PDF(Pubmed)
Abstract：
OBJECTIVE: The stability of the abutment screw is pivotal for successful implant-supported restorations, yet screw loosening remains a common complication, leading to compromised function and potential implant failure. This study aims to evaluate the effect of different implant-abutment types and heights on screw loosening in cases with increased crown height space (CHS).
METHODS: In this in vitro study, a total of 64 abutments in eight distinct groups based on their type and height were evaluated. These groups included stock, cast, and milled abutments with heights of 4 mm (groups S4, C4, and M4), 7 mm (groups S7, C7, and M7), and 10 mm (groups C10 and M10). Removal torque loss (RTL) was assessed both before and after subjecting the abutments to dynamic cyclic loading. Additionally, the differences between initial RTL and RTL following cyclic loading were analyzed for each group (p < .05).
RESULTS: The C10 group demonstrated the highest RTL, whereas the S4 group exhibited the lowest initial RTL percentage (p < .05). Furthermore, the study established significant variations in RTL percentages and the discrepancies between initial and postcyclic loading RTL across different abutment groups (p < .05). Additionally, both abutment types and heights were found to significantly influence the RTL percentage (p < .05).
CONCLUSIONS: The type and height of the implant abutment affected screw loosening, and in an increased CHS of 12 mm, using a stock abutment with a postheight of 4 mm can be effective in minimizing screw loosening.
METHODS: In this in vitro study, a total of 64 abutments in eight distinct groups based on their type and height were evaluated. These groups included stock, cast, and milled abutments with heights of 4 mm (groups S4, C4, and M4), 7 mm (groups S7, C7, and M7), and 10 mm (groups C10 and M10). Removal torque loss (RTL) was assessed both before and after subjecting the abutments to dynamic cyclic loading. Additionally, the differences between initial RTL and RTL following cyclic loading were analyzed for each group (p < .05).
RESULTS: The C10 group demonstrated the highest RTL, whereas the S4 group exhibited the lowest initial RTL percentage (p < .05). Furthermore, the study established significant variations in RTL percentages and the discrepancies between initial and postcyclic loading RTL across different abutment groups (p < .05). Additionally, both abutment types and heights were found to significantly influence the RTL percentage (p < .05).
CONCLUSIONS: The type and height of the implant abutment affected screw loosening, and in an increased CHS of 12 mm, using a stock abutment with a postheight of 4 mm can be effective in minimizing screw loosening.
摘要：
目的：基牙螺钉的稳定性对于成功的种植体支撑修复至关重要，然而，螺钉松动仍然是一个常见的并发症，导致功能受损和潜在的植入物失败。本研究旨在评估牙冠高度空间（CHS）增加的情况下，不同种植体基牙类型和高度对螺钉松动的影响。
方法：在这项体外研究中，根据其类型和高度，在八个不同的组中总共评估了64个基台。这些群体包括股票，cast,和高度为4mm的铣削基台（S4、C4和M4组），7mm（S7、C7和M7组），和10毫米（组C10和M10）。在对基台施加动态循环载荷之前和之后，评估了去除扭矩损失（RTL）。此外,分析各组初始RTL和循环负荷后RTL之间的差异(p<.05).
结果：C10组显示最高的RTL，而S4组表现出最低的初始RTL百分比(p<.05)。此外，该研究确定了RTL百分比的显着差异，以及不同基台组的初始和循环后负荷RTL之间的差异（p<.05）。此外,基牙类型和高度均显著影响RTL百分比（p<.05）。
结论：种植体基台的类型和高度影响螺钉松动，在增加12毫米的CHS中，使用具有4mm位置的基台可以有效地减少螺钉松动。
方法：在这项体外研究中，根据其类型和高度，在八个不同的组中总共评估了64个基台。这些群体包括股票，cast,和高度为4mm的铣削基台（S4、C4和M4组），7mm（S7、C7和M7组），和10毫米（组C10和M10）。在对基台施加动态循环载荷之前和之后，评估了去除扭矩损失（RTL）。此外,分析各组初始RTL和循环负荷后RTL之间的差异(p<.05).
结果：C10组显示最高的RTL，而S4组表现出最低的初始RTL百分比(p<.05)。此外，该研究确定了RTL百分比的显着差异，以及不同基台组的初始和循环后负荷RTL之间的差异（p<.05）。此外,基牙类型和高度均显著影响RTL百分比（p<.05）。
结论：种植体基台的类型和高度影响螺钉松动，在增加12毫米的CHS中，使用具有4mm位置的基台可以有效地减少螺钉松动。
