title: Silorane resin supports proliferation, differentiation, and mineralization of MLO-A5 bone cells in vitro and bone formation in vivo.
abstract: Methyl methacrylate used in bone cements has drawbacks of toxicity, high exotherm, and considerable shrinkage. A new resin, based on silorane/oxirane chemistry, has been shown to have little toxicity, low exotherm, and low shrinkage. We hypothesized that silorane-based resins may also be useful as components of bone cements as well as other bone applications and began testing on bone cell function in vitro and in vivo. MLO-A5, late osteoblast cells, were exposed to polymerized silorane (SilMix) resin (and a standard polymerized bisGMA/TEGDMA methacrylate (BT) resin and compared to culture wells without resins as control. A significant cytotoxic effect was observed with the BT resin resulting in no cell growth, whereas in contrast, SilMix resin had no toxic effects on MLO-A5 cell proliferation, differentiation, nor mineralization. The cells cultured with SilMix produced increasing amounts of alkaline phosphatase (1.8-fold) compared to control cultures. Compared to control cultures, an actual enhancement of mineralization was observed in the silorane resin-containing cultures at days 10 and 11 as determined by von Kossa (1.8-2.0 fold increase) and Alizarin red staining (1.8-fold increase). A normal bone calcium/phosphate atomic ratio was observed by elemental analysis along with normal collagen formation. When used in vivo to stabilize osteotomies, no inflammatory response was observed, and the bone continued to heal. In conclusion, the silorane resin, SilMix, was shown to not only be non cytototoxic, but actually supported bone cell function. Therefore, this resin has significant potential for the development of a nontoxic bone cement or bone stabilizer.
authors.affiliation: Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas, Missouri 64108-2784, USA.
authors.forename: J David
authors.initials: JD
authors.lastname: Eick
authors.forename: Cielo
authors.initials: C
authors.lastname: Barragan-Adjemian
authors.forename: Jennifer
authors.initials: J
authors.lastname: Rosser
authors.forename: Jennifer R
authors.initials: JR
authors.lastname: Melander
authors.forename: Vladimir
authors.initials: V
authors.lastname: Dusevich
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Weiler
authors.forename: Bradley D
authors.initials: BD
authors.lastname: Miller
authors.forename: Kathleen V
authors.initials: KV
authors.lastname: Kilway
authors.forename: Mark R
authors.initials: MR
authors.lastname: Dallas
authors.forename: Lianxing
authors.initials: L
authors.lastname: Bi
authors.forename: Elisabet L
authors.initials: EL
authors.lastname: Nalvarte
authors.forename: Lynda F
authors.initials: LF
authors.lastname: Bonewald
mesh_terms: D000818:Animals; D001843:Bone Cements / Q000494:pharmacology*; D002113:Calcification, Physiologic / Q000187:drug effects*; D002454:Cell Differentiation / Q000187:drug effects*; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects*; D003094:Collagen / Q000096:biosynthesis; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D051379:Mice; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism*; D010012:Osteogenesis / Q000187:drug effects*; D062047:Silorane Resins
chemical_list: D001843:Bone Cements; D017220:Dentin-Bonding Agents; D062047:Silorane Resins; D003094:Collagen