In vitro effect of Q-switched Nd:YAG laser exposure on morphology, hydroxyapatite composition and microhardness properties of human dentin

Apsari, Retna; Siswanto,; Yuliati, Anita; Bidin, Noriah

doi:10.20473/j.djmkg.v44.i4.p181-186

Cited by 1 publication

(2 citation statements)

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“…Annealing of the dentine surface occurs with this increase in energy, and the surface becomes harder due to the loss of water content and carbon. The evaporation of water and carbon are responsible for increasing the microhardness of dentine [18,37]. This increase in hardness with increasing energy is also due to the melting and resolidification of dental hard tissues [16].…”

Section: Hardness Analysismentioning

confidence: 99%

“…In figure 2, SEM images for the IR laser depicts the ablation of collagen and pores at low energy. With the increase in laser energy, however, photothermal ablation is dominant and causes the evaporation of water and carbon content, resulting also in an increase in microhardness [37]. At the highest energy of 100 mJ, the evaporation of water and carbon content in the dentine causes an increase in internal pressure and destruction of inorganic components before the melting point of teeth tissue, leading in turn to the ejection of microfragments [16].…”

Section: Hardness Analysismentioning

confidence: 99%

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The variation in surface morphology and hardness of human deciduous teeth samples after laser irradiation

Khalid¹,

Bashir²,

Akram³

et al. 2017

Laser Phys.

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The variation in surface morphology and hardness of human deciduous teeth samples has been investigated after laser irradiation at different wavelengths and energies. Nd:YAG was employed as a source of irradiation for IR (1064 nm) and visible (532 nm) radiation, whereas an excimer laser was used as the source of UV (248 nm) radiation. Scanning electron microscope (SEM) analysis was carried out to reveal the surface morphological evolution of teeth samples. Vickers microhardness tester was employed to investigate the modifications in the hardness of the laser-treated samples. It is observed from SEM analysis that IR wavelength is responsible for ablation of collagen matrix and intertubular dentine. For visible radiation, the ablation of collagen along with hydroxypatite is observed. With UV radiation, the ablation of peritubular dentine is dominant and is responsible for the sealing of tubules. The decrease in hardness at lower energy for both wavelengths is due to the evaporation of carbon content. With increasing energy, evaporation of water along with carbon content, and resolidification and re-organization of inorganic content causes the increase in hardness of the treated dentine. SEM as well as microhardness analyses reveal that laser wavelengths and energy of laser radiation significantly influence the surface morphology and hardness of samples.

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Section: Hardness Analysismentioning

confidence: 99%

Section: Hardness Analysismentioning

confidence: 99%