Acid resistance of dentin after erbium:yttrium-aluminum-garnet laser irradiation.
The purpose of this study was to evaluate the acid resistance of erbium:yttrium-aluminum-garnet (Er:YAG) lased sub-surface dentin using a scanning electron microscope (SEM). Dentin disks were exposed to a single pulse of Er:YAG laser irradiation at 80 mJ/pulse under water spray, with the contact sapphire tip vertical to the dentin surfaces (n = 15). Five specimens from the laser-ablated dentin surfaces were observed. Ten specimens were crosscut, exposing the center of the lased point. For five of the specimens, the sub-surface of the lased dentin, with or without 10% phosphoric acid treatment, was evaluated. We used the remaining five specimens to analyze the degree of acid treatment on crosscut surface by observing the re-crosscut surfaces at the lased point. The irradiated dentin surfaces were irregular, scaly or flaky. Three sub-layers were observed in the sub-surface: a superficial, less decalcified layer; an intermediate most decalcified layer; and a deep, normal shade layer. Er:YAG laser irradiation affected the acid resistance of sub-surface dentin.
He
Zhengdi
Z
Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. hezhd0122@yahoo.co.jp
Otsuki
Masayuki
M
Sadr
Alireza
A
Tagami
Junji
J
D001840:Dental Bonding; D003804:Dentin / Q000187:drug effects* / Q000528:radiation effects* / Q000601:surgery / Q000648:ultrastructure; D003806:Dentin Permeability / Q000528:radiation effects; D004351:Drug Resistance; D006801:Humans; D066298:In Vitro Techniques; D053685:Laser Therapy / Q000379:methods*; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000008:administration & dosage; D019246:Tooth Preparation / Q000379:methods*
D010756:Phosphoric Acids; C030242:phosphoric acid