Zhang Chunan, Zhao Xu, Qiao Shichong, Zhang Xiaomeng, Lai Hongchang, Gu Yingxin
Department of Implant Dentistry, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, China.
Peking University Hospital of Stomatology first division, Beijing, China.
Ann Transl Med. 2021 Feb;9(4):335. doi: 10.21037/atm-20-8074.
To compare tissue alteration in fresh extraction sockets between bone-level and tissue-level implants with different neck designs.
Bilateral premolars of 6 adult Labrador dogs were extracted, and 24 bone-level and tissue-level implants with two different neck designs were immediately placed. At the same time, buccal bony wall thickness in fresh extraction sockets was also recorded. The Straumann® Bone Level (BL) and Standard Plus (SP) implants were positioned at two insertion depths: 1mm below and flush with the alveolar crest. All animals were sacrificed 6 months after the implant placement. Undecalcified block sections were obtained for histological measurement. Vertical bone resorption and biological widths were documented. Statistical analysis consisted of two sample t-test and Wilcoxon sign-rank test.
All implants were histologically osseointegrated. There was no significant difference between BL implants and SP implants in vertical bone resorption regardless of the insertion depths (P>0.05). Meanwhile, significant difference was found in lingual biological width between BL (3.16 mm) and SP (2.43 mm) implants when placed 1mm below the alveolar crest (P<0.05).
Within the limits, it seemed that different implant neck designs had little effect on bone remodeling in fresh extraction sockets. However, longer biological width was found in bone-level implants.
比较不同颈部设计的骨水平和软组织水平种植体在新鲜拔牙窝内的组织改变。
拔除6只成年拉布拉多犬的双侧前磨牙，并立即植入24枚具有两种不同颈部设计的骨水平和软组织水平种植体。同时，记录新鲜拔牙窝颊侧骨壁厚度。将士卓曼®骨水平（BL）种植体和标准加强型（SP）种植体置于两个植入深度：牙槽嵴顶下方1mm和与牙槽嵴顶平齐。所有动物在种植体植入后6个月处死。获取未脱钙的块状切片进行组织学测量。记录垂直骨吸收和生物学宽度。统计分析包括两样本t检验和Wilcoxon符号秩检验。
所有种植体在组织学上均实现骨结合。无论植入深度如何，BL种植体和SP种植体在垂直骨吸收方面均无显著差异（P>0.05）。同时，当置于牙槽嵴顶下方1mm时，BL种植体（3.16mm）和SP种植体（2.43mm）在舌侧生物学宽度上存在显著差异（P<0.05）。
在本研究范围内，不同种植体颈部设计似乎对新鲜拔牙窝内的骨重塑影响不大。然而，骨水平种植体的生物学宽度更长。
