Journal of Clinical and Diagnostic Research, ISSN - 0973 - 709X

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Original article / research
Year : 2017 | Month : September | Volume : 11 | Issue : 9 | Page : ZC59 - ZC63

SEM Evaluation of Enamel Surface Changes and Enamel Microhardness around Orthodontic Brackets after Application of CO2 Laser, Er,Cr:YSGG Laser and Fluoride Varnish: An In vivo Study

Tarundeep Kaur, Tulika Tripathi, Priyank Rai, Anup Kanase

1. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad Institute of Dental Sciences, New Delhi, India. 2. Senior Professor and Head, Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad Institute of Dental Sciences, New Delhi, India. 3. Professor, Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad Institute of Dental Sciences, New Delhi, India. 4. Professor, Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad InstItute of Dental Sciences, New Delhi, India.

Correspondence Address :
Dr. Tulika Tripathi,
Senior Professor and Head, Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad Institute of Dental Sciences,
MAMC complex, Bahardur Shah Zafar Road, New Delhi- 110002, India.
E-mail: drtulikatripathi@yahoo.com

Abstract

Introduction: One of the most undesirable consequences of orthodontic treatment is occurrence of enamel demineralization around orthodontic brackets. Numerous in vitro studies have reported the prevention of enamel demineralization by surface treatment with lasers and fluoride varnish.

Aim: To evaluate the changes on the enamel surface and microhardness around orthodontic brackets after surface treatment by CO2 laser, Er,Cr:YSGG laser and fluoride varnish in vivo.

Materials and Methods: A double blind interventional study was carried out on 100 premolars which were equally divided into five groups, out of which one was the control group (Group 0). The intervention groups (Group I to IV) comprised of patients requiring fixed orthodontic treatment with all 4 first premolars extraction. Brackets were bonded on all 80 premolars which were to be extracted. Enamel surface treatment of Groups I, II and III was done by CO2 laser, Er,Cr:YSGG laser and 5% sodium fluoride varnish respectively and Group IV did not receive any surface treatment. A modified T-loop was ligated to the bracket and after two months, the premolars were extracted. Surface changes were evaluated by Scanning Electron Microscopic (SEM) and microhardness testing. Comparison of mean microhardness between all the groups was assessed using post-hoc test with Bonferroni correction.

Results: Group I showed a melted enamel appearance with fine cracks and fissures while Group II showed a glossy, homogenous enamel surface with well coalesced enamel rods. Group III showed slight areas of erosions and Group IV presented areas of stripped enamel. Significant difference was observed between the mean microhardness (VHN) of Group I, Group II, Group III, Group IV and Group 0 with p<0.001. A significant difference of p<0.001 was observed while comparing Group I vs II,III,IV,0 and Group II vs III,IV,0. However, difference while comparing Group III vs IV was p=0.005 and difference between the mean microhardness of Group 0 vs Group III was non significant.

Conclusion: Surface treatment with Er,Cr:YSGG laser causes a positive alteration of the enamel surface increasing its ability to resist demineralization with optimum microhardness as compared to CO2 laser and sodium fluoride varnish.

Keywords

Dental enamel, Sodium fluoride, Surface treatment

How to cite this article :

Tarundeep Kaur, Tulika Tripathi, Priyank Rai, Anup Kanase. SEM EVALUATION OF ENAMEL SURFACE CHANGES AND ENAMEL MICROHARDNESS AROUND ORTHODONTIC BRACKETS AFTER APPLICATION OF CO2 LASER, ER,CR:YSGG LASER AND FLUORIDE VARNISH: AN IN VIVO STUDY. Journal of Clinical and Diagnostic Research [serial online] 2017 September [cited: 2018 Jan 22 ]; 11:ZC59-ZC63. Available from
http://www.jcdr.net/back_issues.asp?issn=0973-709x&year=2017&month=September&volume=11&issue=9&page=ZC59-ZC63&id=10603

DOI and Others

DOI: 10.7860/JCDR/2017/30292.10603

Date of Submission: May 22, 2017
Date of Peer Review: Jun 03, 2017
Date of Acceptance: Aug 24, 2017
Date of Publishing: Sep 01, 2017

Financial OR OTHER COMPETING INTERESTS: None.

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