Retention Of Mandibular Implant Supported Overdentures Using CM-LOC And Locator Attachment Systems: A Randomized In Vitro Study

Document Type : Original Article

Authors

1 Department of Removable prosthodontics , faculty of oral & Dental Medicine , Giza, Cairo

2 Department of Removable prosthodontics, faculty of oral & Dental Medicine, Giza ,Cairo

3 Department of Removable prosthodontics , faculty of oral & Dental Medicine , Giza, Cairo

Abstract

Aim: The present study was carried out to compare the retention of two different types of attachments used to retain single implant supported mandibular overdenture. The two attachments used in this study were Locator and Cendres and Meteaux Locator (CM-LOC).

Methods: An epoxy model of edentulous mandible was constructed and prepared to receive single implant in the midline area by installing the implant analogue orthogonally using surveyor in the stone model then a silicone mould created to be poured with the epoxy resin. Ten overdentures were constructed, randomization was carried out each five models will be allocated into two groups. five containing PEKK matrix in Group A and other containing Nylon matrix in Group B. Pick up for both groups was carried out using self cured acrylic resin under hand pressure. Then retention for both groups was initially measured at baseline using universal testing machine and then the overdentures in both groups were subjected to different chewing cycles 500, 100, 1500 and 2000 cycle. Retention was measured after each cycle for both attachments.


Results: There was no Statistical significant difference between two groups except for retention after 500 cycles (3 months) (p-value=0.048). CM LOC group showed higher initial mean values compared with Locator group. Both attachment systems showed a significant decrease in retention over time.

Conclusion : Both attachments have shown a decrease in retention when subjected to different chewing cycles , The CM-LOC attachment has shown significant better retention when compared to Locator attachment after 500 cycles .

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2211-2221

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