Comparison of the Retention of Conventional and Polyvinyl Siloxane Matrix Materials with Different Patrices for Implant-Retained Overdentures: An In Vitro Study

Yilmaz E., Gencel B., Geckili O., Sakar O.

INTERNATIONAL JOURNAL OF PROSTHODONTICS, vol.35, no.3, pp.311-318, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.11607/ijp.6882
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, CINAHL, EMBASE, MEDLINE, DIALNET
  • Page Numbers: pp.311-318
  • Istanbul University Affiliated: Yes


Purpose: To compare the retention forces of implant overdenture patrices (ball, bar, and TiSi.snap) to conventional (O-ring, metal housing, and plastic clip) and polyvinyl siloxane (PVS)-based silicone (Retention. sil 200, 400, and 600; Mucopren Soft; and GC Reline Soft) matrix materials. Materials and Methods: Two implant analogs in which the patrices were to be placed were embedded parallel to each other in polyethylene blocks, and the matrices were placed in heat-polymerized acrylic blocks that were fabricated as overdentures. Ten samples were prepared for each attachment type, and 180 samples were obtained from 18 groups. All samples were placed in a chewing simulator for occlusal force application and for insertion and removal of the pieces. Retention measurements were performed with a universal testing device at the initial (10 cycles), simulated first-year (1,825 cycles), and simulated second-year (3,650 cycles) periods, assuming that the patients would insert and remove their overdenture five times daily. Results: Loss of retention occurred in all of the attachment systems at the end of 3,650 cycles (P < .05). The PVS matrix materials showed less retention than the O-ring and metal matrices when a ball patrix was used, while they had higher retention than clips when the Hader bar patrix was used (P < .05). Among the PVS matrix materials, Retention.sil 200 produced the lowest retention values, whereas Retention.sil 600 generated the highest. Conclusion: PVS matrix materials showed higher retention than achieved by yellow plastic bar matrices; however, these materials exhibit lower retention than plastic and metal matrices with ball abutments.