Repair of temporary fixed dental prostheses using a flowable resin composite: Effect of material, bonding, and aging

Ruwaida Z Alshali; Dalea M Bukhary; Mohammed A AlQahtani; Naflaa O Alenazi; Abeer H Alzahrani; Hayam A Alobaid

doi:10.1016/j.sdentj.2020.09.007

Repair of temporary fixed dental prostheses using a flowable resin composite: Effect of material, bonding, and aging

Saudi Dent J. 2021 Nov;33(7):495-502. doi: 10.1016/j.sdentj.2020.09.007. Epub 2020 Oct 17.

Authors

Ruwaida Z Alshali¹, Dalea M Bukhary¹, Mohammed A AlQahtani², Naflaa O Alenazi³, Abeer H Alzahrani³, Hayam A Alobaid³

Affiliations

¹ Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
² Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
³ Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.

Abstract

Objectives: Assessment of the effect of aging and bonding on the reparability of different temporary crown and bridge materials using a flowable resin composite.

Methods: The materials used included two bis-acryl and two polymethylmethacrylate materials. The materials were aged either dry, in distilled water, or in a 75% ethanol/water solution. Each group was divided into three subgroups (n = 6) according to the bonding method: application of a universal adhesive, application of a universal primer followed by a universal adhesive, or no bonding. Materials were repaired with a light-cure flowable resin composite; then, they were subjected to thermocycling and tested by shear bond strength. The data were analysed using three-way ANOVA, one-way ANOVA, and Tukey post hoc tests (α = 0.05).

Results: The shear bond strength was significantly higher for bis-acryl compared to polymethylmethacrylate materials (p < 0.001). In terms of aging conditions, shear bond strength was in the order of 75% ethanol/water solution < dry < water. The application of bonding agents significantly increased the shear bond strength of polymethylmethacrylate-based materials (p < 0.001). The difference between water and dry storage was insignificant (p = 0.558); however, storage in a 75% ethanol/water solution showed significantly lower values compared to both dry and water storage in most of experimental groups (p < 0.001). Polymethylmethacrylate-based materials mainly demonstrated adhesive failure, while bis-acryl materials predominantly showed cohesive failure.

Conclusion: The bond strength of a light-cure flowable resin composite is significantly higher with bis-acryl compared to that with polymethylmethacrylate-based substrates. Aging in water does not have a significant effect; however, the 75% ethanol/water solution tends to negatively affect repairability. The application of different bonding agents positively affects the repair strength, especially for polymethylmethacrylate-based substrates.

Keywords: Aging; Bonding agent; Provisional; Repair; Resin composite; Temporary dental prostheses.