title: New organosilicon maxillofacial prosthetic materials.
abstract: OBJECTIVE
  The silicone elastomer A-2186 is a widely used maxillofacial prosthetic material. It is a pourable two-component silicone rubber cured by a platinum catalyst. Used as a prosthetic material, A-2186 has short working time and because of its hydrophobic nature, poor adhesion to non-silicone based adhesives. The purpose of this study is to evaluate the physical properties of new prosthetic materials based on methacryloxypropyl-terminated polydimethylsiloxane (MPDS-MF), and to compare the properties with those of A-2186.
  
  
  METHODS
  Hardness, tensile strength, ultimate elongation, tear strength and adhesive bonding strength of MPDS-MF and A-2186 with and without additives were determined and compared. The bonding strengths of the extrinsic colorant carrier with the prosthetic materials were also determined. Statistical analyses were done using a two-way analysis of variance (ANOVA). For significant effects, post-hoc tests were done using the Bonferroni correction.
  
  
  RESULTS
  The hardness of MPDS-MF is similar to A-2186. However, tensile strength, tear strength, ultimate elongation, and adhesive bonding strength of MPDS-MF are higher than those of A-2186.
  
  
  CONCLUSIONS
  MPDS-MF is cured by free radical thermal polymerization and crosslinking. The working time of MPDS-MF, unlike A-2186, is long. The presence of methacrylate groups in MPDS-MF enhances its adhesion to non-silicone based adhesive. Based on the present study, it appears that MPDS-MF is suitable for use in fabricating of clinical prostheses.
authors.affiliation: LAI Laboratories, Inc., 12101 16th Avenue South, Burnsville, MN 55337, USA. jlai@aol.com
authors.forename: J H
authors.initials: JH
authors.lastname: Lai
authors.forename: L L
authors.initials: LL
authors.lastname: Wang
authors.forename: C C
authors.initials: CC
authors.lastname: Ko
authors.forename: R L
authors.initials: RL
authors.lastname: DeLong
authors.forename: J S
authors.initials: JS
authors.lastname: Hodges
mesh_terms: D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D001672:Biocompatible Materials / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004396:Coloring Agents / Q000737:chemistry; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004548:Elasticity; D005609:Free Radicals / Q000737:chemistry; D006244:Hardness; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D011108:Polymers / Q000737:chemistry; D011474:Prosthesis Design; D012826:Silicone Elastomers / Q000737:chemistry; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: C076788:A 2186; D000269:Adhesives; D001672:Biocompatible Materials; D004396:Coloring Agents; D004129:Dimethylpolysiloxanes; D005609:Free Radicals; D011108:Polymers; D012826:Silicone Elastomers