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- Title
Influence of different lubricants on the retentive force of LOCATOR<sup>®</sup> attachments - an in vitro pilot study.
- Authors
Srinivasan, Murali; Schimmel, Martin; Kobayashi, Mariko; Badoud, Isabelle; Ammann, Patrick; Herrmann, François R.; Müller, Frauke
- Abstract
Objective The aim of this in vitro pilot study was to evaluate the influence of an artificial saliva ( AS) lubricant on the retentive force of a stud-type attachment ( LOCATOR®) for implant overdentures ( IODs). Methods Twenty custom-made models simulating a two- IOD with parallel implant situation were fabricated using LOCATOR® attachments. The in vitro testing was carried out with an Instron® universal testing machine for a total of 10,000 insertion-removal cycles, for each model, in two different aqueous test mediums (Group 1: 0.9% sodium chloride solution (NaCl), n = 10; Group 2: AS, n = 10). Changes in the mean retentive force ( F) were plotted against the cycle numbers #10, #100, #1000, #5000, and #10,000. Mixed regression models were applied for statistical analyses. Results A mixed regression (not considering interactions) predicted, compared to cycle #10, higher retentive forces at cycles #100 ( P < 0.0001), #1000 ( P = 0.017), similar forces at #5000 ( P = 0.277), and lower forces at #10,000 ( P = 0.012); there was no overall effect of the medium ( P = 0.159). A second statistical model, employing the interaction term 'cycle##medium', confirmed similarly the effect. Although the interaction term was significant at cycle #100 ( p = 0.045), there was no significant difference between the two groups ( P = 0.140). Conclusion In this in vitro pilot experiment, there was no difference in mean retentive forces of the LOCATOR® attachments when tested with either 0.9% NaCl or a Glandosane®-like artificial saliva lubricant. A larger scale study may still confirm the superiority of either lubricant for quasiclinical bench experiments.
- Subjects
DENTAL implants; DENTAL technology; ARTIFICIAL saliva; OVERLAY dentures; LUBRICATION &; lubricants research
- Publication
Clinical Oral Implants Research, 2016, Vol 27, Issue 7, p771
- ISSN
0905-7161
- Publication type
Article
- DOI
10.1111/clr.12680