The effects of low-level energy density Nd:YAG irradiation on calculus removal.
This study assessed the effects of using an Nd:YAG laser to remove dental calculus from root surfaces.  Human extracted molar teeth, with extensive calculus attachment to root surfaces, were irradiated with an Nd:YAG beam [power densities (PD) = 1.09 W/cm 2 and 2.19 W/cm 2; energy densities (ED) = 49.2 J/cm 2 and 98.4 J/cm 2].  An additional group of teeth was instrumented with a Gracey 11/12 curette.  A separate group of untreated specimens served as controls.  Specimens were examined under scanning electron microscopy and rated as to the degree of calculus detachment from root surfaces.  Nd:YAG irradiation at low ED did not appreciably affect the integrity of the calculus root surface attachment.  The higher-ED Nd:YAG irradiation appeared to mimic the type of calculus removal depicted with conventional hand instrumentation. Root surface damage from both laser ablations was negligible.
Arcoria
C J
CJ
Department of Restorative Sciences, Baylor College of Dentistry, Dallas, TX 75246.
Vitasek-Arcoria
B A
BA
D003728:Dental Calculus / Q000532:radiotherapy*; D005069:Evaluation Studies as Topic; D006801:Humans; D053685:Laser Therapy; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000528:radiation effects; D010510:Periodontal Diseases / Q000517:prevention & control / Q000532:radiotherapy; D014092:Tooth Root / Q000528:radiation effects