Periodontal tissue reactions following root canal obturation with an injection‐thermoplasticized gutta‐percha technique

Abstract

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.

Biocompatibility of various root canal filling materials ex vivo

“…In agreement with the literature (Spangberg 1969, Molyvdas et al. 1989), the present findings revealed that gutta‐percha (Obtura) is nontoxic for endodontic use.…”

Thermal irritation of teeth during dental treatment procedures

“…This was probably because the alveolar bone surface was measured instead of the temperature of the root surface or the periodontal ligament and because of the thermal dissipation effect provided by sufficient blood flow of the tooth-supporting tissues 11. Molywdas et al carried out histological observation of the periodontal tissues after warm (160℃) GP filling in two beagle dogs and noted inflammation around the apical foramen and collagen fiber destruction 29. However, such an inflammatory reaction was localized to the apical area and was temporary, and the alveolar bone, root surface, and periodontal ligament appeared histologically normal 29…”

Effect of heat stress on the expression levels of receptor activator of NF‐κB ligand and osteoprotegerin in human periodontal ligament cells

“…The responses of periodontium to lateral condensation and warm vertical compaction techniques have been compared in vivo ; a minor transient inflammatory response has been demonstrated following root filling using warm vertical compaction (Hand et al. 1976, Molyvdas et al. 1989, Castelli et al.…”