Molyvdas I, Zervas P, Lambrianidis T, Veis A
Endod Dent Traumatol. 1989 Feb;5(1):32-7. doi: 10.1111/j.1600-9657.1989.tb00334.x.
The thermoplasticized gutta-percha obturation technique is a relatively recent development in endodontics. In this study we evaluated the possible effects of heat transmitted to the periodontal tissues when the Obtura root canal filling device was used in dog teeth. Two 8-month-old beagle dogs were used; 56 root canals of 36 teeth (maxillary incisors and first, second and third premolars of both jaws) were divided into two groups. In Group A 26 root canals were obturated with the lateral condensation technique, while in Group B 30 root canals were obturated using the Obtura device, without sealer. Observation periods were 1, 3, 7, 28 and 56 days. After routine laboratory procedures, hematoxylin-eosin stained sections were examined under a light microscope. In this experimental model the thermoplasticized gutta-percha obturation technique caused a periapical inflammatory reaction at all observation periods. Inflammatory reaction and destruction of collagen fibers were localized in the area around the apical delta, while the alveolar founding bone, the roots of the teeth and the periodontal ligament at the side of the root surfaces remained normal.
热塑牙胶充填技术是牙髓病学中一项相对较新的进展。在本研究中，我们评估了在犬牙中使用Obtura根管充填装置时传递至牙周组织的热量可能产生的影响。选用了两只8个月大的比格犬；36颗牙齿（上下颌的上颌切牙及第一、二、三前磨牙）的56个根管被分为两组。A组26个根管采用侧向加压充填技术进行充填，而B组30个根管使用Obtura装置进行充填，未使用封闭剂。观察期为1、3、7、28和56天。经过常规实验室操作后，苏木精-伊红染色切片在光学显微镜下进行检查。在该实验模型中，热塑牙胶充填技术在所有观察期均引起根尖周炎症反应。炎症反应和胶原纤维破坏局限于根尖分歧周围区域，而牙槽骨、牙根及根面侧的牙周膜保持正常。
