Abstract
BackgroundThe 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.MethodsCylindrical 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 glass-ionomer 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.ResultsThe 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.ConclusionBovine 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.
Highlights
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
The present study aims to analyze the fracture resistance of human teeth treated endodontically and restored with posts made of bovine dentin, human dentin, or glass fiber dentin, and evaluate the fracture pattern and whether or not it is reparable
The use of a bovine post as an intracoronary retention aid should be encouraged by clinicians since the post used in this study presented satisfactory fracture resistance, was easy to obtain, biosafe, and both histochemically and anatomically similar to human teeth [11, 12]
Summary
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. The distribution of occlusal forces occurs in a harmonious manner through the crown, the root canal, and the supporting periodontal tissues. The use of posts set in the inner portion of the root canal has been widely discussed in the literature, in which the only apparent point of consensus is the retention increasing of the coronal restoration [1, 2, 5]. The hardness and resistance of the Tavano et al BMC Oral Health (2020) 20:300 materials are parameters that influence the biomechanical behavior of the posts in the inner portion of the root canal [2, 6, 7]
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