Dalia Mostafa El Naggar* and Ahmed Mohamed Alam-Eldein
Department of Removable Prosthodontics, Tanta University, Tanta, EgyptFulltext PDF
Objectives: This study was made to compare retention values and detect surface changes of clips in full and partial palatal coverage of bar retained maxillary implant overdenture at initial, 6 month and 1 year after insertion removal cycles. Materials and Methods: Four implants were placed at the canine and 2nd premolar region in a maxillary edentulous epoxy model using a guiding stent. Three bar attachments along with their metal housing were performed, and the clips were inserted in the metal housing. Partial and full palatal coverage overdenture was prepared, each with 2 metal housing. Retention value and initial photo of the clips were recorded before applying insertion removal cycles. Retention was measured using universal testing machine after 540 cycles (6 months) and 1080 cycles (1 year) of insertion removal on a chewing simulator and the clips were observed under the microscope using the scanning electron microscope. Results and Conclusion: There was an insignificant difference in retention between full and partial palatal coverage of implant retained maxillary overdentures. A significant difference was seen in each group independently as retention decreases over time. No difference was detected between the 2 groups initially, after 6 month, and after 1 year. Surface changes and wear were detected when comparing the 6 month and 1 year photos with the initial.
Bar attachment; Clips; Retention; Wear; Implant
El Naggar DM, Alam-Eldein AM. Comparative Study of Retention and Wear between Full and Partial Palatal Coverage of Bar Retained Maxillary Implant Overdenture. J Dent Oral Biol. 2021; 6(2): 1180. ISSN: 2475-5680.