Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland.
Clin Oral Implants Res. 2011 Mar;22(3):295-301. doi: 10.1111/j.1600-0501.2010.02010.x. Epub 2010 Oct 6.
To analyze the dimensions and anatomic characteristics of the nasopalatine canal and the corresponding buccal bone plate of the alveolar process, using limited cone-beam computed tomography (CBCT) imaging.
Partially edentulous patients scheduled for CBCT imaging for further radiographic evaluation of a prospective implant recipient site in the anterior maxilla were consecutively enrolled in this study. For all CBCT images, a limited field of view (FOV) of 4 × 4 cm, 6 × 6 cm or 8 × 8 cm was selected. Reformatted sagittal and coronal slices were analyzed with regard to dimensions and anatomic characteristics of the nasopalatine canal as well as the dimensions of the buccal bone wall. Factors influencing these parameters were evaluated using univariate and multivariate linear regression models.
The study population comprised 44 men and 56 women with a mean age of 43.09 years. Gender of the included patients had a statistically significant influence on the dimensions of the buccal bone plate, the mean values being generally higher for male subjects. In the multivariate linear regression model, the status of the central maxillary incisors (both present, one missing, and both missing) and the time elapsed since loss of the central incisors (<1 year vs. >1 year) were independently associated with buccal bone wall measurements, adjusted for age and sex.
The present study demonstrates decreasing values for the coronal width of the buccal bone wall in patients with missing central incisors and a time span since tooth loss of over 1 year. The age of the patients had a significant influence only on the length of the nasopalatine canal, with the mean values generally decreasing with an increasing age. The limited CBCT scans with FOVs varying between 4 × 4 and 8 × 8 cm are a valid diagnostic alternative to cross-sectional imaging in the anterior maxilla for dental implant treatment planning.
使用有限锥形束计算机断层扫描（CBCT）成像分析鼻腭管的维度和解剖特征以及牙槽突的颊侧骨板。
本研究连续纳入了因前上颌种植体受植区进一步影像学评估而接受 CBCT 成像的部分缺牙患者。对所有 CBCT 图像，选择 4×4cm、6×6cm 或 8×8cm 的有限视野（FOV）。对矢状和冠状位的重建切片进行分析，以评估鼻腭管的维度和解剖特征以及颊侧骨壁的维度。使用单变量和多变量线性回归模型评估影响这些参数的因素。
研究人群包括 44 名男性和 56 名女性，平均年龄为 43.09 岁。患者的性别对颊侧骨板的维度有统计学显著影响，男性的平均值通常较高。在多变量线性回归模型中，上颌中切牙的状态（均存在、缺失一个、均缺失）和上颌中切牙缺失后的时间（<1 年 vs. >1 年）是颊侧骨壁测量的独立相关因素，校正了年龄和性别。
本研究表明，缺失中切牙的患者的颊侧骨板冠状宽度值降低，且牙缺失时间超过 1 年。患者的年龄仅对鼻腭管的长度有显著影响，平均值随着年龄的增加而普遍降低。FOV 在 4×4cm 至 8×8cm 之间的有限 CBCT 扫描是前上颌牙种植体治疗计划的横断面成像的有效替代诊断方法。
