:: Volume 30, Issue 1 (1-2018) ::
J Iran Dent Assoc 2018, 30(1): 32-38 Back to browse issues page
Effect of Storage Conditions and Disinfection with 2% Deconex® on Dimensional Stability of Two Self-Cure Acrylic Resins
Shima Safaeian1, Sareh Habibzadeh * 2, Seyed Jalal Porhashemi3, Niloofar Entezari Moghaddam4
1- Assistant Professor, Department of Prosthodontics, School of Dentistry, International Campus, Tehran University of Medical Sci-ences, Tehran, Iran
2- Assistant Professor, Department of Prosthodontics, School of Dentistry, International Campus, Tehran University of Medical Sci-ences, Tehran, Iran , s-habibzadeh@tums.ac.ir
3- Professor, Department of Pediatrics Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
4- Dentist, Private Practice, Tehran, Iran
Abstract:   (2845 Views)
Background and Aim:
There is a gap of information on the effect of time, disinfectant, and storage conditions on the dimensional stability of direct post patterns made of self-cure acrylic resins. This study assessed the effect of Deconex® and wet or dry stor-age conditions on the dimensional stability of post patterns made of Duralay and GC acrylic resins.
Materials and Methods:
Sixty specimens were fabricated of GC and Duralay acrylic resins (n=30) by using a stainless steel mold. The specimens in each group were divided into three subgroups (n=10). The specimens of subgroup 1 were immersed in Deconex® for 2 minutes followed by dry storage at 25°C. The specimens of subgroup 2 were stored in water at 25°C. The samples of subgroup 3 were immersed in Deconex® for 2 minutes followed by water storage at 25°C. The dimensions were measured immediately and 2 minutes, 1 hour, and 24 hours after setting. Data were analyzed by repeated measures ANOVA. One-way ANOVA and t-test were used for subgroup analysis at 5% significance level.
The greatest mean dimensional changes occurred after 24 hours in both groups. In GC group, subgroup 1 experienced minimal changes during 24 hours. Duralay subgroups 1 and 2 experienced minimal changes after 1 and 24 hours; the difference between the two subgroups was not significant. Maximum changes were noted in GC subgroups 2 and 3 and in Duralay subgroup 3 (P<0.05).
In case of a 24-hour delay, storage conditions would have no effect on the dimensional stability of Duralay patterns, while GC patterns should be stored in a dry condition.
Keywords: Acrylic Resins, Dental Dowel, Post and Core Technique, Disinfection
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Type of Study: Orginal | Subject: Porosthodontics
1. Wong DM, Cheng LY, Chow TW, Clark RK. Effect of processing method on the dimensional accuracy and water sorption of acrylic resin dentures. J Prosthet Dent. 1999 Mar; 81(3):300-4.
2. Mojon P, Oberholzer JP, Meyer JM, Belser UC. Polymerization shrinkage of index and pattern acrylic resins. J Prosthet Dent. 1990 Dec; 64 (6):684-8.
3. Bartlett SO. Construction of detached core crowns for pulpless teeth in only two sittings. J Am Dent Assoc. 1968 Oct;77(4):843-5.
4. Dewhirst RB, Fisher DW, Schillingburg HT Jr. Dowel-core fabrication. J South Calif Dent As-soc. 1969 Oct;37(10):444-9.
5. Mondelli J, Piccino AC, Berbert A. An acrylic resin pattern for a cast dowel and core. J Pros-thet Dent. 1971 Apr;25(4):413-7.
6. Stern N. A direct pattern technique for posts and cores. J Prosthet Dent. 1972 Sep;28(3):279-83.
7. Hughes HJ. Two uses of acrylic copings in restorative dentistry. Aust Dent J. 1973 Apr; 18 (2):102-4.
8. Patterson JC Jr. A technique for accurate soldering. J Prosthet Dent. 1972 Nov;28(5):552-6.
9. Shillingburg HT, Brackett S, Whitsett L, Sumiya H,. Fundamentals of Fixed Prosthodontics, 3rd ed. Chicago, IL, USA: Quintessence Publishing Co., 1997:374.
10. Dixon DL, Breeding LC, Lindquist TJ. Linear dimensional variability and tensile strengths of three solder index materials. J Prosthet Dent. 1992 May;67(5):726-9.
11. Mahshid M, Varjavand Naseri N, Shoaei SH. The effects of time elapse, disinfection solu-tions and preservation places on dimensions of Duralay acrylic pattern. Beheshti Univ Dent J. 2005; 22(4): 690-703.
12. McDonnell T, Houston F, Byrne D, Gorman C, Claffey N. The effect of time lapse on the accu-racy of two acrylic resins used to assemble an implant framework for soldering. J Prosthet Dent. 2004 Jun;91(6):538-40.
13. Cahi E, Rosen M, Becker PJ. A comparison of the dimensional stability of three inlay pattern materials. J Dent Assoc S Afr. 1996 Jun;51(6):337-42.
14. Takahashi J, Kitahara K, Teraoka F, Kubo F. Resin pattern material with low polymerization shrinkage. Int J Prosthodont. 1999 Jul-Aug; 12(4): 325-9.
15. Iglesias A, Powers JM, Pierpont HP. Accuracy of wax, autopolymerized, and light-polymerized resin pattern materials. J Prosthodont. 1996 Sep; 5 (3):201-5.
16. Koumjian JH, Holmes JB. Marginal accuracy of provisional restorative materials. J Prosthet Dent. 1990 Jun;63(6):639-42.
17. Ghanbarzadeh J, Sabooni MR, Roshan-Nejad R. The Effect of Storage Conditions on Dimensional Changes of Acrylic Post-Core Patterns. J Dent (Tehran). 2007;4(1):27-31.
18. Mosharaf R, Ghasemzadeh S. Comparison of linear dimensional changes of Duralay acrylic resin in different storage media. JIDA. 2006 Spring; 18 (1):91-96.
19. Cho GC, Chee WW. Efficient soldering index materials for fixed partial dentures and implant substructures. J Prosthet Dent. 1995 May; 73(5): 424-7.
20. Pagniano RP, Scheid RC, Clowson RL, Dagefoerde RO, Zardiackas LD. Linear dimensional change of acrylic resins used in the fabrication of custom trays. J Prosthet Dent. 1982 Mar;47(3):279-83.

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