives The aim of the present study was to evaluate the retention and loss of retention after fatigue testing at different time intervals between two types of bar clip materials (digitally designed PEEK bar clip and regular Nylon bar clip). Materials and methods An epoxy model was constructed for a completely edentulous mandible. Two implants were placed according to prosthetically driven implant placement by a computer-guided surgical stent. Bar clips were digitally designed, 3D printed, and pressed into Poly Ether Ether Ketone (PEEK). Pick up of PEEK and nylon clips was performed on the dentures fitting surface using self-cured acrylic resin. Each study group was subjected to an insertion and removal fatigue test simulating 3 years of patient usage. Retention values were recorded using the universal testing machine at initial retention and after 1, 2, and 3 years of simulated usage. For proper sample sizing, 24 models and dentures (12 for each group) were used. An independent sample t-test and repeated measures analysis of variance were used to compare the data. Results There were statistically significant differences in retention between the PEEK and nylon bar clips at the beginning of the experiment (p = 0.000*). But after 3 years of simulated use, there was no significant difference in retention between the test groups (p = 0.055, NS). After 3 years of simulated use, the retention of PEEK clips decreased by − 58.66% recording 17.37 ± 1.07 N, while the retention of nylon clip increased by + 2.99% recording 16.56 ± 0.88 N. Conclusion The digitally designed PEEK clip showed comparable retention results to the nylon clip after 3 years of simulated use. Clinical relevance Maintenance of bar attachment with PEEK clip offers a clinical solution after the wear of normal plastic clips, which is a cheap solution that is easily fabricated and picked up into the denture. Digital fabricated PEEK bar retentive inserts can be used in cases of bar attachment wear.

Effect Of Three Different Bar Clip Materials on Retention of Implant-Supported Mandibular Overdenture: An Invitro Study

“…The advancement of digital dentistry and computer-aided design and computer-aided manufacturing (CAD-CAM) technology made the attachments and retentive inserts design simpler with nearly flawless outcomes 21 . The digitally designed PEEK bar, PEEK and zirconia clip were chosen as they might provide perfect results in implant retained overdentures.…”

“…A study evaluating the retention of these two types of bar clip materials after 3 years of simulated usage found that both materials offered good retention, with PEEK clips showing a decrease in retention by 58.66% and Nylon clips showing an increase in retention by 2.99%. Overall, the materials used for the construction of clips in bar-retained mandibular overdentures can vary, but both PEEK and Nylon have been shown to offer good retention for up to 3 years of use 20,21 .…”

“…On reviewing the literature, rare studies explored the effect of using different clip materials on the retention of PEEK bar retained implant assisted overdenture 21,25 . Hence this research work was proposed to compare different clip materials with bar attachments and determine which could provide better retention with PEEK bar retained implant assisted overdenture.…”

Effect of different fabrication workflows on the passive fit of screw-retained bar splinting two interforaminal implants: a parallel blinded randomised clinical trial

“…Inter group comparison of both situations was done as well. Pick up of the bar clips in the reinforced over denture base was made using autopolymerizing acrylic resin [ 38 ].…”

The optimal design and three-dimensional finite element analysis of CAD/CAM integrated roach attachment

“…The importance of attachment design and manufacturing material selection cannot be overstated, as the use of attachments with suboptimal design or inappropriate materials can result in reduced retention and negatively impact periodontal support tissues [ 11 , 12 ]. Notably, the addition of clasp arms to movable dentures may enhance retention force, but requires experimental investigation to determine appropriate prosthetic materials and to obtain guidance for clinical design through experimental research.…”