title: Effect of two types of latex gloves and surfactants on polymerization inhibition of three polyvinylsiloxane impression materials.
abstract: BACKGROUND
  Polymerization inhibition of polyvinylsiloxane impression materials has been reported when in sustained contact with some types of latex gloves.
  
  
  OBJECTIVE
  This study examined the polymerization inhibition of 3 polyvinylsiloxane impression materials placed in contact with surfaces subjected to prior contact with gloves or commonly used surfactants.
  
  
  METHODS
  A 2 x 3 x 4 x 2 design was used (n = 20), with 2 types of gloves (powdered and unpowdered), 3 types of polyvinylsiloxane impression materials (Aquasil, Extrude, and Affinis), 4 surfactant conditions (water, soap/water-rinse, alcohol, and unexposed), and 2 ambient temperatures of 22 degrees C and 36 degrees C. After glove exposure to surfactants, a glass surface was subjected to rubbing contact with the treated glove for a standardized time. After drying, automixed polyvinylsiloxane impression materials were dispensed onto the treated surface. Specimens were removed and evaluated for polymerization inhibition at the manufacturer's recommended polymerization time (36 degrees C), or after 15 minutes at 22 degrees C. Specimens were rated as polymerized, or as inhibited if any polyvinylsiloxane residue remained on the slab. A chi-square analysis was used to evaluate the results (alpha=.05).
  
  
  RESULTS
  Setting inhibition was found only with one of the polyvinylsiloxane materials when alcohol was used as a surfactant. At 22 degrees C, the inhibition rate ranged from 95% to 100% for both glove types; at 36 degrees C inhibition ranged from 40% (unpowdered gloves) to 75% (powdered gloves), respectively.
  
  
  CONCLUSIONS
  Under these in vitro conditions, glove exposure to alcohol resulted in polymerization inhibition of 1 of 3 tested polyvinylsiloxane impression materials (Extrude).
authors.affiliation: Department of Restorative Dentistry, School of Dental Medicine, Southern Illinois University, 2800 College Avenue, Alton, IL 62002, USA. aperegr@siue.edu
authors.forename: Alejandro
authors.initials: A
authors.lastname: Peregrina
authors.forename: Martin F
authors.initials: MF
authors.lastname: Land
authors.forename: Phillip
authors.initials: P
authors.lastname: Feil
authors.forename: Connie
authors.initials: C
authors.lastname: Price
mesh_terms: D000438:Alcohols / Q000737:chemistry; D003760:Dental Impression Materials / Q000737:chemistry*; D005932:Gloves, Surgical; D007840:Latex / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature
chemical_list: D000438:Alcohols; D003760:Dental Impression Materials; D007840:Latex; D011108:Polymers; D011145:Polyvinyls; D012833:Siloxanes; D013501:Surface-Active Agents; C034183:vinyl polysiloxane