Comparison of bond strength and surface morphology of dental enamel for acid and Nd-YAG laser etching

Diagaradjane Parmeswearan; Singaravelu Ganesan; P. Ratna; D. Koteeswaran

doi:10.1117/12.348332

19 May 1999 Comparison of bond strength and surface morphology of dental enamel for acid and Nd-YAG laser etching

Diagaradjane Parmeswearan, Singaravelu Ganesan, P. Ratna, D. Koteeswaran

Proceedings Volume 3593, Lasers in Dentistry V; (1999) https://doi.org/10.1117/12.348332
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Recently, laser pretreatment of dental enamel has emerged as a new technique in the field of orthodontics. However, the changes in the morphology of the enamel surface is very much dependent on the wavelength of laser, emission mode of the laser, energy density, exposure time and the nature of the substance absorbing the energy. Based on these, we made a comparative in vitro study on laser etching with acid etching with reference to their bond strength. Studies were conducted on 90 freshly extracted, non carious, human maxillary or mandibular anteriors and premolars. Out of 90, 60 were randomly selected for laser irradiation. The other 30 were used for conventional acid pretreatment. The group of 60 were subjected to Nd-YAG laser exposure (1060 nm, 10 Hz) at differetn fluences. The remaining 30 were acid pretreated with 30% orthophosphoric acid. Suitable Begg's brackets were selected and bound to the pretreated surface and the bond strength were tested using Instron testing machine. The bond strength achieved through acid pretreatment is found to be appreciably greater than the laser pretreated tooth. Though the bond strength achieved through the acid pretreated tooth is found to be significantly greater than the laser pretreated specimens, the laser pretreatement is found to be successful enough to produce a clinically acceptable bond strength of > 0.60 Kb/mm. Examination of the laser pre-treated tooth under SEM showed globule formation which may produce the mechanical interface required for the retention of the resin material.

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Diagaradjane Parmeswearan, Singaravelu Ganesan, P. Ratna, and D. Koteeswaran "Comparison of bond strength and surface morphology of dental enamel for acid and Nd-YAG laser etching", Proc. SPIE 3593, Lasers in Dentistry V, (19 May 1999); https://doi.org/10.1117/12.348332

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KEYWORDS

Teeth

Laser bonding

Etching

Laser dentistry

Nd:YAG lasers

Scanning electron microscopy

Photography

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