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Year : 2013  |  Volume : 7  |  Issue : 1  |  Page : 2-8

Effects of conventional and laser activated intracoronal bleaching agents on ultrastructure and mineral content of dentin

Department of Conservative Dentistry and Endodontics, M A Rangoonwala College of Dental Sciences and Research Centre, Pune, India

Correspondence Address:
Robin J Jain
Department of Conservative Dentistry and Endodontics, MA Rangoonwala college of Dental sciences and Research Centre, Azam Campus, Camp, Pune
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0976-2868.118413

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Aims and Objectives: The purpose of this in vitro study was to evaluate the ultra structural changes induced in dentin after exposure to different conventiona and laser-activated intracoronal bleaching agents . Materials and Methods: Forty human maxillary teeth were taken and were decoronated through the cemento-enamel junction (CEJ) perpendicular to the long axis of tooth, the crown part was then cut parallel to long axis dividing the tooth into mesial and distal half. Experimental specimen were then divided into two groups (n = 20) in which group 1-35% hydrogen peroxide (Pola office SDI limited Australia) Group 2-30% hydrogen peroxide (J White Heydent GmbH Germany), the groups were further sub-divided into sub-group A - conventional application and Subgroup B - laser activation (Nd: Yag laser Fotona Fidellis III). The specimens were then evaluated under scanning electron microscope (FEI quanta 200 North America) to determine diameter of dentinal tubules and chemical analysis of the same was done. Results : Within the limits of this in vitro study, higher concentration of hydrogen peroxide used as intracoronal bleaching agent: (1) increases dentinal tubule diameter. (2) And also promote alteration in organic and inorganic components of dentin with reduction in calcium/phosphorous ratio leading to demineralization with insignificant difference between conventional application and laser activation. Conclusion : Laser activation of hydrogen peroxide bleaching agent can be added to the present treatment modalities for intracoronal bleaching techniques for faster and more accurate results.

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