4 March 2010 Analysis of dental abfractions by optical coherence tomography
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Proceedings Volume 7549, Lasers in Dentistry XVI; 754903 (2010) https://doi.org/10.1117/12.842819
Event: SPIE BiOS, 2010, San Francisco, California, United States
Abstract
Aim and objectives. Abfraction is the pathological loss of cervical hard tooth substance caused by biomechanical overload. High horizontal occlusal forces result in large stress concentrations in the cervical region of the teeth. These stresses may be high enough to cause microfractures in the dental hard tissues, eventually resulting in the loss of cervical enamel and dentin. The present study proposes the microstructural characterization of these cervical lesions by en face optical coherence tomography (eFOCT). Material and methods: 31 extracted bicuspids were investigated using eFOCT. 24 teeth derived from patients with active bruxism and occlusal interferences; they presented deep buccal abfractions and variable degrees of occlusal pathological attrition. The other 7 bicuspids were not exposed to occlusal overload and had a normal morphology of the dental crowns. The dental samples were investigated using an eFOCT system operating at 1300 nm (B-scan at 1 Hz and C-scan mode at 2 Hz). The system has a lateral resolution better than 5 μm and a depth resolution of 9 μm in tissue. OCT images were further compared with micro - computer tomography images. Results. The eFOCT investigation of bicuspids with a normal morphology revealed a homogeneous structure of the buccal cervical enamel. The C-scan and B-scan images obtained from the occlusal overloaded bicuspids visualized the wedge-shaped loss of cervical enamel and damage in the microstructure of the underlaying dentin. The high occlusal forces produced a characteristic pattern of large cracks, which reached the tooth surface. Conclusions: eFOCT is a promising imaging method for dental abfractions and it may offer some insight on the etiological mechanism of these noncarious cervical lesions.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Enikö Demjan, Enikö Demjan, Corina Mărcăuţeanu, Corina Mărcăuţeanu, Dorin Bratu, Dorin Bratu, Cosmin Sinescu, Cosmin Sinescu, Meda Negruţiu, Meda Negruţiu, Ciprian Ionita, Ciprian Ionita, Florin Topală, Florin Topală, Michael Hughes, Michael Hughes, Adrian Bradu, Adrian Bradu, George Dobre, George Dobre, Adrian Gh. Podoleanu, Adrian Gh. Podoleanu, } "Analysis of dental abfractions by optical coherence tomography", Proc. SPIE 7549, Lasers in Dentistry XVI, 754903 (4 March 2010); doi: 10.1117/12.842819; https://doi.org/10.1117/12.842819
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