Sharma Rekha, Kumar Davender, Verma Meet
Department of Orthodontics and Dentofacial Orthopedics, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India.
Department of Orthodontics, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India.
Contemp Clin Dent. 2017 Jan-Mar;8(1):20-25. doi: 10.4103/ccd.ccd_934_16.
Improving bonding strength to fluorosed teeh.
To determine the effect of deproteinization using 5.25% sodium hypochlorite (NaOCl) prior to acid etching on shear bond strength of orthodontic brackets bonded to fluorosed teeth.
experimental study.
Forty freshly extracted human mandibular first premolars with TFI 4 were selected and divided into two groups of 20 each. In Group I the teeth were acid etched with 37% phosphoric acid and bonded with composite. In Group II the teeth were deproteinized with 5.25% NaOCl prior to acid etching with 37% phosphoric acid and were bonded with composite. Samples were then subjected to shear bond test by Instron Universal Testing machine. The sample from each group were selected for the SEM study (prior to bonding) to analyze the etching patterns achieved.
Data was checked for normality by Shapiro Wilk Test, to compare the two groups unpaired t test was used. value was predetermined at ≤ 0.05.
The S BS of Group II (11.75 ± 2.83 MPa) was higher than Group I (7.44 ± 2.43 MPa) and the difference was statistically significant ( = 0.000). On SEM the etching pattern was more of type 1 and 2 in Group II.
Deproteinization using 5.25% NaOCl prior to acid etching significantly increases the shear bond strength of brackets bonded to fluorosed teeth and can be used as a convenient and effective option in orthodontic bonding to fluorosed teeth.
提高与氟斑牙的粘结强度。
确定在酸蚀前使用5.25%次氯酸钠（NaOCl）进行脱蛋白处理对粘结于氟斑牙的正畸托槽剪切粘结强度的影响。
实验研究。
选取40颗新鲜拔除的TFI 4级人类下颌第一前磨牙，分为两组，每组20颗。第一组牙齿用37%磷酸酸蚀后用复合材料粘结。第二组牙齿在先用37%磷酸酸蚀前用5.25% NaOCl进行脱蛋白处理，然后用复合材料粘结。然后用英斯特朗万能试验机对样本进行剪切粘结测试。从每组中选取样本进行扫描电子显微镜（SEM）研究（粘结前），以分析获得的酸蚀模式。
通过夏皮罗-威尔克检验检查数据的正态性，使用不成对t检验比较两组。P值预先设定为≤0.05。
第二组的剪切粘结强度（S BS）（11.75±2.83MPa）高于第一组（7.44±2.43MPa），差异具有统计学意义（P = 0.000）。在扫描电子显微镜下，第二组的酸蚀模式更多为1型和2型。
在酸蚀前使用5.25% NaOCl进行脱蛋白处理可显著提高粘结于氟斑牙的托槽的剪切粘结强度，可作为正畸粘结氟斑牙的一种方便有效的方法。
