Resistance to fracture of intraradicular posts made of biological materials

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 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. 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.

Comparison of the Fracture Resistance of Root-Canal-Treated Premolars Obturated With Dissimilar Materials: An In Vitro Study

“…The presence of a post in the root-filled tooth can impact its fracture resistance. Some research demonstrated that teeth with intraarticular posts may have lower fracture resistance compared to those without posts [ 22 , 23 ]. However, it's essential to consider the individual case and the type of post used.…”

The Impact of Bonding Agents and Bone Defects on the Fracture Resistance of Reattached Vertically Root-Fractured Teeth

“…The third group had V-shaped defects measuring 5 mm deep and 3 mm wide at the coronal area on one proximal surface (Figure 1). Based on prior research findings [28,29], with an effect size (d) of 1.4, α set at 0.05, and a power of 1 − β at 0.80, the sample size was determined to be 10 per sub-group, resulting in a total of 30 specimens per group (Figure 2). The calculation for the sample size utilized G* Power software (version 3.1; the University of Dusseldorf) [30].…”

Autogenous biological restoration: clinical and social importance

“…A provisional restoration in acrylic resin (Dencrilay Pó, Dencril, Santo André, SP, Brazil) was made to maintain tooth stability in the arch and promote protection and function of the element 16 until the final restoration was performed (Figure 2B). The laboratory steps for the cutting of the autogenous fragment were firstly the separation of tooth 18 in a coronal portion, for cutting the fragment, and in a root portion, which was stored for other purposes, including confectioning biological pins (Alcântara et al, 2010;Tavano et al, 2020) (Figure 3A). For cutting the fragment, diamond tips were used, in high rotation, under intense refrigeration.…”