Influence of chloramine-T disinfection on elastomeric impression stability

ABSTRACT

Objective: The aim of this study was to evaluate the stability of elastomer through detail reproduction and its dimensional stability (DS) after disinfection with 0.2% chloramine-T. Materials and Methods: The elastomeric impression dental materials used in this study were polydimethylsiloxane (Oranwash L), polyvinyl siloxane (Express), polysulfide (Permlastic), and polyether (Impregum Soft). The entire press procedure was performed on a matrix in accordance with the ISO 4823. Detail reproduction was analyzed using an optical microscope (Stereozoom Microscope) over the 20-μm line with 25 mm of length at a magnification of ×4. DS was measured using an optical microscope (Scanning Tunneling Microscope) by subtracting the distance between the lines X and X’ over the 20-μm line on the matrix (DM) from the distance between the lines on the impression material (DI) divided by DM and multiplied by 100 establishing the equation: DS = ([DI – DM]/DM) ×100; then, 100% was added to the results of the equation. The detail reproduction values were subsequently subjected to descriptive analysis by percentage (%), and the DS values (%) were submitted to Kolmogorov–Smirnov test, two-way ANOVA (material × disinfectant), and Tukey’s test (α = 0.05). Results: All elastomeric impression materials showed 100% of detail reproduction, regardless of the disinfection procedure. Polysulfide (not disinfected) and polysulfide and polydimethylsiloxane (after disinfection with 0.2% chloramine-T) showed the smaller mean values of DS. Conclusion: According to the stability properties analyzed, chloramine-T can be used for disinfection of elastomer molds.

Key words:

Detail reproduction - dimensional stability - disinfectant solution - elastomeric impression materials

• REFERENCES

• 1 Kim KM, Lee JS, Kim KN, Shin SW. Dimensional changes of dental impression materials by thermal changes. J Biomed Mater Res 2001; 58: 217-20
• 2 Vitti RP, Correr-Sobrinho L, Sinhoreti MA. Dimensional accuracy of stone casts made by a monophase impression technique using different elastomeric impression materials. Braz J Oral Sci 2011; 10: 175-9
• 3 Council on Dental Materials, Instrument, and Equipment, Council on Dental Practice, Council on Dental Therapeutics. Infection control recommendations for the dental office and the dental laboratory. J Am Dent Assoc 1996; 127: 672-80
• 4 Egusa H, Watamoto T, Abe K, Kobayashi M, Kaneda Y, Ashida S. et al. An analysis of the persistent presence of opportunistic pathogens on patient-derived dental impressions and gypsum casts. Int J Prosthodont 2008; 21: 62-8
• 5 Bustos J, Herrera R, González U, Martínez A, Catalán A. Effect of immersion disinfection with 0.5% sodium hypochlorite and 2% glutaraldehyde on alginate and silicone: Microbiology and SEM study. Int J Odontostomat 2010; 4: 169-77
• 6 Mathew S, Alani MM, Nair KN, Haridas S, Reba PB, Thomas SA. et al. Radiofrequency glow discharge as a mode of disinfection for elastomeric impression materials. J Contemp Dent Pract 2017; 18: 131-6
• 7 Melilli D, Rallo A, Cassaro A, Pizzo G. The effect of immersion disinfection procedures on dimensional stability of two elastomeric impression materials. J Oral Sci 2008; 50: 441-6
• 8 Bhat VS, Shetty MS, Shenoy KK. Infection control in the prosthodontic laboratory. J Indian Prosthodont Soc 2007; 7: 62-5
• 9 Leung RL, Schonfeld SE. Gypsum casts as a potential source of microbial cross-contamination. J Prosthet Dent 1983; 49: 210-1
• 10 Abdullah MA. Surface detail, compressive strength, and dimensional accuracy of gypsum casts after repeated immersion in hypochlorite solution. J Prosthet Dent 2006; 95: 462-8
• 11 Carvalhal CI, Mello JA, Sobrinho LC, Correr AB, Sinhoreti MA. Dimensional change of elastomeric materials after immersion in disinfectant solutions for different times. J Contemp Dent Pract 2011; 12: 252-8
• 12 Pereira JR, Murata KY, Valle AL, Ghizoni JS, Shiratori FK. Linear dimensional changes in plaster die models using different elastomeric materials. Braz Oral Res 2010; 24: 336-41
• 13 Peutzfeldt A, Asmussen E. Effect of disinfecting solutions on surface texture of alginate and elastomeric impressions. Scand J Dent Res 1990; 98: 74-81
• 14 ISO 4823. Dentistry: Elastomeric Impression Materials. Geneva, Switzerland: International Organization for Standardization; 2000
• 15 Guiraldo RD, Moreti AF, Martinelli J, Berger SB, Meneghel LL, Caixeta RV. et al. Influence of alginate impression materials and storage time on surface detail reproduction and dimensional accuracy of stone models. Acta Odontol Latinoam 2015; 28: 156-61
• 16 Guler U, Budak Y, Ruh E, Ocal Y, Canay S, Akyon Y. et al. Effect of mixing techniques on bacterial attachment and disinfection time of polyether impression material. Eur J Dent 2013; 7: S54-9
• 17 Sczepanski F, Sczepanski CR, Berger SB, Consani RL, Gonini-Júnior A, Guiraldo RD. et al. Effect of sodium hypochlorite and peracetic acid on the surface roughness of acrylic resin polymerized by heated water for short and long cycles. Eur J Dent 2014; 8: 533-7
• 18 Taylor RL, Wright PS, Maryan C. 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
• 19 Omidbakhsh N. A new peroxide-based flexible endoscope-compatible high-level disinfectant. Am J Infect Control 2006; 34: 571-7
• 20 Guiraldo RD, Borsato TT, Berger SB, Lopes MB, Gonini Jr A, Sinhoreti MA. et al. Surface detail reproduction and dimensional accuracy of stone models: Influence of disinfectant solutions and alginate impression materials. Braz Dent J 2012; 23: 417-21
• 21 Berg JC, Johnson GH, Lepe X, Adán-Plaza S. Temperature effects on the rheological properties of current polyether and polysiloxane impression materials during setting. J Prosthet Dent 2003; 90: 150-61
• 22 Petrie CS, Walker MP, O'mahony AM, Spencer P. Dimensional accuracy and surface detail reproduction of two hydrophilic vinyl polysiloxane impression materials tested under dry, moist, and wet conditions. J Prosthet Dent 2003; 90: 365-72
• 23 German MJ, Carrick TE, McCabe JF. Surface detail reproduction of elastomeric impression materials related to rheological properties. Dent Mater 2008; 24: 951-6
• 24 Donovan TE, Chee WW. A review of contemporary impression materials and techniques. Dent Clin North Am 2004; 48: vi-vii 445-70
• 25 Shah S, Sundaram G, Bartlett D, Sherriff M. The use of a 3D laser scanner using superimpositional software to assess the accuracy of impression techniques. J Dent 2004; 32: 653-8
• 26 Lacy AM, Fukui H, Bellman T, Jendresen MD. Time-dependent accuracy of elastomer impression materials. Part II: Polyether, polysulfides, and polyvinylsiloxane. J Prosthet Dent 1981; 45: 329-33
• 27 Johnson GH, Chellis KD, Gordon GE, Lepe X. Dimensional stability and detail reproduction of irreversible hydrocolloid and elastomeric impressions disinfected by immersion. J Prosthet Dent 1998; 79: 446-53
• 28 Suprono MS, Kattadiyil MT, Goodacre CJ, Winer MS. Effect of disinfection on irreversible hydrocolloid and alternative impression materials and the resultant gypsum casts. J Prosthet Dent 2012; 108: 250-8