Dimensional changes in stone models simulating full crown preparations with adjacent teeth resulting from long-term immersion of medium-viscosity addition-type silicone rubber impressions in disinfectant solutions.
If impression materials could be immersed in disinfectant solutions for a longer period, then this form of disinfection would be easier to incorporate into dental preparation procedures. This study investigated the dimensional changes in stone models resulting from immersion of medium-viscosity hydrophilic addition-type silicone rubber impression material in disinfectant solutions for 30 min and 24 h. Impressions of a master die designed to simulate a full crown preparation with adjacent teeth were immersed in 2% glutaraldehyde and 0.55% ortho-phthalaldehyde solutions. The dimensional changes in the mesiodistal and buccolingual dimensions in the stone models were then measured using a three-dimensional coordinate system. It was found that the dimensional changes in the stone models caused by immersion of the impression materials were less than 15 μm. Immersion in 2% glutaraldehyde or 0.55% ortho-phthalaldehyde for 24 h was as clinically acceptable for medium-viscosity hydrophilic addition-type silicone rubber impressions as immersion for 30 min.
Department of Dental Materials, Nihon University School of Dentistry; Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan. hiraguchi.hisako@nihon-u.ac.jp
Hisako
H
Hiraguchi
Yukiko
Y
Iwasaki
Eriko
E
Iwasaki
Hisaji
H
Kikuchi
Hideharu
H
Hirose
Takayuki
T
Yoneyama
D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique; D004202:Disinfectants / Q000737:chemistry*; D005976:Glutaral / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry; D013997:Time Factors; D014783:Viscosity; D009764:o-Phthalaldehyde / Q000737:chemistry*
D003760:Dental Impression Materials; D004202:Disinfectants; C521416:Imprint II; D011145:Polyvinyls; D019279:Resin Cements; D012821:Silanes; D012826:Silicone Elastomers; D012833:Siloxanes; C480691:aquasil; D009764:o-Phthalaldehyde; C061500:Fusion (silane derivative); D005976:Glutaral