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Boumbolo L, Dumont M, Brosset S, Bianchi J, Ruellas A, Gurgel M, Massaro C, Del Castillo AA, Ioshida M, Yatabe M, Benavides E, Rios H, Soki F, Neiva G, Paniagua B, Cevidanes L, Styner M, Prieto JC. FlyBy CNN: A 3D surface segmentation framework. Proc SPIE Int Soc Opt Eng 2021; 11596:115962B. [PMID: 33758460 PMCID: PMC7983301 DOI: 10.1117/12.2582205] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this paper, we present FlyBy CNN, a novel deep learning based approach for 3D shape segmentation. FlyByCNN consists of sampling the surface of the 3D object from different view points and extracting surface features such as the normal vectors. The generated 2D images are then analyzed via 2D convolutional neural networks such as RUNETs. We test our framework in a dental application for segmentation of intra-oral surfaces. The RUNET is trained for the segmentation task using image pairs of surface features and image labels as ground truth. The resulting labels from each segmented image are put back into the surface thanks to our sampling approach that generates 1-1 correspondence of image pixels and triangles in the surface model. The segmentation task achieved an accuracy of 0.9.
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Affiliation(s)
- Louis Boumbolo
- University of North Carolina, Chapel Hill, United States
| | | | | | | | | | | | | | | | | | | | - E Benavides
- University of Michigan, Ann Arbor, United States
| | - Hector Rios
- University of Michigan, Ann Arbor, United States
| | - Fabiana Soki
- University of Michigan, Ann Arbor, United States
| | - Gisele Neiva
- University of Michigan, Ann Arbor, United States
| | | | | | - Martin Styner
- University of North Carolina, Chapel Hill, United States
| | - Juan C Prieto
- University of North Carolina, Chapel Hill, United States
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2
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Betancourt P, Martínez-Diaz HC, Mora JG, Plaza-Rojas C, Olaya-M LA, Benavides E, Bolaños E, Hidalgo M. Seroprevalence against R. rickettsii, R. typhi and R. felis in human samples from prioritized rural areas in department of Cauca, Colombia. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.1411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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3
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Bianchi J, Gonçalves JR, de Oliveira Ruellas AC, Ashman LM, Vimort JB, Yatabe M, Paniagua B, Hernandez P, Benavides E, Soki FN, Ioshida M, Cevidanes LHS. Quantitative bone imaging biomarkers to diagnose temporomandibular joint osteoarthritis. Int J Oral Maxillofac Surg 2020; 50:227-235. [PMID: 32605824 DOI: 10.1016/j.ijom.2020.04.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 03/04/2020] [Accepted: 04/28/2020] [Indexed: 01/27/2023]
Abstract
Bone degradation of the condylar surface is seen in temporomandibular joint osteoarthritis (TMJ OA); however, the initial changes occur in the subchondral bone. This cross-sectional study was performed to evaluate 23 subchondral bone imaging biomarkers for TMJ OA. The sample consisted of high-resolution cone beam computed tomography scans of 84 subjects, divided into two groups: TMJ OA (45 patients with TMJ OA) and control (39 asymptomatic subjects). Six regions of each mandibular condyle scan were extracted for computation of five bone morphometric and 18 grey-level texture-based variables. The groups were compared using the Mann-Whitney U-test, and the receiver operating characteristics (ROC) curve was determined for each variable that showed a statically significance difference. The results showed statistically significant differences in the subchondral bone microstructure in the lateral and central condylar regions between the control and TMJ OA groups (P< 0.05). The area under the ROC curve (AUC) for these variables was between 0.620 and 0.710. In conclusion, 13 imaging bone biomarkers presented an acceptable diagnostic performance for the diagnosis of TMJ OA, indicating that the texture and geometry of the subchondral bone microarchitecture may be useful for quantitative grading of the disease.
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Affiliation(s)
- J Bianchi
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA; Department of Pediatric Dentistry, São Paulo State University (Unesp), School of Dentistry, Araraquara, Sao Paulo, Brazil.
| | - J R Gonçalves
- Department of Pediatric Dentistry, São Paulo State University (Unesp), School of Dentistry, Araraquara, Sao Paulo, Brazil
| | - A C de Oliveira Ruellas
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - L M Ashman
- Oral and Maxillofacial Surgery, Hospital Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - J-B Vimort
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA; Kitware, Inc., Carrboro, North Carolina, USA
| | - M Yatabe
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - B Paniagua
- Kitware, Inc., Carrboro, North Carolina, USA
| | - P Hernandez
- Kitware, Inc., Carrboro, North Carolina, USA
| | - E Benavides
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - F N Soki
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - M Ioshida
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - L H S Cevidanes
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
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Shoukri B, Prieto J, Ruellas A, Yatabe M, Sugai J, Styner M, Zhu H, Huang C, Paniagua B, Aronovich S, Ashman L, Benavides E, de Dumast P, Ribera N, Mirabel C, Michoud L, Allohaibi Z, Ioshida M, Bittencourt L, Fattori L, Gomes L, Cevidanes L. Minimally Invasive Approach for Diagnosing TMJ Osteoarthritis. J Dent Res 2019; 98:1103-1111. [PMID: 31340134 PMCID: PMC6704428 DOI: 10.1177/0022034519865187] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
This study's objectives were to test correlations among groups of biomarkers that are associated with condylar morphology and to apply artificial intelligence to test shape analysis features in a neural network (NN) to stage condylar morphology in temporomandibular joint osteoarthritis (TMJOA). Seventeen TMJOA patients (39.9 ± 11.7 y) experiencing signs and symptoms of the disease for less than 10 y and 17 age- and sex-matched control subjects (39.4 ± 15.2 y) completed a questionnaire, had a temporomandibular joint clinical exam, had blood and saliva samples drawn, and had high-resolution cone beam computed tomography scans taken. Serum and salivary levels of 17 inflammatory biomarkers were quantified using protein microarrays. A NN was trained with 259 other condyles to detect and classify the stage of TMJOA and then compared to repeated clinical experts' classifications. Levels of the salivary biomarkers MMP-3, VE-cadherin, 6Ckine, and PAI-1 were correlated to each other in TMJOA patients and were significantly correlated with condylar morphological variability on the posterior surface of the condyle. In serum, VE-cadherin and VEGF were correlated with one another and with significant morphological variability on the anterior surface of the condyle, while MMP-3 and CXCL16 presented statistically significant associations with variability on the anterior surface, lateral pole, and superior-posterior surface of the condyle. The range of mouth opening variables were the clinical markers with the most significant associations with morphological variability at the medial and lateral condylar poles. The repeated clinician consensus classification had 97.8% agreement on degree of degeneration within 1 group difference. Predictive analytics of the NN's staging of TMJOA compared to the repeated clinicians' consensus revealed 73.5% and 91.2% accuracy. This study demonstrated significant correlations among variations in protein expression levels, clinical symptoms, and condylar surface morphology. The results suggest that 3-dimensional variability in TMJOA condylar morphology can be comprehensively phenotyped by the NN.
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Affiliation(s)
- B. Shoukri
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - J.C. Prieto
- Department of Psychiatry, School of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - A. Ruellas
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M. Yatabe
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - J. Sugai
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M. Styner
- Department of Psychiatry, School of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - H. Zhu
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
| | - C. Huang
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
| | | | - S. Aronovich
- Department Oral and Maxillofacial Surgery and Hospital Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L. Ashman
- Department Oral and Maxillofacial Surgery and Hospital Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - E. Benavides
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - P. de Dumast
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - N.T. Ribera
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - C. Mirabel
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L. Michoud
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Z. Allohaibi
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M. Ioshida
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L. Bittencourt
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L. Fattori
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L.R. Gomes
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L. Cevidanes
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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Zupnik JT, Ioshida M, Yatabe M, Ruellas ACO, Gomes LR, Aronovich S, Benavides E, Edwards SP, Paniagua B, Cevidanes LHS. Three-dimensional analysis of condylar changes in surgical correction for open bite patients with skeletal class II and class III malocclusions. Int J Oral Maxillofac Surg 2019; 48:739-745. [PMID: 30712988 DOI: 10.1016/j.ijom.2019.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 11/20/2018] [Accepted: 01/08/2019] [Indexed: 11/17/2022]
Abstract
The aim of this study was to quantify three-dimensional condylar displacements as a result of two-jaw surgery for open bite correction in patients with skeletal class II and class III malocclusion. Pre-surgical (T1) and post-surgical (T2) cone beam computed tomography scans were taken for 16 patients with skeletal class II (mean age 22.3±9.47years) and 14 patients with skeletal class III (mean age 25.6±6.27years). T2 scans were registered to T1 scans at the cranial base. Translational and rotational condylar changes were calculated by x,y,z coordinates of corresponding landmarks. The directions and amounts of condylar displacement were assessed by intra- and inter-class Mann-Whitney U-test or t-test. Class II patients presented significantly greater amounts of lateral (P=0.002) and inferior (P=0.038) translation than class III patients. The magnitudes of condylar translational displacements were small for both groups. Skeletal class III patients had predominantly medial (P=0.024) and superior (P=0.047) condylar translation. Skeletal class II patients presented greater condylar counterclockwise pitch (P=0.007) than class III patients. Two-jaw surgery for the correction of open bite led to different directions and amounts of condylar rotational displacement in patients with skeletal class II compared to class III malocclusion, with greater rotational than translational displacements.
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Affiliation(s)
- J T Zupnik
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M Ioshida
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M Yatabe
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA.
| | - A C O Ruellas
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - L R Gomes
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - S Aronovich
- Department of Oral and Maxillofacial Surgery, University of Michigan, Ann Arbor, MI, USA
| | - E Benavides
- Department of Periodontics and Oral Medicine, University of Michigan, Ann Arbor, MI, USA
| | - S P Edwards
- Department of Oral and Maxillofacial Surgery, University of Michigan, Ann Arbor, MI, USA
| | | | - L H S Cevidanes
- Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA
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Ludlow JB, Timothy R, Walker C, Hunter R, Benavides E, Samuelson DB. Correction to Effective dose of dental CBCT--a meta analysis of published data and additional data for nine CBCT units. Dentomaxillofac Radiol 2015; 44:20159003. [PMID: 25874892 DOI: 10.1259/dmfr.20159003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Ludlow JB, Timothy R, Walker C, Hunter R, Benavides E, Samuelson DB, Scheske MJ. Effective dose of dental CBCT-a meta analysis of published data and additional data for nine CBCT units. Dentomaxillofac Radiol 2015; 44:20140197. [PMID: 25224586 DOI: 10.1259/dmfr.20140197] [Citation(s) in RCA: 245] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVES This article analyses dose measurement and effective dose estimation of dental CBCT examinations. Challenges to accurate calculation of dose are discussed and the use of dose-height product (DHP) as an alternative to dose-area product (DAP) is explored. METHODS The English literature on effective dose was reviewed. Data from these studies together with additional data for nine CBCT units were analysed. Descriptive statistics, ANOVA and paired analysis are used to characterize the data. RESULTS PubMed and EMBASE searches yielded 519 and 743 publications, respectively, which were reduced to 20 following review. Reported adult effective doses for any protocol ranged from 46 to 1073 µSv for large fields of view (FOVs), 9-560 µSv for medium FOVs and 5-652 µSv for small FOVs. Child effective doses from any protocol ranged from 13 to 769 µSv for large or medium FOVs and 7-521 µSv for small FOVs. Effective doses from standard or default exposure protocols were available for 167 adult and 52 child exposures. Mean adult effective doses grouped by FOV size were 212 µSv (large), 177 µSv (medium) and 84 µSv (small). Mean child doses were 175 µSv (combined large and medium) and 103 µSv (small). Large differences were seen between different CBCT units. Additional low-dose and high-definition protocols available for many units extend the range of doses. DHP was found to reduce average absolute error for calculation of dose by 45% in comparison with DAP. CONCLUSIONS Large exposure ranges make CBCT doses difficult to generalize. Use of DHP as a metric for estimating effective dose warrants further investigation.
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Affiliation(s)
- J B Ludlow
- 1 North Carolina Oral Health Institute, Koury Oral Health Sciences, Chapel Hill, NC, USA
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Cevidanes LHS, Walker D, Schilling J, Sugai J, Giannobile W, Paniagua B, Benavides E, Zhu H, Marron JS, Jung BT, Baranowski D, Rhodes J, Nackley A, Lim PF, Ludlow JB, Nguyen T, Goncalves JR, Wolford L, Kapila S, Styner M. 3D osteoarthritic changes in TMJ condylar morphology correlates with specific systemic and local biomarkers of disease. Osteoarthritis Cartilage 2014; 22:1657-67. [PMID: 25278075 PMCID: PMC4185299 DOI: 10.1016/j.joca.2014.06.014] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 06/01/2014] [Accepted: 06/13/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To assess 3D morphological variations and local and systemic biomarker profiles in subjects with a diagnosis of temporomandibular joint osteoarthritis (TMJ OA). DESIGN Twenty-eight patients with long-term TMJ OA (39.9 ± 16 years), 12 patients at initial diagnosis of OA (47.4 ± 16.1 years), and 12 healthy controls (41.8 ± 12.2 years) were recruited. All patients were female and had cone beam CT scans taken. TMJ arthrocentesis and venipuncture were performed on 12 OA and 12 age-matched healthy controls. Serum and synovial fluid levels of 50 biomarkers of arthritic inflammation were quantified by protein microarrays. Shape Analysis MANCOVA tested statistical correlations between biomarker levels and variations in condylar morphology. RESULTS Compared with healthy controls, the OA average condyle was significantly smaller in all dimensions except its anterior surface, with areas indicative of bone resorption along the articular surface, particularly in the lateral pole. Synovial fluid levels of ANG, GDF15, TIMP-1, CXCL16, MMP-3 and MMP-7 were significantly correlated with bone apposition of the condylar anterior surface. Serum levels of ENA-78, MMP-3, PAI-1, VE-Cadherin, VEGF, GM-CSF, TGFβb1, IFNγg, TNFαa, IL-1αa, and IL-6 were significantly correlated with flattening of the lateral pole. Expression levels of ANG were significantly correlated with the articular morphology in healthy controls. CONCLUSIONS Bone resorption at the articular surface, particularly at the lateral pole was statistically significant at initial diagnosis of TMJ OA. Synovial fluid levels of ANG, GDF15, TIMP-1, CXCL16, MMP-3 and MMP-7 were correlated with bone apposition. Serum levels of ENA-78, MMP-3, PAI-1, VE-Cadherin, VEGF, GM-CSF, TGFβ1, IFNγ, TNFα, IL-1α, and IL-6 were correlated with bone resorption.
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Affiliation(s)
- L H S Cevidanes
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
| | - D Walker
- Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - J Schilling
- Department of Periodontics and Oral Medicine School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - J Sugai
- Department of Periodontics and Oral Medicine School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - W Giannobile
- Department of Periodontics and Oral Medicine School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - B Paniagua
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA
| | - E Benavides
- Department of Periodontics and Oral Medicine School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - H Zhu
- Department of Statistics, University of North Carolina, Chapel Hill, NC, USA
| | - J S Marron
- Department of Statistics, University of North Carolina, Chapel Hill, NC, USA
| | - B T Jung
- Department of Statistics, University of North Carolina, Chapel Hill, NC, USA
| | - D Baranowski
- Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - J Rhodes
- Department of Endodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - A Nackley
- Department of Endodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - P F Lim
- Department of Endodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - J B Ludlow
- Department of Diagnostic Sciences, University of North Carolina, Chapel Hill, NC, USA
| | - T Nguyen
- Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - J R Goncalves
- Department of Pediatric Dentistry, State University of Sao Paulo, Araraquara, Brazil
| | - L Wolford
- Department of Oral Maxillofacial Surgery, Baylor College of Dentistry, Dallas, TX, USA
| | - S Kapila
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - M Styner
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA
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Schilling J, Gomes LCR, Benavides E, Nguyen T, Paniagua B, Styner M, Boen V, Gonçalves JR, Cevidanes LHS. Regional 3D superimposition to assess temporomandibular joint condylar morphology. Dentomaxillofac Radiol 2013; 43:20130273. [PMID: 24170802 DOI: 10.1259/dmfr.20130273] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To investigate the reliability of regional three-dimensional registration and superimposition methods for assessment of temporomandibular joint condylar morphology across subjects and longitudinally. METHODS The sample consisted of cone beam CT scans of 36 patients. The across-subject comparisons included 12 controls, mean age 41.3 ± 12.0 years, and 12 patients with temporomandibular joint osteoarthritis, mean age 41.3 ± 14.7 years. The individual longitudinal assessments included 12 patients with temporomandibular joint osteoarthritis, mean age 37.8 ± 16.7 years, followed up at pre-operative jaw surgery, immediately after and one-year post-operative. Surface models of all condyles were constructed from the cone beam CT scans. Two previously calibrated observers independently performed all registration methods. A landmark-based approach was used for the registration of across-subject condylar models, and temporomandibular joint osteoarthritis vs control group differences were computed with shape analysis. A voxel-based approach was used for registration of longitudinal scans calculated x, y, z degrees of freedom for translation and rotation. Two-way random intraclass correlation coefficients tested the interobserver reliability. RESULTS Statistically significant differences between the control group and the osteoarthritis group were consistently located on the lateral and medial poles for both observers. The interobserver differences were ≤0.2 mm. For individual longitudinal comparisons, the mean interobserver differences were ≤0.6 mm in translation errors and 1.2° in rotation errors, with excellent reliability (intraclass correlation coefficient >0.75). CONCLUSIONS Condylar registration for across-subjects and longitudinal assessments is reliable and can be used to quantify subtle bony differences in the three-dimensional condylar morphology.
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Affiliation(s)
- J Schilling
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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Quintana C, Galleguillos L, Benavides E, Quintana JC, Zúñiga A, Duarte I, Klaassen J, Kolbach M, Soto RM, Iacobelli S, Alvarez M, O'Brien A. Clinical diagnostic clues in Crohn's disease: a 41-year experience. ISRN Gastroenterol 2012; 2012:285475. [PMID: 23213555 PMCID: PMC3506886 DOI: 10.5402/2012/285475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 09/23/2012] [Indexed: 01/18/2023]
Abstract
Determining the diagnosis of Crohn's disease has been highly difficult mainly during the first years of this study carried out at the Pontificia Universidad Catolica (PUC) Clinical Hospital. For instance, it has been frequently confused with Irritable bowel syndrome and sometimes misdiagnosed as ulcerative colitis, infectious colitis or enterocolitis, intestinal lymphoma, or coeliac disease. Consequently, it seems advisable to characterize what the most relevant clinical features are, in order to establish a clear concept of Crohn's disease. This difficulty may still be a problem at other medical centers in developing countries. Thus, sharing this information may contribute to a better understanding of this disease. Based on the clinical experience gained between 1963 and 2004 and reported herein, the main clinical characteristics of the disease are long-lasting day and night abdominal pain, which becomes more intense after eating and diarrhoea, sometimes associated to a mass in the abdomen, anal lesions, and other additional digestive and nondigestive clinical features. Nevertheless, the main aim of this work has been the following: is it possible to make, in an early stage, the diagnosis of Crohn's disease with a high degree of certainty exclusively with clinical data?
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Affiliation(s)
- C Quintana
- Facultad de Medicina, Pontificia Universidad Catolica de Chile, 8330024 Santiago, Chile ; Facultad de Medicina, Universidad de los Andes, 7620001 Santiago, Chile
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Bashutski JD, Eber RM, Kinney JS, Benavides E, Maitra S, Braun TM, Giannobile WV, McCauley LK. The impact of vitamin D status on periodontal surgery outcomes. J Dent Res 2011; 90:1007-12. [PMID: 21555774 DOI: 10.1177/0022034511407771] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Vitamin D regulates calcium and immune function. While vitamin D deficiency has been associated with periodontitis, little information exists regarding its effect on wound healing and periodontal surgery outcomes. This longitudinal clinical trial assessed outcomes of periodontal surgery and teriparatide administration in vitamin-D-sufficient and -insufficient individuals. Forty individuals with severe chronic periodontitis received periodontal surgery, daily calcium and vitamin D supplements, and self-administered teriparatide or placebo for 6 wks to correspond with osseous healing time. Serum 25(OH)D was evaluated at baseline, 6 wks, and 6 mos post-surgery. Clinical and radiographic outcomes were evaluated over 1 yr. Placebo patients with baseline vitamin D deficiency [serum 25(OH)D, 16-19 ng/mL] had significantly less clinical attachment loss (CAL) gain (-0.43 mm vs. 0.92 mm, p < 0.01) and probing depth (PPD) reduction (0.43 mm vs. 1.83 mm, p < 0.01) than vitamin-D-sufficient individuals. Vitamin D levels had no significant impact on CAL and PPD improvements in teriparatide patients at 1 yr, but infrabony defect resolution was greater in teriparatide-treated vitamin-D-sufficient vs. -deficient individuals (2.05 mm vs. 0.87 mm, p = 0.03). Vitamin D deficiency at the time of periodontal surgery negatively affects treatment outcomes for up to 1 yr. Analysis of these data suggests that vitamin D status may be critical for post-surgical healing. (ClinicalTrials.gov number, CT00277706).
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Affiliation(s)
- J D Bashutski
- Department of Periodontics and Oral Medicine, Michigan Center for Oral Health Research, School of Dentistry, University of Michigan, 1011 N. University Ave., Room 3349, Ann Arbor, MI 48109, USA.
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Benavides E, Florea D, Salas S, Avendaño L, Montero A, Aguayo M. 237 CPAP USE IN 107 PATIENTS WITH MODERATE SYMPTOMATIC AND SEVERE SLEEP APNEA/HYPOPNOEA SYNDROME: A SIX-MONTH FOLLOW-UP. Sleep Med 2009. [DOI: 10.1016/s1389-9457(09)70239-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Benavides E, Bilgen M, Al-Hafez B, Alrefae T, Wang Y, Spencer P. High-resolution magnetic resonance imaging and diffusion tensor imaging of the porcine temporomandibular joint disc. Dentomaxillofac Radiol 2009; 38:148-55. [DOI: 10.1259/dmfr/19195745] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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Benavides E, Ortiz JC, Sites JW. SPECIES BOUNDARIES AMONG THE TELMATOBIUS (ANURA: LEPTODACTYLIDAE) OF THE LAKE TITICACA BASIN: ALLOZYME AND MORPHOLOGICAL EVIDENCE. HERPETOLOGICA 2002. [DOI: 10.1655/0018-0831(2002)058[0031:sbatta]2.0.co;2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Benavides E, Ortiz D, Benavides J. Association of botulism and tetanus as causative agents of an outbreak of bovine paraplegic mortality in the eastern plains of Colombia. Ann N Y Acad Sci 2001; 916:646-9. [PMID: 11193691 DOI: 10.1111/j.1749-6632.2000.tb05352.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E Benavides
- Programa Nacional de Epidemiología Veterinaria (EpiVet), Corporación Colombiana de Investigación Agropecuaria, CORPOICA-CEISA, Santafé de Bogotá, Colombia.
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Benavides E, Rodríguez JL, Romero A. Isolation and partial characterization of the Montecitos strain of Boophilus microplus (Canestrini, 1877) multiresistant to different acaricides. Ann N Y Acad Sci 2001; 916:668-71. [PMID: 11193697 DOI: 10.1111/j.1749-6632.2000.tb05358.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E Benavides
- Programa Nacional de Epidemiología Veterinaria (EpiVet), Corporación Colombiana de Investigación Agropecuaria, CORPOICA-CEISA, Santafé de Bogotá, Colombia.
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Affiliation(s)
- E Benavides
- Programa Nacional de Epidemiología Veterinaria (EpiVet), Corporación Colombiana de Investigación Agropecuaria, CORPOICA-CEISA, Santafé de Bogotá, Colombia.
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Affiliation(s)
- E Benavides
- Programa Nacional de Epidemiología Veterinaria (EpiVet), Corporación Colombiana de Investigación Agropecuaria, CORPOICA-CEISA, Santafé de Bogotá, Colombia.
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Escamilla MA, DeMille MC, Benavides E, Roche E, Almasy L, Pittman S, Hauser J, Lew DF, Freimer NB, Whittle MR. A minimalist approach to gene mapping: locating the gene for acheiropodia, by homozygosity analysis. Am J Hum Genet 2000; 66:1995-2000. [PMID: 10780921 PMCID: PMC1378047 DOI: 10.1086/302921] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2000] [Accepted: 03/24/2000] [Indexed: 11/03/2022] Open
Abstract
Acheiropodia is an autosomal recessive disease that results in hemimelia (lack of formation of the distal extremities). We performed a complete genome screen of seven members of an extended pedigree that included three siblings with acheiropodia. Homozygosity mapping was used to identify regions most likely to harbor the gene for acheiropodia in this pedigree. In these two key regions (14p and 7q), further genotyping of one additional affected member of this pedigree plus seven additional unaffected siblings provided evidence, through linkage analysis, that the 7q36 region contains the acheiropodia gene. In this region, a maximum two-point LOD score of 3.81 (4.2 with multipoint analysis) was achieved, and a homozygous haplotype spanning a region of 11.7 cM was seen in all affected in this pedigree. Finally, genotypic analysis of two additional cases of acheiropodia with no known relation to the other samples revealed homozygous sharing of a portion of the same haplotype on 7q36, which reduces the chromosomal location of the acheiropodia gene to an 8.6-cM region. Localization of this gene, at the screening level, by use of data from only three affected subjects, provides an example of how certain genes may be mapped by use of a minimal number of affected cases.
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Affiliation(s)
- M A Escamilla
- Neurogenetics Laboratory, Department of Psychiatry, University of Texas Health Science Center, San Antonio, TX, USA.
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Benavides E, Alvarez J. Peripheral axons of Wlds mice, which regenerate after a delay of several weeks, do so readily when transcription is inhibited in the distal stump. Neurosci Lett 1998; 258:77-80. [PMID: 9875531 DOI: 10.1016/s0304-3940(98)00746-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We have raised the hypothesis that differentiated Schwann cells repress regrowth of axons but become permissive upon dedifferentiation. WId(S) mouse is a strain in which severed peripheral nerves do not degenerate for several weeks, and axonal regeneration does not occur either [5,11]. In this strain, we studied the role of resident cells upon axonal regeneration by inhibiting transcription. Regeneration was assessed with the pinch test, electron microscopy and Dil (a fluorescent lipid soluble dye). After a crush, WId(S) axons did not regenerate but they did so when the crush was made through a nerve segment treated with actinomycin D (ActD), an inhibitor of transcription. In contrast, when the crush was made distal to the treated segment no regeneration ensued. Our results support the notion that normal resident cells of peripheral nerves repress axonal growth.
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Affiliation(s)
- E Benavides
- Unidad de Neurobiología Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica, Casilla, Santiago, Chile
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Benavides E, Wulf A, Rahmer A, Zúñiga A, Aguayo G, Oyarzún E, Quintana C. [Ulcerative colitis and pregnancy]. Rev Med Chil 1998; 126:363-6. [PMID: 9699365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND The evolution of ulcerative colitis in pregnancy is far from clear. While some authors state that the disease aggravates during this period, others do not share this opinion. AIM To assess the evolution of ulcerative colitis in pregnancy. PATIENTS AND METHODS A paired case-control design was used in which 15 women, with diagnosed ulcerative colitis at the moment of becoming pregnant, were followed for 12 months and the activity of the disease was compared with that of the 12 months preceding the pregnancy. The activity of the disease in the period preceding the pregnancy was gathered retrospectively from the patient's charts. RESULTS The mean age of the first ulcerative colitis crisis was 24 years. It was moderate in 49% and severe in 35% of women. During pregnancy 55% of women did not have a crisis, compared with 26.7% during the period preceding pregnancy (relative risk of not having a crisis during pregnancy of 1.7). During both periods, seven women had digestive complications, whereas extra digestive complications were not observed in 60% of patients during pregnancy and 11.8% of patients during the preceding period. Perinatal results were similar to those of the general population. CONCLUSIONS In our group of patients the evolution of ulcerative colitis was better during pregnancy, reflected by a lower number of crisis.
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Affiliation(s)
- E Benavides
- Departamento de Gastroenterología, Hospital Clínico Pontificia Universidad Católica de Chile, Santiago, Chile
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Bedregal P, Romero MI, Bastías G, Castillo J, Pinto JI, Benavides E. [Mortality due to traffic accidents in Chile, 1994: an epidemiological approach]. Rev Med Chil 1997; 125:1097-102. [PMID: 9595803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Traffic accidents are one of the most important public health problems in the world and produce social, work and human resources losses. AIM To perform an epidemiological description of traffic accidents occurred in Chile during 1994. MATERIAL AND METHODS Data were obtained from death certificates in which the cause of death was a traffic accident. All death certificates obtained by the National Institute of Statistics during 1994 were used. Social, demographic and seasonal variables were recorded. RESULTS During 1994, there were 1679 deaths due to traffic accidents (81% male), with a rate of 19.6 per 100,000 inhabitants. Gender specific risks were 19.62 and 4.48 for men and women, respectively. Mean age at the moment of death was 39 years old. Fifty three percent of deceased people were single, 42% married and 5% widowers. Ten percent had no formal education, 48% had basic education, 23% college education and 6.5% university education. Seventy seven percent of fatalities occurred in urban areas. The risk of death by traffic accidents was 7.02 per 100,000 inhabitants in the metropolitan region. CONCLUSIONS The information obtained in the present study may help to generate preventive strategies to control deaths caused by traffic accidents.
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Affiliation(s)
- P Bedregal
- Departamento de Salud Pública, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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Stern MP, Duggirala R, Mitchell BD, Reinhart LJ, Shivakumar S, Shipman PA, Uresandi OC, Benavides E, Blangero J, O'Connell P. Evidence for linkage of regions on chromosomes 6 and 11 to plasma glucose concentrations in Mexican Americans. Genome Res 1996; 6:724-34. [PMID: 8858347 DOI: 10.1101/gr.6.8.724] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The genetic factors involved in type II diabetes are still unknown. To address this problem, we are creating a 10 to 15 cM genetic map on 444 individuals from 32 Mexican American families ascertained on a type II diabetic proband. Using highly polymorphic microsatellite markers and a multipoint variance components method, we found evidence for linkage of plasma glucose concentration 2 hr after oral glucose administration to two regions on chromosome 11: beta-hemoglobin (HBB) and markers D11S899/D11S1324 near the sulfonylurea receptor (SUR) gene. Iod scores at these two loci were 2.77 and 3.37, respectively. The SUR gene region accounted for 44.7% of the phenotypic variance. Evidence for linkage to fasting glucose concentration was also observed for two loci on chromosome 6, one of which is identical to a proposed susceptibility locus for type I diabetes (D6S290). When diabetics were excluded from the analyses, all Iod scores became zero, suggesting that the observed linkages were with the trait diabetes rather than with normal variation in glucose levels. Results were similar whether all diabetics were included in the analyses or only those who were not under treatment with oral antidiabetic agents or insulin.
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Affiliation(s)
- M P Stern
- Department of Medicine, University of Texas Health Science Center, San Antonio 78284, USA.
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Kroll J, Carey K, Hagedorn D, Dog PF, Benavides E. A survey of homeless adults in urban emergency shelters. Hosp Community Psychiatry 1986; 37:283-6. [PMID: 3957275 DOI: 10.1176/ps.37.3.283] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Following a review of several studies of homeless populations, the authors describe a survey of 68 homeless adults in eight urban emergency shelters in Hennepin County, Minnesota. The results indicated impressive rates of mental illness, alcoholism, minor criminality, and chronic medical and dental problems. More significant, the authors believe, both for the homeless and for public policy planners, is that a majority of the interviewees were disconnected from supportive social networks and were underutilizing medical and welfare programs for which they were eligible. Almost 40 percent of those with chronic health problems were receiving no medical care, and only 6 percent were receiving mental health services, although more than 50 percent needed such care. The authors compare the findings with those of studies discussed in the literature review.
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Aycardi E, Benavides E, Garcia O, Mateus G, Henao F, Zuluaga FN. Boophilus microplus tick burdens on grazing cattle in Colombia. Trop Anim Health Prod 1984; 16:78-84. [PMID: 6485100 DOI: 10.1007/bf02239849] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
This study was conducted at Carimagua Research Centre in a well-drained savanna area in the eastern plains of Colombia. The objectives were to note the effect of ecological factors on tick burdens, principally the effect of the environment given by four grasses on the seasonal variations of tick populations. Adult female tick counts were carried out on heifers grazing four pastures and tick larvae on the grass detected by cloth dragging. Tick counts were significantly higher on animals grazing Brachiaria decumbens than those grazing Andropogon gayanus, Melinis minutiflora or native pastures. Tick larvae counts on the grass showed a similar tendency. Introduced grasses and intensification of production will require greater care to control tick infestations since increases in stocking rate and ground coverage could augment tick populations.
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Myers SA, Benavides E, Alrenga DP, Freese U. Ovarian abscess in mid-trimester. Colo Med 1980; 77:133-4. [PMID: 7363576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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