Effect of locator abutment height on the retentive values of pink locator attachments: An in vitro study

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• 作者：Priscilla Kia Suan Sia ; BDS ; MS^a ; Radi Masri ; BDS ; MS ; PhD^b ; ^{rmasri@umaryland.edu} ; Carl F. Driscoll ; DMD^c ; Elaine Romberg ; PhD^d
• 刊名：The Journal of Prosthetic Dentistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：117
• 期：2
• 页码：283-288
• 全文大小：1271 K
• 卷排序：117

文摘

Currently, no guidelines exist to help in the selection of Locator abutments for implants at different heights.PurposeThe purpose of this in vitro study was to evaluate the effect of the differential heights of pairs of Locator abutments on the retention of overdentures after 6 months of simulated function.Material and methodsIn vitro testing was performed with 4 sets of average-sized edentulous mandible analogs with 2 implants placed in the canine positions. There were 10 specimens in each of the 4 groups, with a total sample size of 40. Four groups of 2 implant-retained overdentures were fabricated, with Locator attachments at different vertical levels with differences of 0, 2, 4, and 6 mm. The overdentures were subjected to simulated function for a period corresponding to 6 months of clinical service and then tested with a universal testing machine for changes in peak load-to-dislodgement. The data were analyzed using 1-way ANOVA followed by the Tukey honest significant differences test (α=.05).ResultsVarying the heights of Locator abutments had a statistically significant effect on the retentive values of the pink Locator attachments after 6 months of simulated function (F=7.342, P=.001). The peak load-to-dislodgement ranged from 32.3 N (95% confidence interval [CI]: 26.0 to 38.6) for group 0 mm to 53.6 N (95% CI: 46.3 to 60.8) for group 6 mm. When the difference in Locator abutment heights was 2 and 4 mm, the peak load was 37.1 N (95% CI: 32.3 to 42.0) and 41.9 N (95% CI: 31.2 to 52.7). Statistical analysis revealed that the retention of group 0 mm and group 2 mm was significantly lower than group 6 mm. The retention of group 4 mm was not significantly different from groups 0 mm, 2 mm, or 6 mm.ConclusionsAlthough significant differences were found among the groups, these differences were small and may not be clinically detectable.