Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland.
Private Practice, Solothurn, Switzerland.
Clin Oral Investig. 2020 Oct;24(10):3609-3617. doi: 10.1007/s00784-020-03235-2. Epub 2020 Feb 7.
To evaluate the crestal bone response to a two-piece zirconia implant compared with a control titanium implant using periapical radiographs (PAs) and histometry.
Thirty zirconia and 30 titanium implants were placed in healed posterior mandibles of five canines. Full-ceramic single-tooth restorations were cemented after 6 weeks of healing. Three observers measured the distance between the implant shoulder and the crestal bone (DIB) at placement, loading, and harvesting after 4 or 16 weeks in function. The influence of implant material and loading time on DIB as well as the inter-observer agreement were analyzed. Additionally, histometric distance between implant shoulder and most coronal bone-to-implant contact (IS-cBIC) was compared with DIB.
Mean DIB values increased between 4 and 16 weeks of loading for both zirconia (from 1.66 to 2.25 mm; P < 0.0001) and titanium (from 1.81 to 1.95 mm; P = 0.06). Zirconia yielded mean IS-cBIC values of 2.18 mm and 2.48 mm (P < 0.001) and titanium 2.23 mm and 2.34 mm (P = 0.27) after 4 and 16 weeks, respectively. The raters reached an excellent intraclass correlation coefficient. PAs underestimated the bone loss on average by 0.39 mm.
Zirconia implants showed a greater increase of DIB during early healing and function than titanium.
Crestal peri-implant tissue dimensions may show more pronounced changes around two-piece zirconia implants during early healing. PAs may underestimate peri-implant bone loss.
通过根尖片（PA）和组织计量学评估两段式氧化锆种植体与对照钛种植体的骨反应。
将 30 个氧化锆和 30 个钛种植体植入 5 只犬的愈合后下颌骨后。愈合 6 周后，全陶瓷单牙修复体被粘结。在功能 4 或 16 周后，3 名观察者测量种植体肩与牙槽嵴骨之间的距离（DIB）在植入、加载和收获时的距离。分析了种植体材料和加载时间对 DIB 的影响以及观察者间的一致性。此外，还比较了种植体肩与最冠方骨-种植体接触（IS-cBIC）的组织计量距离与 DIB。
在加载的 4 至 16 周内，氧化锆（从 1.66 至 2.25mm；P<0.0001）和钛（从 1.81 至 1.95mm；P=0.06）的平均 DIB 值均增加。氧化锆在 4 周和 16 周时分别产生了 2.18mm 和 2.48mm 的平均 IS-cBIC 值（P<0.001），钛则分别为 2.23mm 和 2.34mm（P=0.27）。评分者获得了极好的组内相关系数。PA 平均低估了 0.39mm 的骨丢失。
在早期愈合和功能过程中，氧化锆种植体的 DIB 增加大于钛种植体。
在早期愈合过程中，两段式氧化锆种植体周围的种植体周围组织尺寸可能会发生更明显的变化。PA 可能低估了种植体周围的骨丢失。
