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.
Department of Restorative Sciences, Baylor College of Dentistry, Dallas, TX 75246.
C J
CJ
Arcoria
B A
BA
Vitasek-Arcoria
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