Nasrin Roghanizad1, Reza Fekrazad2, Katayoun Am Kalhori3, Zohreh Khalilak4, Maryam Ali Esmaeili5, Rosane de Fatima Zanirato Lizarelli6. 1. Department of Endodontic, Dental School, Islamic Azad University. 2. Laser Research Center of Medical sciences, AJA university of Medical Sciences. 3. Laser Research Center in Dentistry, Dental Faculty, Tehran university of medical sciences. 4. Department of Endodontics, Dental School, Islamic Azad University. 5. General dentist, Tehran. 6. University of São Paulo, Institute of Physics São Carlos (IFSC).
Abstract
BACKGROUND AND AIM: The aim of this in vitro study was to compare Er, Cr: YSGG laser with ultrasonic preparation on the seal of retrograde cavities. MATERIALS AND METHODS: Twenty-eight maxillary anterior teeth were used in this study. After removing the crowns, the canals were prepared with the step-back technique and filled with guttapercha. Three millimeters below the apex; each root was cut with a fissure diamond bur. The root surfaces were then covered with nail polish and three millimeters deep retrograde class I cavities were prepared, using Er, Cr: YSGG laser (group L=12 roots) or ultrasonic retro-tip (group U=12 roots). Four roots were arranged for negative and positive control groups. Retrograde cavities were then filled with mineral trioxide aggregate (MTA) and teeth were placed in 2% methylene blue dye for 72 hours. The amount of dye penetration in sagittal sections of each tooth was measured with a stereomicroscope. An independent sample t-test was used for statistical analysis. RESULTS: Cavities prepared with the Er, Cr: YSGG laser (1.61 + 0.81) showed significantly less micro-leakage than those prepared with the ultrasound (2.55+ 1.84) (P value =0.02). CONCLUSIONS: Under the conditions of this research, the use of Er, Cr: YSGG laser for retrograde cavity preparation causes significantly less apical leakage and may increase the success rate of endodontic surgeries.
BACKGROUND AND AIM: The aim of this in vitro study was to compare Er, Cr: YSGG laser with ultrasonic preparation on the seal of retrograde cavities. MATERIALS AND METHODS: Twenty-eight maxillary anterior teeth were used in this study. After removing the crowns, the canals were prepared with the step-back technique and filled with guttapercha. Three millimeters below the apex; each root was cut with a fissure diamond bur. The root surfaces were then covered with nail polish and three millimeters deep retrograde class I cavities were prepared, using Er, Cr: YSGG laser (group L=12 roots) or ultrasonic retro-tip (group U=12 roots). Four roots were arranged for negative and positive control groups. Retrograde cavities were then filled with mineral trioxide aggregate (MTA) and teeth were placed in 2% methylene blue dye for 72 hours. The amount of dye penetration in sagittal sections of each tooth was measured with a stereomicroscope. An independent sample t-test was used for statistical analysis. RESULTS: Cavities prepared with the Er, Cr: YSGG laser (1.61 + 0.81) showed significantly less micro-leakage than those prepared with the ultrasound (2.55+ 1.84) (P value =0.02). CONCLUSIONS: Under the conditions of this research, the use of Er, Cr: YSGG laser for retrograde cavity preparation causes significantly less apical leakage and may increase the success rate of endodontic surgeries.
Entities:
Keywords:
Er, Cr: YSGG laser; Retrograde cavities; Root end preparation; Ultrasound
Authors: Carlos Eduardo Francischone; Lia Almeida Prado De Araújo Padovan; Luis Eduardo Marques Padovan; Marco Antônio Húngaro Duarte; Sylvio De Campos Fraga; Victor Prado Curvêllo Journal: Photomed Laser Surg Date: 2005-08 Impact factor: 2.796