Uludag Bulent, Polat Serdar, Sahin Volkan, Çomut Ali Alper
Int J Oral Maxillofac Implants. 2014 Sep-Oct;29(5):1053-7. doi: 10.11607/jomi.3401.
The aim of this study was to evaluate the effects of different implant angulations and attachment configurations on the retentive forces of locator attachment-retained overdentures over a simulated time period of 6 months.
Two acrylic resin models (models 1 and 2) were fabricated to represent an edentulous mandible. In model 1, the midline implant (in the central region) was vertical and the other two implants (in the canine regions) were 20 degrees divergent from the midline, reaching a total divergence of 40 degrees. In model 2, all three implants were vertically oriented, perpendicular to the occlusal plane and parallel to each other. Three-point vertical pull-out forces were employed in a universal testing machine at a constant crosshead speed of 50 mm/min after overdenture construction and a simulation of 6 months of repeated insertions/removals of the overdenture. Locator attachments with different male combinations and bar and clip attachments were tested in model 1. Clear locator attachments and bar and clip attachments were tested in model 2 and served as controls.
The initial retentive forces of all attachments in both models ranged from 26.58 to 62.05 N, whereas the initial retentive forces of the attachments for only model 1 ranged from 49.58 to 62.05 N. The highest retention value was recorded for clear green locator attachments and the lowest for hader bar yellow clip attachments. Locator attachments showed higher retention values than hader bar yellow clip attachments.
All attachment systems demonstrated a decrease in retention over time. Locator attachments provided better retention than hader bar yellow clip attachments. The highest retention values were obtained when green male locators were used in combination with male attachments.
本研究旨在评估在模拟6个月的时间段内，不同种植体角度和附着结构对Locator附着式覆盖义齿固位力的影响。
制作两个丙烯酸树脂模型（模型1和模型2）以代表无牙下颌。在模型1中，中线种植体（位于中央区域）垂直，另外两个种植体（位于尖牙区域）与中线呈20度发散，总发散度为40度。在模型2中，所有三个种植体均垂直定向，垂直于咬合平面且相互平行。在覆盖义齿制作完成并模拟覆盖义齿6个月的反复插入/取出后，在万能试验机上以50 mm/min的恒定十字头速度施加三点垂直拔出力。在模型1中测试了具有不同阳型组合的Locator附着体以及杆卡附着体。在模型2中测试了透明Locator附着体以及杆卡附着体，并作为对照。
两个模型中所有附着体的初始固位力范围为26.58至62.05 N，而仅模型1中附着体的初始固位力范围为49.58至62.05 N。透明绿色Locator附着体的固位值最高，而Hader杆黄色夹子附着体的固位值最低。Locator附着体的固位值高于Hader杆黄色夹子附着体。
所有附着系统的固位力均随时间下降。Locator附着体比Hader杆黄色夹子附着体提供更好的固位。当绿色阳型Locator与阳型附着体组合使用时，可获得最高的固位值。
