Abstract
This in-vitro study evaluates the efficacy of the teeth bleaching
approach using different laser wavelengths (405 nm blue diode,
940 nm infrared diode, and Er,Cr:YSGG 2780 nm lasers) in
comparison to the conventional method using light-emitting diode (LED)
sources (420–480) nm. Eighty caries-free sound human premolars
were randomly divided into four groups (N=20). Each group received a different
bleaching procedure. Then each group was further subdivided into two
subgroups (N=10) stained with different solutions.
The pulp chamber temperature rise was recorded using an optical fiber
sensor with a novel design and fabrication. The color was analyzed
using a digital spectrophotometer. Five samples of each subgroup were
tested for surface roughness, while the others were tested for Vickers
microhardness. The bleaching process with a short wavelength
405 nm blue diode laser showed the best results for the shade,
with a minimum pulpal temperature increase indicating no possible
necrosis and hence maintaining tooth vitality. Additionally, a
remarkable reduction in bleaching time was achieved compared to the
conventional approach. This process also yielded the highest color
change (ΔE) and increased microhardness, with no
noticeable change to the tooth roughness. The 405 nm blue diode
laser applied for bleaching showed the best bleaching activity against
tested stains and negligible pulpal temperature rise with a noticeable
reduction in the bleaching time. The proposed novel method to measure
temperature change could be used to develop a promising smart sensor
for quick, effective, repeatable, and in-situ monitoring of human body
temperature.
Funder
Ministry of Higher Education and
Scientific Research
University of Baghdad
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
1 articles.
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