Read by QxMD icon Read

Fractal panoramic

Ismail Gumussoy, Ozkan Miloglu, Erdem Cankaya, Ibrahim S Bayrakdar
OBJECTIVES: The purpose of this study was to evaluate fractal analysis as a tool to quantitatively determine the mandibular trabecular bone changes in patients with chronic renal failure (CRF). METHODS: In the present study, fractal analysis was performed using ImageJ (National Institutes of Health, Bethesda, MD) program with box-counting method over panoramic radiographs of 25 patients (14 females and 11 males) with CRF and 26 healthy individuals (14 females and 12 males) as a control group...
2016: Dento Maxillo Facial Radiology
Ana C Apolinário, Rafael Sindeaux, Paulo T de Souza Figueiredo, Ana T B Guimarães, Ana C Acevedo, Luiz C Castro, Ana P de Paula, Lilian M de Paula, Nilce S de Melo, André F Leite
OBJECTIVES: To verify radiomorphometric indices and fractal dimension (FD) in dental panoramic radiographs (DPRs) of children with different types of osteogenesis imperfecta (OI) and also to verify the effect of pamidronate (PAM) treatment in such panoramic analyses. METHODS: In this retrospective study, 197 DPRs of 62 children with OI Types I, III and IV who were in treatment with a comparable dosage of intravenous PAM were selected. The mandibular cortical width (MCW), mandibular cortical index, visual estimation of the cortical width and FD of three standardized trabecular and cortical mandibular regions of interest were obtained from the radiographs...
2016: Dento Maxillo Facial Radiology
Berkay Tolga Suer, Zekai Yaman, Bora Buyuksarac
PURPOSE: Fractal analysis is a mathematical method used to describe the internal architecture of complex structures such as trabecular bone. Fractal analysis of panoramic radiographs of implant recipient sites could help to predict the quality of the bone prior to implant placement. This study investigated the correlations between the fractal dimension values obtained from panoramic radiographs and the insertion torque and resonance frequency values of mandibular implants. MATERIALS AND METHODS: Thirty patients who received a total of 55 implants of the same brand, diameter, and length in the mandibular premolar and molar regions were included in the study...
January 2016: International Journal of Oral & Maxillofacial Implants
Rafael Scaf de Molon, Wagner Nunes de Paula, Rubens Spin-Neto, Mario Henrique Arruda Verzola, Guilherme Monteiro Tosoni, Raphael Carlos Comelli Lia, Gulnara Scaf, Elcio Marcantonio
The aim of this study was to determine the pattern of bone remodeling after maxillary sinus lifting in humans by means of fractal dimension (FD) and histomorphometric analysis. Therefore, the correlation between FD and the histomorphometric findings was evaluated. Sixteen patients with posterior edentulous maxilla were enrolled in this study. Maxillary sinus lifting was performed using autogenous bone grafted from the mandibular retromolar area. Three direct digital panoramic radiographs were obtained: before surgery (Group 1), immediately postoperatively (Group 2) and after 6 months of healing (Group 3) for FD analysis...
January 2015: Brazilian Dental Journal
Muthu Subash Kavitha, Seo-Young An, Chang-Hyeon An, Kyung-Hoe Huh, Won-Jin Yi, Min-Suk Heo, Sam-Sun Lee, Soon-Chul Choi
OBJECTIVE: To determine whether individual measurements or a combination of textural features and mandibular cortical width (MCW) derived from digital dental panoramic radiographs (DPRs) are more useful in assessment of osteoporosis. STUDY DESIGN: Textural features were obtained by using fractal dimension (FD) and gray-level co-occurrence matrix (GLCM). Digital DPRs and bone mineral densities (BMDs) of the lumbar spine and the femoral neck were obtained from 141 female patients...
March 2015: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Mert Zeytinoğlu, Betül İlhan, Nesrin Dündar, Hayal Boyacioğlu
OBJECTIVES: There is no consensus on the relationship between fractal dimension and trabecular bone complexity. Our aims were to examine the changes in fractal dimension (FD) from peri-implant alveolar bone on digital panoramic radiographs 6 and 12 months after prosthodontic loading and to compare these with baseline values calculated just after loading. MATERIAL AND METHODS: Three panoramic radiographs taken from 76 implant patients taken (1) after prosthodontic loading (3 months ± 2 weeks after insertion = baseline), (2) 6 months ± 2 weeks after loading, and (3) 12 months ±2 weeks after loading were considered for the study...
March 2015: Clinical Oral Investigations
Rafael Sindeaux, Paulo Tadeu de Souza Figueiredo, Nilce Santos de Melo, Ana Tereza Bittencourt Guimarães, Leonardo Lazarte, Fernando Borges Pereira, Ana Patrícia de Paula, André Ferreira Leite
OBJECTIVE: To verify whether fractal dimensions (FD) on the mandibular trabecular and cortical bone and mandibular cortical width (MCW) differ between patients with normal bone mineral density (BMD) and osteoporosis. STUDY DESIGN: In this retrospective study, 133 dental panoramic radiographs from men aged >60 years and postmenopausal women with a bone densitometry report of the lumbar spine and hip classified as either normal or osteoporotic were selected. Fractal dimensions of five standardized trabecular and cortical mandibular regions of interest and mandibular cortical width were measured on the panoramic radiographs by an experienced oral radiologist, blinded to the densitometric diagnosis...
February 2014: Maturitas
Martin G Roberts, James Graham, Hugh Devlin
Previous studies have shown an association between osteoporosis and automatic measurements of mandibular cortical width on dental panoramic radiographs (DPRs). In this study, we show that additional image texture features increase this association and propose the combined features as a potential biomarker for osteoporosis. We used an existing dataset of 663 DPRs of female patients with bone mineral density (BMD) measurements. The mandibular cortex was located using a previously described computer algorithm...
September 2013: IEEE Transactions on Bio-medical Engineering
Kwang-Joon Koh, Ha-Na Park, Kyoung-A Kim
PURPOSE: This study was performed to evaluate the trabecular pattern on panoramic radiographs to predict age-related osteoporosis in postmenopausal women. MATERIALS AND METHODS: Thirty-one postmenopausal osteoporotic women and 25 postmenopausal healthy women between the ages of 50 and 88 were enrolled in this study. The bone mineral density (BMD) of the lumbar vertebrae and femur were calculated using dual-energy X-ray absorptiometry (DXA), and panoramic radiographs were obtained...
December 2012: Imaging Science in Dentistry
Matheus Lima Oliveira, Esio Fortaleza Nascimento Chaves Pedrosa, Adriana Dibo Cruz, Francsico Haiter-Neto, Francisco Jose Albuquerque Paula, Plauto Christopher Aranha Watanabe
OBJECTIVES: The aim of this study is to evaluate the relative efficacy of the mandibular trabecular bone in detecting osteoporotic-associated bone changes in Brazilian women. MATERIALS AND METHODS: Seventy-three digital panoramic radiographs of healthy and osteoporotic postmenopausal women were used. Regions of interest were selected in the mandibular angle and body of the panoramic images, which were analyzed for fractal dimension (FD) and pixel intensity (PI)...
November 2013: Clinical Oral Investigations
Erinç Önem, B Güniz Baksı, Elif Sogur
PURPOSE: To evaluate the combination of fractal dimension (FD), lacunarity, and Feret diameter (FeD) to quantitatively characterize structural changes of mandibular alveolar bone around dental implants during initial healing. MATERIALS AND METHODS: Three standard-sized regions of interest (ROIs) (mesial and distal crest and apical area) around implants and three ROIs of the same size in the alveolar bone on the contralateral side were analyzed on digital panoramic images...
September 2012: International Journal of Oral & Maxillofacial Implants
Füsun Yasar, Burcu Apaydin, Hasan-Hüseyin Yilmaz
OBJECTIVES: The aims of this study were to explore how image compression affects density, fractal dimension, linear and angular measurements on digital panoramic images and assess inter and intra-observer repeatability of these measurements. STUDY DESIGN: Sixty-one digital panoramic images in TIFF format (Tagged Image File Format) were compressed to JPEG (Joint Photographic Experts Group) images. Two observers measured gonial angle, antegonial angle, mandibular cortical width, coronal pulp width of maxillary and mandibular first molar, tooth length of maxillary and mandibular first molar on the left side of these images twice...
November 2012: Medicina Oral, Patología Oral y Cirugía Bucal
A C Alman, L R Johnson, D C Calverley, G K Grunwald, D C Lezotte, J E Hokanson
UNLABELLED: Dental panoramic radiographs could be used to screen for osteopenia. We found the fractal dimension to be a good discriminator of osteopenia in both men and women but that the mandibular cortical width (MCW) did not perform as well in men. The fractal dimension may be a valid screening tool. INTRODUCTION: The aim of this study was to assess the diagnostic capability of the fractal dimension and MCW measured from dental panoramic radiographs in identifying men and women with decreased bone mineral density (BMD)...
May 2012: Osteoporosis International
Dae-Hyun Lee, Young Ku, In-Chul Rhyu, Jeong-Ug Hong, Cheol-Woo Lee, Min-Suk Heo, Kyung-Hoe Huh
PURPOSE: It has been suggested that primary implant stability plays an essential role in successful osseointegration. Resonance frequency analysis (RFA) is widely used to measure the initial stability of implants because it provides superior reproducibility and non-invasiveness. The purpose of this study is to investigate whether the fractal dimension from the panoramic radiograph is related to the primary stability of the implant as represented by RFA. METHODS: This study included 22 patients who underwent dental implant installation at the Department of Periodontology of Seoul National University Dental Hospital...
February 2010: Journal of Periodontal & Implant Science
Marijn Créton, Wil Geraets, Jan Willem Verhoeven, Paul F van der Stelt, Hans Verhey, Marco Cune
PURPOSE: Radiographic parameters of mandibular trabecular bone structure between 67 subjects having hypodontia and those without were studied on digital panoramic radiographs. MATERIALS AND METHODS: Three regions of interest (ROI) were defined: the ascending ramus, apical of the mandibular molar and mesial of the first mandibular molar. The effects of the presence of hypodontia and the ROI on the mandibular trabecular bone structure were tested for statistical significance by means of multivariate analysis...
April 2012: Clinical Implant Dentistry and related Research
S Ergün, A Saraçoglu, P Güneri, B Ozpinar
OBJECTIVES: Primary hyperparathyroidism (HPT) is a condition caused by an overproduction of parathormone, in excess of the amount required by the body. Its most common cause is a parathyroid gland adenoma and parathyroidectomy is currently the only curative treatment for primary HPT. We present a case history of a 65-year-old patient who was diagnosed with primary HPT after the recognition of dental problems. METHODS: Dental complaints of the patient alerted the dentists, and the patient was referred for further medical evaluation...
July 2009: Dento Maxillo Facial Radiology
Fusun Yasar, Faruk Akgunlu
OBJECTIVES: The aim was to assess whether Fractal Dimension and Lacunarity analysis can discriminate patients having different mandibular cortical shape. METHODS: Panoramic radiographs of 52 patients were evaluated for mandibular cortical index. Weighted Kappa between the observations were varying between 0.718-0.805. These radiographs were scanned and converted to binary images. Fractal Dimension and Lacunarity were calculated from the regions where best represents the cortical morphology...
October 2008: European Journal of Dentistry
Ayşegül Kaya Demirbaş, Selin Ergün, Pelin Güneri, B Oğuz Aktener, Hayal Boyacioğlu
OBJECTIVES: The radiographic changes of mandibular bone texture was evaluated in patients with sickle cell anemia (SCA) and healthy controls. Fractal analysis was employed. STUDY DESIGN: Thirty-five individuals (age range 11 to 40 years) who had been diagnosed as having homozygous SCA were enrolled as the patient group. Twenty-six healthy individuals within the same age range constituted the controls. Panoramic radiographs of all subjects were obtained using analog film and then digitized...
July 2008: Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics
Laura E Rothe, Anne-Marie Bollen, Robert M Little, Susan W Herring, Jeremy B Chaison, Curtis S-K Chen, Lars G Hollender
INTRODUCTION: Dental relapse of the mandibular incisors after orthodontic treatment is a common problem, and few risk factors have been identified. The purpose of this case-control study was to evaluate whether the amount or the structure of mandibular bone affects the potential for postorthodontic mandibular incisor relapse. METHODS: The subject sample was selected from the postretention database at the University of Washington. Subjects were chosen based on the availability of lateral cephalograms and mandibular periapical radiographs taken approximately 10 years postretention (T3)...
October 2006: American Journal of Orthodontics and Dentofacial Orthopedics
Guilherme M Tosoni, Alan G Lurie, Ann E Cowan, Joseph A Burleson
OBJECTIVE: Pixel intensity values (PI) and fractal dimensions (FD) were compared in selected mandibular regions on digital panoramic images of normal, osteopenic, and osteoporotic perimenopausal and postmenopausal women to evaluate their relative efficacies in detecting osteoporotic-associated bone density changes. STUDY DESIGN: Standardized mandibular angle, body, and canine/premolar (C/PM) regions on 54 charge-coupled device (CCD) digital panoramic images of normal and potentially osteoporotic postmenopausal women were analyzed for PI and FD...
August 2006: Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"