Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids
Maurizio Sedda, Andrea Casarotto, Aune Raustia, Andrea Borracchini
Citation Information :
Sedda M, Casarotto A, Raustia A, Borracchini A. Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids. J Contemp Dent Pract 2008; 9 (4):59-66.
Several new irreversible hydrocolloid formulations have recently become available with claims of an improved dimensional stability by the manufacturers. The aim of this study was to evaluate the accuracy of casts made from alginate impression materials poured immediately and after specific storage periods.
Methods and Materials
Five alginates were tested: CA 37 (Cavex); Jeltrate (Dentsply Caulk); Jeltrate Plus (Dentsply Latin America); Hydrogum 5 (Zhermack); and Alginoplast (Heraeus Kulzer). A master model was mounted on a special device and used to obtain the impressions. These impressions were stored at 23°C and 100% relative humidity, then poured with gypsum immediately, and again after 24, 72 and 120 hours. The casts were measured and the data were analyzed by one way analysis of variance (ANOVA) and Tukey test at p<0.05.
Results
The dimensional stability of the alginate impressions was both material and time dependent (p<0.05). After 24 hours of storage, only Alginoplast and Hydrogum 5 comply with the master model (p>0.05). After 72 and 120 hours, only Hydrogum 5 was dimensionally stable (p>0.05).
Conclusion
The dimensional stability of the alginate impressions is influenced by the selected material and the storage time.
Clinical Significance
Alginate impressions should generally be poured immediately. However, some new types of alginate may have the pouring delayed.
Citation
Sedda M, Casarotto A, Raustia A, Borracchini A. Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids. J Contemp Dent Pract 2008 May; (9)4:059-066.
A historical review of hydrocolloids and an investigation of the dimensional accuracy of the new alginates for crown and bridge impressions when using stock trays. Swed Dent J 1984;8:81-95.
Accuracy of casts produced from alginate and hydrocolloid impression materials. J Am Dent Assoc 1976;93:806-8.
The influence of tray type and other variables on the palatal depth of casts made from irreversible hydrocolloid impressions. J Prosthet Dent 2002;87:15-22.
Disinfection procedures: their effect on the dimensional accuracy and surface quality of irreversible hydrocolloid impression materials and gypsum casts. Dent Mater 2002;18:103-10.
Thermal and pH changes, and dimensional stability in irreversible hydrocolloid impression material during setting. Dent Mater J 2002;21:200-9.
The effect of storage time on the accuracy and dimensional stability of reversible hydrocolloid impression material. J Prosthet Dent 2001;86:244-50.
Some effects of disinfecting solutions on the properties of alginate impression material and dental stone. Eur J Prosthodont Restor Dent 2001;9:131-5.
Impression pressures against teeth in a partially edentulous model with a mobile tooth: influence of impression tray design. J Oral Rehabil 2000;27:380-6.
Effect of adhesive drying time on the bond strength of irreversible hydrocolloid to stainless steel. J Prosthet Dent 1999;81:586-90.
Consistency of alginate impression materials and their evaluation. J Oral Rehabil 1999;26:203-7.
Tensile, shear and cleavage bond strengths of alginate adhesive. J Dent 1998;26:617-22.
Dimensional stability and detail reproduction of irreversible hydrocolloid and elastomeric impressions disinfected by immersion. J Prosthet Dent 1998;79:446-53.
Factors affecting dimensional instability of alginate impressions during immersion in the fixing and disinfectant solutions. Dent Mater J 1998;17:294-300.
Using double-poured alginate impressions to fabricate bleaching trays. Oper Dent 1998;23:128-31.
Accuracy of irreversible hydrocolloids (alginates) for fixed prosthodontics. A comparison between irreversible hydrocolloid, reversible hydrocolloid, and addition silicone for use in the syringe-tray technique. Eur J Oral Sci 1998;106:651-60.
The effect of disinfecting alginate and addition cured silicone rubber impression materials on the physical properties of impressions and resultant casts. Eur J Prosthodont Restor Dent 1998;6:103-10.
Effects of long-term storage on properties of an alginate impression material. J Prosthet Dent 1997;77:601-6.
Setting properties of alginate impression materials in dynamic viscoelasticity. J Oral Rehabil 1997;24:761-5.
Disinfection of impressions. Methods and effects on accuracy. NY State Dent J 1997;63:34-6.
Comparing the accuracy of reversible hydrocolloid and elastomeric impression materials. J Am Dent Assoc 1997;128:183-8.
Immersion disinfection of irreversible hydrocolloid impression in pH-adjusted sodium hypochlorite. Part 1: Microbiology. Int J Prosthodont 1996;9:217-22.
Immersion disinfection of irreversible hydrocolloid impressions in pH-adjusted sodium hypochlorite. Part 2: Effect on gypsum casts. Int J Prosthodont 1996;9:223-9.
Dimensional accuracy of three different alginate impression materials. J Prosthodont 1995;4:195-9.
The relation between thermal and pH changes in alginate impression materials. Dent Mater 1995;11:182-5.
Relationship between pH changes and dimensional stability in irreversible hydrocolloid impression material during setting. Int J Prosthodont 1995;8:535-40.
Immersion disinfection of irreversible hydrocolloid impressions with sodium hypochlorite. Part II: Effect on gypsum. Int J Prosthodont 1994;7:315-22.
Immersion disinfection of irreversible hydrocolloid impressions. Part 1: Microbiology. Int J Prosthodont 1994;7:418-23.
Immersion disinfection of irreversible hydrocolloid impressions. Part 2: Effects on gypsum casts. Int J Prosthodont 1994;7:424-33.
, Schwartz RS, Hilton TJ. Immersion disinfection of irreversible hydrocolloid impressions with sodium hypochlorite. Part I: Microbiology. Int J Prosthodont 1994;7:234-8.
Effects of disinfecting irreversible hydrocolloid impressions on the resultant gypsum casts: Part I–Surface quality. J Prosthet Dent 1993;69:250-7.
Effects of disinfecting irreversible hydrocolloid impressions on the resultant gypsum casts: Part III--Dimensional changes. J Prosthet Dent 1993;70:532-7.
Accuracy of irreversible hydrocolloid impression material mixed with disinfectant solutions. J Prosthodont 1993;2:156-8.
Accuracy and dimensional stability of a combined hydrocolloid impression system. J Prosthet Dent 1992;67:873-8.
Disinfection of alginate impression material using disinfectants as mixing and soak solutions. J Dent 1991;19:255-7.
Influence of mixing disinfectant solutions into alginate on working time and accuracy. J Dent 1991;19:186-8.
The dimensional stability of self-disinfecting alginate impressions compared to various immersion regimes. Angle Orthod 1990;60:123-8.
The effects of disinfectants on the dimensional stability of alginate impression materials. Aust Dent J 1990;35:514-7.
Effect of disinfecting solutions on surface texture of alginate and elastomeric impressions. Scand J Dent Res 1990;98:74-81.
Accuracy of impression materials measured with a vertical height gauge. J Oral Rehabil 1990;17:303-10.
Accuracy of alginate and elastomeric impression materials. Scand J Dent Res 1989;97:375-9.
Effect of disinfecting solutions on accuracy of alginate and elastomeric impressions. Scand J Dent Res 1989;97:470-5.
A Reflex Plotter investigation into the dimensional stability of alginate impressions following disinfection by varying regimes employing 2.2 per cent glutaraldehyde. Br J Orthod 1988;15:185-92.
Dimensional stability of alginate impressions immersed in disinfecting solutions. ASDC J Dent Child 1987;54:45-8.
The influence of impression trays on the accuracy of stone casts poured from irreversible hydrocolloid impressions. J Prosthet Dent 1985;54:383-8.
Bonding properties and dimensional stability of hydrocolloid impression systems in fixed prosthodontics. J Prosthet Dent 1985;53:796-800.
Alginate impression materials, dimensional stability and surface detail sharpness following treatment with disinfectant solutions. Swed Dent J 1985;9:255-62.
Syneresis in alginate impression materials. Br Dent J 1975;139:425-30.
ISO 1563:1990-Dental Alginate Impression Material.
Effect of storage period of alginate impressions following spray with disinfectant solutions on the dimensional accuracy and deformation of stone models. Dent Mater J 2005;24:36-42.
The effect of a range of disinfectants on the dimensional accuracy of some impression materials. Eur J Prosthodont Restor Dent 2004;12:154-60.
Effect of rinsing alginate impressions using acidic electrolyzed water on dimensional change and deformation of stone models. Dent Mater J 2003;22:494-506.
Factors that affect the adhesion of two irreversible hydrocolloid materials to two custom tray materials. J Prosthet Dent 2002;88:423-30.
Laser digitization of casts to determine the effect of tray selection and cast formation technique on accuracy. J Prosthet Dent 2002;87:204-9.