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Effect of light absence or attenuation on biaxial flexural strength of dual‐polymerized resin cements after short‐ and long‐term storage
Author(s) -
Lima Renally B. W.,
MurilloGómez Fabián,
Sartori Cristiana G.,
De Góes Mário F.
Publication year - 2018
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12427
Subject(s) - materials science , composite material , flexural strength , adhesive , curing (chemistry) , cement , polymerization , composite number , polymer , layer (electronics)
Objective To evaluate whether biaxial flexural strength (BFS) of dual resin cements is affected by light absence or attenuation, storage time, or cements' chemical nature. Materials and methods One hundred and twenty disk‐shaped specimens were made from each cement (non‐self‐adhesive cement and self‐adhesive cement) using Teflon molds on a controlled temperature surface (35°C). Specimens were polymerized as follows ( N = 30): self‐cured, directly light‐cured, light‐cured at a distance of 6 mm between the light tip and the specimen, and through a 6‐mm thick composite resin barrier (indirectly light‐cured). Each group was divided ( N = 10) for storage purposes (15 minutes, 24 hours, and 6 months). Specimens were placed into a biaxial‐flexure jig and a vertical load was applied until failure. The BFS values were subjected to generalized linear models statistical analysis and Weibull distributions (α = 0.05). Results After 15 minutes aging, neither material achieved enough polymerization to perform the BFS test when polymerized using the self‐curing mode. The self‐adhesive product demonstrated much lower variation in strength with storage time than did the non‐self‐curing cement. Conclusions Attenuated/light‐curing reduced BFS values only for 15‐minutes storage period for both materials. Flexural strength of the self‐adhesive cement was less affected by light absence/attenuation and storage time. Clinical significance Biaxial flexural strength of a self‐adhesive resin cement is less sensitive to variation in light application and storage time than is a non‐self‐adhesive cement.