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 (${\rm N} = {20}$). Each group received a different bleaching procedure. Then each group was further subdivided into two subgroups (${\rm N} = {10}$) 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 ($\Delta {\rm E}$) 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.

© 2023 Optica Publishing Group

Safe and efficient dental cavity preparation by applying a gradient-in-power approach from Er,Cr:YSGG laser: an in-vitro study

Alyamama MH. Al-Shammari, Ansam M. Salman, and Abdulhadi Al-janabi
Opt. Continuum 2(4) 917-932 (2023)

Highly efficient optical fiber sensor for instantaneous measurement of elevated temperature in dental hard tissues irradiated with an Nd:YaG laser

Zahraa J. Naeem, Ansam M. Salman, Rawaa A. Faris, and Abdulhadi Al-Janabi
Appl. Opt. 60(21) 6189-6198 (2021)

Pulp chamber temperature variation evaluation using fiber Bragg grating sensor

Shweta Pant, Sharath Umesh, and Sundarrajan Asokan
Appl. Opt. 59(34) 10953-10958 (2020)

Ultrafast lithium disilicate veneer debonding time assisted by a CO₂ laser with temperature control

Ayat salam, Rawaa A. Faris, and Abdulhadi Al-janabi
Opt. Continuum 2(4) 825-837 (2023)

Prediction of color change after tooth bleaching using fuzzy logic for Vita Classical shades identification

Luis J. Herrera, Rosa Pulgar, Janiley Santana, Juan C. Cardona, Alberto Guillén, Ignacio Rojas, and María del Mar Pérez
Appl. Opt. 49(3) 422-429 (2010)