Munksgaard E C, Højtved L, Jørgensen E H, Andreasen J O, Andreasen F M
Department of Dental Materials and Technology, University Hospital (Rigshospitalet), Copenhagen, Denmark.
Endod Dent Traumatol. 1991 Apr;7(2):73-7. doi: 10.1111/j.1600-9657.1991.tb00188.x.
A method is described, by which the fracture strength of bonded, previously fractured incisors can be measured. The study employed incisors from sheep, which could be obtained in suitable numbers and with limited variation in size. The incisors were fractured parallel to the incisal edge. The mean fracture area +/- SD of central incisors was 8.45 +/- 0.89 mm2 and of lateral incisors 6.50 +/- 0.64 mm2. The enamel area constituted about 30% of the total fracture area. Acid etching of the enamel and bonding of the fractures with an unfilled resin yielded a fracture strength, which was approximately 38% of the fracture strength of fractured teeth restored with acid etching of enamel, Gluma treatment of dentin and bonding with the unfilled resin. Teeth restored in this way, but using the dentin bonding agent Tenure or Scotchbond2 instead of Gluma, exhibited mean fracture strengths which were not significantly different from that obtained when Gluma was employed as the bonding agent. The mean fracture strength by using one of the three bonding agents in combination with acid etching of enamel was about 8 MPa, which is approximately 50% of the fracture strength of intact teeth.
本文描述了一种测量粘结后的先前折断切牙断裂强度的方法。该研究使用了绵羊的切牙，其数量充足且大小差异有限。切牙沿着切缘平行折断。中切牙的平均断裂面积±标准差为8.45±0.89平方毫米，侧切牙为6.50±0.64平方毫米。釉质面积约占总断裂面积的30%。对釉质进行酸蚀并用未填充树脂粘结骨折处，得到的断裂强度约为经釉质酸蚀、牙本质用Gluma处理并用未填充树脂粘结修复的折断牙断裂强度的38%。以这种方式修复的牙齿，但使用牙本质粘结剂Tenure或Scotchbond2代替Gluma，其平均断裂强度与使用Gluma作为粘结剂时获得的断裂强度无显著差异。使用三种粘结剂之一与釉质酸蚀相结合的平均断裂强度约为8兆帕，约为完整牙齿断裂强度的50%。
