Abstract
Objective: evaluate the bond strength of resin cements to new materials for application in intraradicular posts. Material and Methods: Five materials were evaluated: fiberglass, PET, polyethylene, polyacetal and PTFE. Two commercial resin cements (Rely X U200 and Rely X Arc) were applied on the test specimens of the materials (9x3mm) and the bonding was evaluated through the shear bond strength test, where the chisel operated with a load of 1kN and a velocity of 0.5mm/min at the cement/material interface. The data were analyzed by the Shapiro-Wilk test, followed by the two-way analysis of variance, performed with the Bonferroni post-test (?=0.05). Results: The glass fiber was statistically different from all evaluated materials (p<0.05). There was no statistically significant difference between the other materials (p>0.05). Comparing the two cements, a statistical difference was found between Rely X U200 and Arc only for the glass fiber (p=0). Conclusion: PET, polyethylene, polyacetal and PTFE exhibited reduced bond strength compared to the glass fiber.KeywordsResin cement; PET polymer; Polytetrafluoroethylene.
Highlights
The use of intraradicular posts is the main retention method used in coronal restorative material for endodontically treated teeth with pronounced coronal destruction. [1,2] Traditionally, metal posts were used for intraradicular retention and had high survival rates after 10 years
[3] Notwithstanding, due to the high modulus of elasticity of the metal compared to dentin, which increases the risk of root fracture and catastrophic failure, [4] fiberglass posts were introduced as an alternative. [1]
Prefabricated intraradicular fiber posts have been suggested as a promising restorative material due to their favorable aesthetics, biocompatibility, reduced treatment time and modulus of elasticity, which is similar to dentin. [5, 6, 7] Due to their modulus of elasticity, these posts promote better stress distribution along the root axis
Summary
The use of intraradicular posts is the main retention method used in coronal restorative material for endodontically treated teeth with pronounced coronal destruction. [1,2] Traditionally, metal posts were used for intraradicular retention and had high survival rates after 10 years. [3] Notwithstanding, due to the high modulus of elasticity of the metal compared to dentin, which increases the risk of root fracture and catastrophic failure, [4] fiberglass posts were introduced as an alternative. [1]Prefabricated intraradicular fiber posts have been suggested as a promising restorative material due to their favorable aesthetics, biocompatibility, reduced treatment time and modulus of elasticity, which is similar to dentin. [5, 6, 7] Due to their modulus of elasticity, these posts promote better stress distribution along the root axis. [8] fiberglass and carbon posts are widely used in oral rehabilitation. [9, 10, 11] a failure rate of up to 7% is still reported for treatments using these intracanal retainers [12] and no differences have been found in the incidence of root fractures between the use of these retainers and metal posts. [7] new materials that reduce these problems are highly desirable for this application.Poly (ethylene terephthalate), known by the acronym PET and commercially known as DACRON®, available since the 1970s, is widely applied in the medical field, representing the material most used for vascular substitutes in cardiovascular surgery [13,14], due to its good postoperative performance and biocompatibility. [15] PET is a semi-crystalline transparent thermoplastic polymer material, which has become popular in dentistry due to its aesthetics and ductility. [3] Notwithstanding, due to the high modulus of elasticity of the metal compared to dentin, which increases the risk of root fracture and catastrophic failure, [4] fiberglass posts were introduced as an alternative. Prefabricated intraradicular fiber posts have been suggested as a promising restorative material due to their favorable aesthetics, biocompatibility, reduced treatment time and modulus of elasticity, which is similar to dentin. [15] PET is a semi-crystalline transparent thermoplastic polymer material, which has become popular in dentistry due to its aesthetics and ductility. Polyethylene, widely applied in Dentistry and commonly used in prosthetic components and as reinforcing fibers, is the most durable reinforcing fiber available This material consists of aligned polymer chains with low density and good impact resistance. Due to its mechanical properties, biocompatibility, and favorable esthetics, it is applied in removable partial dentures, making it a good alternative for a removable partial prosthesis with chromiumcobalt alloys. [21]
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