| ORIGINAL ARTICLE |
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| Year : 2022 | Volume
: 14
| Issue : 1 | Page : 7-15 |
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In vitro evaluation of cyclic loading on retention strength of Retention.sil and O/ring attachments for tooth supported overdenture
Raadhikka Karthhik, Bharath Raj, GP Surendra Kumar
Department of Prosthodontics, V.S. Dental College and Hospital, Bengaluru, Karnataka, India
Correspondence Address:
Raadhikka Karthhik
#13, 6th C Cross, Sairam Layout, Attur, Yelahanka, Bengaluru - 560 064, Karnataka
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/jorr.jorr_40_21
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Statement of Problem: Numerous different attachments are used to retain overdentures. Hence, there is a need to assess new chairside attachment system based on polyvinylsiloxane (Retention.sil [R.S]) to know its in vitro behavior to be used clinically.
Purpose: To assess and compare the retentive force of two female matrix retention system (R.S with a conventional O-ring [OR] attachment system) in tooth-supported overdenture.
Materials and Methods: Completely edentulous mandibular model with two canine root-anchored ball attachments for overdentures were fabricated. A total of 30 mandibular dentures were made and divided to form two groups, each with a different attachment design. One group (test) received 5 pairs of R.S attachments while the other group (control) received 15 pairs of ORs. Retention force was measured by subjecting them to 540 cycles of insertion and de-insertion cycles (representing 6 months functional life) in axial direction before and after thermocycling.
Results: Statistical analysis comprised Kolmogorov–Smirnov test, Friedman test, and Wilcoxon signed-rank test (α = 0.05). The initial retention of R.S attachments was 5.90 ± 0.77 N and of ball/OR 17.36 ± 3.81 N. The final retention of R.S attachments was 5.41 ± 0.72 N and of ball/OR 12.91 ± 3.18 N. The OR developed higher retentive force as compared to the R.S attachments (P < 0.05). However, no significant changes in retention force were observed for R.S groups after repeated dislodging and thermal undulation.
Conclusion: Both systems presented acceptable retention capacities after 540 cycles. The newly developed R.S attachments can provide an alternative to OR attachments for short-term retention. Clinical studies are however required to elucidate the long-term performance of these materials.
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