Dimensional stability and detail reproduction of irreversible hydrocolloid and elastomeric impressions disinfected by immersion.

STATEMENT OF PROBLEM Because irreversible hydrocolloid impressions imbibe blood and saliva, immersion rather than spray disinfection may be more effective. Polyether has been shown to be dimensionally sensitive to immersion disinfection. PURPOSE The aim of this study was to determine whether irreversible hydrocolloid and polyether impressions could be disinfected by immersion without sacrificing accuracy and surface quality. MATERIAL AND METHODS Impressions were made of a master mandibular arch containing a crown preparation. Changes between the master and working casts were assessed. Irreversible hydrocolloids (Jeltrate; Palgaflex), a polyether (Impregum F), and an addition silicone (President) were used. Disinfectants were an iodophor (Biocide), a glyoxal glutaraldehyde (Impresept de), and a phenol glutaraldehyde (Sporicidin). The control was without disinfection. Casts were formed in Type IV gypsum. The roughness of working dies was also recorded and an analysis of variance was used for statistical evaluation. Results. Casts from disinfected irreversible hydrocolloid and elastomeric impressions maintained accuracy for anteroposterior and cross arch dimensions where differences from the master was less than 0.1%. Buccolingual and mesiodistal dimensions of working dies (disinfected and control) were 6 to 8 microm larger than the master for addition silicones and 11 to 16 pm for polyethers. The occlusogingival dimension of dies for control and disinfected polyether was 9 pm longer than the master compared with -3 microm for addition silicone. The range of mean surface roughness of working dies made from irreversible hydrocolloids was 1.4 to 1.7 microm and ranged from 0.5 to 0.7 microm for elastomeric impressions. Conclusion. Immersion disinfection of Jeltrate material with iodophor and Palgaflex material with glyoxal glutaraldehyde produced casts and dies as accurate as the control. Control and disinfected elastomeric impression produced dies as clinically accurate and smooth as the master. Disinfection of irreversible hydrocolloid impressions with the glyoxal and phenol glutaraldehyde produced a surface smoother than controls.

[1]  G. Powell,et al.  Accuracy of elastomeric impressions disinfected by immersion. , 1988, Journal of the American Dental Association.

[2]  J. Cleveland,et al.  Recommended Infection-Control Practices for Dentistry, 1993 , 1994 .

[3]  P. Moon,et al.  Linear dimensional changes in dental impressions after immersion in disinfectant solutions. , 1988, The Journal of prosthetic dentistry.

[4]  A. Iost,et al.  Dimensional stability of seven elastomeric impression materials immersed in disinfectants. , 1996, The Journal of prosthetic dentistry.

[5]  A A Caputo,et al.  Effects of disinfectants on dimensional accuracy of impression materials. , 1990, The Journal of prosthetic dentistry.

[6]  J. Burch,et al.  Method for Study of Mandibular Arch Width Change , 1970, Journal of dental research.

[7]  P. L. Fan.  Disinfection of impressions. , 1991, FDI world.

[8]  Steven M. Morgano,et al.  Effects of chemical disinfectant solutions on the stability and accuracy of the dental impression complex. , 1996, The Journal of prosthetic dentistry.

[9]  S. Minagi,et al.  Prevention of acquired immunodeficiency syndrome and hepatitis B. II: Disinfection method for hydrophilic impression materials. , 1987, The Journal of prosthetic dentistry.

[10]  Equipment,et al.  Infection control recommendations for the dental office and the dental laboratory. , 1988, Journal of the American Dental Association.

[11]  R. Leung,et al.  Gypsum casts as a potential source of microbial cross-contamination. , 1983, The Journal of prosthetic dentistry.

[12]  G. H. Johnson,et al.  Accuracy of polyether and addition silicone after long-term immersion disinfection. , 1997, The Journal of prosthetic dentistry.

[13]  J I Nicholls,et al.  Evaluation of mandibular arch width change. , 1981, The Journal of prosthetic dentistry.

[14]  R. Cowan.  Amalgam repair--a clinical technique. , 1983, The Journal of prosthetic dentistry.

[15]  J. McDowell,et al.  A Quantitative Analysis of the Decrease in Width of the Mandibular Arch during Forced Movements of the Mandible , 1961 .

[16]  Durr Dp,et al.  Dimensional stability of alginate impressions immersed in disinfecting solutions. , 1987 .

[17]  G. H. Johnson,et al.  The effect of immersion disinfection of elastomeric impressions on the surface detail reproduction of improved gypsum casts. , 1988, The Journal of prosthetic dentistry.

[18]  T J De Marco,et al.  Mandibular dimensional change. , 1974, The Journal of prosthetic dentistry.

[19]  S. Minagi,et al.  Prevention of acquired immunodeficiency syndrome and hepatitis B. Part III: Disinfection of hydrophilic silicone rubber impression materials. , 1990, The Journal of prosthetic dentistry.

[20]  R. J. Goodkind,et al.  Mandibular flexure in opening and closing movements. , 1973, The Journal of prosthetic dentistry.

[21]  M. Bergman,et al.  Alginate impression materials, dimensional stability and surface detail sharpness following treatment with disinfectant solutions. , 1985, Swedish dental journal.

[22]  V. Merchant,et al.  Dimensional stability of dental impressions after immersion disinfection. , 1986, Journal of the American Dental Association.

[23]  C. Regli,et al.  The phenomenon of decreased mandibular arch width in opening movements. , 1967, The Journal of prosthetic dentistry.

[24]  R G Craig,et al.  Quantitative evaluation of proximal tooth movement effected by wedging: a pilot study. , 1985, The Journal of prosthetic dentistry.

[25]  J. Sapone.  Endodontic abutment prosthesis. , 1973, The Journal of prosthetic dentistry.

[26]  M. Kern,et al.  Three-dimensional investigation of the accuracy of impression materials after disinfection. , 1993, The Journal of prosthetic dentistry.