【摘要】 目的:应用螺旋CT结合Simplant专业软件对颌骨种植区骨密度进行定量测量,结合Lekholm和Zarb分类法对种植区骨进行分类。方法:对53例拟种植患者进行上下颌骨螺旋CT扫描,扫描图像应用Simplant专业软件进行重建,对136个种植位点的骨密度进行测量,骨密度以Hounsfield units(HU)表示。采用SPSS11.0软件包对数据进行统计学分析,以Mann-Whitney U检验比较不同区域骨密度的差异,并结合Lekholm和Zarb分类法进行分类。结果:所有种植位点的平均骨密度为(714.66±273.72)HU,下颌前牙区的平均骨密度值最大,为(962.96±92.21)HU,其次为上颌前牙区(786.15±188.74)HU、下颌后牙区(785.79±290.91)HU,上颌后牙区骨密度值最小,为(569.67±244.34)HU。所有种植位点中,Ⅳ类骨占26.5%,下前牙区Ⅳ类骨最少,上颌后牙区Ⅳ类骨最多(P<0.01)。结论:下颌前牙区平均骨密度值最大,上颌后牙区平均骨密度值最小。大多数种植位点骨密度分类为I类骨和Ⅱ/Ⅲ类骨,Ⅳ类骨所占比例较小。螺旋CT可以提供种植区骨密度的信息,对种植的术前设计和术后评估有重要意义。更多还原

【Abstract】 PURPOSE:To assess the bone density of dental implant sites using spiral CT and simplant software,and classify them by Lekholm and Zarb grouping.METHODS: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.RESULTS: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.CONCLUSIONS:Anterior mandible has the highest mean bone density and posterior maxilla has the lowest mean bone density.There are class I andⅡ/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.更多还原