THE EFFECT OF MAGNETIC AND CM LOCK ATTACHMENTS ON STRAIN AROUND IMPLANTS RETAINED MANDIBULAR OVERDENTURE: A STRESS ANALY SIS STUDY

Abstract

Objectives: This in-vitro strain gauge study was conducted to compare between magnetic andCM lock attachments regarding strain induced around two implants supporting a mandibular overdenture.Methodology: This study was performed using two implants 3.7mm x 12mm installed at thecanine area bilaterally in an acrylic model resembling a completely edentulous mandible. Pickup of the magnetic and CM loc attachments was done followed by loading and measurementsrespectively. The strain induced around the implants was evaluated during unilateral and bilateralloading at the first molar area using a universal testing machine. Measurements were tabulated andstatistically analyzed.Results: loading sides demonstrated significantly higher microstrains around the implants withthe two attachments than non-loading sides. CM LOC attachment showed significantly highermicrostrains than magnetic attachment for both loading and non-loading sides during unilateralloading. During bilateral loading, a statistically significant higher mean micro strain was recordedin the right implant than the left implant, CM lOC have shown a higher statistically significant meanmicro strain than the magnetic attachment for the right implant and no siginificant difference in theleft implant.Conclusions: Within the limitation of this in-vitro study, it could be conclude that the attachmenttype could have an effect on the amount of load that will be transmitted to the implants supportingan over denture. Clinical studies are required to evaluate the effect of type of attachment on periimplant crestal alveolar bone loss and correlate it with the results of the current study.