Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study (original) (raw)
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Indian Journal of Orthodontics and Dentofacial Research, 2018
Introduction: The purpose of this study is to evaluate surface changes of enamel after using different enamel conditioning agents and bonding adhesives after de-bonding and clean-up of metal and ceramic brackets using optical coherence tomography. Method: Metal and ceramic brackets were bonded onto 120 pre-molars, divided into 4 groups [n=30] which were de-bonded after 24 hours. Enamel conditioners, bonding agents and adhesive resins of four different brands were used in each group. The images of enamel surface were captured with Optical Coherence Tomography [OCT] machine; pre-treatment (T0), post-etching (T1), after bracket de-bonding (T2) and post-cleanup (T3). A spectral domain optical coherence tomography system with 5μm axial spatial resolution was used. This was connected to a pre-configured computer system. A total of 480 images were evaluated for enamel surface evaluation. Results: OCT images obtained allowed us to evaluate the enamel surface after acid-etching and post de-bonding and clean-up procedures. 2D OCT analysis allowed in-depth analysis of enamel loss after various procedures. OCT also assisted in locating remnant adhesive layer after clean-up. Conclusion: OCT is a powerful clinical tool for the use in dentistry and can be used effectively to evaluate enamel surface loss after various procedures.
Evaluation of enamel dental restoration interface by optical coherence tomography
Journal of Biomedical Optics, 2005
Evaluation of molar dental restorations on enamel is performed using optical coherence tomography ͑OCT͒ with 10 m resolution. Images of ϳ50 m failure gaps in the restorations are demonstrated and the OCT images are compared with x-ray and optical microscopy pictures. The results demonstrate the potential of the technique for clinical evaluation of dental restorations.
Scientific Reports, 2021
In clinical orthodontic practice, fixed brackets are widely used for tooth movement and adjustments. Although years of research and development have improved the workability of fixed orthodontic brackets, there are still controversies regarding its plausible destructive influence on the enamel surface of tooth. This, in turn, makes the quantitative assessment of the enamel surface after specific orthodontic treatment procedures important in order to opt for the most effective treatment procedure. Through this study, we show the practical applicability of optical coherence tomography (OCT) as a non-ionizing and nondestructive assessment tool for measuring enamel loss after each step of orthodontic bracket bonding. Two-dimensional and volumetric OCT images are used for the evaluation of the tooth enamel. From the depth intensity profile analysis of cross-sectional OCT images, the changes in the individual internal layer thickness are calculated. A software algorithm was developed to e...
Computational and Mathematical Methods in Medicine, 2015
A routine cavity preparation of a tooth may lead to opening the pulp chamber. The present study evaluates quantitatively, in real time, for the first time to the best of our knowledge, the drilled cavities during dental procedures. An established noninvasive imaging technique, Optical Coherence Tomography (OCT), is used. The main scope is to prevent accidental openings of the dental pulp chamber. Six teeth with dental cavities have been used in this ex vivo study. The real time assessment of the distances between the bottom of the drilled cavities and the top of the pulp chamber was performed using an own assembled OCT system. The evaluation of the remaining dentin thickness (RDT) allowed for the positioning of the drilling tools in the cavities in relation to the pulp horns. Estimations of the safe and of the critical RDT were made; for the latter, the opening of the pulp chamber becomes unavoidable. Also, by following the fractures that can occur when the extent of the decay is too large, the dentist can decide upon the right therapy to follow, endodontic or conventional filling. The study demonstrates the usefulness of OCT imaging in guiding such evaluations during dental procedures.
Optical coherence tomography use in the diagnosis of enamel defects
Journal of biomedical optics, 2016
Molar incisor hypomineralization (MIH) affects the permanent incisors and molars, whose undermineralized matrix is evidenced by lesions ranging from white to yellow/brown opacities to crumbling enamel lesions incapable of withstanding normal occlusal forces and function. Diagnosing the condition involves clinical and radiographic examination of these teeth, with known limitations in determining the depth extent of the enamel defects in particular. Optical coherence tomography (OCT) is an emerging hard and soft tissue imaging technique, which was investigated as a new potential diagnostic method in dentistry. A comparison between the diagnostic potential of the conventional methods and OCT was conducted. Compared to conventional imaging methods, OCT gave more information on the structure of the enamel defects as well as the depth extent of the defects into the enamel structure. Different types of enamel defects were compared, each type presenting a unique identifiable pattern when im...
Quality assessment of dental treatments using en-face optical coherence tomography
Journal of Biomedical Optics, 2008
The present study evaluates the potential of en-face optical coherence tomography ͑OCT͒ as a possible noninvasive high resolution method for supplying necessary information on the material defects of dental prostheses and microleakage at prosthetic interfaces. Teeth are also imaged after several treatment methods to asses material defects and microleakage at the tooth-filling interface, and the presence or absence of apical microleakage, as well as to evaluate the quality of bracket bonding on dental hard tissue. C-scan and B-scan OCT images as well as confocal images are acquired from a large range of samples. Gaps between the dental interfaces and material defects are clearly exposed.
En-Face Optical Coherence Tomography And Fluorescence In Evaluation Of Orthodontic Interfaces
2009
Bonding has become a routine procedure in several dental specialties – from prosthodontics to conservative dentistry and even orthodontics. In many of these fields it is important to be able to investigate the bonded interfaces to assess their quality. All currently employed investigative methods are invasive, meaning that samples are destroyed in the testing procedure and cannot be used again. We have investigated the interface between human enamel and bonded ceramic brackets non-invasively, introducing a combination of new investigative methods – optical coherence tomography (OCT), fluorescence OCT and confocal microscopy (CM). Brackets were conventionally bonded on conditioned buccal surfaces of teeth. The bonding was assessed using these methods. Three dimensional reconstructions of the detected material defects were developed using manual and semi-automatic segmentation. The results clearly prove that OCT, fluorescence OCT and CM are useful in orthodontic bonding investigations.
Dental and Medical Problems, 2017
This paper presents an overview of the current knowledge about non-invasive investigations using optical coherence tomography (OCT)-structural imaging of oral tissues and biomaterials applied in vivo and in vitro-employed in the field of orthodontics. Optical coherence tomography is an emerging technology for producing high-resolution cross-sectional imagery. OCT provides cross-sections of tissues in a non-contact and non-invasive manner. The device measures the time delay and the intensity of light scattered or reflected off of biological tissues, which results in tomographic imaging of their internal structure. This is achieved by scanning tissues at a low resolution. This paper aims to describe the application of OCT in the field of orthodontics, through previous studies investigating the development and disorders of natural tooth hard tissues; the paper also describes OCT studies on dental demineralisation and dental biomaterial characterisation. We explain the working principles of OCT and mention different types of OCT systems in use. Comparisons between OCT and other commonly used orthodontic diagnostic aids are also made and the possible future implications of OCT in orthodontics is discussed.
Characterization of dentin and enamel by use of optical coherence tomography
Applied Optics, 1999
Optical coherence tomographic images of human dentin and enamel are obtained by use of polarizationsensitive optical coherence tomography. A birefringence effect in enamel ͑ ϭ 856 nm͒ and light propagation along dentinal tubules are observed. The group index of refraction for both dentin and enamel was measured at 1.50 Ϯ 0.02 and 1.62 Ϯ 0.02, respectively.