Abstract
Debonding of ceramic brackets due to their high bond strength and low fracture toughness is one of the clinician’s complications. The purpose of this study is to evaluate the effect of a laser on shear bond strength, site of debonding, and ARI index during debonding of ceramic brackets and then compare it to the conventional method used for this procedure. Thirty polycrystalline alumina (G & H Series, Germany) brackets were bonded to 30 intact extracted first and second maxillary premolars and stored in a 1% thymol solution. A chemically cured orthodontic composite resin (No-mix, Unitek, USA) was used for bonding the brackets to the enamel surface on all teeth. All brackets were positioned 4 mm from the incisal edge of the teeth with an orthodontic bracket-positioning device. Then the teeth with bonded brackets were embedded in auto-polymerized polymethylmethacrylate (2.2.3 cm) blocks using a special device to make their slots horizontally parallel. These 30 teeth were then divided into two subgroups: control or no-lased (n = 15) and super pulse CO2 laser (n = 15). To characterize the peak of SBS in two groups, we used an Instron machine while its blade was moving at a constant speed of 1 mm/min. For evaluating the site of debonding and the adhesive remnant index (ARI index), a light microscope and the Photoshop program were used. Means and standard deviations of the SBS in two subgroups shows that in the control group, the teeth have definitely higher values in comparison to the experimental group. The results of the two groups drew no substantial differences with respect to the surface of debonding, which was mostly within the adhesive. However, observing the results of ARI presented a significant distinction between the control and experimental group. This index denoted that the debonding site in the control group was closer to the enamel adhesive interface and, consequently, the rate of enamel damage in this group would be greater. The present study shows that a CO2 laser has the potential to replace the conventional method for debonding ceramic brackets due to less debonding force and more adhesive remnant index on the tooth surface.
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References
Flores DA, Caruso JM, Scott GE, Jeiroudi MT (1988) Fracture toughness and surface cracks. The key to understanding ceramic brackets. Angle Orthod 58:5–8
Kusy RP (1988) Morphology of polycrystalline alumina brackets and its relationship to fracture toughness and strength. Angle Orthod 58:197–203
Crooks M, Hood J, Harkness M (1997) Thermal debonding of ceramic brackets: an in vitro study. AJO 111(2):163–172
Brouns EM, Schopf PM, Kocjancic B (1993) Electrothermal debonding of ceramic brackets. Eur J Orthod 15(2):115–123
Jost–Brinkman PG, Stein H, Miethke RR Histologic investigation of the human pulp after thermodebonding of metal and ceramic brackets
Ma T, Marangoni RD, Flint W (1997) In vitro comparison of debonding force and intrapulpal temperature changes during ceramic orthodontic bracket removal using a carbon dioxide laser. Am J Orthod Dentofacial Orthop 111:203–210. doi:10.1016/S0889-5406(97)70217-8
Stroble K, Bahns TL, Willham L, Bishara SE, Stwalley WC (1992) Laser-aided debonding of orthodontic ceramic brackets. Am J Orthod Dentofacial Orthop 101:152–158. doi:10.1016/0889-5406(92)70007-W
Obata A (1995) Effectiveness of CO2 laser irradiation on ceramic brackets debonding. J Jpn Orthod Soc 54:285–295
Rickabaugh JL, Marangoni RD, Mccaffrey K (1996) Ceramic bracket debonding with the carbon dioxide laser. Am J Orthod Dentofacial Orthop 110:388–393. doi:10.1016/S0889-5406(96)70040-9
Sinha PK, Nanda RS (2001) Fixed edgewise orthodontic appliances and bonding techniques. Textbook of Orthodontics. Samir E Bishara: 1st Ed. W.B.Saunders Co; Chap 14:194
Mimura H, Deguchi T, Obata A, Yamagishi T, Ito M (1995) Comparison of different bonding materials for laser debonding. AJO 188(3):207–273
Smith SC, Walsh LJ, Taverne AA (1999) Removal of orthodontic bonding resin residues by CO2 laser radiation. J Clin Laser Med Sug 17(1):13–18
Obata A, Tsumura T, Niwa K, Ashizaway, Deguchit, Ito M (1999) Superpulse CO2 laser for bracket bonding and debonding. Eur J Orthod 21(2):193–198
Bishara SE, Fehr DE, Jakobsen JR (1993) A comparative study of the debonding strengths of different ceramic brackets enamel conditioners and adhesives. Am J Orthod Dentofacial Orthop 104:170–179. doi:10.1016/S0889-5406(05)81007-8
Tocchio RM, Williams PT, Mayer FJ (1993) Standing KG laser debonding of ceramic orthodontic bracket. AJO 103(2):155–162
Azzeh E, Feldon PJ (2003) Laser debonding of ceramic brackets. AJO Dentofac Orthop 123(1):79–83
Acknowledgements
This project was supported by the Dental Research Center of Shaheed Beheshti University of Medical Sciences. The authors wish to acknowledge technical assistance of the Material Lab of Tehran University and Mr. Farhadi for his editorial support.
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Tehranchi, A., Fekrazad, R., Zafar, M. et al. Evaluation of the effects of CO2 laser on debonding of orthodontics porcelain brackets vs. the conventional method. Lasers Med Sci 26, 563–567 (2011). https://doi.org/10.1007/s10103-010-0820-y
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DOI: https://doi.org/10.1007/s10103-010-0820-y