전산화단층영상에서 절치관 및 순측 치조골 폭경에 관한 연구

Abstract

The maxillary anterior region is particularly important in achieving an esthetic, phonetic, as well as functional outcome. The use of a surgical template to accurately position the fixture is mandatory. the angulation of the implant body in the prepared osteotomy site in relation to the incisive canal should be observed. This study was performed to assess the width of the labial alveolar bone of the incisive canal and the width of the incisive canal on spiral computed tomographic images of the anterior portion of the maxilla. Study materials included 38 CT scans taken for preoperative planning of implant placement. All scanning was performed using a standard exposure and patient positioning protocol. Axial cross-sectioned image entirely shown the incisive canal was selected and scanned with 600 DPI resolution. The width of the labial alveolar bone of the incisive canal at an orifice to the oral cavity, middle portion, and an orifice to the nasal cavity and the diameter of the incisive canal at the middle portion were determined by two specialist using Digora for Windows 2.1. The statistical analyses were carried out using SPSS 12.0.1. When the maxillary central incisors were remained (20 cases) the mean labial alveolar bone width at an orifice to the oral cavity, middle portion, and an orifice to the nasal cavity were 6.81 ± 1.41㎜, 6.46 ± 1.33㎜, and 7.91 ± 1.33㎜. When the maxillary central incisors were missed (18 cases) the mean width were 5.42 ± 2.20㎜, 6.23 ± 2.29㎜, and 7.89 ± 2.13㎜. The results were as follows: 1. The labial alveolar bone width at middle portion and an orifice to the nasal cavity were no statistically significant difference according to presence of the maxillary central incisors (P>0.05). 2. Irrespective of presence of the maxillary central incisors the difference between the labial alveolar bone at an orifice to the oral cavity and middle portion was a few. But the difference between to oral cavity and to nasal cavity, middle portion and to nasal cavity revealed statistically significant difference (P<0.05). 3. In stepwise regression analysis, it was statistically significant the width of the incisive canal was increased as increasing the width of the labial alveolar bone of the incisive canal (β=0.327, P<0.05). For accurate measurements for dental implant placement in proximity to the incisive canal additional study using computed tomographic images are required.