Department of Periodontics, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
Department of Orthodontics, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
Medicina (Kaunas). 2019 Sep 3;55(9):565. doi: 10.3390/medicina55090565.
This study investigated the morphology of the labial and palatal bony wall of the maxillary central and lateral incisors using cone-beam computed tomography (CBCT). The difference between males and females and the measurement between right and left sides were measured. Twenty participants, consisting of 11 females and 9 males having normal occlusion, were used for the analysis. The mean age was 21.9 ± 3.0 years. The thickness of the labial bony wall and palatal bony wall, perpendicular to the long axis of the root, were evaluated at 3 and 5 mm apical from the cemento-enamel junction (CEJ) and at the root apex. The available bony wall below the apex of the central and lateral incisors, and the angulation between the long axis of the tested tooth and outer surface of the labial bone were measured. The mean labial bony wall thickness at the 3 and 5 mm apical from the CEJ were 1.1 ± 0.3 mm and 1.0 ± 0.4 mm for central incisors, respectively, as well as 1.2 ± 0.4 mm and 1.0 ± 0.4 mm for lateral incisors, respectively. The mean palatal bony wall thickness at 5 mm from the CEJ was above 2 mm in the central and lateral incisors. The percentage of labial bony wall thickness 2 mm or greater at the root apex in central incisors was higher than in lateral incisors (62.5% vs. 55.0%). The percentage of palatal bony wall thickness ≥2 mm at 3 mm apical from the CEJ in the central incisors was higher than in the lateral incisors (37.5% vs. 15.0%). The results on the left and right sides did not show statistically significant differences, except in the labial and palatal bony wall thickness at 3 mm from the CEJ in the lateral incisor. Generally, no significant differences were seen between males and females, but males had a significantly higher labial bony wall thickness at 3 and 5 mm from the CEJ in the central and lateral incisors when compared with females. This study showed that a majority of the cases of Korean participants had less than 2 mm of labial bony wall thickness at 3 and 5 mm apical from the CEJ at central and lateral incisors, and this should be kept in mind while performing dental practices, including tooth extraction or immediate implantation in anterior regions. Preoperative analysis using CBCT may be beneficial for establishing the treatment plan.
本研究使用锥形束 CT（CBCT）研究上颌中切牙和侧切牙的唇侧和腭侧骨壁形态。测量了男性和女性之间的差异以及左右两侧之间的测量值。 分析使用了 20 名具有正常咬合的参与者，包括 11 名女性和 9 名男性。平均年龄为 21.9 ± 3.0 岁。在釉牙骨质界（CEJ）下 3 和 5 毫米处，以及根尖处，评估垂直于根长轴的唇侧骨壁和腭侧骨壁的厚度。测量中切牙和侧切牙根尖下方的可用骨壁以及测试牙长轴与唇骨外表面之间的角度。 中切牙在 CEJ 下 3 和 5 毫米处的平均唇侧骨壁厚度分别为 1.1 ± 0.3 毫米和 1.0 ± 0.4 毫米，侧切牙分别为 1.2 ± 0.4 毫米和 1.0 ± 0.4 毫米。中切牙和侧切牙在 CEJ 下 5 毫米处的平均腭侧骨壁厚度均超过 2 毫米。根尖处唇侧骨壁厚度为 2 毫米或更大的中切牙百分比高于侧切牙（62.5% vs. 55.0%）。中切牙在 CEJ 下 3 毫米处的腭侧骨壁厚度≥2 毫米的百分比高于侧切牙（37.5% vs. 15.0%）。左右两侧的结果没有统计学上的显著差异，但在侧切牙 CEJ 下 3 毫米处的唇侧和腭侧骨壁厚度上存在差异。总体而言，男性和女性之间没有明显差异，但与女性相比，男性中切牙和侧切牙在 CEJ 下 3 和 5 毫米处的唇侧骨壁厚度明显更高。 本研究表明，大多数韩国参与者的中切牙和侧切牙在 CEJ 下 3 和 5 毫米处的唇侧骨壁厚度小于 2 毫米，这在进行包括前牙拔牙或即刻种植在内的牙科治疗时应牢记在心。使用 CBCT 进行术前分析可能有助于制定治疗计划。
