Faculty of Dentistry, Universiti Teknologi MARA (UiTM), Kampus Sungai Buloh, Jalan Hospital, Sungai Buloh, Selangor, Malaysia.
Nur Hafizah Kamar Affendi, Unit of Prosthodontics, Centre of Restorative Dentistry Studies, Faculty of Dentistry, Universiti Teknologi MARA (UiTM), Kampus Sungai Buloh, Jalan Hospital, Sungai Buloh, Selangor, Malaysia, Phone: +60361266545, e-mail:
J Contemp Dent Pract. 2021 Nov 1;22(11):1237-1242.
The aim of this paper is to ascertain the quantitative measurements of alveolar bone thickness at all maxillary anterior teeth and qualitatively demonstrate the relationship between tooth angulation (TA) and alveolar bone thickness.
Cone-beam computed tomography (CBCT) images of 189 maxillary anterior teeth were collected. Sagittal view was selected to perform the measurement on alveolar bone wall at crestal, midlevel, and palatal. TA was measured along to the tooth long axis (TLA) related to the alveolar bone housing. Spearman's correlation coefficients were conducted to test the correlation between the variables.
The facial alveolar bone (FAB) is predominantly thin (<1 mm) at the crestal and midroot region. A significant difference was recorded in the median thickness of FAB at the midroot and apical area ( = 0.001, = 0.021). The FAB thickness was not gradual with midroot being thinner than crestal. For the palatal alveolar bone (PAB), the thickness was increased continuously toward the apex. At all apical levels of inspected teeth, a significant negative correlation existed between TA and FAB. A positive correlation of TA was only significant at the facial crest of lateral incisor ( = 0.308). However, the canines did not correlate with the FAB, but correlated with the PAB at the apical level ( = 0.478).
The FAB wall crest of maxillary anterior teeth was generally thin and not gradual with the lateral incisor being the thinnest. A significant correlation of TA existed based on different types of maxillary anterior teeth and alveolar bone level. The maxillary anterior teeth with increased buccolingual angulation were correlated with thicker bone at the apical level.
The quantitative assessment of FAB and TA in degree may serve as an anatomical index for ideal implant position.
本文旨在确定所有上颌前牙牙槽骨厚度的定量测量值，并定性地展示牙齿倾斜角度（TA）与牙槽骨厚度之间的关系。
收集了 189 颗上颌前牙的锥形束 CT（CBCT）图像。选择矢状视图在牙槽嵴、中根和腭侧进行牙槽骨壁测量。TA 沿与牙槽骨容纳有关的牙齿长轴（TLA）进行测量。采用 Spearman 相关系数检验变量之间的相关性。
颊侧牙槽骨（FAB）在牙槽嵴和根中部主要较薄（<1mm）。中根和根尖区 FAB 的中位数厚度有显著差异（ = 0.001， = 0.021）。FAB 厚度从中根到牙槽嵴没有逐渐变厚。对于腭侧牙槽骨（PAB），厚度向根尖方向逐渐增加。在检查牙齿的所有根尖水平，TA 与 FAB 之间存在显著负相关。TA 的正相关仅在侧切牙颊嵴处具有统计学意义（ = 0.308）。然而，尖牙与 FAB 不相关，但与根尖水平的 PAB 相关（ = 0.478）。
上颌前牙的 FAB 牙槽嵴壁一般较薄，且从中切牙开始逐渐变薄。根据不同类型的上颌前牙和牙槽骨水平，TA 存在显著相关性。颊舌向倾斜角度增加的上颌前牙与根尖水平较厚的骨相关。
FAB 和 TA 的定量评估可作为理想种植体位置的解剖学指标。
