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Effect of Nd:YAG radiation at millisecond pulse duration on dentine crater depth
Author(s) -
McDonald Ailbhe V.,
Claffey Noel M.,
Pearson Gavin J.,
Blau Werner,
Setchell Derrick J.
Publication year - 2000
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/1096-9101(2000)27:3<213::aid-lsm3>3.0.co;2-6
Subject(s) - impact crater , laser , molar , materials science , irradiation , pulse duration , radiation , dentistry , optics , medicine , physics , astronomy , nuclear physics
Background and Objective The effect of laser parameters on laser‐dentine interaction has not been explored fully. This in vitro study investigated the effect on dentine crater depth of Nd:YAG laser radiation with varying repetition rates, total delivered energy, and dentine site either dyed or undyed. Study Design/Material and Methods One hundred forty‐four caries‐free third molars were sectioned transversely to provide 288 upper and lower cut surfaces. The upper surfaces were dyed (IR5). These upper and lower cut surfaces were exposed to an Nd:YAG laser with a 7 millisecond (msec) pulse duration, pulse repetition rates (RR) of 2.5, 5.4, and 10.5 Hz, and four total energies (2.28, 2.64, 3.6, 4.2 joules). Dentine crater depth was measured by using a Reflex microscope. Results were statistically analysed with analysis of variance. Results Crater depth increased with increase in total delivered energy and in dyed and inner dentine sites ( P < 0.0001) but decreased with increasing repetition rate ( P < 0.0001). Conclusions Increasing energy, dyed, and inner dentine sites produced deeper craters. Lasers Surg. Med. 27:213–223, 2000. © 2000 Wiley‐Liss, Inc.