Tiantian Yu, Bishuang Pu, Jin Liu, Yulan Xia, Gang Wang, Jing Lan
Dept. of Implantology, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China.
Dept. of Prosthodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2017 Dec 1;35(6):603-606. doi: 10.7518/hxkq.2017.06.008.
This study aimed at investigating and measuring the positional relationship between the long axis of the mandibular anterior teeth and the alveolar bone using cone beam computed tomography (CBCT) to provide reference data for implant treatment.
From the CBCT image database, 150 cases of radiographic data were selected according to the inclusion criteria and then were divided into six groups: males' mandibular central incisors, males' mandibular lateral incisors, males' mandibular canines, females' mandibular central incisors, females' mandibular lateral incisors, and females' mandibular canines. The angle (β) formed by the long axis of the mandibular anterior teeth and the corresponding alveolar bone was measured and recorded. Based on the long axis of alveolar bone, if the teeth incline to the lingual side, the value of the angle (β) was positive; otherwise, the value was negative. The resultant data were analyzed by SPSS 19.0.
RESULTS: The β of the mandibular central incisors presented a mean value of 4.77° (range: -8.17°-16.10°) for male subjects and 5.38° (range: -5.63°-12.93°) for female subjects. The β of the mandibular lateral incisors exhibited a mean value of 6.12° (range: -2.87°- 17.57°) for male subjects and 5.81° (range: -7.70°-15.70°) for female subjects. Finally, the β of the mandibular canines presented a mean value of 5.01° (range: -8.13°-17.67°) for male subjects and 6.21° (range: -7.70°-17.87°) for female subjects. The percentages of the β between -10° and 10° of males' mandibular incisors, mandibular lateral incisors, and mandibular canines were 87.34%, 80.67%, and 88.00%, respectively and those of females were 90.67%, 82.66%, and 82.66%, respectively. Whether male or female, the percentages of the β between -10° and 10° of the mandibular anterior teeth were more than 80%. The β that inclined to the lingual was not more than 20° and to the labial did not exceed 10°.
The long axis of the mandibular anterior teeth was almost consistent with the long axis of the alveolar bone. Therefore, the positional relationship could be referred to make reasonable implants treatment plan.
本研究旨在使用锥形束计算机断层扫描（CBCT）研究并测量下颌前牙长轴与牙槽骨之间的位置关系，为种植治疗提供参考数据。
从CBCT图像数据库中，根据纳入标准选取150例影像学数据，然后分为六组：男性下颌中切牙、男性下颌侧切牙、男性下颌尖牙、女性下颌中切牙、女性下颌侧切牙和女性下颌尖牙。测量并记录下颌前牙长轴与相应牙槽骨形成的角度（β）。以牙槽骨长轴为基准，若牙齿向舌侧倾斜，则角度（β）值为正；否则，值为负。所得数据采用SPSS 19.0进行分析。
男性下颌中切牙的β平均值为4.77°（范围：-8.17°至16.10°），女性为5.38°（范围：-5.63°至12.93°）。男性下颌侧切牙的β平均值为6.12°（范围：-2.87°至17.57°），女性为5.81°（范围：-7.70°至15.70°）。最后，男性下颌尖牙的β平均值为5.01°（范围：-8.13°至17.67°），女性为6.21°（范围：-7.70°至17.87°）。男性下颌中切牙、下颌侧切牙和下颌尖牙β在-10°至10°之间的百分比分别为87.34%、80.67%和88.00%，女性分别为90.67%、82.66%和82.66%。无论男性还是女性，下颌前牙β在-10°至10°之间的百分比均超过80%。向舌侧倾斜的β不超过20°，向唇侧倾斜的不超过10°。
下颌前牙长轴与牙槽骨长轴基本一致。因此，可参考该位置关系制定合理的种植治疗方案。
