title: Physical properties and cytotoxicity comparison of experimental gypsum-based biomaterials with two current dental cement materials on L929 fibroblast cells.
abstract: OBJECTIVE
  To evaluate physical properties and cytotoxicity of pure gypsum-based (pure-GYP) and experimental gypsum-based biomaterials mixed with polyacrylic acid (Gyp-PA). The results were compared with calcium hydroxide (CH) and glass ionomer cement (GIC) for application as base/liner materials.
  
  
  METHODS
  Vicat's needle was used to measure the setting time and solubility (%) was determined by percentage of weight loss of the materials following immersion in distilled water. For cytotoxicity test, eluates of different concentrations of materials were obtained and pipetted onto L-929 mouse fibroblast cultures and incubated for 3 days. Cellular viability was assessed using Dimethylthiazol diphenyltetrazolium bromide test to determine the cytotoxicity level. Statistical significance was determined by one-way analysis of variance followed by post hoc test (P < 0.05).
  
  
  RESULTS
  Setting time was significantly higher for pure-GYP and Gyp-PA; solubility test showed a similar tendency (pure-Gyp > Gyp-PA > CH = GIC). The pure-Gyp was found as the least cytotoxic materials at different concentrations. At 100 mg/mL dilutions of materials in growth medium highest cytotoxicity was observed with CH group.
  
  
  CONCLUSIONS
  Cytotoxic effect was not observed with pure-Gyp; application of this novel biomaterial on deeper dentin/an exposed pulp and possibility of gradual replacement of this biodegradable material by dentin like structure would be highly promising.
authors: Graduate Dentist, School of Dental Sciences, Universiti Sains Malaysia, Dental Clinic Besar, Kota Bharu, Kelantan, Malaysia.
authors: Nafsiyah
authors: N
authors: Mahshim
authors: Fazal
authors: F
authors: Reza
authors: Nor Shamsuria
authors: NS
authors: Omar
keywords: Cytotoxicity; lining materials; pure α-hemihydrate gypsum; setting time; solubility
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