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A new resin matrix for dental composite having low volumetric shrinkage
Author(s) -
Kim Y.,
Kim C. K.,
Cho B. H.,
Son H. H.,
Um C. M.,
Kim O. Y.
Publication year - 2004
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30023
Subject(s) - shrinkage , triethylene glycol , diluent , curing (chemistry) , materials science , propane , dental composite , composite number , polymerization , composite material , resin composite , dentin , polymer chemistry , chemistry , polymer , nuclear chemistry , organic chemistry
The applications of dental restorative composite resins containing 2,2 bis [4‐(2‐hydroxy‐3‐methacryloyloxy propoxy) phenyl] propane (Bis‐GMA), as a base resin, and triethylene glycol dimethacrylate (TEGDMA), as a diluent, are often limited in dentistry due to the relatively large amount of volumetric shrinkage that occurs during the curing reaction. In this study, various new resin matrices were examined for use as dental composites in order to reduce the amount of volumetric shrinkage that occurs in dental composites as a result of curing. Bis‐GMA derivatives were synthesized by substituting methyl groups for hydrogen on the phenyl ring. The derivatives of TEGDMA with different chain lengths or reactive groups were also examined. The molecular structural changes in the TEGDMA derivatives were not effective in reducing the level of volumetric shrinkage. The resin matrix containing a Bis‐GMA derivative and TEGDMA showed a reduced amount of volumetric shrinkage in proportion to the number of methyl groups on the phenyl rings. Polymerization with a mixture of Bis‐GMA, its derivatives and a diluent is a promising strategy for obtaining a polymer with a low amount of volumetric shrinkage. A comparison of the volumetric shrinkage of dental composites containing Bis‐GMA, TMBis‐GMA (2,2‐ bis [3,5‐dimethyl, 4‐(2‐hydroxy‐3‐methacryloyloxy propoxy) phenyl] propane)), and TEGDMA with that prepared from a Bis‐GMA and TEGDMA mixture showed that the volumetric shrinkage reduction in the new resin was approximately 50%. Furthermore, the mechanical strength of the former was higher than that of the latter. © 2004 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 70B: 82–90, 2004