Prasad Mandava, Mohamed Shamil, Nayak Krishna, Shetty Sharath Kumar, Talapaneni Ashok Kumar
Department of Orthodontics and Dentofacial Orthopedics, Narayana Dental College and Hospital, Chinthareddypalem, Nellore - 524 003, India.
Department of Conservative Dentistry and Endodontics, Narayana Dental College and Hospital, Chinthareddypalem, Nellore - 524 003, Andhra Pradesh, India.
J Nat Sci Biol Med. 2014 Jan;5(1):123-9. doi: 10.4103/0976-9668.127305.
The success of bonding brackets to enamel with resin bonding systems is negatively affected by contamination with oral fluids such as blood and saliva. The new self-etch primer systems combine conditioning and priming agents into a single application, making the procedure more cost effective.
The purpose of the study was to investigate the effect of moisture, saliva and blood contamination on shear bond strength of orthodontic brackets bonded with conventional bonding system and self-etch bonding system.
Each system was examined under four enamel surface conditions (dry, water, saliva, and blood), and 80 human teeth were divided into two groups with four subgroups each of 10 according to enamel surface condition. Group 1 used conventional bonding system and Group 2 used self-etched bonding system. Subgroups 1a and 2a under dry enamel surface conditions; Subgroups 1b and 2b under moist enamel surface condition; Subgroups 3a and 3b under saliva enamel surface condition and Subgroup 4a and 4b under blood enamel surface condition. Brackets were bonded, and all the samples were then submitted to a shear bond test with a universal testing machine with a cross head speed of 1mm/sec.
The results showed that the contamination reduced the shear bond strength of all groups. In self-etch bonding system water and saliva had significantly higher bond strength when compared to other groups.
It was concluded that the blood contamination showed lowest bond strength from both bonding systems. Self-etch bonding system resulted in higher bond strength than conventional bonding system under all conditions except the dry enamel surface.
用树脂粘结系统将托槽粘结到牙釉质上的成功率会受到血液和唾液等口腔液体污染的负面影响。新型自酸蚀底漆系统将酸蚀剂和底漆结合为单次应用，使该过程更具成本效益。
本研究的目的是调查湿度、唾液和血液污染对用传统粘结系统和自酸蚀粘结系统粘结的正畸托槽剪切粘结强度的影响。
在四种牙釉质表面条件（干燥、水、唾液和血液）下对每种系统进行检测，80颗人牙根据牙釉质表面条件分为两组，每组四个亚组，每组10颗。第1组使用传统粘结系统，第2组使用自酸蚀粘结系统。亚组1a和2a处于干燥牙釉质表面条件下；亚组1b和2b处于潮湿牙釉质表面条件下；亚组3a和3b处于唾液污染牙釉质表面条件下，亚组4a和4b处于血液污染牙釉质表面条件下。粘结托槽，然后所有样本用万能试验机以1mm/秒的十字头速度进行剪切粘结测试。
结果表明，污染降低了所有组的剪切粘结强度。在自酸蚀粘结系统中，与其他组相比，水和唾液污染时的粘结强度显著更高。
得出的结论是，血液污染在两种粘结系统中显示出最低的粘结强度。除干燥牙釉质表面外，在所有条件下自酸蚀粘结系统的粘结强度均高于传统粘结系统。
