Türk Pinar Eren, Geckili Onur, Türk Yasin, Günay Volkan, Bilgin Tayfun
Int J Oral Maxillofac Implants. 2014 Sep-Oct;29(5):1106-13. doi: 10.11607/jomi.3621.
To compare the retentive properties of ball and locator attachments during 5,000 insertion-separation cycles, corresponding to approximately 4.5 years of clinical use.
Four dental implants (diameter, 3.8 mm; length, 12 mm) were inserted into the prepared beds of two polyethylene blocks. Twenty acrylic prosthetic components were fabricated and connected to the ball and locator abutments. Tensile force was applied to the prosthetic components until the attachments were separated from the abutments. All samples were subjected to 5,000 insertion-separation cycles. Retention forces were measured after 10, 100, 200, 300, 400, 500, 1,000, 1,500, 2,000, 3,000, 4,000, and 5,000 insertion-separation cycles. Additionally, the wear of the attachments was measured using scanning electron microscopy. Data were analyzed to determine statistical equivalence among the two different attachments using the Student t test procedure and the Mann-Whitney U test procedure (α = .05).
Ball attachments showed significant retention loss after 100, 200, 400, 500, 1,500, and 4,000 cycles, and the locator attachments showed significant retention loss after 100, 200, 300, 500, and 3,000 cycles as compared with the previous cycle (P < .05). Retention loss after 5,000 cycles was detected significantly more often for ball attachments than for locator attachments (P = .049). No significant difference was detected between the retention losses of the two attachment systems during the other cycles as compared with the initial retention values (P > .05). No significant difference was detected between the wear on the two attachment systems after 5,000 cycles (P > .05).
Both attachment systems showed decreased retentive forces after 5,000 insertion-separation cycles. However, after 5,000 insertion-separation cycles, locator attachments showed better retentive properties than ball attachments.
比较球型附着体和定位器附着体在5000次插入 - 分离循环（相当于约4.5年临床使用）过程中的固位性能。
将4枚牙种植体（直径3.8 mm；长度12 mm）植入两块聚乙烯块制备好的牙槽窝内。制作20个丙烯酸树脂修复部件，并连接到球型基台和定位器基台上。对修复部件施加拉力，直至附着体与基台分离。所有样本均进行5000次插入 - 分离循环。在10、100、200、300、400、500、1000、1500、2000、3000、4000和5000次插入 - 分离循环后测量固位力。此外，使用扫描电子显微镜测量附着体的磨损情况。采用学生t检验程序和曼 - 惠特尼U检验程序（α = 0.05）对数据进行分析，以确定两种不同附着体之间的统计学等效性。
与前一循环相比，球型附着体在100、200、400、500、1500和4000次循环后出现显著的固位力损失，定位器附着体在100、200、300、500和3000次循环后出现显著的固位力损失（P < 0.05）。5000次循环后，球型附着体的固位力损失显著高于定位器附着体（P = 0.049）。与初始固位值相比，在其他循环中，两种附着体系统的固位力损失无显著差异（P > 0.05）。5000次循环后，两种附着体系统的磨损情况无显著差异（P > 0.05）。
两种附着体系统在5000次插入 - 分离循环后固位力均下降。然而，在5000次插入 - 分离循环后，定位器附着体比球型附着体表现出更好的固位性能。
