scholarly journals Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Naresh Kumar Ravichandran ◽  
Hemanth Tumkur Lakshmikantha ◽  
Hyo-sang Park ◽  
Mansik Jeon ◽  
Jeehyun Kim
Keyword(s):  
Optical Coherence Tomography ◽  
In Vitro Study ◽  
Enamel Surface ◽  
Human Tooth ◽  
Tooth Surface ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Noninvasive Imaging Technique ◽  
Treatment Procedures

Bonding of braces is an essential part in contemporary orthodontic treatment. For the proper strength of bracket bonding, enamel conditioning or surface treatment on tooth surface is required. Treatment on the tooth surface such as prophylaxis smoothing with pumice and enamel etching results in considerable damages to the enamel surface of the tooth. In this study, we have proposed optical coherence tomography as a noninvasive imaging technique for the evaluation of damage induced during such treatment procedures. Using depth intensity analysis of the obtained cross-sectional images, the damage resulting to the enamel surface was studied after prophylaxis smoothening and etching steps.

Enamel loss by prophylaxis and etching treatment in human tooth analyzed using optical coherence tomography- An in vitro study

2018 ◽  
Author(s):  
Naresh Kumar Ravichandran ◽  
Hemanth Tumkur Lakshmikantha ◽  
Pilun Kim ◽  
Sungjo Park ◽  
Mansik Jeon ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
In Vitro Study ◽  
Vitro Study ◽  
Human Tooth ◽  
Optical Coherence

Quantitative articular cartilage sub-surface defect assessment using optical coherence tomography: An in-vitro study

2019 ◽  
Vol 221 ◽  
pp. 125-134 ◽  
Author(s):  
Roman Michalik ◽  
Thorn Pauer ◽  
Nicolai Brill ◽  
Matthias Knobe ◽  
Markus Tingart ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Articular Cartilage ◽  
Surface Defect ◽  
In Vitro Study ◽  
Vitro Study ◽  
Optical Coherence ◽  
Defect Assessment

Contrast‐enhanced optical coherence tomography for melanoma detection: An in vitro study

2020 ◽  
Vol 13 (5) ◽  
Author(s):  
Elmira Jalilian ◽  
Qiuyun Xu ◽  
Luke Horton ◽  
Audrey Fotouhi ◽  
Shriya Reddy ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
In Vitro Study ◽  
Vitro Study ◽  
Optical Coherence ◽  
Melanoma Detection ◽  
Contrast Enhanced

scholarly journals Counterclockwise Drilling with Different Tapered Drills Condenses the Implant Bed—An Optical Coherence Tomography In Vitro Study

Medicina ◽  
2021 ◽  
Vol 57 (9) ◽  
pp. 940
Author(s):  
Rafael Delgado-Ruiz ◽  
Mina Mahdian ◽  
Ilyasse Benezha ◽  
Georgios Romanos
Keyword(s):  
Optical Coherence Tomography ◽  
Bone Microarchitecture ◽  
In Vitro Study ◽  
Apical Region ◽  
Optical Coherence ◽  
Type Iv ◽  
Implant Bed ◽  
One Way Anova ◽  
Apical Area

Background and Objectives: To evaluate the condensation and the microarchitecture of implant bed walls of sites prepared with counterclockwise drilling with tapered implant drills using optical coherence tomography. Materials and Methods: Four drill designs with different wall and tip angles were used. Polyurethane laminas resembling type IV bone microarchitecture were superimposed and clamped with a vice to simulate the coronal, middle, and apical aspects of the implant site. Twenty implant beds were prepared at 1200 rpm in clockwise (control) and counterclockwise (test) directions (N = 160). Optical coherence tomography (OCT) was used to evaluate the condensation and microarchitecture characteristics of the implant bed walls. The relative condensation was calculated using the Image J software Bone application. The microarchitecture was evaluated in reconstructed 3D volumes in XY, XZ, and YZ sections. Statistical analysis was performed using one-way ANOVA. Dunnet test was applied to determine differences between groups. Significance was set as p < 0.05. Results: Counterclockwise drilling (Test) condensed and changed the microarchitecture of the apical regions for all the implant beds in all of the groups when compared to clockwise drilling (control). The apical region of test groups showed the highest relative bone condensation (p = 0.026) when compared to controls. Conclusions: The direction of rotation (counterclockwise drilling) and not the design of tapered drills (tip and wall angles) is responsible for the condensation at the apical area observed in polyurethane blocks. The OCT method can be used for the evaluation of changes in density and microstructure of polyurethane blocks.

scholarly journals Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1876
Author(s):  
Kumiko Matsuzaki ◽  
Yasushi Shimada ◽  
Yasuo Shinno ◽  
Serina Ono ◽  
Kozo Yamaji ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Silicate Glass ◽  
Signal Intensity ◽  
Chemical Elements ◽  
Region Of Interest ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Swept Source ◽  
Morphological Differences

The purpose of this study was to evaluate the mechanism of action and the inhibiting effects of two types of desensitizers against dentin demineralization using pre-demineralized hypersensitivity tooth model in vitro. In this study, we confirmed that a hypersensitivity tooth model from our preliminary experiment could be prepared by immersing dentin discs in an acetic acid-based solution with pH 5.0 for three days. Dentin discs with three days of demineralization were prepared and applied by one of the desensitizers containing calcium fluoro-alumino-silicate glass (Nanoseal, NS) or fluoro-zinc-silicate glass (Caredyne Shield, CS), followed by an additional three days of demineralization. Dentin discs for three days of demineralization (de3) and six days of demineralization (de6) without the desensitizers were also prepared. The dentin discs after the experimental protocol were scanned using swept-source optical coherence tomography (SS-OCT) to image the cross-sectional (2D) view of the samples and evaluate the SS-OCT signal. The signal intensity profiles of SS-OCT from the region of interest of 300, 500, and 700 µm in depth were obtained to calculate the integrated signal intensity and signal attenuation coefficient. The morphological differences and remaining chemical elements of the dentin discs were also analyzed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. SS-OCT images of CS and NS groups showed no obvious differences between the groups. However, SS-OCT signal profiles for both the CS and NS groups showed smaller attenuation coefficients and larger integrated signal intensities than those of the de6 group. Reactional deposits of the desensitizers even after the additional three days of demineralization were observed on the dentin surface in NS group, whereas remnants containing Zn were detected within the dentinal tubules in CS group. Consequently, both CS and NS groups showed inhibition effects against the additional three days of demineralization in this study. Our findings demonstrate that SS-OCT signal analysis can be used to monitor the dentin demineralization and inhibition effects of desensitizers against dentin demineralization in vitro.

scholarly journals Early detection of enamel demineralization by optical coherence tomography

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Meng-Tsan Tsai ◽  
Yen-Li Wang ◽  
Ting-Wei Yeh ◽  
Hsiang-Chieh Lee ◽  
Wen-Ju Chen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Optical Coherence Tomography ◽  
Early Stage ◽  
Scattering Coefficient ◽  
Tooth Surface ◽  
Acidic Environment ◽  
Optical Coherence ◽  
Tooth Demineralization

AbstractEnamel is the outermost layer of the tooth that protects it from invasion. In general, an acidic environment accelerates tooth demineralization, leading to the formation of cavities. Scanning electron microscopy (SEM) is conventionally used as an in vitro tool for the observation of tooth morphology changes with acid attacks. Yet, SEM has intrinsic limitations for the potential application of in vivo detection in the early demineralization process. In this study, a high-resolution optical coherence tomography (OCT) system with the axial and transverse resolutions of 2.0 and 2.7 μm in teeth has been utilized for characterizing the effect of the acidic environment (simulated by phosphoric acid) on the enamel topology. The scattering coefficient and the surface roughness of enamel can be directly derived from the OCT results, enabling a quantitative evaluation of the topology changes with demineralization. The dynamic process induced by the acid application is also recorded and analyzed with OCT, depicting the evolution of the demineralization process on enamel. Notably, the estimated enamel scattering coefficient and surface roughness significantly increase with the application time of acid and the results illustrate that the values of both parameters after demineralization are significantly larger than those obtained before the demineralization, illustrating both parameters could be effective to differentiate the healthy and demineralized teeth and determine the severity. The obtained results unambiguously illustrate that demineralization of the tooth surface can be successfully detected by OCT and further used as an indicator of early-stage cavity formation.

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