Thermocycling Effect on Implant Supported Overdenture Using 3D printed Peek Bar following all-on-4 Concept: Randomized Trial-In vitro Study

Abstract

Objective: Stress analysis and retention evaluation of implant-retained mandibular complete overdenture with different clip materials and distributions. Methods: This in-vitro study was conducted over implants retained mandibular complete overdenture (all-on-4 concept) using BIOHPP bar attachments constructed using 3 D printing with different clip materials and distributions. This study consisted of 4 groups according to the type and distribution of clips: Group I: hard clips anteriorly and posteriorly, Group II: soft clips anteriorly and posteriorly, Group III: hard clips anteriorly and soft clips posteriorly, and Group IV: soft clips anteriorly and hard clips posteriorly. Stress analysis and retention were evaluated before and thermocycling afterward. Results: Comparison between stresses in each group before and after thermocycling in central and peripheral implants was performed, revealing stresses in all groups after thermocycling were significantly higher than before thermocycling as P < 0.05. Regarding retention, a comparison between all groups revealed a significant difference between them before and after thermocycling as P<0.05. Conclusion:There is no effect of clip material distribution regarding stress analysis and retention before and after thermocycling except stresses in central implant before thermocycling as soft clips anteriorly and hard clips posteriorly revealed significant lower stresses than hard clips anteriorly and soft clips posteriorly.

Evaluation of Marginal Bone Height Changes in implant-supported mandibular overdenture retained with Two Different Materials of Bar Attachments.

“…However, the rest of the aspects showed no significant difference. The crestal bone loss that occurred during the follow up period may be due to surgical trauma during drilling, the remodeling process post implant insertion and/or due to occlusal loading (35,36) The present study's results revealed that; there was a gradual increase in the maximum biting force in patients rehabilitated by implant overdentures in the two studied groups throughout study period. This finding may be due to many reasons; the gradual rise in the maximum bite force may be due to the neuromuscular co-ordination and adaptability of the patient to the prostheses upon time; however it was reported that implant supported prostheses may restore the oral function successfully, both subjective and objective indicators of chewing ability score better compared to conventional complete dentures; more over the refined stability and retention provided by the implants may have lowered patient's fear and promoted them to exert higher biting force.…”

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

“…In an invitro investigation over implants held mandibular complete overdentures (all-on-4 concept) utilizing BioHPP and metal bar attachments, it was discovered that after thermocycling, the retention force of BioHPP bar attachment was much higher than the retention force of metal bar attachment. The BioHPP bar attachment overdentures may be a preferable choice for patients looking for greater retention force and resilience to cyclic loading 14 The bars in implant overdentures are conventionally constructed utilizing the lost-wax method casting method, which is labor-intensive and time-consuming. Construction of one-piece casted bar attachment are frequently faced with difficulties such as probable porosities and misfits 15 .…”