The Effect Of ND:YAG Laser On Enamel Surface And Composition For Removal Of Composite Adhesives

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Date
2018-10
Authors
Abd Razak, Nurul Atiqah
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Publisher
Universiti Sains Malaysia
Abstract
Nd:YAG laser (1064 nm) irradiation on enamel surface and removal of composite adhesives was studied. Field Emission Electron Microscopy (FESEM) and Energy Dispersive X-Ray (EDX) analysis were used to observe the changes in surface morphology and composition of elements on the tooth surface. Carbon, oxygen, phosphorus, and calcium were the elements identified in the samples. In this study, the effect of Nd:YAG laser parameter such as fluence, pulse width and energy were investigated. Forty healthy premolars were cut into half and subjected to Nd:YAG laser irradiation. The study was divided into two categories which were laser irradiation without adhesives and laser irradiation with adhesives. 45 samples were randomly classified into without adhesives application whereas 35 samples were applied with adhesives. The effects of using multiple settings of fluence, pulse width and energy were also discussed. Fluence and pulse width variation were used on samples without adhesive, while energy variation was tested on the samples with adhesives. 120 J/cm2 of fluence and 150-200 ms of pulse width were the best range of parameters where less damage was produced to the irradiated area of the enamel surface. After laser irradiation, the level of carbon composition increased in EDX, while the oxygen element decreased. For removal of composite adhesives, 540 mJ seems to be adequate for the removal and shows less indentations and a scattered graininess on the tooth surface. EDX results shown reduction in carbon percentage, but increased in oxygen percentage. This study concludes that the effect of Nd:YAG laser irradiation on enamel surface and dental material would be different depends on the parameters used during irradiation and adhesives conditioning on the tooth surface.
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Keywords
The effect of ND:YAG laser on enamel surface , for removal of composite adhesives
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