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:: Volume 24, Issue 4 (12-2012) ::
2012, 24(4): 330-335 Back to browse issues page
Effect of curing times of bonding agents on microleakage in enamel and dentin margins using two curing systems
Mansoreh Mirzaei, Reza Nejatbakhsh, Esmaeil Yassini, Hamid Kermanshah, Ladan Ranjbar Omrani *
, ladanomrani@yahoo.com
Abstract:   (7994 Views)

  Effect of curing times of bonding agents on microleakage in enamel and dentin margins using two curing systems

 

  Dr. Mirzaei M .,1 Dr. Nejatbakhsh R .,2 Dr. Yassini E.,3 Dr. Kermanshah H.,1 Dr. Ranjbar Omrani L. 1

  1 Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Science . Tehran , Iran . 2 Orthodontics Postgraduate Student, School of Dentistry, Shahed University . Tehran , Iran . 3 Professor, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Science . Tehran , Iran .

  

 

  (Received 26 July, 2011 Accepted 17 July, 2012)

  

  Abstract

  

  Background and Aim : Lack of appropriate seal is one of the major problems in composite restorations. Properties of the bonding system can play a crucial role in sealing ability of these restorations. The aim of this study was to evaluate the microleakage of composite restorations with varying irradiation time for curing dentin bonding agents with two different curing devices in class V cavities .

  Materials and Methods : In this experimental study, 60 intact extracted human molars and premolars were subjected to standard class V cavity preparations. Cavities were divided to six groups. Following etching, Excite bonding agent was applied and light cured using QTH and LED systems for 20, 30 and 40 seconds and cavities were filled with composite. The filled cavities were subjected to 3000 thermal cycles with 5-55 ° C temperatures. Teeth were immersed into 0.5% basic fushin dye and sectioned occlusogingivally from the restoration middle area and the microleakage was determined using stereomicroscope by a 5-scaled rankings. Data were analyzed by Mann-Whitney and Kruskal-Wallis tests with p<.0.05 as the level of significance .

  Results : No leakage was found in enamel margins. The type of light curing device did not have any significant effect on dentin margins microleakage (p>0.05). Furthermore, no significant reduction in microleakage scores were observed in the restorations irradiated with different curing times (p>0.05 ). 

  Conclusion : QTH and LED curing units in 20, 30, and 40 s curing time did not have any significant effect on microleakage of class V composite restoration margins .

  Key words : Microleakage - Light curing - Bonding - Polymerization .

  

  Corresponding Author: Dr. Ranjbar Omrani L ., Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Science . Tehran , Iran .

  e.mail: ladanomrani@yahoo.com

Keywords: Microleakage, Light curing, Bonding, Polymerization
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Type of Study: Research | Subject: Restorative Dentistry
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Mirzaei M, Nejatbakhsh R, Yassini E, Kermanshah H, Ranjbar Omrani L. Effect of curing times of bonding agents on microleakage in enamel and dentin margins using two curing systems. The Journal of Islamic Dental Association of IRAN (JIDA) . 2012; 24 (4) :330-335
URL: http://jida.ir/article-1-1324-en.html


Volume 24, Issue 4 (12-2012) Back to browse issues page
مجله دندانپزشکی جامعه اسلامی دندانپزشکان Journal of Islamic Dental Association of Iran

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