Dentina

Dentin ablation by Ho: YAG laser: correlation of energy versus volume using stereophotogrammetry.
Dentina ablación por Ho: YAG: correlación con el volumen de energía utilizandostereophotogrammetry.
The future use of lasers in endodontics is dependent upon predictable and consistent ablation of dentin. In this pilot study we used an Ho:YAG laser fiberoptic delivery system to apply laser energyto prepared tooth sections in vitro. Longitudinally sectioned single-rooted human teeth were subjected to single-energy pulses varying from 25 to 1750 mJ at a focal length of 1 mm. At differentenergy levels we observed changes in the dentin surface ranging from minute surface pitting to the formation of large craters. Scanning electron microscopy and stereophotogrammetry were used to determinethe relationship between the amount of energy applied to dentin and the extent of dentin ablation. Dentin crater formation was quantified by determining surface area, depth, and volume of cratersproduced. Increases in laser energy were compared with increases in surface area, depth, and volume of craters produced within the range of 150 to 1200 mJ. The Ho:YAG laser fiberoptic delivery system usedin this study provides an effective means of ablating dentin. Three-dimensional stereophotogrammetry may prove to be a useful method for further studies on the effects of laser energy on mineralizedtissues.
El futuro uso de los láseres en endodoncia depende de ablación predecible y consistente de la dentina. En este estudio piloto se utilizó un láser de Ho:YAG fibra óptica sistema de entregapara aplicar energía de láser para las secciones de dientes preparados in vitro. Seccionaron longitudinalmente raíz dientes humanos fueron sometidos a una sola energía pulsos van desde los 25 a 1750 mJ auna distancia focal de 1 mm En los diferentes niveles de energía, los cambios observados en la dentina superficie superficie que van desde minutos picaduras a la formación de grandes cráteres....