Yoshida T
Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 2000 Sep;67(3):240-50. doi: 10.5357/koubyou.67.240.
The purpose of this study was to investigate the relation between the artificial crown contour and plaque accumulation in severely disabled patients who have muscle hypoactivity in the oral region. This relation was statistically analyzed by the change in CFU numbers of Mutans Streptococci, Lactobacillus, and total anaerobic bacteria. The results were as follows: 1. In the severely disabled group, there was no significant difference in the decrease of number of microorganisms between with and without tooth brushing. When the normal contour crown was exchanged for the under contour, however, the numbers of Mutans Streptococci and total anaerobic bacteria decreased significantly (p < 0.05). 2. In the normal control group, both the crown contour and tooth brushing were effective for decreasing the number of Mutans Streptococci and total anaerobic bacteria (p < 0.05). 3. In both groups, the number of Lactobacillus was decreased by changing the crown contours and by tooth brushing, with no statistical significance. 4. In view of the cariogenic potential of microorganisms, it is concluded that the under contour crown prevents plaque accumulation, and that this crown should be used on severely disabled patients, as it makes tooth brushing more effective.
本研究的目的是调查口腔区域肌肉活动减退的严重残疾患者中人工牙冠外形与菌斑积聚之间的关系。通过变形链球菌、乳酸杆菌和总厌氧菌的菌落形成单位（CFU）数量变化对这种关系进行统计学分析。结果如下：1. 在严重残疾组中，刷牙与否在微生物数量减少方面无显著差异。然而，当将正常外形牙冠更换为外形不足牙冠时，变形链球菌和总厌氧菌数量显著减少（p<0.05）。2. 在正常对照组中，牙冠外形和刷牙对减少变形链球菌和总厌氧菌数量均有效（p<0.05）。3. 在两组中，通过改变牙冠外形和刷牙，乳酸杆菌数量均减少，但无统计学意义。4. 鉴于微生物的致龋潜力，得出结论：外形不足牙冠可防止菌斑积聚，并且这种牙冠应应用于严重残疾患者，因为它能使刷牙更有效。
