Assessment of curing behavior of light‐activated dental composites using intensity correlation based multiple reference optical coherence tomography

Dsouza, Roshan; Subhash, Hrebesh M.; Neuhaus, Kai; Kantamneni, Ramakrishna; McNamara, Paul; Hogan, Josh; Wilson, Carol; Leahy, Martin J.

doi:10.1002/lsm.22447

Cited by 14 publications

(7 citation statements)

References 38 publications

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“…As discussed in the previous subsection, micro-CT is commonly used to evaluate micro-infiltrations for dentures and denture sealants, as well as adhesives restorations [20]. From 3D micro-CT assessments, the results regarding the width/thickness of the adhesive layer obtained in the present study have been shown to be in good agreement with the values given in the literature, of about 0.02 mm [21][22][23]-for Group 1, and even for Group 2.…”

Section: Effect Of Mps Inclusion In the Adhesives: Comparison Betweensupporting

confidence: 88%

“…Another imaging technique that can be considered for such assessments is OCT [16][17][18][19][20][21][22]. This IR laser-based low-coherence tomography technique allows for the analysis of the surface of interfaces between the restoration material and the dental structures [20].…”

Section: Comparison Between Optical Microscopy and Micro-ct Resultsmentioning

confidence: 99%

“…A second direction of research in this domain refers to the development and application of different techniques to analyze occurrence of microleakages, including [ 7 , 8 , 9 , 10 , 11 ]: (i) penetration with different dyes, such as fuchsin or methylene blue; (ii) testing of marginal integrity by using penetration with radioactive isotopes, bacteria, or using the pressure of a compressed air source; (iii) electronic and electrochemical microleakage monitoring; (iv) imaging assessments with scanning electron microscopy (SEM) [ 12 ], replication and SEM, fluorescent, confocal or stereomicroscopy [ 13 , 14 , 15 ], as well as optical coherence tomography (OCT) [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy

et al. 2020

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Dental adhesives are used in a wide range of applications, including to place direct composite restorations in frontal or posterior teeth. One of the most frequent causes for the failure of composite resin restorations is microleakages. The first aim of this work is to introduce a new type of self-etched dental adhesive doped with magnetic nanoparticles (MPs) synthetized in the laboratory. The scope is to produce adhesives with a minimized width/thickness to decrease the risk of microleakages. The second aim is to assess the width/thickness of the adhesive layer in all the characteristic areas of the teeth using both the less precise but most common optical microscopy and the more accurate and volumetric micro-Computed Tomography (CT) investigations. Twenty extracted teeth have been divided into four groups: Group 1 includes ‘blank’ samples with adhesives that are not doped with MPs; Group 2 includes samples with adhesives doped with MPs; Groups 3 and 4 include samples with adhesives doped with MPs that are subjected to an active magnetic field for 5 and 10 min, respectively. Microscopy investigations followed by micro-CT and EDAX are performed on the adhesive. While a rather good agreement is obtained between the microscopy and micro-CT results, the capability of the latter to offer a full volumetric reconstruction of the layer is exploited to analyze the adhesion of the four considered dental materials. Thus, from micro-CT results the graphs of the surface areas as functions of the adhesive layer width are modeled mathematically, as well as the volume of sealants, for each of the four groups. To our knowledge, it is the first time that such a methodology is used. Characteristic parameters are extracted and the ascertainment of the optimal parameter that should be utilized for such assessments is discussed. The study demonstrates the adhesion improvement produced for Groups 3 and 4, where MPs are used. It also concludes that the magnetic field should be applied to the adhesive material for the longest possible exposure time (with a trade-off with the clinical duration of the treatment).

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Section: Effect Of Mps Inclusion In the Adhesives: Comparison Betweensupporting

confidence: 88%

Section: Comparison Between Optical Microscopy and Micro-ct Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy

et al. 2020

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“…The advantages, as well as the limitations/complementarities of OCT in relationship to other investigation methods have been reported in respect to imaging teeth [25][26][27] or different types of dental constructs [28][29][30][31][32][33]. Relevant to non-destructive testing, targeted here, the impact of the OCT light source, of its central wavelength, as well as of specular reflection, have already been considered [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography

et al. 2017

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Calibration loss of ovens used in sintering metal ceramic prostheses leads to stress and cracks in the material of the prostheses fabricated, and ultimately to failure of the dental treatment. Periodic calibration may not be sufficient to prevent such consequences. Evaluation methods based on firing supplemental control samples are subjective, time-consuming, and rely entirely on the technician's skills. The aim of this study was to propose an alternative procedure for such evaluations. Fifty prostheses were sintered in a ceramic oven at a temperature lower, equal to or larger than the temperature prescribed by the manufacturer. A non-destructive imaging method, swept source (SS) optical coherence tomography (OCT) was used to evaluate comparatively the internal structure of prostheses so fabricated. A quantitative assessment procedure is proposed, based on en-face OCT images acquired at similar depths inside the samples. Differences in granulation and reflectivity depending on the oven temperature are used to establish rules-of-thumb on judging the correct calibration of the oven. OCT evaluations made on a regular basis allow an easy and objective monitoring of correct settings in the sintering process. This method can serve rapid identification of the need to recalibrate the oven and avoid producing prostheses with defects.

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“…The repeated recirculation of light creates multiple optical delays, generating multiple reference (MR) signals that allow multiple scan ranges for deeper axial imaging. The performance of a free-space MR-OCT system has been previously demonstrated by imaging the in vivo fingertip and forearm [24] and for nondestructive testing applications [25,26] . In addition, we have recently reported the feasibility of building a miniature configuration of an MR-OCT using off-the-shelf microoptical components [27] .…”

mentioning

confidence: 99%

Feasibility study of phase-sensitive imaging based on multiple reference optical coherence tomography

et al. 2017

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Multiple reference optical coherence tomography (MR-OCT) is a recently developed, low-cost and compact time-domain OCT solution for primary care and consumer level applications. A combination of a voice coil actuator and a partial mirror (PM) extends the scan range for imaging depths of approximately 1 mm in biological samples. Our previous research on MR-OCT is based only on intensity information obtained from the depth-resolved interference signal. In this Letter, we extract the phase information from the MR-OCT signal and, hence, provide an additional contrast modality. The phase sensitivity of the system is measured to be approximately 0.2 and 1.5 rad for the first and twelfth orders of reflection when using a mirror as the sample. This Letter describes first results of phase-sensitive data measured on a phantom obtained with MR-OCT. Data from a chick embryo chorioallantoic membrane (CAM) is used to demonstrate the feasibility of MR-OCT for in vivo phase-sensitive imaging.

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Assessment of curing behavior of light‐activated dental composites using intensity correlation based multiple reference optical coherence tomography

Cited by 14 publications

References 38 publications

Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy

Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy

Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography

Feasibility study of phase-sensitive imaging based on multiple reference optical coherence tomography

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