Zhao Shi-Min, Huang Xiao, Chen Hui, Wang Jun
Department of Pediatric Dentistry, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology. Shanghai 200011, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2017 Aug;26(4):404-408.
To study the effect of flowable nano-composite and different resin adhesives on reattachment of fractured crowns.
Thirty four fractured human maxillary incisors were obtained and randomly assigned into 4 groups and reattached using two types of adhesives: Easy one (EO) and Single bond 2(SB2), with or without Filtek Z350 flowable nano-composite. Four days after reattaching, the teeth were tested to achieve the shear bonding strength (SBS) and the recovery rate of fracture resistance after reattachment (R) were calculated. Statistical analysis was performed by use of SPSS 20.0 software package.
Using flowable nano-composite failed to increase the SBS and R.The recovery rates of the specimens using EO without flowable composite achieved the highest value and they were significantly higher than those of the specimens using SB2 without flowable composite (P=0.046).
If the fragment matches the fractured tooth perfectly, the tooth reattached using EO without composite will achieve higher bonding strength. However, not all the adhesives can be used to reattach without composite. Clinical decisions should be made on two aspects: whether the selected adhesive has sufficient mechanical strength and if there is any loss of tooth tissue after fracture.
研究可流动纳米复合材料和不同树脂黏结剂对折断牙冠再接的影响。
获取34颗折断的人上颌中切牙，随机分为4组，使用两种黏结剂：易壹（EO）和单键2（SB2）进行再接，有无Filtek Z350可流动纳米复合材料。再接4天后，测试牙齿以获得剪切黏结强度（SBS），并计算再接后抗折强度的恢复率（R）。使用SPSS 20.0软件包进行统计分析。
使用可流动纳米复合材料未能提高SBS和R。未使用可流动复合材料的EO组标本的恢复率达到最高值，且显著高于未使用可流动复合材料的SB2组标本（P = 0.046）。
如果碎片与折断牙完美匹配，使用不含复合材料的EO进行再接的牙齿将获得更高的黏结强度。然而，并非所有黏结剂都可用于无复合材料的再接。临床决策应基于两个方面：所选黏结剂是否具有足够的机械强度以及骨折后是否有牙体组织丢失。
