Vinyl Polysiloxane 인상재를 이용한 이회 인상법에서 contaminants가 putty-wash 결합력에 미치는 영향
Effect of contaminants on the putty-wash bond strength in two-step reline technique using vinyl polysiloxane impression materials
김무현, 정창모, 전영찬, 황희성,
소속 상세정보
김무현 ( Kim Mu-Hyon ) - Pusan National University College of Dentistry Department of Prosthodontis
정창모 ( Jeong Chang-Mo ) - Pusan National University School of Dentisty Department of Prosthodontics
전영찬 ( Jeon Young-Chan ) - Pusan National University College of Dentistry Department of Prosthodontis
황희성 ( Hwang Hee-Seong ) - Donga University College of Medicine Department of Dentistry
KMID : 0362419960340020266
Abstract
Numerous factors are known to affect the accuracy of elastomeric impression materials. Factor often overlooked is the quality of the bond between putty and wash during corrective reline impression technique. The putty-wash bond strength must be strong enough to overcome the local stress at putty-wash interface. It is not always possible to avoid saliva contamination in making corrective wash impression. And putty preliminary impression material can be used as a template for provisional restoration. Human saliva and the residual monomer of autopolymerizing acrylic resin are thought to affect the bond strength and the failure type. @ES This study examined the effect of contaminants like human saliva, and residual resin monomer on the putty-wash bond strength and the effectiveness of treatment. @EN 1. Of the tested three brands of Vinyl Polysiloxane impession meterial, Express exhibited the greatest bond strength followed by Eamix and Perfect showed the lowest putty-wash bond strength. 2. Coating the putty substrates with human saliva did not produce decreased failure load in all the brands of Vinyl Polysiloxane impression material. 3. Of the three brands of VPS impression material that were exposed to methhylmethacrylate resin(Jet), only the putty-wash bond strength of the Perfect group diminished significantly. Moreover, all the specimens from group C of Perfect exhibited adhesive failure. 4. Exposing the substrates to ethylmethacrylate resin(SNAP) diminished the putty-wash bond strength significantly. With Perfect and Examix, failure occured cohesively through the light-body, whereas with Express, failure occured adhesive-cohesively. 5. Removing approximately 1mm thickness of the contaminated putty interface was the most effective treatment in countering the undesirable effect caused by residual resin monomer. The putty-wash bond strength of the groups that were treated with 1mm even putty reduction was not significantly different from those of control groups. With Perfect and Examix, cleaning the specimens with gauze soaked in 70% isopropyl alcohol increased the putty-wash bond strength, but was not as effective as 1mm even reduction of contaminated putty substrates. With Express, 70% isoproryl alcohol treatment exhibited comparable putty-wash bond strength to that of control group.
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