Effect of Accelerating Aging on Retention and the Release Period of Clips in a Bar Retained Maxillary Implant Overdenture

Dalia El Naggar,Ahmed Mohamed Alam-Eldein,Maha Mostafa Halim,Hoda Mohammed Amin Rashad

doi:10.15342/ijms.2021.385

Abstract

Objectives: This study was made to detect the effect of accelerating aging on retention and measuring the release period of clips in a 2 and 3 bar retained maxillary implant overdenture. Materials and Methods: Four implants were placed in two maxillary edentulous epoxy models. One model had two bar attachments with two clips overdenture while the other model had three bar attachments with three clips in the overdenture. Retention and release period of the clips were checked before applying insertion removal cycles. Retention was measured using a universal testing machine after 540 cycles (6 months) and 1080 cycles (1 year) of insertion removal on a chewing simulator.Results and Conclusions: There was a significant difference in retention and release period between two bars and three bars implant retained maxillary overdentures. A significant difference was also seen in each group after accelerated aging. Therefore, the three bar implant retained overdenture had higher retention values than two bar. Retention loss occurred in both groups after the insertion removal cycles. Release period value was lower in two bar overdenture than three bar overdenture.

Highlights

Implants in the maxillary arch are distributed according to the size, curvature and shape of the ridges which may influence their survival due to forces acting on the prosthesis in the maxilla[1]
A-Release Period There was a significant difference between group I (2 bar attachment) and group II (3 bar attachment)
In Petropoulos study, one round gold bar attached to two implants was used with a single metal clip that was activated by the operator, while in the current study two types of CoCr round bar designs supported on four implants were used with different number of plastic clips

Summary

Introduction

Implants in the maxillary arch are distributed according to the size, curvature and shape of the ridges which may influence their survival due to forces acting on the prosthesis in the maxilla[1]. In Slot et al.[2] the best design observed for about a one year period for the maxillary overdenture is four implants with equal distance, and in case of compromised bone six implants were recommended. Implants that are splinted by a bar attachment are even more acceptable as they provide load distribution by sharing the occlusal load between the implants[3]. In bar retained implant maxillary overdenture absence of anterior bar provides a better anterior aesthetics and better oral hygiene of the patient [6]

Objectives

Methods

Results

Conclusion