Effect of Erbium-Doped Yttrium Aluminium Garnet Laser Parameters on Ablation Capacity and Morphology of Primary Dentin
| Autor: | Maria Cristina Borsatto, Jesus Djalma Pécora, Andrea Soares de Oliveira Ortolan, Jaciara Miranda Gomes-Silva, Regina Guenka Palma-Dibb, Maria Angélica Hueb de Menezes-Oliveira, Carolina Paes Torres |
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| Rok vydání: | 2009 |
| Předmět: |
Molar
Materials science Surface Properties Scanning electron microscope medicine.medical_treatment Biomedical Engineering Analytical chemistry chemistry.chemical_element Lasers Solid-State law.invention Erbium Random Allocation chemistry.chemical_compound Yttrium aluminium garnet law medicine Dentin Humans Radiology Nuclear Medicine and imaging Irradiation Analysis of Variance Ablation Laser medicine.anatomical_structure chemistry Tooth Extraction Microscopy Electron Scanning |
| Zdroj: | Photomedicine and Laser Surgery. 27:885-890 |
| ISSN: | 1557-8550 1549-5418 |
| DOI: | 10.1089/pho.2008.2358 |
| Popis: | To evaluate the ablation capacity of different energies and pulse repetition rates of an erbium-doped yttrium aluminium garnet (Er:YAG) laser on primary dentin by assessing mass loss and to analyze the surface morphology using scanning electron microscopy (SEM).Previous studies have demonstrated the ability of the Er:YAG laser to ablate dentin substrate.Forty-eight sound primary molars were bisected in the mesiodistal direction. The dentin surfaces were flattened, and initial mass (mg) was obtained. A 4-mm2 area was delimited. Specimens were randomly assigned to 12 groups according to the combination of energy (160, 200, 250, and 300 mJ) and pulse repetition rate (2, 3, and 4 Hz). Er:YAG laser irradiation was performed for 20 s. After irradiation, the final mass was obtained, and specimens were prepared for SEM. The data obtained by subtracting the final mass from the initial mass were statistically analyzed using analysis of variance and Tukey test (alpha=0.05).The pulse repetition rate of 4 Hz provided greater mass loss, and it was different from 2 Hz and 3 HZ. The energy of 300 mJ resulted in greater mass loss, similar to 200 and 160 mJ. SEM micrographs showed dentinal tubule obliteration, structural alterations, and the presence of cracked areas in all specimens.The settings of 160, 200, and 250 mJ at 2 and 3 Hz promoted a good ablation rate with fewer surface alterations in primary dentin. |
| Databáze: | OpenAIRE |
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