University of Berne, Freiburgstrasse 7, Berne, 3010, Switzerland.
J Dent Res. 2013 Dec;92(12 Suppl):195S-201S. doi: 10.1177/0022034513506713. Epub 2013 Oct 24.
Dimensional alterations of the facial bone wall following tooth extractions in the esthetic zone have a profound effect on treatment outcomes. This prospective study in 39 patients is the first to investigate three-dimensional (3D) alterations of facial bone in the esthetic zone during the initial 8 wks following flapless tooth extraction. A novel 3D analysis was carried out, based on 2 consecutive cone beam computed tomographies (CBCTs). A risk zone for significant bone resorption was identified in central areas, whereas proximal areas yielded only minor changes. Correlation analysis identified a facial bone wall thickness of ≤ 1 mm as a critical factor associated with the extent of bone resorption. Thin-wall phenotypes displayed pronounced vertical bone resorption, with a median bone loss of 7.5 mm, as compared with thick-wall phenotypes, which decreased by only 1.1 mm. For the first time, 3D analysis has allowed for documentation of dimensional alterations of the facial bone wall in the esthetic zone of humans following extraction. It also characterized a risk zone prone to pronounced bone resorption in thin-wall phenotypes. Vertical bone loss was 3.5 times more severe than findings reported in the existing literature.
拔牙后在美学区域对面部骨壁的三维改变对治疗结果有深远的影响。这项在 39 名患者中进行的前瞻性研究首次调查了无瓣拔牙后最初 8 周内美学区面部骨的三维改变。基于两次连续的锥形束计算机断层扫描（CBCT）进行了新的三维分析。确定了中央区域存在明显骨吸收的危险区域，而近端区域仅发生轻微变化。相关性分析确定骨壁厚度≤1 毫米是与骨吸收程度相关的关键因素。薄壁表型显示明显的垂直骨吸收，中位骨丢失为 7.5 毫米，而厚壁表型仅减少 1.1 毫米。首次通过三维分析证明了人类在拔牙后美学区面部骨壁的三维改变。它还确定了薄壁表型中易发生明显骨吸收的危险区域。垂直骨丢失比现有文献报道的结果严重 3.5 倍。
