Resistance to fracture of intraradicular posts made of biological materials
- PDF / 1,660,075 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 49 Downloads / 213 Views
Open Access
RESEARCH ARTICLE
Resistance to fracture of intraradicular posts made of biological materials Karine Taís Aguiar Tavano1, Adriana Maria Botelho1, Dhelfeson Willya Douglas‑de‑Oliveira1* , Antonio Ferreira Avila2 and Rudolf Huebner2
Abstract Background: The aim was to analyze the fracture resistance of human teeth treated endodontically and restored with posts made of bovine dentin, human dentin, or glass fiber, and to evaluate the fracture pattern. Methods: Cylindrical posts of 1.5 mm in diameter cemented to the roots of human maxillary canines presented a length of 15 mm, cervical diameter of 5–5.5 mm in the mesiodistal direction, and 7–7.5 mm in the vestibule-palatal direction. The groups studied were: Group I—10 glass fiber posts; Group II—10 human dentin posts; Group III—10 bovine dentin posts (self-adhesive resin cement); and Group IV—10 bovine dentin posts (resin-modified glassionomer cements). The coronal part of tooth was restored with a standardized core build-up using composite. All of the groups were submitted to a compression force test and the resistance to fracture was verified using a universal testing machine. The fracture pattern was likewise evaluated. Results: The values of resistance to fracture were: 723.3N in group I, 561.5N in group II, 556.6N in group III, and, 613.27N in group IV. However, no statistically significant difference was observed among the groups. The fractures in groups I and II were most commonly found in the middle/apical third and were considered irreparable. For restored teeth in group III, half of the fractures appeared in the cervical third and were reparable. In group IV, all of the fractures were reparable, with the majority in the cervical thirds. Conclusion: Bovine dentin can be used as intraradicular post to substitute human dentin and glass fiber posts. The greater the malleability of the post, the greater the chances of survival of the teeth when subjected to fracture testing. Keywords: Intraradicular posts, Dentin posts, Biomaterials, Bovine posts Background In healthy teeth, the distribution of occlusal forces occurs in a harmonious manner through the crown, the root canal, and the supporting periodontal tissues. Materials presenting different mechanical properties from those of the dental tissue can cause a high concentration of stress when they are placed in the root canal [1–3].
*Correspondence: [email protected] 1 Department of Dentistry, Federal University of Jequitinhonha and Mucuri Valleys, Rua da Glória, 187, Centro, Diamantinna, MG 39100‑000, Brazil Full list of author information is available at the end of the article
A weakening of the dental structure may be caused by structural modifications imposed by endodontic treatment, lateral force, removal of pulp vitality, and progressive diminishing of the hardness and strength of the tooth, as well as loss of coronal and radicular tooth structure [3, 4], which can, in turn, cause either a root or a coronal fracture. The use of posts set in the inner portion of the root canal has been
Data Loading...
