Shukla Chandresh, Maurya Rajkumar, Jain Upendra, Gupta Ankur, Garg Jayshree
Department of Orthodontics and Dentofacial Orthopedics, Peoples College of Dental Sciences and RC, Bhopal, Madhya Pradesh, India.
Corps Dental Unit, Department of Orthodontics and Dentofacial Orthopedics, Bhopal, Madhya Pradesh, India.
J Orthod Sci. 2014 Oct;3(4):132-6. doi: 10.4103/2278-0203.143235.
To compare the mean shear bond strength (SBS) of moisture insensitive primer (MIP) used for orthodontic bonding in the presence and absence of saliva.
A total of 60 human noncarious maxillary premolars with sound buccal surfaces, recently extracted were collected in two groups of each 30. Maxillary premolar brackets were bonded to the teeth using light cure (Transbond XT, 3M Unitek, Monrovia, CA, USA) and MIP (Transbond MIP 3M Unitek, Monrovia, CA, USA,) in the presence and absence of saliva. Operators' saliva was used during the bonding under moist condition. After debonding, all the specimens were examined under a stereomicroscope (×40 magnification) for adhesive remnant using adhesive remnant index (ARI). The SBS tests were done using Instron universal testing machine at cross-head speed of 1 mm/min, force passing parallel to the buccal surface using custom rod and registered in Newtons later converted into Megapascals.
Light cure and MIP (Transbond MIP and Transbond XT, 3M Unitek, Monrovia, CA, USA) in the absence of saliva showed higher mean SBS than the presence of saliva. Group I (light cure and MIP) in the absence of saliva showed mean SBS of 9.65 ± 0.90 Mpa. Group II (light cure and MIP) with the presence of saliva showed mean SBS of 9.03 ± 1.14 Mpa. The difference between both the groups was statistically significant, as confirmed by paired t-test (P < 0.05). In-Group I, ARI scores showed that more than half of the adhesive was left over the tooth surface, and Group II showed that there was no or insignificant amount of adhesive left over the tooth surface. Chi-square test revealed significant difference in debonding characteristics among the test groups of ARI (P < 0.05). Failure occurred mainly in resin- bracket base and resin - adhesive interfaces (χ² = 10.04, df = 3, P = 0.031).
Moisture insensitive primer is effective in the presence/absence of moisture and has shown SBS value of more than 7.8 Mpa as stated by Reynolds, hence material is suitable for clinical use.
比较在有唾液和无唾液情况下用于正畸粘接的湿敏性底漆（MIP）的平均剪切粘结强度（SBS）。
收集60颗近期拔除的、颊面健康的人类非龋上颌前磨牙，分为两组，每组30颗。在上颌前磨牙上使用光固化剂（Transbond XT，3M Unitek，美国加利福尼亚州蒙罗维亚）和MIP（Transbond MIP 3M Unitek，美国加利福尼亚州蒙罗维亚）在有唾液和无唾液的情况下进行托槽粘接。在潮湿条件下粘接时使用操作人员的唾液。脱粘后，所有标本在体视显微镜（×40放大倍数）下使用粘接剂残留指数（ARI）检查粘接剂残留情况。使用Instron万能试验机以1mm/min的十字头速度进行SBS测试，力通过定制杆平行于颊面施加，记录为牛顿，随后转换为兆帕。
在无唾液情况下，光固化剂和MIP（Transbond MIP和Transbond XT，3M Unitek，美国加利福尼亚州蒙罗维亚）显示出比有唾液时更高的平均SBS。第一组（光固化剂和MIP）在无唾液情况下的平均SBS为9.65±0.90MPa。第二组（光固化剂和MIP）在有唾液情况下的平均SBS为9.03±1.1 MPa。两组之间的差异具有统计学意义，配对t检验证实（P<0.05）。在第一组中，ARI评分显示超过一半的粘接剂留在牙齿表面，而第二组显示牙齿表面没有或仅有少量粘接剂残留。卡方检验显示ARI测试组之间的脱粘特性存在显著差异（P<0.05）。失败主要发生在树脂-托槽基底和树脂-粘接剂界面（χ²=10.04，df=3，P=0.031）。
湿敏性底漆在有/无湿气情况下均有效，并且如雷诺兹所述显示出超过7.8MPa的SBS值，因此该材料适用于临床。
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