UNIVERSITAS AIRLANGGA



Detail Article

Dental Journal (Majalah Kedokteran Gigi)

ISSN 1978-3728

Vol. 44 / No. 4 / Published : 2011-12

Order : 4, and page :181 - 186

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Original Article :

In vitro effect of q-switched nd:yag laser exposure on morphology, hydroxyapatite composition and microhardness properties of human dentin

Author :

  1. Retna Apsari *1
  2. Siswanto*2
  3. Anita Yuliati *3
  4. Noriah Bidin*4
  1. Department of Physics, Faculty of Sciences and Technology, Airlangga University, Surabaya - Indonesia
  2. Department of Physics, Faculty of Science and Technology, Airlangga University Airlangga University Surabaya - Indonesia
  3. Department of Dental Material, Faculty of Dentistry, Airlangga University, Surabaya - Indonesia
  4. Department of Physics, Faculty of Sciences, Universiti Teknologi Malaysia

Abstract :

Background: A Q-switched Nd:YAG laser was employed as a source of ablation. The fundamental wavelength of the laser is 1064 nm, with pulse duration of 8 nanosecond operates with uniphase mode of TEM00. In the following experiments, dentin samples (without caries and plaque) are exposed to pulse laser with Q-switching effect at various energy dose. Purpose: The aim of this study was to investigate the effect of laser ablation on dentin samples using Q-switched Nd:YAG laser exposure. Methods: The laser was operated in repetitive mode with frequency of 10 Hz. The energy dose of the laser was ranging from 13.9 J/cm2, 21.2 J/cm2 and 41.7 J/cm2. The target material comprised of human dentin. The laser was exposed in one mode with Q-switched Nd:YAG laser. Energy delivered to the target through free beam technique. The exposed human dentin was examined by using x-ray diffraction (XRD) and fluoresence scanning electron microscopy for energy dispersive (FESEM-EDAX). Microhardness of human dentin were examined by using microhardness vickers test (MVT). Results: The result obtained showed that the composition of hydroxyapatite of the dentin after exposed by Q-switched Nd:YAG laser are 75.02% to 78.21%, with microhardness of 38.7 kgf/mm2 to 86.6 kgf/mm2. This indicated that exposed pulsed Nd:YAG laser on the human dentin attributed to the phototermal effect. The power density created by the Q-switched Nd:YAG laser enables the heat to produce optical breakdown (melting and hole) associated with plasma formation and shock wave propagation, from energy dose of 21.2 J/cm2. From XRD analysis showed that the exposure of Nd:YAG laser did not involve in changing the crystal structure of the dentin, but due to photoablation effect. Conclusion: In conclusion, the application of Q-switched Nd:YAG laser as contactless drills in dentistry should be regarded as an alternative to the classical mechanical technique to improve the quality of the dentin treatment.

Keyword :

Plasma, laser ablation, crystal structure, microhardness, hydroxyapatite, Nd:YAG laser,


References :

Armstrong BL,(2010) Halitosis: A review of current literature - : Int J Dent Hygiene





Archive Article

Cover Media Content

Volume : 44 / No. : 4 / Pub. : 2011-12
  1. Betel Leaf Toothpastes Inhibit Dental Plaque Formation On Fixed Orthodontic Patients
  2. In Vivo Characterization Of Polymer Based Dental Cements
  3. Oral Rinse As A Potential Method To Culture Candida Isolate From Aids Patients
  4. In Vitro Effect Of Q-switched Nd:yag Laser Exposure On Morphology, Hydroxyapatite Composition And Microhardness Properties Of Human Dentin
  5. The Effectiveness Of Mimba Oil (azadirachta Indica A. Juss) Spray Disinfectant On Alginate Impression
  6. The Effect Of Spirulina Gel On Fibroblast Cell Number After Wound Healing Process
  7. The Difference Of Residual Monomer Levels Of Acrylic Resin With Various Polymerization Method
  8. Stimulation Of Osteoblast Activity By Induction Of Aloe Vera And Graft Combination
  9. Plaque Index Between Blind And Deaf Children After Dental Health Education
  10. The Difference Of Dental Anxiety Degree In Children Based On The Frequency Of Dental Appointment
  11. Volatile Sulphur Compounds Elimination: A New Insight In Periodontal Treatment
  12. Piperin And Piplartin As Natural Oral Anticancer Drug

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