Scanning electron microscope comparative surface evaluation of glazed-lithium disilicate ceramics under different irradiation settings of Nd:YAG and Er:YAG lasers
| Autor: | Ketij Mehulić, Lana Bergman, Sladana Milardovic Ortolan, Joško Viskić, Senka Meštrović, Drazen Jokic, Suzana Jakovljević |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
orthodontic bonding
lithium disilicate Er:YAG Nd:YAG dental lasers hydro-fluoric acid Ceramics Materials science Scanning electron microscope Surface Properties Mineralogy Orthodontics Surface finish Lasers Solid-State Hydrofluoric Acid law.invention 030207 dermatology & venereal diseases 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Hydrofluoric acid Acid Etching Dental law Materials Testing Lithium disilicate Ceramic Irradiation Composite material Dental Bonding 030206 dentistry Original Articles Laser Dental Porcelain Ceramic glaze chemistry visual_art visual_art.visual_art_medium Microscopy Electron Scanning |
| Zdroj: | Angle Orthod |
| Popis: | Objective: To evaluate the surface of glazed lithium disilicate dental ceramics after irradiation under different irradiation settings of Nd:YAG and Er:YAG lasers using a scanning electron microscope (SEM). Materials and Methods: Three glazed-press lithium disilicate ceramic discs were treated with HF, Er:YAG, and Nd:YAG, respectively. The laser-setting variables tested were laser mode, repetition rate (Hz), power (W), time of exposure (seconds), and laser energy (mJ). Sixteen different variable settings were tested for each laser type, and all the samples were analyzed by SEM at 500× and 1000× magnification. Results: Surface analysis of the HF-treated sample showed a typical surface texture with a homogenously rough pattern and exposed ceramic crystals. Er:YAG showed no effect on the surface under any irradiation setting. The surface of Nd:YAG-irradiated samples showed cracking, melting, and resolidifying of the ceramic glaze. These changes became more pronounced as the power increased. At the highest power setting (2.25 W), craters on the surface with large areas of melted or resolidified glaze surrounded by globules were visible. However, there was little to no exposure of ceramic crystals or visible regular surface roughening. Conclusions: Neither Er:YAG nor Nd:YAG dental lasers exhibited adequate surface modification for bonding of orthodontic brackets on glazed lithium disilicate ceramics compared with the control treated with 9.5% HF. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|