In:
Lasers in Surgery and Medicine, Wiley, Vol. 30, No. 3 ( 2002-03), p. 246-252
Abstract:
The use of Nd:YAG laser has been proposed for endodontic treatment. However, its ability to reduce dentin permeability, which is important for the success of root canal treatment, remains controversial. Study Design/Materials and Methods Nd:YAG laser irradiation was performed in pulsed mode on human dentin. The parameters were: pulse energy (100 mJ), rate (10 pps), and total irradiation time (4 seconds). The crystalline phases, electron diffraction patterns, morphology, and microstructure of specimens after laser irradiation were observed by dark‐field emission transmission electron microscope (TEM). Results Three ultrastructural zones could be delineated in the dentin: (1) an outer zone with an ordered columnar structure composed of hydroxyapatite and β‐tricalcium phosphate, (2) an intermediate zone composed of an amorphous substance (about 40–70 nm in diameter), and (3) an inner zone of well‐crystallized hydroxyapatite grains. These three zones were free of pores or voids. Conclusions Our study demonstrated that laser‐irradiation might be used to reduce dentin permeability. Lasers Surg. Med. 30:246‐252, 2002. © 2002 Wiley‐Liss, Inc.
Type of Medium:
Online Resource
ISSN:
0196-8092
,
1096-9101
Language:
English
Publisher:
Wiley
Publication Date:
2002
detail.hit.zdb_id:
1475539-7
detail.hit.zdb_id:
604493-1
