Photoinitiation dental resins

IKE 08] Ikemura K., Ichizawa K., Yoshida M. et al, UV-VIS spectra and photoinitiation behaviors of acylphosphine oxide and bisacylphosphine oxide derivatives in unfilled, light-cured dental resins , Dental Materials Journal, vol. 27, no. 6, pp. 765-774, 2008. 

Additional improvements on the degree of conversion of the adhesive systems were observed with new and less hydrophobic initiators of polymerization. Camphorquinone and aromatic amines are the most commonly used photoinitiator systems for light-activated dental resins, but they can be excessively hydrophobic making it difficult to activate the more hydrophilic monomers at the adhesive systems. The addition of alternative initiators such as 1-phenyl-1,2-propanedione (PPD), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (Lucerin-TPO) and bisacylphosphine oxide (BAPO) improve resin polymerization within hydrophilic domains and reduce susceptibility to inactivation by... 

The rigid structure of the BOSS cubes can be beneficially used in the development of low-shrinkage dental composite resins. Octafunctionalized methacrylate-based compounds were incorporated in commonly used photoinitiated dental formulations. The study showed that the shrinkage of nanocomposites decreased and the nanocomposites incorporated with BOSS showed improved mechanical properties at low BOSS content [101]. 

Multifunctional photoinitiators, (II), were prepared by Sommerlade et al. (2) for radiation-curable dental compositions using UV light. A Norrish Type visible-light-sensitive multifunctional ketopinic amide derivative attached to a modified amino-silanated resin, (III), was prepared by Condon et al. (3) and used as a macroinitiator in dental applications. 

Y.J. Park, K.H. Chai, H.R. Rawls, Development of a new photoinitiation system for dental light-cure composite resins. Dent. Mater. 15 (1999) 120-127. 

ARI 09] Arikawa H., Takahashi H., Kanie T. et al, Effect of various visible light photoinitiators on the polymerization and color of light-achvated resins , Dental Materials Journal, vol. 28, no. 4, pp. 454-460, 2009. 

RUE 97] Rueggeberg F.A., Ergle J.W., Lockwood P.E., Effect of photoinitiator level on properties of a light-cured and post-cure heated model resin system . Dental Materials, vol. 13, pp. 360-364, 1997. 

The basic components of a dental bonding system include a primer, the adhesive resin, an organic solvent and polymerization initiators. Primers contain hydrophilic blends of resin monomers/co-monomers. Adhesive resins contain blends of hydrophobic monomers/co-monomers. Solvents are added to the systems to enhance resin infiltration into the tissue, whereas photoinitiators are commonly used for convenient operator-controlled photopolymerization of the adhesive. Other ingredients such as fluoride, glutaraldehyde, antimicrobials are also commonly added to the mixture in an attempt to further protect or strengthen the adhesive interface. 

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