Abstract
•The impact of PDT on the push out bond strength on the fiber post cemented to root dentin was sought.•A total of ten studies were included.•PDT has no effect on improving bond strength of fiber post to root dentin.
This systematic review documents the up-to-date evidence on the efficacy of photodynamic therapy (PDT) on the push-out bond strength of fiber posts cemented to root dentin.
The focused PICO question was: “What impact does PDT have on the push-out bond strength of fiber posts cemented to root dentin?” This systematic review followed the guidelines and recommendations reported in the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) guidelines chart. An electronic search was performed in MEDLINE/PubMed, SCOPUS, Web of Science, and Embase from January 1980 up to and including January 2020. Heterogeneity was calculated for push-out bond strength by means of the Chi-square test and I2 statistics. For meta-analyses, if the I2 was higher than 50 %, a random effects model was used, otherwise a fixed effects model for I2 ≤50 % was applied. A p-value <0.05 was set for significant heterogeneity. Forest plots were computed reporting standard mean differences (SMD) of outcomes and 95 % confidence intervals (CI).
In total, ten studies were included, all of wich demonstrated medium risk of bias. All studies tested the push-out bond strength by means of a universal testing machine with applying a load ranging between 0.5 and 1 mm/min speed. Of the 10 studies, nine (90 %) indicated that PDT had no effect on push-out bond strength of fiber posts to root dentin. Only one study indicated that PDT significantly improved the bond strength when compared with other control groups. The overall mean difference for push out bond strength showed no statistically significant difference between PDT and the control group (SMD = -1.11 [-3.25, 1.02], Z=-1.02, p = 0.305).
This systematic review concludes that PDT has no effect on improving the push-out bond strength of fiber posts to root dentin.