Bolhari Behnam, Mojazi Amiri Elham, Kermanshah Hamidreza, Ghabraei Sholeh, Jamei Azad
Associate Professor, Dental Research Center Dentistry Research Institute, Department of Endodontics, Dental School, Tehran University of Medical Sciences,Tehran, Iran.
Associate Professor, Dental Research Center Dentistry Research Institute, Department of Restorative Dentistry, Dental School, Tehran University of Medical Sciences,Tehran, Iran.
J Dent (Tehran). 2015 Feb;12(2):125-33.
The purpose of this ex- vivo study was to evaluate the fracture resistance of simulated immature teeth, obturated with Gutta-percha or Resilon and reinforced by either composite resin or fiber post.
Eighty-four human maxillary incisors were divided into seven groups (n=12). Teeth in all groups were prepared until Peeso #5 (1.5mm) could be passed through the apex. Root ends received 4mm of MTA plug as an apical barrier. Groups received the followings: 1.Gutta-percha, 2.Resilon, 3.Gutta-percha + composite resin, 4.Resilon + composite resin, 5.Gutta-percha + fiber post, 6.Resilon + fiber post and 7.No obturation (control group). Access openings were filled with composite resin. Specimens were then subjected to oblique load using Instron Testing Machine. The mean peak load at fracture was recorded and analyzed using ANOVA.
Experimental groups had a significantly more fracture resistance than the control group (P< 0.05). No significant difference was seen between experimental groups. Teeth reinforced by fiber post showed favorable fracture resistance.
Treatment plans used in this study increase the fracture resistance of immature teeth. Use of fiber posts in immature teeth, may be the most favorable clinically applicable technique.
本体外研究的目的是评估用牙胶或热塑性弹性体根管充填并采用复合树脂或纤维桩增强的模拟未成熟恒牙的抗折性能。
84颗人上颌切牙被分为7组（每组n = 12）。所有组的牙齿均预备至能通过5号Peeso钻（1.5mm）达根尖。根尖孔用4mm的MTA封闭作为根尖屏障。分组如下：1.牙胶；2.热塑性弹性体根管充填材料；3.牙胶+复合树脂；4.热塑性弹性体根管充填材料+复合树脂；5.牙胶+纤维桩；6.热塑性弹性体根管充填材料+纤维桩；7.不充填（对照组）。髓腔入口用复合树脂充填。然后使用Instron试验机对样本施加斜向载荷。记录骨折时的平均峰值载荷，并使用方差分析进行分析。
实验组的抗折性能明显高于对照组（P<0.05）。实验组之间未见显著差异。用纤维桩增强的牙齿显示出良好的抗折性能。
本研究中使用的治疗方案提高了未成熟恒牙的抗折性能。在未成熟恒牙中使用纤维桩可能是临床上最有利的适用技术。
