Literatura académica sobre el tema "Occlusal photographic images"
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Artículos de revistas sobre el tema "Occlusal photographic images"
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Moncada, G., F. Silva, P. Angel, OB Oliveira, MC Fresno, P. Cisternas, E. Fernandez, J. Estay y J. Martin. "Evaluation of Dental Restorations: A Comparative Study Between Clinical and Digital Photographic Assessments". Operative Dentistry 39, n.º 2 (1 de marzo de 2014): e45-e56. http://dx.doi.org/10.2341/12-339-c.
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SUMMARY The aim of this study was to compare the efficacy of a direct clinical evaluation method with an indirect digital photographic method in assessing the quality of dental restorations. Seven parameters (color, occlusal marginal adaptation, anatomy form, roughness, occlusal marginal stain, luster, and secondary caries) were assessed in 89 Class I and Class II restorations from 36 adults using the modified US Public Health Service/Ryge criteria. Standardized photographs of the same restorations were digitally processed by Adobe Photoshop software, separated into the following four groups and assessed by two calibrated examiners: Group A: The original photograph displayed at 100%, without modifications (IMG100); Group B: Formed by images enlarged at 150% (IMG150); Group C: Formed by digital photographs displayed at 100% (mIMG100), with digital modifications (levels adjustment, shadow and highlight correction, color balance, unsharp Mask); and Group D: Formed by enlarged photographs displayed at 150% with modifications (mIMG150), with the same adjustments made to Group C. Photographs were assessed on a calibrated screen (Macbook) by two calibrated clinicians, and the results were statistically analyzed using Wilcoxon tests (SSPS 11.5) at 95% CI. Results: The photographic method produced higher reliability levels than the direct clinical method in all parameters. The evaluation of digital images is more consistent with clinical assessment when restorations present some moderate defect (Bravo) and less consistent when restorations are clinically classified as either satisfactory (Alpha) or in cases of severe defects (Charlie). Conclusion: The digital photographic method is a useful tool for assessing the quality of dental restorations, providing information that goes unnoticed with the visual-tactile clinical examination method. Additionally, when analyzing restorations using the Ryge modified criteria, the digital photographic method reveals a significant increase of defects compared to those clinically observed with the naked eye. Photography by itself, without the need for enlargement or correction, provides more information than clinical examination and can lead to unnecessary overtreatment.
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Travassos da Rosa Moreira Bastos, Renata, Priscila Teixeira da Silva y David Normando. "Reliability of qualitative occlusal tooth wear evaluation using an intraoral scanner: A pilot study". PLOS ONE 16, n.º 3 (25 de marzo de 2021): e0249119. http://dx.doi.org/10.1371/journal.pone.0249119.
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Dental wear analysis through the use of an intraoral scanner is a reality of modern dentistry. This study aimed to investigate the reliability of qualitative tooth wear evaluation through three-dimensional images captured with an intraoral scanner and compared to clinical and photographic examinations. Eighteen adult volunteers of both genders (18 to 55 years old) were submitted to clinical exams, intraoral photographs and intraoral scanning protocol using an optical scanner (TRIOS® Pod, 3Shape, Copenhagen, Denmark). Occlusal tooth wear, from second to second premolars, was measured by two evaluators and reevaluated after 30 days, according to a slight modification of the method described by Mockers et al. Weighted Kappa was used to measure intra and inter-examiner agreement. The Friedman test was used to verify the differences among methods. Random and systematic errors were assessed using Bland-Altman plots. All statistical analysis was performed with p<0.05. There was a substantive agreement for clinical (K = 0.75) and photographic exams (K = 0.79) and a moderate agreement for intraoral scanner analysis (K = 0.60) for inter-examiner evaluation. A substantial intra-examiner agreement was obtained for both evaluators. No significant difference between the methods was observed (p = 0.7343 for examiner 1 and 0.8007 for examiner 2). The Bland-Altman plot confirmed no systematic errors between the methods and a random error of 0.25 with the scanner method when compared to clinical assessment. All three methods showed reliability in qualitative occlusal tooth wear evaluation. Intraoral scanning seems to be a sound and reliable tool to evaluate tooth wear when compared to traditional methods, considering the lower inter-examiner agreement and the inherent limitations of this pilot study. Further research will be necessary in order to achieve more robust evidence.
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Berdouses, Elias D., Georgia D. Koutsouri, Evanthia E. Tripoliti, George K. Matsopoulos, Constantine J. Oulis y Dimitrios I. Fotiadis. "A computer-aided automated methodology for the detection and classification of occlusal caries from photographic color images". Computers in Biology and Medicine 62 (julio de 2015): 119–35. http://dx.doi.org/10.1016/j.compbiomed.2015.04.016.
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Espíndola-Castro, LF, A. Rosenblatt, A. Galembeck y GQM Monteiro. "Dentin Staining Caused by Nano-silver Fluoride: A Comparative Study". Operative Dentistry 45, n.º 4 (13 de febrero de 2019): 435–41. http://dx.doi.org/10.2341/19-109-l.
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Clinical Relevance The new formulations of nano-silver fluoride caused less dentin staining than the already available commercial agents 35% silver fluoride and silver diamine fluoride at 30% and 38%. SUMMARY The objective of this study was to evaluate the dentin staining potential of nano-silver fluoride (NSF 600 and 1500 ppm) compared with the following commercially available cariostatic agents: Advantage Arrest (Elevate Oral Care, West Palm Beach, FL, USA), Riva Star (SDI, Victoria, Australia), and Cariestop (Biodinâmica, Paraná, Brazil). Seventy-five extracted human molars were sectioned at the cementoenamel junction, and the occlusal enamel was removed for exposure of coronary dentin. The samples were divided among the five agents tested (n=15). The dentin staining (ΔE/ΔL) was analyzed with a digital spectrophotometer (VITA Easyshade, VITA Zahnfabrik, Bad Säckingen, Germany) at three different time points (before application, after two weeks, and after four weeks). Photographic images were also performed. The Kruskal-Wallis and Mann-Whitney tests compared the mean ΔE and ΔL values between groups. The NSF 600 and 1500 ppm resulted in the smallest color change (ΔE=1.02 and 1.53) and dentin staining after four weeks (ΔL=−0.76 and −1.2). The new formulations differed significantly from the commercial cariostatic agents (p<0.001). NSF might be an alternative to silver diamine fluoride since it does not compromise esthetics.
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Corte, Cristiane Cherobini Dalla, Bruno Lopes da Silveira y Mariana Marquezan. "Influence of occlusal plane inclination and mandibular deviation on esthetics". Dental Press Journal of Orthodontics 20, n.º 5 (octubre de 2015): 50–57. http://dx.doi.org/10.1590/2177-6709.20.5.050-057.oar.
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Objective:The aim of this study was to assess the degree of perception of occlusal plane inclination and mandibular deviation in facial esthetics, assessed by laypeople, dentists and orthodontists.Methods:A woman with 5.88° of inclination and 5.54 mm of mandibular deviation was selected and, based on her original photograph, four new images were created correcting the deviations and creating more symmetric faces and smiles. Examiners assessed the images by means of a questionnaire. Their opinions were compared by qualitative and quantitative analyses.Results:A total of 45 laypeople, 27 dentists and 31 orthodontists filled out the questionnaires. All groups were able to perceive the asymmetry; however, orthodontists were more sensitive, identifying asymmetries as from 4.32° of occlusal plane inclination and 4.155 mm of mandibular deviation (p< 0.05). The other categories of evaluators identified asymmetries and assigned significantly lower grades, starting from 5.88° of occlusal plane inclination and 5.54 mm of mandibular deviation (p< 0.05).Conclusion:Occlusal plane inclination and mandibular deviation were perceived by all groups, but orthodontists presented higher perception of deviations.
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Duong, Duc Long, Malitha Humayun Kabir y Rong Fu Kuo. "Automated caries detection with smartphone color photography using machine learning". Health Informatics Journal 27, n.º 2 (abril de 2021): 146045822110075. http://dx.doi.org/10.1177/14604582211007530.
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Untreated caries is significant problem that affected billion people over the world. Therefore, the appropriate method and accuracy of caries detection in clinical decision-making in dental practices as well as in oral epidemiology or caries research, are required urgently. The aim of this study was to introduce a computational algorithm that can automate recognize carious lesions on tooth occlusal surfaces in smartphone images according to International Caries Detection and Assessment System (ICDAS). From a group of extracted teeth, 620 unrestored molars/premolars were photographed using smartphone. The obtained images were evaluated for caries diagnosis with the ICDAS II codes, and were labeled into three classes: “No Surface Change” ( NSC); “Visually Non-Cavitated” ( VNC); “Cavitated” ( C). Then, a two steps detection scheme using Support Vector Machine (SVM) has been proposed: “ C versus (VNC + NSC)” classification, and “ VNC versus NSC” classification. The accuracy, sensitivity, and specificity of best model were 92.37%, 88.1%, and 96.6% for “ C versus (VNC + NSC),” whereas they were 83.33%, 82.2%, and 66.7% for “ VNC versus NSC.” Although the proposed SVM system required further improvement and verification, with the data only imaged from the smartphone, it performed an auspicious potential for clinical diagnostics with reasonable accuracy and minimal cost.
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El Bsat, Abdul Rehman, Elie Shammas, Daniel Asmar, George E. Sakr, Kinan G. Zeno, Anthony T. Macari y Joseph G. Ghafari. "Semantic Segmentation of Maxillary Teeth and Palatal Rugae in Two-Dimensional Images". Diagnostics 12, n.º 9 (8 de septiembre de 2022): 2176. http://dx.doi.org/10.3390/diagnostics12092176.
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The superimposition of sequential radiographs of the head is commonly used to determine the amount and direction of orthodontic tooth movement. A harmless method includes the timely unlimited superimposition on the relatively stable palatal rugae, but the method is performed manually and, if automated, relies on the best fit of surfaces, not only rugal structures. In the first step, motion estimation requires segmenting and detecting the location of teeth and rugae at any time during the orthodontic intervention. Aim: to develop a process of tooth segmentation that eliminates all manual steps to achieve an autonomous system of assessment of the dentition. Methods: A dataset of 797 occlusal views from photographs of teeth was created. The photographs were manually semantically segmented and labeled. Machine learning methods were applied to identify a robust deep network architecture able to semantically segment teeth in unseen photographs. Using well-defined metrics such as accuracy, precision, and the average mean intersection over union (mIoU), four network architectures were tested: MobileUnet, AdapNet, DenseNet, and SegNet. The robustness of the trained network was additionally tested on a set of 47 image pairs of patients before and after orthodontic treatment. Results: SegNet was the most accurate network, producing 95.19% accuracy and an average mIoU value of 86.66% for the main sample and 86.2% for pre- and post-treatment images. Conclusions: Four architectural tests were developed for automated individual teeth segmentation and detection in two-dimensional photos that required no post-processing. Accuracy and robustness were best achieved with SegNet. Further research should focus on clinical applications and 3D system development.
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Mitchell, JK, AR Furness, RJ Sword, SW Looney, WW Brackett y MG Brackett. "Diagnosis of Pit-and-fissure Caries Using Three-dimensional Scanned Images". Operative Dentistry 43, n.º 3 (1 de mayo de 2018): E152—E157. http://dx.doi.org/10.2341/17-076-l.
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SUMMARYDiagnosis of the extent of pit-and-fissure caries has been subjective and thus difficult to teach and categorize for treatment planning. This in vitro study compares occlusal caries diagnosis of extracted posterior teeth (n=49) using three-dimensional (3D) scanned images vs visual examination, according to the International Caries Detection and Assessment System (ICDAS). The surfaces chosen for study represent all ICDAS classifications. Five experienced restorative faculty members examined scanned images for 60 seconds from a standardized series of views of each surface and scored them independently. One month later, the same teeth were examined visually by the same five raters with magnification and LED headlamps, with compressed air available. Intrarater and interrater agreement and validity were assessed using intraclass correlation coefficients (ICCs). The ICCs, ranging from 0.90 to 0.93, indicated excellent agreement between and within raters and between the raters and the gold standard ICDAS determination. This suggests that both photographs and 3D scans of pits and fissures are equally effective in diagnosing caries.
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Ye, Sixian, Huangjun Zhou, Xingyu Lyu, Hao Feng, Min Liu y Cai Wen. "Should the vent hole of posterior implant crowns be placed on the lateral surface? An in vitro study of the hydrodynamic feature of cement extrusion and retention ability". PLOS ONE 17, n.º 10 (20 de octubre de 2022): e0276198. http://dx.doi.org/10.1371/journal.pone.0276198.
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Although placing a vent hole on the occlusal surface of the implant crown can reduce cervical marginal cement extrusion, it has disadvantages. Transferring the hole to the buccal or lingual surface of the posterior implant crown could therefore be an alternative solution. This study investigated the effect of transferring the vent hole to the lateral side of the implant posterior crown on the hydrodynamics of excess cement extrusion and the crown’s retention ability. Specially fabricated posterior implant crowns were divided into five groups: crowns with an occlusal hole (OH), occlusal lateral hole (OLH), middle lateral hole (MLH), cervical lateral hole (CLH), and no hole (NH). Each set of implant analog-abutment-crown specimens was wrapped in a polymethylacrylate base. The base of the implant crown was divided into four 90-degree quadrants along the diagonal of the square base with a pen mark. Cement was used to bond the crowns and the abutments, and the weight of cement extrusions at the vent holes and the abutment cervical margins were calculated. The distribution of cement extrusion at the margin was photographed in each quadrant, and the areas of surface coverage of cement extrusion were compared with ImageJ software. Retentive strength was measured as the dislocation force using a universal testing machine. One-way analysis of variance was used for result analysis. The cervical marginal cement extrusions of crowns with lateral holes (OLH, MLH, and CLH) were significantly less than that of NH crowns (P<0.05), but more than that of OH crowns (P<0.05). Subgroup analysis among the lateral hole groups indicated that the higher the position of the lateral hole, the lower the weight of the cement extrusion, and the smaller the total distribution area of cement extrusion. The cement extrusion distribution area was larger in the quadrant with the hole than in those opposite and next to the hole. Retention strength comparison indicated no significant difference between crowns with NH, OH, or lateral holes. Transferring the vent hole of the posterior implant crown to the lateral side could reduce cement extrusion at the cervical margin while reducing retention strength deterioration and the esthetic drawbacks caused by occlusal hole opening.
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Stolz, Sophie, François Lefebvre, Yves Bolender y Daniel Kanter. "Perception esthétique de la position verticale des bords libres des incisives latérales maxillaires dans l’arc du sourire". L'Orthodontie Française 88, n.º 3 (septiembre de 2017): 251–61. http://dx.doi.org/10.1051/orthodfr/2017018.
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Introduction : L’objectif de cette étude est d’évaluer la perception esthétique de différents niveaux verticaux des bords libres des incisives latérales maxillaires dans l’arc du sourire. Matériels et méthodes : Une photographie frontale du sourire d’une femme caucasienne a été altérée numériquement pour obtenir une image où les bords libres des incisives latérales maxillaires étaient symétriquement tangents à l’arc du sourire. Ces bords libres ont ensuite été déplacés verticalement par incréments de 0,5 mm. La valeur était considérée positive pour un déplacement en direction occlusale, négative en direction gingivale. Quatre autres images ont ainsi été obtenues en déplaçant les bords libres de +0,5 mm à -1,5 mm. Les cinq images ont été notées sur une échelle visuelle analogique par trois groupes d’évaluateurs : orthodontistes, chirurgiens-dentistes, profanes. Une analyse statistique des données a été réalisée. Résultats : Les profanes ont préféré, dans l’ordre, des incisives latérales tangentes à l’arc du sourire, un décalage de +0,5 mm et enfin un décalage de -0,5 mm. Les orthodontistes et les chirurgiens-dentistes ont préféré, dans l’ordre, un décalage de -0,5 mm, puis un décalage nul. Discussion : L’appréciation esthétique du sourire, concernant les rapports verticaux entre les bords libres des dents antérieures, diffère entre les profanes et les professionnels mais elle est similaire pour les orthodontistes et les chirurgiens-dentistes. La situation la plus consensuelle sur le plan esthétique, tant du point de vue des professionnels que de celui des profanes, est celle qui correspond aux bords libres des incisives latérales tangents à l’arc du sourire.
Tesis sobre el tema "Occlusal photographic images"
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BUTI, LAURA. "Nuove prospettive di indagine tassonomica di denti decidui usurati attraverso analisi di immagine e tecnologie tridimensionali". Doctoral thesis, 2013. http://hdl.handle.net/2158/799880.
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Despite the general increase in digital techniques for dental morphometric analyses, only a few methods are available to study worn teeth. Moreover, permanent dentitions are studied much more frequently than deciduous teeth. In this study we address both issues by providing a taxonomic classification of Neanderthal and modern human lower second deciduous molars (dm2s) through the analysis of crown and cervical outlines. Crown and cervical outlines were obtained from a three-dimensional (3D) digital sample of uniformly oriented dm2s. Both outlines were centered on the centroid of their area and represented by 16 pseudolandmarks obtained by equiangularly spaced radial vectors out of the centroid. We removed size information from the oriented and centered outlines with a uniform scaling of the pseudolandmark configurations to unit Centroid Size. Group shape variation was evaluated separately for the dm2 crown and cervical outlines through a shape –
space principal component analysis (PCA). Finally, quadratic discriminant analysis (QDA) of a subset of principal components was used to classify the specimens. In addition, we selected a further sample of modern dm2s and we compared both crown outlines detected from occlusal photographic images and the same profile obtained by 3D digital models in order to assess whether the two procedures provide consistent results.
Our results demonstrate that both cervical and crown outline successfully separate the two groups. Crown Outline properly discriminates the 92% of individuals while cervical outline allows 96% of correct attribution. Neanderthals showed a buccodistal expansion and convex lingual outline shape, whilst modern humans have buccodistal reduction and straight lingual outline shape. Therefore, we confirmed that the cervical outline represents an effective parameter for distinguishing between the two taxa when dealing with worn or damaged dm2s. Finally, the results achieved with the outlines digitized on photographic images are consistent with those obtained by using 3D models, which stands up for the reproducibility of the photographic protocol, faster and cheaper than the one based on the 3D digital models.
Actas de conferencias sobre el tema "Occlusal photographic images"
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Moutselos, Konstantinos, Elias Berdouses, Constantine Oulis y Ilias Maglogiannis. "Superpixel-Based Classification of Occlusal Caries Photography". En 2018 25th IEEE International Conference on Image Processing (ICIP). IEEE, 2018. http://dx.doi.org/10.1109/icip.2018.8451373.
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