Effect of implant angulation and patrice on the retention of overdenture attachment systems: An in vitro study.

Within the limitations of this study, implant angulations up-to 15 degrees do not affect differential change in retention of Novaloc® patrices. There is no difference between Novaloc® white inserts (light retention value) and green inserts (strong retention values) when implants diverge up-to 15-degrees. When Novaloc® straight abutments were placed on implants diverging by 30-degrees, blue extra-strong retention inserts outperformed yellow medium retention inserts by maintaining a higher retention value after 30,000 cycles. When utilizing Novaloc® 15-degree angulated abutments that correct the overall implant angulation to zero degrees, the red light retentive patrice provides steady retention. Finally, the Locator®-green patrice system provides greater retention than the comparable Novaloc®-blue patrice combination; however, it also loses more retention after 30,000 cycles. This article is protected by copyright. All rights reserved.