Vicente Ascensión, Navarro Raúl, Mena Ana, Bravo Luis A
Unit of Orthodontics, Dental Clinic, University of Murcia, Hospital Morales Meseguer, Spain.
Am J Dent. 2006 Oct;19(5):271-4.
To evaluate the effectiveness of the compomer Dyract AP for bonding brackets when conditioning the enamel with phosphoric acid and a non-rinsing conditioner (NRC), in comparison with a control group in which the resin orthodontic adhesive system Transbond XT was used.
The brackets were bonded to extracted premolars which were divided into three groups: (1) Acid/Transbond XT, (2) NRC/Dyract AP and (3) Acid/Dyract AP. Shear bond strength was measured with a universal testing machine. The crosshead speed was 1mm/minute. The adhesive remnant on the tooth after debonding was determined using image analysis equipment.
The bond strength of Acid/Transbond XT was significantly higher than bond strengths of Acid/Dyract AP and NRC/Dyract AP (P< 0.017). No significant differences were observed between Acid/Dyract AP and NRC/Dyract APBond strength values (P> 0.017). Acid/Transbond XT left significantly more adhesive on the tooth than Acid/Dyract AP and NRC/Dyract AP, whereas NRC/Dyract AP left significantly less adhesive than Acid/Dyract AP (P< 0.05).
评估当使用磷酸和非冲洗型调节剂（NRC）对牙釉质进行预处理时，复合树脂类Dyract AP粘结托槽的有效性，并与使用树脂正畸粘结系统Transbond XT的对照组进行比较。
将托槽粘结到拔除的前磨牙上，这些前磨牙被分为三组：（1）酸/Transbond XT组，（2）NRC/Dyract AP组，（3）酸/Dyract AP组。使用万能试验机测量剪切粘结强度。十字头速度为1毫米/分钟。使用图像分析设备确定脱粘后牙齿上的粘结剂残留量。
酸/Transbond XT组的粘结强度显著高于酸/Dyract AP组和NRC/Dyract AP组（P<0.017）。酸/Dyract AP组和NRC/Dyract AP组的粘结强度值之间未观察到显著差异（P>0.017）。酸/Transbond XT组在牙齿上留下的粘结剂明显多于酸/Dyract AP组和NRC/Dyract AP组，而NRC/Dyract AP组留下的粘结剂明显少于酸/Dyract AP组（P<0.05）。
