Periodontics, Melbourne Dental School, The University of Melbourne, Victoria, Australia.
Clin Oral Investig. 2023 Jun;27(6):3261-3274. doi: 10.1007/s00784-023-04942-2. Epub 2023 Mar 22.
This study assessed bone height between novel tapered implants at different inter-implant thread peak (TP) distances, and the impact of TP distance from outer buccal bone (BB) on marginal bone levels (MBL).
Fully tapered implants with 0.5-mm thread depth and TP diameter 1 mm wider than the shoulder diameter were placed in healed ridges of minipigs. On one side, four implants were placed with inter-implant TP distances of 1, 2, or 3 mm corresponding to inter-implant implant shoulder distances of 2, 3, and 4 mm respectively. Three implants were placed on the other side with TP distances to outer BB of > 1 mm, 0.5-1 mm, or < 0.5 mm. After 12 weeks, (a) first bone-to-implant contact (fBIC), total BIC, bone area-to-total area (BATA), and coronal bone height between implants (Bi ½ max) for inter-implant distance, and (b) fBIC, BIC, and perpendicular crest to implant shoulder (pCIS) for BB were evaluated.
No significant differences in bone healing and inter-implant bone height were noted for any of the TP distances. BB resorption was significant when TP distance to outer BB was < 0.5 mm. However, fBIC was lowest with TP to outer BB of 1.75 mm.
Inter-implant bone height between adjacent implants can be maintained even at an inter-implant TP distance as low as 1 mm. A minimum TP to outer BB distance of 0.75 mm is required for predictable maintenance of MBL.
Inter-implant distance and BB thickness are clinically relevant and require preclinical research to clarify concepts.
本研究评估了不同种植体间螺纹峰（TP）距离的新型锥形种植体之间的骨高度，并评估了 TP 距颊侧骨外表面（BB）的距离对边缘骨水平（MBL）的影响。
将具有 0.5mm 螺纹深度和 TP 直径比肩宽宽 1mm 的全锥形种植体植入小型猪愈合的牙槽嵴中。一侧放置四个种植体，种植体间 TP 距离分别为 1、2 或 3mm，相应的种植体间肩宽距离分别为 2、3 和 4mm。另一侧放置三个种植体，TP 距离至 BB 外表面分别为>1mm、0.5-1mm 或<0.5mm。12 周后，（a）评估种植体间距离的种植体-骨接触率（fBIC）、总骨接触率（BIC）、骨面积与总面积比（BATA）和种植体间中间骨高度（Bi ½ max），以及（b）评估 BB 的 fBIC、BIC 和颊侧种植体肩顶至嵴顶距离（pCIS）。
任何 TP 距离均未观察到骨愈合和种植体间骨高度的显著差异。当 TP 距离至 BB 外表面<0.5mm 时，BB 吸收显著。然而，当 TP 距离至 BB 外表面为 1.75mm 时，fBIC 最低。
即使种植体间 TP 距离低至 1mm，相邻种植体之间的种植体间骨高度也可以维持。为了可预测地维持 MBL，需要将 TP 距 BB 外表面的最小距离保持在 0.75mm 以上。
种植体间距离和 BB 厚度具有临床相关性，需要进行临床前研究以阐明概念。
