結論 - 人工牙根與支台體接合形態及骨脊下植入位置對下顎周圍骨質之應力分布影響; Influence of Implant-Abutment Connection Design and Su

本研究以兩大部分，分別探討人工牙根與支台體之 I.接合寬度、

接合深度、接合角度，與 II.接合位置與骨脊之相對位置，其結論如下:

1. 植體與支台體接合因素中，接合寬度對周圍骨應力之影響性高於接合深度，而接合角度的影響性最小。

2. 減少接合寬度明顯降低骨質應力值，其原因在於接合寬度減少可增加植體壁厚度，較大之植體璧的厚度，提供較大的應力分散空間，有效降低植體應力質，其降低植體應力值的效果，連帶降低了周圍骨質的應力值，此為平台移轉接合造成骨應力值較低的主因；然而，縮減接合寬度將直接造成支台體本身之應力值增加，

可能會提高支台體疲勞斷裂的危險性。

3. 錐狀支台體與植體間之接合深度增加，亦有助降低骨質應力值，

其原因在於增加了支台體與植體間之接合面積，並有助於將應力向植體壁深處分散。

4. 植體與支台體間錐狀接合角度對周圍骨應力影響不大，僅在植體受垂直力時，較小的接合角度可些微降低骨質應力值。

為最直接的骨應力承擔部位，其降低骨質應力值的效果顯著。骨質應力值降低之效果為非線性，並以接觸皮質骨為2.5 mm 為一分水嶺，低於 2.5 mm，增加接觸皮質骨厚度，可快速降低骨質應力值，高於 2.5 mm，增加接觸皮質骨厚度，骨質應力值並無顯著降低。

6. 在骨脊下植入植體時，骨質與人工牙根未接觸的厚度(未接觸皮質骨)，提供較大的應力分散空間，亦具有降低骨質應力值的效果，

但其降低的效果有限。適當厚度之未接觸皮質骨（≧0.6 mm）可降低骨應力值；厚度不足（＜0.6 mm）會阻礙應力分散，造成應力提高。

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在文檔中人工牙根與支台體接合形態及骨脊下植入位置對下顎周圍骨質之應力分布影響; Influence of Implant-Abutment Connection Design and Subcrestal Depth of Insertion on Stress Distribution in Mandibular Peri-Implant Crestal Bone (頁 130-135)