In Vitro Evaluation of the Effect of Thermocycling on the Shear Bond Strength of Light-Cured Composite and Resin Modified Glass Ionomer Cement Using Different Orthodontic Brackets
Abstract
Background: This study was conducted to investigate and compare the effects of thermocycling on the shear bond strength of two light cured orthodontic bonding materials, namely composite and resin-modified glass ionomer cement that used to bond stain- less steel and Sapphire brackets on human teeth, and to determine the type of bonding failure of these materials.
Materials and Methods: Eighty extracted human premolars were selected and randomly divided into two equal groups each with 40 teeth according to the brackets types. Both groups were subdivided into four groups (n = 10) two of these subgroups bonded with composite one control and the second thermocycled and the other two subgroups bonded with resin-modified glass ionomer cement also one control and the second thermocycled. The sample were stored in water at 37o C for 24 hours, then the control groups were tested while the study groups were thermocycled between 5 o C and 55 o C for 500 cycles. The samples were tested for shear bond strength using an Instron universal testing machine. For adhesive remnant index, the enamel surface and bracket base of each tooth were inspected under magnifying lens (20X) of a stereomicroscope.
Results and Conclusions: The shear bond strength of light-cured composite is higher significantly than resin-modified glass iono- mer cement. Thermocycling decreases the shear bond strength of the sapphire brackets bonded with composite significantly by 60.16%. The most predominant sites of bond failure are within the adhesive itself and between the adhesive and the enamel.
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Antonucci JM, McKinney JE, Stansbury JW. Resin-modified glass ionomer cement. US patent application.7–160856,1988.
Hegarty DJ, Macfarlane TV. In vivo bracket retention compari-
son of a resin-modified glass ionomer cement and a resin-based bracket adhesive system after a year. Am J Orthod Dentofac Or- thop. 2002;121(5):496-501.
Albers HF. Tooth-colored restoratives: principles and techniques. 9th ed. BC Decker Inc Hamilton; London: 2002.
Croll TP, Nicholson JW. Glass ionomer cements in pediatric Den- tistry: review of the literature. Pediatr Dent. 2002;24(5):423-9.
Nagaraja Upadhya P, Kishore G. Glass Ionomer Cement – the different generations. Trends Biomater Artif Oragans J. 2005;18(2):158-65.
Brantley WA, Eliades T. Orthodontic materials scientific and clinical aspects. 1st ed. Stuttgart. New York: Thieme; 2001.
Arici S, Arici N. Effects of thermocycling on the bond strength of a resin-modified glass ionomer cement: An in vitro compara- tive study. Angle Orthod. 2003;73(6):692–6. (IVSL).
Al-Ibrahim ASO. Assessment of shear bond strength of a new resin modified glass ionomer cement using different types of brackets an in vitro study. A master thesis, Department of POP, College of Dentistry, University of Mosul, 1999.
Thanoon M. Evaluation of bond strength of orthodontic bracket cemented by light cured resin-modified glass ionomer adhesive to contaminated enamel at 24 hours and 30 days. A master the- sis, Department of POP, College of Dentistry, University of Mo- sul, 2007.
Hamed MM, Tawfek ZS, Younis MT. Shear bond strength of Resin Modified Glass Ionomer Cement using different enamel conditions. Al–Rafidain Dent J. 2010;10(1):127–32.
Al-Khateeb HM. Shear bond strength of different lingual but- tons bonded to wet and dry enamel surfaces with resin modi- fied glass ionomer cement (In vitro comparative study). A master thesis, Department of Orthodontics, College of Den- tistry, University of Baghdad, 2012.
Gasgoos SS, Sa’id RJ. The Effect of thermocycling on shear bond strength of two types of self- etch primers. Al–Rafid-
14.
16.
19. 20.
22.
ain Dent J. 2009;9(2):246-53.
Bishara SE, Ostby AW, Laffoon J, Warren JJ. A self-condi- tioner for resin-modified glass ionomers in bonding ortho- dontic brackets. Angle Orthod. 2007;77(4):711-5. (IVSL). Rajagopal R, Padmanabhan S, Gnanamani J. A comparison of shear bond strength and debonding characteristics of con- ventional, moisture-insensitive, and self-etching primers in vitro. Angle Orthod. 2004;74(2):264-8. (IVSL)
Cozza P, Martucci L, De Toffol L, Penco SI. Shear bond strength of metal brackets on enamel. Angle Orthod. 2006;76(5):851-6. (IVSL).
Bishara SE, Oonsombat C, Soliman MMA, Warren J. Ef- fects of using a new protective sealant on the bond strength of orthodontic brackets. Angle Orthod. 2005; 75(2):243-6. (IVSL).
Bishara SE, VonWald L, Laffoon JF, Warren JJ. The effect of repeated bonding on the shear bond strength of a composite resin orthodontic adhesive. Angle Orthod. 2000;70(6):435- 43. (IVSL).
Amra I, Samsodien G, Shaikh A, Lalloo R. Xeno III self- etching adhesive in orthodontic bonding: the next generation. Am J Orthod Dentofac Orthop. 2007;131(2):160.e11-15. Sokucu O, Siso SH, Ozturk F, Nalcaci R. Shear bond strength of orthodontic brackets cured with different light sources un- der thermocycling. Eur J Dent .2010;4(3):257-62.
Wang WN, Meng CL, Tarng TH. Bond strength: a com- parison between chemical coated and mechanical interlock bases of ceramic and metal brackets. Am J Orthod Dentofac Orthop. 1997;111(4):374-81.
Garma NMH. The effect of light intensity and curing time of light emitting diode on shear bond strength using dif- ferent types of bracket’s materials. J Bagh Coll Dentistry. 2012;24(4):132-8.
Toledano M, Osorio R, Osorio E, Romeo A, Higuera B, García-Godoy F. Bond strength of orthodontic brackets us- ing different light and self-curing cements. Angle Orthod. 2003;73(1):56-63. (IVSL).
DOI: http://dx.doi.org/10.26477/idj.v35i1.154
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