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:: Volume 31, Issue 2 (Spring 2013) ::
J Dent Sch GYEAR__, 31(2): 73-77 Back to browse issues page
Effect of different treatment on Surface Morphology of laser bleached teeth: SEM Evaluation
Mahshid Mohammadi Basir Dr., Mohammad Bagher Rezvani Dr., Nasim Chiniforoush , Zohreh Moradi Corresponding Author: Dr. *
Postgraduate Student Dept. of Operative Dentistry , zo.moradi@shahed.ac.ir
Abstract:   (4103 Views)

Objective: The aim of this study was to evaluate and compare the effect of dental surface treatment with Er:YAG , Nd:YAG ,CO2 lasers and sodium ascorbate to recently laser bleached enamel by scanning electron microscope (SEM).

Methods: 15caries-free extracted human third molars were selected for this study. The samples were bleached by Heydent JW power activated by diode laser 810 nm. After 7 day, the bleaching procedure was repeated as same as first time. Then, the samples were divided to five groups randomly as follow: Group 1: treated using Nd:YAG laser with output power of 1 W, Group 2: treated using Er:YAG laser with output power of 0.5 W, Group 3: treated using CO2 laser with output power of 0.5 W, Group 4: sodium ascorbate 10%, Group 5: no surface treatment. After treatments, the surfaces were evaluated using Scanning Electron Microscope (SEM) analysis.

Results: The surfaces treated by Nd:YAG laser showed some melting area but the surface treated by Er:YAG laser showed irregular and micro porous surface. CO2 laser treatment of surfaces resulted in melting of superficial layer of dental substrate and micro cracks. Sodium ascorbate did not change the surface except changes raised from bleaching.

Conclusion: Laser conditioning of laser-bleached teeth can be beneficial for enhancing bond strength of resin material to recently bleached enamel.

Keywords: Er:YAG laser, Nd:YAG laser, CO2 laser, Sodium ascorbate, Scanning Electron Microscope.
Full-Text [PDF 641 kb]   (1192 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2013/07/21 | Accepted: 2013/10/12 | Published: 2013/10/12
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Mohammadi Basir M, Rezvani M B, Chiniforoush N, Moradi Z. Effect of different treatment on Surface Morphology of laser bleached teeth: SEM Evaluation. J Dent Sch. 2013; 31 (2) :73-77
URL: http://jds.sbmu.ac.ir/article-1-1130-en.html

Volume 31, Issue 2 (Spring 2013) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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