The Assessment of Time and Storage Environment Effects on Dimensional Changes of Two Types of Acrylic Resin Post Patterns GC and Reliance
Document Type : مقالههای پژوهشی
Authors
1 Postgraduate Student, Department of Orthodontics, Dental Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
2 Dentist, Zahedan, Iran
3 Assistant Professor, Department of Prosthodontics, School of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
10.48305/v0i0.1671
Abstract
Introduction: The purpose of this study was to investigate and compare the dimensional changes in the acrylic patterns that were stored in the different times and conditions of storage.
Materials and Methods: In this experimental study The sample number was 28 in 4 groups. The mixed paste of acrylic samples were placed inside a metal mold and after setting time with the slightest of deformations it was removed. Using this method 28 samples were prepared for each material. The diameters of samples were then measured immediately using a digital caliper with a precision of 0.01 mm. The samples were then divided into four quadruple groups and stored at 22° C room temperature, 22° Cat water, Dry 4° C environment and 4° C water. The dimensions of the four groups were measured at intervals of 1, 8, 24, and 48 hours after polymerization and being removed from the metal molds. The MANOVA test was used for data analysis (p value = 0.05).
Results: The findings of the current study showed that the dimensional changes of Duralay and GC acrylic resins at both 4 and 22° C in dry and water environments are decreasing over time (p value < 0.001). This study indicated that the contraction rate of two types of acrylic resins, Duralay and GC, at two temperatures of 4 and 22° C, and dry and humid conditions and at various times were not different.
Conclusions: Dimensional changes in of the two types of acrylic resin, Duralay and GC, During the lapse, the procedure is going to be decreased but have not seen any statistical difference between these type of acrylic resin in environment storage.
Keywords: Dental restoration, Acrylic resins, Post and core technique.
Materials and Methods: In this experimental study The sample number was 28 in 4 groups. The mixed paste of acrylic samples were placed inside a metal mold and after setting time with the slightest of deformations it was removed. Using this method 28 samples were prepared for each material. The diameters of samples were then measured immediately using a digital caliper with a precision of 0.01 mm. The samples were then divided into four quadruple groups and stored at 22° C room temperature, 22° Cat water, Dry 4° C environment and 4° C water. The dimensions of the four groups were measured at intervals of 1, 8, 24, and 48 hours after polymerization and being removed from the metal molds. The MANOVA test was used for data analysis (p value = 0.05).
Results: The findings of the current study showed that the dimensional changes of Duralay and GC acrylic resins at both 4 and 22° C in dry and water environments are decreasing over time (p value < 0.001). This study indicated that the contraction rate of two types of acrylic resins, Duralay and GC, at two temperatures of 4 and 22° C, and dry and humid conditions and at various times were not different.
Conclusions: Dimensional changes in of the two types of acrylic resin, Duralay and GC, During the lapse, the procedure is going to be decreased but have not seen any statistical difference between these type of acrylic resin in environment storage.
Keywords: Dental restoration, Acrylic resins, Post and core technique.
1 Anusavice K, Shen C, Rawls HP. Phillips science of dental materials. Philadelphia, PA: W.B. Saunders; 1996. p. 6, 7, 27-33, 211-13, 154.
2 Ghanbarzadeh J, Sabooni MR, Roshan-Nejad R. The effect of storage conditions on dimensional changes of acrylic post-core patterns. Front Dent 2007; 4(1): 27-31.
3 Taiefe Davaloo A, Bakianian Vaziri P, Kasraei SH, Sadeghimehr M, Abedi M. The influence of humidity on expansion and shrinkage properties of duralay. J Res Dental Sci 2010; 4: 5-10.
4 Taha NA, Palamara JE, Messer HH. Fracture strength and fracture patterns of root filled teeth restored with direct resin restorations. J Dent 2011; 39(8): 527-35.
5 Sabbak SA. Simplified technique for refabrication of cast posts and cores. J Prosthet Dent 2000; 83(6): 686-7.
6 Reis L, Zanetti AL, Castro Junior OV, Martinez EF. Use of 0.25% and 0.025% peracetic acid as disinfectant agent for chemically activated acrylic resin: an in vitro study. Ver Gaúcha Odontol. 2012; 60(3): 315-20.
7 Sabouhi M, Nosouhian S, Dakhilalian M, Davoudi A, Mehrad R. The effect of time and storage environment on dimensional changes of acrylic resin post patterns. Open Dent J 2015; 9: 87-90.
8 Mojon P, Oberholzer JP, Meyer JM, Belser UC. Polymerization shrinkage of index and pattern acrylic resins. J Prosth Dent 1990; 64(6): 684-8.
9 Goldfogel M, Harvey WL, Winter D. Dimensional change of acrylic resin tray materials. J Prosth Dent 1985; 54(2): 284-6.
10 Shillingburg HT, Sather DA, Wilson EL Jr, Cain JR, Mitchel DL, Blanco LJ, et al. Fundamentals of Fixed Prosthodontics. New York, NY: Quintessence Pub Co; 1997. p. 997.
11 Mahshid M, Varjavand Naseri N, Shoeybi SH. The effects of time elapse, desinfection solutions and preservation places on dimensions of Duralay acrylic pattern. J Dent Sch Shahid Beheshti Univ Med Sci 2005: 690-703. [In Persian].
12 Mosharraf R, Ghasemzadeh S. Comparison of linear dimensional changes of Duralay acrylic resin in different storage media. Majallah-I-Dandanpizishki 2006; 18(1): 91-6. [In Persian].
13 McDonnell T, Houston F, Byrne D, Gorman C, Claffey N. The effect of time lapse on the accuracy of two acrylic resins used to assemble an implant framework for soldering. J Prosth Dent 2004; 91(6): 538-40.
14 Iglesias A, Powers JM, Pierpont HP. Accuracy of wax, autopolymerized, and light-polymerized resin pattern materials. J Prosth 1996; 5(3): 201-5.
15 Sabooni M, Nosouhian S, Dakhilalian M, Davoudi A, Mehrad R. The effect of storage conditions on the effect of time and storage environment on dimensional changes of acrylic resin post patterns. Open Dent J 2015; 9: 87-90.
16 Pagniano RP, Scheid RC, Clowson RL, Dagefoerde RO, Zardiackas LD. Linear dimensional change of acrylic resins used in the fabrication of custom trays. J Prosth Dent 1982; 47(3): 279-83.
17 Dixon DL, Breeding LC, Lindquist TJ. Linear dimensional variability and tensile strengths of three solder index materials. J Prosth Dent 1992; 67(5): 726-9.
18 Mousavi SM, Ghorani PS, Javidi P, Berahman N, Moattari M. The effect of time and three different storage environments on the dimensional stability of acrylic removable orthodontic appliances. Biosci Biotechnol Res Asia 2015; 12(3): 2319-24.
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