Clinical monitoring of early caries lesions using cross polarization optical coherence tomography

Fried, Daniel; Staninec, Michal; Darling, Cynthia L.; Chan, Kenneth H.; Pelzner, Roger B.

doi:10.1117/12.2011014

Cited by 8 publications

(9 citation statements)

References 11 publications

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“…Dentists and non‐dental health care providers alike would benefit from a quick, simple, precise, and accurate caries assessment method . Previous papers describe the use of OCT for dental caries detection ; however, to the best of our knowledge, there exist no studies that describe the use of OCT imaging to screen for caries in adults over 65 years of age.…”

Section: Introductionmentioning

confidence: 99%

Detection and proportion of very early dental caries in independent living older adults

et al. 2015

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Background and Objectives Dental caries is an important healthcare challenge in adults over 65 years of age. Integration of oral health screening into non-dental primary care practice may improve access to preventive dental care for vulnerable populations such as the elderly. Such integration would require easy, fast, and accurate early caries detection tools. Primary goal of this study was to evaluate the diagnostic performance of optical coherence tomography (OCT) imaging for detecting very early caries in the elderly living in community-based settings. The International Caries Detection and Assessment System (ICDAS) served as gold standard. Secondary goal of this study was to provide baseline prevalence data of very early caries lesions in independent living adults aged 65+ years. Materials and Methods Seventy-two subjects were recruited from three sites in Southern California: a retirement community, a senior health fair, and a convalescent hospital. Clinical examination was performed using the ICDAS visual criteria and this was followed by OCT imaging. The two-dimensional OCT images (B-scan) were analyzed with simple software. Locations with a log of back-scattered light intensity (BSLI) below 2.9 were scored as sound, and areas equaling or exceeding 2.9 BSLI were considered carious. Diagnostic performance of OCT imaging was compared with ICDAS score. Results OCT-based diagnosis demonstrated very good sensitivity (95.1%) and good specificity (85.8%). 54.7% of dentate subjects had at least one tooth with very early coronal caries. Conclusions Early coronal decay is prevalent in the unrestored pits and fissures of coronal surfaces of teeth in independent living adults aged 65+ years. Though OCT imaging coupled with a simple diagnostic algorithm can accurately detect areas of very early caries in community-based settings, existing devices are expensive and not well-suited for use by non-dental health care providers. Simple, inexpensive, fast, and accurate tools for early caries detection by field health care providers working in non-traditional settings are urgently needed to support inter-professional dental health management. Lasers Surg.

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Section: Introductionmentioning

confidence: 99%

Detection and proportion of very early dental caries in independent living older adults

et al. 2015

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“…Swept‐source OCT (SS‐OCT) is a variant of OCT , in which the light source is a tunable laser that sweeps near‐infrared wavelength light within millisecond‐scan delays at kilohertz rates to achieve real‐time imaging. Previous studies reported that SS‐OCT had a high degree of sensitivity and specificity to detect caries and enamel cracks . In addition to offering high resolution morphological images, the OCT signal can be used to estimate attenuation coefficient ( μ t ) of enamel and dentin .…”

Section: Introductionmentioning

confidence: 99%

Clinical assessment of non carious cervical lesion using swept‐source optical coherence tomography

Wada

Shimada

Ikeda

et al. 2014

Journal of Biophotonics

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Non-carious cervical lesions (NCCLs) involve various forms of tooth loss with different etiologies. This study aimed to utilize swept-source optical coherence tomography (SS-OCT) at 1300 nm wavelength range in vitro and in vivo to evaluate and clarify the mechanism of NCCLs. In the in vitro phase, a dentin attenuation coefficient (μt ) derived from the SS-OCT signal at NCCL was compared with mineral loss obtained from transverse microradiography (TMR) to determine a μt threshold to discriminate demineralization of cervical dentin in vivo. In the clinical study, 242 buccal surfaces were investigated in 35 subjects. Presence and dimensions of NCCLs, cervical cracking and the degree of demineralization at the exposed cervical dentin were determined using SS-OCT. Dentin demineralization was observed in 69% of NCCLs. SS-OCT results confirm that dentin mineral loss and occlusal attrition were associated with larger NCCLs, and can be considered as an etiological factor in formation and progress of these lesions. (A) We determined the attenuation coeffcient (μt ) threshold of SS-OCT signal for the detection of demineralization (1.21) from in vitro study. DEM: demineralized dentin, sound: sound dentin. (B) Using the μt threshold, we observed NCCLs in vivo to detect the demineralization in cervical dentin. SS-OCT scanning was performed along the red line. (C) SS-OCT image obtained along the red line in B. In SS-OCT, brightness of dentin beneath the NCCL was increased (arrow) compared with intact zone. The cervical dentin was slightly demineralized (μt : 1.25). e: enamel, d: dentin, g: gingiva.

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“… 10 , 19 This study utilized a cross-polarization type OCT, which is a functional modification of SS-OCT that has been implemented in visualization of dental biofilms, enamel demineralization and remineralization. 16 , 17 Unlike SS-OCT, CP-OCT detects backscattered signals that are perpendicular to linearly polarized signals and omits the specular reflections. 17 Therefore, silver nitrate was used as a contrast agent to enhance the visualization of interfacial gap under CP-OCT.…”

Section: Discussionmentioning

confidence: 99%

“… 16 , 17 Unlike SS-OCT, CP-OCT detects backscattered signals that are perpendicular to linearly polarized signals and omits the specular reflections. 17 Therefore, silver nitrate was used as a contrast agent to enhance the visualization of interfacial gap under CP-OCT. The optical appearance of gap under CP-OCT in the form of bright white clusters of pixels results from light reflection caused by interaction between the incident light and silver particles diffused into the gap, rather than specular reflections as in SS-OCT. 20…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of microleakage in class-II bulk-fill composite restorations

Turkistani

Nasir

Merdad

et al. 2020

Journal of Dental Sciences

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Background/purpose Despite the clinical appeal of restoring deep class II cavities in single increment using bulk-fill resin composite, sealing of bulk-filled composite restorations is a concern. This study evaluated interfacial adaptation of bulk-fill composite restoration to axial wall and gingival floor of class II cavities using cross-polarization optical coherence tomography (CP-OCT). Materials and methods Box-shaped class II cavities were prepared in extracted molars and divided into three groups ( n = 7) according to adhesive used; Clearfil SE Bond 2 (SE2), Tetric-N Bond Self-Etch (TSE) or Tetric-N Bond Universal (TNU). All adhesives were applied in self-etch mode and according to manufacturers' recommendation. Then, preparations were bulk-filled with Filtek Bulk Fill Posterior Restorative resin composite and immersed in a contrast agent. Tomographic images of axial wall and gingival floor of each restoration were obtained by CP-OCT (IVS-300, Santec) with a central wavelength of 1330 nm and were imported to an image analysis software to quantify microleakage. Results Mann–Whitney U test showed statistically significant difference in microleakage percentage between the groups at both axial wall and gingival floor ( p < 0.05). SE2 group had the lowest percentage of microleakage ( p < 0.05), as only few cross-sections showed areas of reflections from contrast agent penetrating into axial wall (8.23 ± 6.8) and gingival floor (7.07 ± 4.1), followed by TNU group (18.13 ± 12.9 axially and 30.61 ± 11.9 gingivally). Microleakage was frequently observed at the axial wall and gingival floor of TSE group, showing the highest percentages of 25.50 ± 12.5 and 36.97 ± 10.2, respectively ( p < 0.05). Conclusion All tested groups exhibited different extent of interfacial microleakage, however, two-step self-etch adhesive yielded superior adaptation in comparison to one-step self-etch adhesive and universal adhesive.

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Clinical monitoring of early caries lesions using cross polarization optical coherence tomography

Cited by 8 publications

References 11 publications

Detection and proportion of very early dental caries in independent living older adults

Detection and proportion of very early dental caries in independent living older adults

Clinical assessment of non carious cervical lesion using swept‐source optical coherence tomography

Evaluation of microleakage in class-II bulk-fill composite restorations

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