Zakirulla M, Uloopi K S, Subba Reddy V V
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Karnataka, India.
J Dent Child (Chic). 2011 Jan-Apr;78(1):31-5.
The purpose of this in vivo study was to evaluate and compare the reduction in bacterial count in dentin after caries excavation with a spoon excavator, carbide bur, and polymer bur.
Forty-five primary molar teeth from 36 children with occlusal dentinal carious lesions without pulpal involvement were chosen and divided into 3 groups: (1) caries was excavated using a brand new round bur with a slow-speed handpiece at 800 rpm from the occlusal aspect; (2) new polymer burs were used with slow-speed handpiece at 800 rpm, according to the lesion's size; (3) caries was excavated using a sterile spoon excavator.
The mean difference in colony forming units of Streptococcus mutans and lactobacilli before and after caries excavation was found to be significant (P<.01) in all 3 groups. Further intergroup comparison of percentage reduction in bacterial counts between different groups was statistically significant, except when the percentage reduction in S mutans of group 2 was compared to that of group 3 (P=.26). Reduction in S mutans count was highly significant (P<.001) for group 1 vs group 3.
Caries removal with a carbide bur, polymer bur, and spoon excavator produced significant reduction in viable count of both Streptococcus mutans and lactobacilli. Carbide burs, however, produced greater reduction in the viable count of bacteria followed by polymer bur and spoon excavator.
本体内研究的目的是评估和比较用匙形挖器、硬质合金车针和聚合物车针对龋洞进行去龋后牙本质中细菌数量的减少情况。
选取36名患有咬合面牙本质龋损且未累及牙髓的儿童的45颗乳磨牙，分为3组：（1）使用全新的圆头车针，以800转/分钟的低速手机从咬合面去除龋坏组织；（2）根据龋损大小，使用全新的聚合物车针，以800转/分钟的低速手机操作；（3）用无菌匙形挖器去除龋坏组织。
在所有3组中，变形链球菌和乳酸杆菌在去龋前后的菌落形成单位平均差异均具有统计学意义（P<0.01）。除了比较第2组和第3组变形链球菌数量减少百分比时（P = 0.26），不同组之间细菌数量减少百分比的进一步组间比较具有统计学意义。第1组与第3组相比，变形链球菌数量减少非常显著（P<0.001）。
用硬质合金车针、聚合物车针和匙形挖器去除龋坏组织均能使变形链球菌和乳酸杆菌的活菌数量显著减少。然而，硬质合金车针使细菌活菌数量减少得更多，其次是聚合物车针和匙形挖器。
