不同印模法对KennedyⅡ类牙列缺损修复时牙槽骨吸收的影响

Evaluation of the absorption of alveolar bone in different impression methods for repairment of Kennedy Class Ⅱ denture defect

目的运用锥形束CT(cone beam CT,CBCT)评价解剖性印模法和功能性印模法修复下颌KennedyⅡ类牙列缺损患者牙槽骨吸收情况。方法选择下颌KennedyⅡ类牙列缺损患者16例,随机分为功能组和解剖组,每组8例。功能组采用功能性印模,解剖组采用解剖性印模。戴义齿前、正常使用义齿6个月后用CBCT分别测量末端基牙近中、远中牙槽骨及远中游离端剩余牙槽骨骨高度,并计算戴牙前、后的高度差值。结果正常使用义齿6个月后,解剖组末端基牙近中(t=0.742,P<0.05)、远中牙槽骨高度差值(t=5.727,P<0.05)明显高于功能组;功能组和解剖组的游离端剩余牙槽骨高度差值差异无统计学意义(P>0.05)。结论应用功能性印模制作的可摘局部义齿有减少末端基牙近远中牙槽骨骨吸收的趋势,短期内对游离端剩余牙槽骨骨吸收影响不明显。

Objective To evaluate the absorption of alveolar bone in anatomic impression and functional impressiontechnique in the repairment of Kennedy class Ⅱ denture defect by cone beam CT(CBCT). Methods 16 patients withmandibular Kennedy ClassⅡ denture defect were randomly divided into the function group and the anatomical group(n = 8). The function group adopted the functional impression, the anatomical group used anatomic denture impressionfor denture making. Before denture wearing and after 6 months of normal use of denture, CBCT were used to measure theheight of residual alveolar bone in the mesial and distal alveolar bone, and the height difference between the anterior andposterior teeth. Results After 6 months of denture wearing, the height difference of the mesial (n = 0.742, P < 0.05)and distal (t = 5.727, P < 0.05) of the terminal abutment alveolar bone in anatomical group is significantly higher thanthat of the function group (P < 0.05); the height of residual alveolar bone of anatomical group and functional group has nosignificant difference (P > 0.05). Conclusion The denture made by function impression can reduce the absorption of al?veolar bone in the mesial and distal of terminal abutment teeth, while different impression methods don’t have obviousinfluence on the absorption of residual alveolar bone during the short observation research term.