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Teche FP, Valenzuela EBS, Tavares JG, Oliveira EWCD, Bittencourt HR, Burnett Júnior LH, Spohr AM. Immediate dentin sealing influences the fracture strength of ultrathin occlusal veneers made of a polymer-infiltrated ceramic network. J Mech Behav Biomed Mater 2022; 133:105331. [DOI: 10.1016/j.jmbbm.2022.105331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/12/2022] [Accepted: 06/18/2022] [Indexed: 10/17/2022]
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Meteyer E, Foucart F, Pezerat C, Picart P. Modeling of speckle decorrelation in digital Fresnel holographic interferometry. OPTICS EXPRESS 2021; 29:36180-36200. [PMID: 34809036 DOI: 10.1364/oe.438346] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
This paper presents analytical modeling of the speckle decorrelation noise in digital Fresnel holographic interferometry. The theoretical analysis is carried out by considering the complex coherence factor between two speckled images from two digitally reconstructed holograms at two different instants. The expression giving the modulus of the coherence factor is established and depends on the local surface deformation and parameters from the holographic setup. The analysis is supported by realistic simulations and experiments. Both simulations and experimental results exhibit a very good agreement with the theoretical prediction.
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Durand JC, Slangen P, Montresor S, Desoutter A, Solieman OY, Fages M, Picart P. Behavior of CAD/CAM ceramic veneers under stress: A 3D holographic study. J Mech Behav Biomed Mater 2021; 118:104436. [PMID: 33761374 DOI: 10.1016/j.jmbbm.2021.104436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 02/24/2021] [Accepted: 02/26/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES Ceramic veneers restorations may undergo damages, such as cracks, fractures, or debonding. Full-field measurements must be carried out in order to visualize and analyze the strain fields. This paper demonstrates that digital holography permits to investigate the mechanical behavior under stress of a natural incisor and a natural incisor reconstructed with CAD/CAM ceramic veneer. METHODS The facial surface of a maxillary central incisor is prepared to receive a monolithic ceramic reconstruction manufactured using a chairside computer-aided design and computer aided manufacturing (CAD/CAM) system (Cerec AC® system, Sirona Dental System®, Bensheim, Germany). One incisor is kept intact for comparison. The samples are sectioned longitudinally to obtain a planar observation of the region of interest. A mechanical indentation head and digital holographic set-ups permit a full-field, contact-less and single-shot measurement of the three-dimensional displacement fields at the surface of the tooth sample when subjected to load. Stain fields are then estimated and comparison of the results between two samples can be carried out. RESULTS 3D displacement, fields and strain fields are measured and highlight the behavior of the region of interest in three directions of space for the ceramic veneer and the natural incisor. The strain maps reveal the local behavior, especially the concentration or the sudden change in strain. The transition zones are clearly observed, particularly for the veneered sample. CONCLUSION Digital holography highlights the localization of stress concentration zones in regions of interest and yields comparative analysis between samples with different tooth preparations. SIGNIFICANCE holography permits to visualize and compare the mechanical response of the ceramic veneer and natural tooth. This helps choosing the mechanical properties of the bonding interface.
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Affiliation(s)
- J-C Durand
- Laboratoire Bioingenierie et Nanosciences, LBN UR-UM104, Université de Montpellier, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France; Department of Prosthetic Dentistry, Faculty of Odontology, Montpellier University, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France.
| | - P Slangen
- EuroMov Digital Health in Motion, Univ Montpellier, IMT Mines Ales, Ales, France.
| | - S Montresor
- Le Mans Université, CNRS UMR 6613, LAUM, Avenue Olivier Messiaen, 72085, Le Mans Cedex 9, France.
| | - A Desoutter
- Laboratoire Bioingenierie et Nanosciences, LBN UR-UM104, Université de Montpellier, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France.
| | - O Y Solieman
- Laboratoire Bioingenierie et Nanosciences, LBN UR-UM104, Université de Montpellier, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France.
| | - M Fages
- Laboratoire Bioingenierie et Nanosciences, LBN UR-UM104, Université de Montpellier, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France; Department of Prosthetic Dentistry, Faculty of Odontology, Montpellier University, 545 Avenue du Professeur Jean Louis Viala, 34193, Montpellier Cedex 5, France.
| | - P Picart
- Le Mans Université, CNRS UMR 6613, LAUM, Avenue Olivier Messiaen, 72085, Le Mans Cedex 9, France.
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Elbadawy AA, Elaziz MHA, Alnazzawi AA, Borzangy SS. Effect of various digital cement space settings on the adaptation of CAD/CAM occlusal veneer "micro-ct evaluation". Dent Mater J 2020; 40:625-630. [PMID: 33390385 DOI: 10.4012/dmj.2020-226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim was to evaluate the adaptation of CAD/CAM occlusal veneer with different cement space settings using micro CT scan. Three groups of IPS e.max-CAD lithium disilicate occlusal veneers with different cement space settings (30, 40, and 50 µm) were produced. A circle with 20 different diameters was centered at the center of the same image position of every scanned specimen using micro CT scan to measure four different locations [Occlusal (OCG), axial (AXG), Marginal (MAG), and absolute marginal discrepancy values (AMD)]. Kruskal-Wallis test revealed that there were no statistical differences between (OCG), (AXG), and (AMD) tested groups (p>0.05), and statistical differences between (MAG) group and other two groups (p<0.05). An increase in the digital cement space significantly improved the marginal fit of IPS e.max-CAD occlusal veneer.
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Affiliation(s)
- Adel A Elbadawy
- Department of fixed prosthodontics, Faculty of Dental Medicine, Al Azhar University.,Department of Substitutive Dental Sciences, Hospital and College of Dentistry, Taibah University
| | - Mohammed H Abd Elaziz
- Department of fixed prosthodontics, Faculty of Dental Medicine, Al Azhar University.,Department of Substitutive Dental Sciences, Hospital and College of Dentistry, Taibah University
| | - Ahmed A Alnazzawi
- Department of Substitutive Dental Sciences, Hospital and College of Dentistry, Taibah University
| | - Sary S Borzangy
- Department of Substitutive Dental Sciences, Hospital and College of Dentistry, Taibah University
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Valenzuela EBS, Andrade JP, da Cunha PFJS, Bittencourt HR, Spohr AM. Fracture load of CAD/CAM ultrathin occlusal veneers luted to enamel or dentin. J ESTHET RESTOR DENT 2020; 33:516-521. [PMID: 32949221 DOI: 10.1111/jerd.12658] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 07/30/2020] [Accepted: 09/04/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To evaluate, in vitro, the fracture load of IPS e.max CAD occlusal veneers at thicknesses of either 0.3 or 0.6 mm luted to enamel or dentin. MATERIALS AND METHODS Fifty human molars were randomly distributed into five groups (n = 10): G1 - healthy teeth (control); G2-0.3-mm-thick veneers luted to enamel; G3-0.6-mm-thick veneers luted to enamel; G4-0.3-mm-thick veneers luted to dentin; and G5-0.6-mm-thick veneers luted to dentin. After the luting procedures, the specimens were immersed in distilled water at 37°C for 24 hours and then subjected to mechanical loading (106 cycles at 200 N load). The specimens were subjected to a fracture load test in a universal testing machine. Two-way ANOVA and Tukey's test (α = 0.05) were used to analyze data. RESULTS Only the thickness factor was significant (P = .002). Values of fracture load followed by distinct letters represent significant differences (P < .05): G1 (3204 N ± 730)ab ; G2 (3144 N ± 729)ab ; G3 (2489 N ± 606)b ; G4 (3591 N ± 776)a ; and G5 (2770 N ± 598)ab . CONCLUSION IPS e.max ultrathin occlusal veneers luted to enamel or dentin obtained fracture load comparable to that of the healthy tooth. CLINICAL SIGNIFICANCE IPS e.max CAD ultrathin occlusal veneers at 0.3 or 0.6-mm-thick seem to provide good perspectives in relation to the clinical use.
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Affiliation(s)
| | - Jonas Pereira Andrade
- Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Hélio Radke Bittencourt
- Department of Statistics, School of Mathematics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Ana Maria Spohr
- Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
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UrliĆ I, Demoli N, Pavan J, Šutej I, BaŠiĆ R, Vranic DN. Measuring tooth vibrations induced during cavity preparation with time-averaged holography and its influence on near vision acuity in dentists. Dent Mater J 2020; 40:123-128. [PMID: 32863378 DOI: 10.4012/dmj.2019-390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to quantify vibrations and their influence on visual acuity. The study consisted of two parts, laboratory and clinical. Time-averaged holographic interferometry (TAHI) method was used in laboratory for measuring the amplitude of tooth vibrations induced by dental handpiece. The amplitudes of tooth vibrations were measured for the three diameters and three speeds. The larger diameter coupled with increasing speed resulted in greater vibration amplitudes, whereby a maximum amplitude of less than one micrometer was detected. For quantifying the natural visual acuity for the corresponding tooth vibrations, we have used the clinical condition approach with miniaturized Snellen optotype as an assessing tool. Central visual acuity did not display variance in visual acuity at rest or under load. Results indicate that the vibrations induced during cavity preparation are not sufficient to negatively affect visual acuity of dentists.
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Affiliation(s)
- Iris UrliĆ
- Department of Ophthalmology, Clinical Hospital Dubrava
| | - Nazif Demoli
- Institute of Physics, Coherent Optics Laboratory
| | - Josip Pavan
- Department of Ophthalmology, Clinical Hospital Dubrava
| | - Ivana Šutej
- Department of Pharmacology, School of Dental Medicine, University of Zagreb
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Xia H, Montresor S, Guo R, Li J, Picart P. Optimal processing scheme for restoration of phase data corrupted by strong decorrelation noise and dislocations. APPLIED OPTICS 2019; 58:G187-G196. [PMID: 31873502 DOI: 10.1364/ao.58.00g187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 09/25/2019] [Indexed: 06/10/2023]
Abstract
The presence of speckle noise and dislocations makes phase restoration potentially difficult in quantitative phase imaging and metrology. Unfortunately, there is no appropriate approach to deal with phase data corrupted by high speckle noise and phase dislocations. Usually, processing schemes may deal with low-pass phase filtering, phase unwrapping, or phase inpainting. This paper discusses the efficient processing to deal with noisy phase maps corrupted with phase dislocations. Six processing schemes, combining four operations, are evaluated. The investigation is carried out by realistic numerical simulations in which strong decorrelation phase noise and phase dislocations are generated. As a result, most robust and faster processing is established. The applicability of the optimal scheme is demonstrated through deformation measurement in dental materials.
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Montrésor S, Memmolo P, Bianco V, Ferraro P, Picart P. Comparative study of multi-look processing for phase map de-noising in digital Fresnel holographic interferometry. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2019; 36:A59-A66. [PMID: 30874091 DOI: 10.1364/josaa.36.000a59] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 12/04/2018] [Indexed: 05/23/2023]
Abstract
This paper presents a comparative study of multi-look approaches for de-noising phase maps from digital holographic interferometry. A database of 160 simulated phase fringe patterns with eight different phase fringe patterns with fringe diversity was computed. For each fringe pattern, 20 realistic noise realizations are generated in order to simulate a multi-look process with 20 inputs. A set of 22 de-noising algorithms was selected and processed for each simulation. Three approaches for multi-look processing are evaluated. Quantitative appraisal is obtained using two metrics. The results show good agreement for algorithm rankings obtained with both metrics. One singular and highly practical result of the study is that a multi-look approach with average looks before noise processing performs better than averaging computed with all de-noised looks. The results also demonstrate that the two-dimensional windowed Fourier transform filtering exhibits the best performance in all cases and that the block-matching 3D (BM3D) algorithm is second in the ranking.
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Tavera Ruiz CG, De La Torre-Ibarra MH, Flores-Moreno JM, Frausto-Reyes C, Santoyo FM. Cortical bone quality affectations and their strength impact analysis using holographic interferometry. BIOMEDICAL OPTICS EXPRESS 2018; 9:4818-4833. [PMID: 30319905 PMCID: PMC6179407 DOI: 10.1364/boe.9.004818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 08/08/2018] [Accepted: 08/09/2018] [Indexed: 06/08/2023]
Abstract
It is now accepted that bone strength is a complex property determined mainly by three factors: quantity, quality and turnover of the bone itself. Most of the patients who experience fractures due to fragility could never develop affectations related to bone mass density (i.e. osteoporosis). In this work, the effect of secondary bone strength affectations are analyzed by simulating the degradation of one or more principal components (organic and inorganic) while they are inspected with a nondestructive optical technique. From the results obtained, a strong correlation among the hydroxyapatite, collagen and water is found that determines the bone strength.
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Affiliation(s)
- Cesar G. Tavera Ruiz
- Centro de Investigaciones en Óptica, Loma Del Bosque 115, León Guanajuato C.P. 37150, México
| | - Manuel H. De La Torre-Ibarra
- Centro de Investigaciones en Óptica - Unidad Aguascalientes, Prol. Constitución 607, Fracc. Reserva Loma Bonita, Aguascalientes, Ags, C.P. 20200, México
| | - J. M. Flores-Moreno
- Centro de Investigaciones en Óptica, Loma Del Bosque 115, León Guanajuato C.P. 37150, México
| | - Claudio Frausto-Reyes
- Centro de Investigaciones en Óptica - Unidad Aguascalientes, Prol. Constitución 607, Fracc. Reserva Loma Bonita, Aguascalientes, Ags, C.P. 20200, México
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