Urethane tetramethacrylates: Novel substitutes as resin matrix in radiopaque dental composites

J of Applied Polymer Sci

Mohanan

Sabareeswaran

et al. 2011

Self Cite

Material tissue interactions of a newly developed organically modified ceramic (ormocer)‐based dental restorative composite based on a resin containing mixture of alkoxides of silicone and calcium with polymerizable methacrylate end groups are discussed in this study. Admira, a commercially available ormocer was used as control. A sol–gel process has been used to synthesize organically modified ceramic resins from liquid precursors, which allow one to produce inorganic–organic hybrid polymer materials, which can be functionalized to optimize their physical and chemical properties. Besides, the resulting material properties have been significantly modified by further technological processing such as photochemical curing of the materials by incorporating dimethacrylate groups as organically polymerizable units. Intracutaneous (intradermal) irritation test is found not to elicit any gross signs of tissue reaction. The results of maximization test for delayed hypersensitivity also did not show any adverse skin reaction during the induction or challenge period. Histological analysis after 1, 4, and 12 weeks of subcutaneous implantation of restorative composite resin on the dorsal surface on one side of the spinal column of Wister rats is also found not to reveal any inflammatory response after the implantation. Granuloma and material debris is found to be absent in all three periods of implantation in both test and control. No necrosis was observed around the implanted materials, which were found to be encapsulated by fibrous connective tissue consisting of predominantly fibroblasts and inflammatory cells. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Section: Methodsmentioning

confidence: 99%

“…Subcutaneous implantation is frequently used12 to evaluate biocompatibility of biomaterials. We implanted cured composite discs13–15 subcutaneously in rats and analyzed the inflammatory tissue response from 1 to 12 weeks after implantation using light microscopy. The tissue responses are discussed.…”

Section: Introductionmentioning

confidence: 99%

Biological evaluation of a new organically modified ceramic‐based dental restorative resin

J of Applied Polymer Sci

Mohanan

Sabareeswaran

et al. 2011

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“…The dimethacrylate resin, 1,3 bis methacryloxy 2 (trimethoxy silyl propoxy)propane ( Ormoresin R2) was synthesized by reacting 1.1 mol of glycerol dimethacrylate (MHP; which was synthesized in our lab as reported earlier)9 with 1 mol of chloropropyl trimethoxy silane in presence of benzoyl triethyl ammonium chloride catalyst. The mixture was allowed to react at 50–55°C under constant stirring for 6 h.…”

Section: Methodsmentioning

confidence: 99%

“…Organically modified ceramics resin (50 parts) diluted with TEGDMA (50 parts) was used as the resin matrix and purified, silanated quartz6, 9 was used as the filler for the preparation of restorative paste.…”

Section: Methodsmentioning

confidence: 99%

Studies on shrinkage, depth of cure, and cytotoxic behavior of novel organically modified ceramic based dental restorative resins

J of Applied Polymer Sci

2010

Self Cite

Polymerization shrinkage, depth of cure, and in vitro cytotoxic behavior of dental restorative composite based on inorganic-organic hybrid (organically modified ceramic) resins, containing alkoxides of silicone, calcium, and titanium with various polymeric methacrylate groups were evaluated in this study. Comparison was made between dimethacrylate and tetra methacrylate resins. Statistical evaluation using analysis of variance (single factor) showed that tetramethacrylate organically modified ceramic resin-based composites showed better shrinkage properties. P < 0.05 was considered as statistically significant. Compared to dimethacrylates, tetramethacrylates based composites showed lower depth of cure value. Cytotoxicity characteristics of these composites were mainly depending on the nature of inorganic material incorporated rather than difference in dimethacrylate or tetramethacrylate structure.

“…Inorganic-organic hybrid resin (50 parts) diluted with TEGDMA (50 parts) was used as the resin matrix and purified, silanated quartz [14,15] was used as the filler for the preparation of restorative paste. (-) Diphenyl (2, 4, 6-trimethyl benzoyl) phosphine oxide (TPO) was used as the photo initiator.…”

Section: Characterization Of Compositesmentioning

confidence: 99%

Physical and Mechanical Properties of Visible Light Cure Composites Based on Novel Organically Modified Ceramic Resins

2013

AMR

Replacement of damaged tooth is necessary for proper functioning and better aesthetics. Polymeric composites based on organic resins are the most popular materials used for restoration of damaged tooth though they have many problems like polymerization shrinkage. The post gel polymerization shrinkage causes significant stresses in the surrounding tooth structure and composite tooth bonding leading to premature restoration failure. Other problems such as uncured organic monomers leaching from the dental composites into the surrounding gum tissue have been reported to cause cytotoxic effects, pulpal necrosis, requiring tooth extraction. The present paper describes the studies on visible light cure composites based on organically modified ceramic resins. Effect of different inorganic materials incorporated during resin synthesis on mechanical properties of photo cured composite was evaluated in terms of diametral tensile strength (DTS), compressive strength (CS) and surface hardness (VHN). The better properties of photocured composites based on the novel organically modified ceramic resin which are hybrid inorganic organic resins may be due to the effective bonding between the organic and inorganic parts within the resin.