Effect of two types of latex gloves and surfactants on polymerization inhibition of three polyvinylsiloxane impression materials.
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).
Peregrina
Alejandro
A
Department of Restorative Dentistry, School of Dental Medicine, Southern Illinois University, 2800 College Avenue, Alton, IL 62002, USA. aperegr@siue.edu
Land
Martin F
MF
Feil
Phillip
P
Price
Connie
C
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
D000438:Alcohols; D003760:Dental Impression Materials; D007840:Latex; D011108:Polymers; D011145:Polyvinyls; D012833:Siloxanes; D013501:Surface-Active Agents; C034183:vinyl polysiloxane