[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit ::
Main Menu
Journal Information::
Editorial Policies::
Articles archive::
For Authors::
Contact us::
Site Facilities::
::
Search in website

Advanced Search
Receive site information
Enter your Email in the following box to receive the site news and information.
Last site contents
:: Contact Us
:: Volume 29, Issue 4 (10-2017) ::
J Iran Dent Assoc 2017, 29(4): 149-157 Back to browse issues page
Hardness and Surface Detail Reproduction of Gypsum Casts Retrieved from Addition Silicone Impressions Disinfected for Different Time Points
Sara Koosha1 , Shabnam Pourhaghani2 , Kimia Attar * 3
1- Assistant Professor, Department of Fixed Prosthodontics, Member of Implant Research Center, Islamic Azad University of Medical Sciences, Dental Branch, Tehran, Iran
2- Dentist, Private Office, Tehran, Iran
3- Assistant Professor, Department of Fixed Prosthodontics, Member of Implant Research Center, Islamic Azad University of Medical Sciences, Dental Branch, Tehran, Iran , kimiattar@yahoo.com
Abstract:   (3542 Views)
Background and Aim: Bacterial colonization occurs following contamination of impression materials with blood and saliva. However, not all disinfecting agents are compatible with the impression materials and may cause changes in the resultant casts. The purpose of this study was to assess the impact of various immersion time of addi-tion silicon impressions in different disinfecting solutions on the surface hardness and detail reproduction of gypsum casts.
Materials and Methods: In this in vitro experiment, 84 addition silicone impressions were divided into seven groups (n=12). One group served as the control and the other groups were disinfected with 1% sodium hypochlorite, 2.4% glutaraldehyde, and 5% povidone-iodine for 5 and 30 minutes. Impressions were poured with type IV dental stone. The Knoop hardness value (KHN) was measured by microhardness tester. Surface detail reproduction, casts were inspected under a light microscope at X10 magnification. The surface hardness data was analyzed using two way ANOVA, Tuk-ey`s test, Dunnett`s, One way ANOVA and t-test. The detail reproduction results were analyzed using the Kruskal-Wallis test.
Results: Immersion in povidone-iodine for 5 minutes and in sodium hypochlorite and glutaraldehyde for 30 minutes significantly lowered the KHN of resultant casts (P=0.001). No other significant differences were noted (P>0.05). No significant difference was found in detail reproduction between groups (P>0.05).
Conclusion: Increasing the immersion time of impressions in povidone-iodine increased the hardness of casts. Thus, 5% povidone-iodine is a more suitable disinfecting solution for longer immersion time given that other properties of the casts are not affected.
Keywords: Gypsum, Hardness, Disinfectants, Dental impression materials
Full-Text [PDF 359 kb]   (1886 Downloads)    
Type of Study: Original | Subject: Prosthodontics
References
1. Shillingburg HT, et al. Fundamentals of fixed prosthodontics.4th ed. St louis: Mosby Inc;2012:1-10.
2. Oda Y, Matsumoto T, Sumii T. Evaluation of dimensional stability of elastomeric impression materials during disinfection. Bull Tokyo Dent Coll. 1995 Feb;36(1):1-7.
3. Proença JS, Suzuki MM, Costa SC, Hirata BS, Lopes MB, Contreras EF. Influence of different water types on the physical and mechanical properties of gypsum. Braz. J. Oral Sci. 2015 Sep; 14(3): 199-203.
4. Sinavarat P, Visayrath S. Effects of disinfection procedures on surface quality of compound impressions and the resultant gypsum casts. M Dent J. 2014 Jan-Apr; 34(1):19-27.
5. Abass S.M. The Effect of Disinfectant on the Microstructure of Dental Stone at Different Time Intervals. MDJ 2007; 4(2):199-205.
6. Hamedi Rad F, Ghaffari T. Evaluation of Wear of Type III Stone Casts Made From Alginate Impressions after Being Disinfected. J Mash Dent Sch. 2011;35(2):65-72.
7. Pal PK, Kamble SS, Chaurasia RR, Chaurasia VR, Tiwari S, Bansal D. Evaluation of Different Disinfactants on Dimensional Accuracy and Surface Quality of Type IV Gypsum Casts Retrieved from Elastomeric Impression Materi-als. J Int Oral Health. 2014 Jun;6(3):77-81.
8. Nilner K, Owall B. Reproduction of details using dental stones and investment material in impressions of elastomers and waxe. Swed Dent J. 1982;6(6):249-55.
9. 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 Dec; 50(4): 441-6.
10. Bhat V, Shenoy K, Shetty S. Evaluation of efficacy of microwave oven irradiation in disinfection of patient derived dental cast. Int J Infect Control. 2012;8(3):1-4.
11. Sabouhi M, Khodaeian N, Ataei E, Kiani F. The Effect of Addition of Calcium Hypochlorite Disinfectant on Setting Expansion and Surface Hardness of Dental Stone. J Islamic Dent Assoc Iran (JIDAI). 2014 Spring;26(2):21-5.
12. Ahila SC, Thulasingam C. Effect of disinfection on gypsum casts retrieved from addition and condensation silicone impressions disinfected by immersion and spray methods. SRM J Res Dent Sci. 2014 July-September; 5(3):163-9.
13. Amin WM, Al-Ali MH, Al Tarawneh SK, Taha ST, Saleh MW, Ereifij N. The Effects of Disinfectants on Dimensional Accuracy and Surface Quality of Impression Materials and Gypsum Casts. J Clin Med Res. 2009 Jun;1(2):81-89.
14. Abdelaziz KM, Combe EC, Hodges JS. The ef-fect of disinfectants on the properties of dental gypsum, part 2: surface properties. J Prostho-dont. 2002 Dec;11(4):234-40.
15. Ahila SC, Subramaniam E. Comparative evaluation of dimensional stability and surface quality of gypsum casts retrieved from disin-fected addition silicone impressions at various time intervals: An in vitro study. J Dent Oral Hyg. 2012 Dec;4(4):34–43.
16. Kalantari MH, Malekzadeh A, Emami A. The Effect of Disinfection with Sodium Hypo-chlorite 0.5% on Dimensional Stability of Con-densation Silicone Impression Materials of Speedex and Irasil. J Dent (Shiraz). 2014 Sep;15(3):98-103.
17. Ivanovski S, Savage NW, Brockhurst PJ, Bird PS. Disinfection of dental stone casts: antimicrobial effects and physical property alterations. Dent Mater. 1995 Jan;11(1):19-23.
18. Badrian H, Davoudi A, Molazem M, Zare MH. The effect of spraying different disinfectants on condensational silicone impressions; an in vitro study. J Indian Prosthodont Soc. 2015 Jul-Sep; 15 (3):263-7.
19. Drennon DG, Johnson GH. The effect of immersion disinfection of elastomeric impres-sions on the surface detail reproduction of im-proved gypsum casts. J Prosthet Dent. 1990 Feb;63(2): 233-41.
20. Drennon DG, Johnson GH, Powell GL. The ac-curacy and efficacy of disinfection by spray atomization on elastomeric impressions. J Pros-thet Dent. 1989 Oct;62(4):468-75.
21. Merchant VA, Radcliffe RM, Herrera SP, Stroster TG. Dimensional stability of reversible hydrocolloid impressions immersed in selected disinfectant solutions. J Am Dent Assoc. 1989 Oct; 119(4):533-5.
22. Merchant VA. Infection control and prosthodontics. J Calif Dent Assoc. 1989 Feb; 17 (2):49-53.
23. Revised American Dental Association specification No.19 for non-aqueous, elasto-meric dental impression materials. J Am Dent Assoc. 1977 Apr;94(4):733-41.
24. International organization for standardization (2015) Dentistry--Elastomeric impression materials. ISO 4823:2015. https://www.iso.org/standard/60586.html.
25. Moslehifard E, Nasirpouri F, Gasemzadeh S. Effect of Disinfectants on the Hardness of Den-tal Stones. J Islamic Dent Assoc Iran (JIDAI). 2013 Summer; 25(2):127-33.
26. Anusavice K, Shen Ch, Rawls HR. Phillips' Sci-ence of Dental Materials. 12th ed. Elsivier, Saunders Co.2012:182-92.
27. Sakaguchi R, Power J. Craig's Restorative Den-tal Materials. 2012 .13th ed. Elsivier, Mosby company chapter 12:277-325.
28. Winkler MM, Monaghan P, Gilbert JL, Lauten-schlager EP. Comparison of four techniques for monitoring the setting kinetics of gypsum. J Prosthet Dent. 1998 May;79(5):532-6.
29. Abdullah MA. Surface detail, compressive strength, and dimensional accuracy of gypsum casts after repeated immersion in hypochlorite solution. J Prosthet Dent. 2006 Jun;95(6):462-8.
Send email to the article author

Add your comments about this article
Your username or Email:

CAPTCHA



XML     Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Koosha S, Pourhaghani S, Attar K. Hardness and Surface Detail Reproduction of Gypsum Casts Retrieved from Addition Silicone Impressions Disinfected for Different Time Points . J Iran Dent Assoc 2017; 29 (4) :149-157
URL: http://jida.ir/article-1-1933-en.html


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 29, Issue 4 (10-2017) Back to browse issues page
Journal of Iranian Dental Association

AWT IMAGE

This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly

Persian site map - English site map - Created in 0.05 seconds with 37 queries by YEKTAWEB 4645