Li Feng-bo, Yu Li-ying, Cai Yi-da, Xie Chun
Department of Stomatology, Fudan University, Shanghai 200040, China.
Shanghai Kou Qiang Yi Xue. 2009 Feb;18(1):52-5.
To assess the bone density of dental implant sites using spiral CT and simplant software, and classify them by Lekholm and Zarb grouping.
53 patients' jaw bone were scanned by spiral CT, the scanned images were reconstructed by the Simplant software.The bone density of 136 designed implant sites was measured and the results were recorded using Hounsfield units(HU).The data was analyzed with SPSS11.0 software package for Mann-Whitney U test, and classified by Lekholm and Zarb grouping.
The mean bone density in all implant sites was (714.66+/-273.72) HU.The anterior mandible mean bone density was (962.96+/-92.21)HU>anterior maxilla, (786.15+/-188.74) HU>posterior mandible, (785.79+/-290.91) HU>posterior maxilla, (569.67+/-244.34)HU. Bone class IV was least in anterior mandible and most in posterior maxilla(P<0.01), accounting for 26.5% in all implant sites.
Anterior mandible has the highest mean bone density and posterior maxilla has the lowest mean bone density. There are class I and II/III in most of the implant sites. Spiral CT is a useful tool for determining the bone density, which is important for preoperative design and postoperative assessment.
使用螺旋CT和Simplant软件评估牙种植部位的骨密度，并根据Lekholm和Zarb分类法对其进行分类。
对53例患者的颌骨进行螺旋CT扫描，扫描图像用Simplant软件重建。测量136个设计种植部位的骨密度，结果用亨氏单位（HU）记录。数据用SPSS11.0软件包进行曼-惠特尼U检验分析，并根据Lekholm和Zarb分类法进行分类。
所有种植部位的平均骨密度为（714.66±273.72）HU。下颌前部平均骨密度为（962.96±92.21）HU＞上颌前部（786.15±188.74）HU＞下颌后部（785.79±290.91）HU＞上颌后部（569.67±244.34）HU。骨IV类在下颌前部最少，在上颌后部最多（P＜0.01），占所有种植部位的26.5%。
下颌前部平均骨密度最高，上颌后部平均骨密度最低。大多数种植部位为I类和II/III类。螺旋CT是确定骨密度的有用工具，对术前设计和术后评估很重要。
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