Measurement of the severity of natural smooth surface (interproximal) caries lesions with polarization sensitive optical coherence tomography

2005 ◽  
Vol 37 (1) ◽  
pp. 78-88 ◽  
Author(s):  
Patara Ngaotheppitak ◽  
Cynthia L. Darling ◽  
Daniel Fried
Keyword(s):  
Optical Coherence Tomography ◽  
Smooth Surface ◽  
Optical Coherence ◽  
Caries Lesions

scholarly journals Assessment of the preventive effects of Nd:YAG laser associated with fluoride on enamel caries using optical coherence tomography and FTIR spectroscopy

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254217
Author(s):  
Marcia Cristina Dias-Moraes ◽  
Pedro Arthur Augusto Castro ◽  
Daísa Lima Pereira ◽  
Patrícia Aparecida Ana ◽  
Anderson Zanardi Freitas ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Laser Irradiation ◽  
Attenuation Coefficient ◽  
Nd:Yag Laser ◽  
Carbonate Content ◽  
Optical Coherence ◽  
Enamel Caries ◽  
Optical Attenuation ◽  
Ph Cycling ◽  
Caries Lesions

Objective This in vitro study characterized and monitored, by Optical Coherence Tomography (OCT) and Fourier Transformed Infrared Spectroscopy (FTIR), the effects of the association of acidulated phosphate fluoride gel (APF-gel) and Nd:YAG (neodymiun:yttrium-aluminum-garnet) laser, as sequencial treatments, in the prevention of incipient enamel caries lesions. Methods 120 human enamel samples were randomized into 3 groups (n = 40): APF-gel (1.23% F-, 4 min.); Laser+APF (Nd:YAG laser irradiation—0.6W, 84.9J/cm2, 10Hz, followed by APF-gel); and APF+Laser (APF-gel followed by laser irradiation). The samples were subjected to a 15-day pH-cycling, evaluated by OCT (quantification of optical attenuation coefficient–OAC) and FTIR (analysis of carbonate and phosphate content) before treatments, after treatments, and on the 5th, 10th and 15th days of pH-cycling. The statistical analysis was performed (α = 5%). Results The Optical Attenuation Coefficient (OAC) assessed by OCT increases with the progression of demineralization, and the Laser+APF presented the highest values of OAC in 10th and 15th days of pH-cycling. Nd:YAG decreased the carbonate content after treatment regardless of the application order of the APF-gel, while APF-gel did not interfere in the composition of enamel. The carbonate content was also changed in the first 5 days of the pH-cycling in all groups. Conclusion Nd:YAG laser irradiation before or after the application of APF-gel did not influence the appearance of incipient caries lesions, showing no synergistic effect. Regardless of the application order of the APF-gel, laser irradiation reduces the carbonate content of the enamel, which also changes during the demineralization process. However, irradiation before the application of APF-gel increased the speed of progression of the lesions, which positively impacts public health as it can prevent caries disease, even in high risk individuals. OCT and FTIR are suitable for assessing this effect.

scholarly journals A Mechanical Approach for Smooth Surface Fitting to Delineate Vessel Walls in Optical Coherence Tomography Images

2019 ◽  
Vol 38 (6) ◽  
pp. 1384-1397 ◽  
Author(s):  
Max L. Olender ◽  
Lambros S. Athanasiou ◽  
Jose M. de la Torre Hernandez ◽  
Eyal Ben-Assa ◽  
Farhad Rikhtegar Nezami ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Smooth Surface ◽  
Surface Fitting ◽  
Optical Coherence ◽  
Mechanical Approach ◽  
Vessel Walls

Validation of swept source optical coherence tomography (SS-OCT) for the diagnosis of smooth surface caries in vitro

2013 ◽  
Vol 41 (1) ◽  
pp. 80-89 ◽  
Author(s):  
Hisaichi Nakagawa ◽  
Alireza Sadr ◽  
Yasushi Shimada ◽  
Junji Tagami ◽  
Yasunori Sumi
Keyword(s):  
Optical Coherence Tomography ◽  
Smooth Surface ◽  
Optical Coherence ◽  
Swept Source
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