Enamel Thickness Determination by Optical Coherence Tomography: In vitro Validation

2016 ◽  
Vol 50 (4) ◽  
pp. 400-406 ◽  
Author(s):  
Amnah Algarni ◽  
Hobin Kang ◽  
Daniel Fried ◽  
George J. Eckert ◽  
Anderson T. Hara
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
Clinical Tool ◽  
High Agreement ◽  
Enamel Thickness ◽  
Transversal Section ◽  
Imaging Tool ◽  
Human Enamel ◽  
Thickness Measurements

Optical coherence tomography (OCT) has been introduced in dentistry as a nondestructive diagnostic imaging tool that does not utilize ionizing radiation. This study investigated the agreement between polarization-sensitive OCT (PS-OCT), microcomputed tomography (μ-CT), and histology for enamel thickness measurements. Human enamel samples were prepared and evaluated with μ-CT and PS-OCT and then sectioned and observed via digital transversal light microscopy. For all methods, a standard transversal section (b-scan) in each sample was selected, and the enamel thickness was measured at three predetermined positions using ImageJ analysis software. The results revealed significant high agreement between all tested methods, indicating the potential of PS-OCT as a clinical tool to effectively measure enamel thickness.

scholarly journals Enamel Thickness before and after Orthodontic Treatment Analysed in Optical Coherence Tomography

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Julia Seeliger ◽  
Monika Machoy ◽  
Robert Koprowski ◽  
Krzysztof Safranow ◽  
Tomasz Gedrange ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Orthodontic Treatment ◽  
Adhesive Bonding ◽  
Orthodontic Brackets ◽  
Optical Coherence ◽  
Two Dimensional ◽  
Enamel Thickness ◽  
Bonding System ◽  
Before And After

Despite the continuous development of materials and techniques of adhesive bonding, the basic procedure remains relatively constant. The technique is based on three components: etching substance, adhesive system, and composite material. The use of etchants during bonding orthodontic brackets carries the risk of damage to the enamel. Therefore, the article examines the effect of the manner of enamel etching on its thickness before and after orthodontic treatment. The study was carried out in vitro on a group of 80 teeth. It was divided into two subgroups of 40 teeth each. The procedure of enamel etching was performed under laboratory conditions. In the first subgroup, the classic method of enamel etching and the fifth-generation bonding system were used. In the second subgroup, the seventh-generation (self-etching) bonding system was used. In both groups, metal orthodontic brackets were fixed and the enamel was cleaned with a cutter fixed on the micromotor after their removal. Before and after the treatment, two-dimensional optical coherence tomography scans were performed. The enamel thickness was assessed on the two-dimensional scans. The average enamel thickness in both subgroups was not statistically significant.

Dental optical coherence tomography: a comparison of two in vitro systems

1999 ◽  
Vol 29 (2) ◽  
pp. 85-89 ◽  
Author(s):  
L L Otis ◽  
B W Colston ◽  
M J Everett ◽  
H Nathel
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
In Vitro Systems

scholarly journals Optimization of X-ray Investigations in Dentistry Using Optical Coherence Tomography

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4554
Author(s):  
Ralph-Alexandru Erdelyi ◽  
Virgil-Florin Duma ◽  
Cosmin Sinescu ◽  
George Mihai Dobre ◽  
Adrian Bradu ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Radiation Dose ◽  
Imaging Techniques ◽  
Image Resolution ◽  
Optical Coherence ◽  
X Rays ◽  
High Quality ◽  
X Ray

The most common imaging technique for dental diagnoses and treatment monitoring is X-ray imaging, which evolved from the first intraoral radiographs to high-quality three-dimensional (3D) Cone Beam Computed Tomography (CBCT). Other imaging techniques have shown potential, such as Optical Coherence Tomography (OCT). We have recently reported on the boundaries of these two types of techniques, regarding. the dental fields where each one is more appropriate or where they should be both used. The aim of the present study is to explore the unique capabilities of the OCT technique to optimize X-ray units imaging (i.e., in terms of image resolution, radiation dose, or contrast). Two types of commercially available and widely used X-ray units are considered. To adjust their parameters, a protocol is developed to employ OCT images of dental conditions that are documented on high (i.e., less than 10 μm) resolution OCT images (both B-scans/cross sections and 3D reconstructions) but are hardly identified on the 200 to 75 μm resolution panoramic or CBCT radiographs. The optimized calibration of the X-ray unit includes choosing appropriate values for the anode voltage and current intensity of the X-ray tube, as well as the patient’s positioning, in order to reach the highest possible X-rays resolution at a radiation dose that is safe for the patient. The optimization protocol is developed in vitro on OCT images of extracted teeth and is further applied in vivo for each type of dental investigation. Optimized radiographic results are compared with un-optimized previously performed radiographs. Also, we show that OCT can permit a rigorous comparison between two (types of) X-ray units. In conclusion, high-quality dental images are possible using low radiation doses if an optimized protocol, developed using OCT, is applied for each type of dental investigation. Also, there are situations when the X-ray technology has drawbacks for dental diagnosis or treatment assessment. In such situations, OCT proves capable to provide qualitative images.

scholarly journals Retinal nerve fibre layer thickness measurements in childhood glaucoma: the role of scanning laser polarimetry and optical coherence tomography

2021 ◽  
Author(s):  
Mael Lever ◽  
Christian Halfwassen ◽  
Jan Darius Unterlauft ◽  
Nikolaos E. Bechrakis ◽  
Anke Manthey ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Nerve Fibre ◽  
Retinal Nerve Fibre Layer ◽  
Scanning Laser ◽  
Optical Coherence ◽  
Scanning Laser Polarimetry ◽  
Laser Polarimetry ◽  
Nerve Fibre Layer ◽  
Thickness Measurements ◽  
Inferior Quadrant

Abstract Purpose A central diagnostic tool in adult glaucoma is the peripapillary retinal nerve fibre layer (pRNFL) thickness. It can be assessed by scanning laser polarimetry (SLP) or optical coherence tomography (OCT). However, studies investigating the relevance of pRNFL measurements in children are rare. This study aims to compare the glaucoma diagnosing ability of SLP and OCT pRNFL thickness measurements in a paediatric population. Methods This retrospective study included 105 children (glaucoma: 22 (21.0%); healthy glaucoma suspects: 83 (79.0%)) aged 4–18 years, examined with SLP (GDxPro/ECC, Carl Zeiss Meditec) and spectral-domain OCT (SPECTRALIS®, Heidelberg Engineering). The thickness of pRNFL sectors was compared between diseased and healthy participants. Areas under the receiver-operating characteristic curves (AUC) and logistic regression results were used to compare the glaucoma discriminative capacity between SLP and OCT measurements. Results Using OCT, pRNFL thickness was decreased in the superior, nasal, and inferior quadrants of glaucoma patients compared to healthy controls (P < 0.001, each). With SLP, such a difference was only observed in the inferior quadrant (P = 0.011). A correlation between glaucoma diagnosis and OCT-measured pRNFL thickness was found in all quadrants (P < 0.001) other than the temporal. With SLP, a correlation was found for the total average thickness (P = 0.037) and inferior quadrant (P = 0.0019). Finally, the AUCs of OCT measurements were markedly higher than those of SLP (e.g., inferior quadrant: OCT 0.83, SLP 0.68). Conclusion pRNFL thickness measurements using both OCT and SLP, correlate notably with the presence of glaucoma. In general, the diagnostic performance of pRNFL thickness measurements seems higher for OCT than for SLP. Thus, pRNFL thickness measurements could provide important information, complementing conventional clinical and functional parameters in the diagnostic process of paediatric glaucoma.

The reproducibility of ultrasonic enamel thickness measurements: an in vitro study

2004 ◽  
Vol 32 (1) ◽  
pp. 83-89 ◽  
Author(s):  
C. Louwerse ◽  
M. Kjaeldgaard ◽  
M.C.D.N.J.M. Huysmans
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Enamel Thickness ◽  
Thickness Measurements

scholarly journals In Vitro Enamel Thickness Measurements with Ultrasound

2015 ◽  
Vol 41 (1) ◽  
pp. 301-308 ◽  
Author(s):  
Khalid Hussain Sindi ◽  
Nigel Lawrence Bubb ◽  
Diana Lynn Gutteridge ◽  
Joseph Anthony Evans
Keyword(s):  
Enamel Thickness ◽  
Thickness Measurements
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