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1.
Am J Orthod Dentofacial Orthop ; 157(2): 212-217, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32005473

RESUMO

INTRODUCTION: This study aimed to investigate the association between root morphology of maxillary incisors and nonsyndromic tooth agenesis in patients compared with a control group without agenesis. METHODS: This controlled cross-sectional pilot study (1:4) was performed with a random sample of 335 records from Brazilian applicants for orthodontic treatment, paired by sex and age. Panoramic and periapical radiographs were analyzed to diagnose tooth agenesis and to assess root morphology. The agenesis group (n = 67) included patients with nonsyndromic tooth agenesis, and the control group (n = 268) included patients without tooth agenesis. The statistical analysis included the Student t test and z test, conditional logistic regression, and odds ratio estimates. RESULTS: Occurrence of root morphological changes was significantly higher among patients with agenesis (P <0.05). Significant morphological changes (short, blunt, apically bent, and pipette-shaped roots) were found in the roots of remaining teeth when comparing agenesis and control groups (P <0.05). Patients with agenesis were more likely to show root morphological changes (odds ratio, 74.23; 95% confidence interval, 16.93-325.46; P <0.001). CONCLUSION: Patients with agenesis are more likely to present root morphological changes, which should be considered to minimize problems during orthodontic treatments.


Assuntos
Anodontia , Incisivo , Raiz Dentária , Anodontia/diagnóstico por imagem , Brasil , Estudos Transversais , Humanos , Incisivo/diagnóstico por imagem , Maxila , Projetos Piloto , Radiografia Panorâmica , Raiz Dentária/diagnóstico por imagem
2.
Quintessence Int ; 51(2): 128-141, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31942574

RESUMO

OBJECTIVES: The aim of this study was to determine the influence of patient-related systemic factors, local bone and intraoral factors, and implant-related factors on peri-implant marginal bone loss (MBL). METHOD AND MATERIALS: The following data were collected from patients who received dental implants and were recalled for examinations at least 3 years after treatment completion: medical history, age, sex, habits, periodontal health, implant size and surface, surgical procedure, prosthesis type, implant failure, Plaque Index, and oral hygiene. MBL was investigated using both baseline and follow-up panoramic radiographs. RESULTS: The study included 1,126 dental implants placed in 304 patients (185 [60.9%] women and 119 [39.1%] men). The mean age was 54.30 ± 13.52 years (range 22 to 83 years). The mean follow-up period was 58.8 ± 11.2 months. The MBL was observed in 271 (24.1%) implants, of which 160 (14.2%) were ≤ 2 mm and 111 (9.9%) were > 2 mm. Respective mean MBL values on mesial and distal sides were 0.42 ± 1.03 mm and 0.42 ± 1.02 mm. Of the implants, 19 (1.7%) were lost, leading to an implant success rate of 98.3%. Age, history of hysterectomy, history of periodontitis, oral hygiene, abrasions, smoking, implant location, implant surface, implant length, surgical procedure type, and prosthesis type were all found to be statistically significant for MBL (P < .05). Certain combinations of these factors resulted in increased MBL. CONCLUSION: In the present study, local factors had more significant effects on MBL than did systemic factors, and combinations of these factors had greater effects on MBL.


Assuntos
Perda do Osso Alveolar , Doenças Ósseas Metabólicas , Implantes Dentários , Adulto , Idoso , Idoso de 80 Anos ou mais , Planejamento de Prótese Dentária , Prótese Dentária Fixada por Implante , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Radiografia Panorâmica , Estudos Retrospectivos , Adulto Jovem
3.
Radiologe ; 60(1): 77-92, 2020 Jan.
Artigo em Alemão | MEDLINE | ID: mdl-31919535

RESUMO

Despite the increasing use of modern digital cross-sectional imaging techniques (especially digital volume tomography) in dental X­ray examinations, orthopantomography remains the widely available, commonly used basic imaging modality for evaluating dental status prior to extensive treatment. It is also used for inflammatory and tumorous odontogenic osseous pathologies which are demonstrated with typical imaging findings. The classical X­ray tomography principle has been further developed for the presentation of the differently wide, shape variants of dental arches. The examination unit, consisting of a rigidly connected X­ray tube and detector, runs on an elliptical path around the facial skull. Thereby different rotation centers are controlled. Due to the different distances of the jaw sections to the X­ray tube and the image receiver, differencing velocities result and thus blurring effects as the basis of the layer or slice representation. Slit collimators lead to a narrow and continuous line-like representation of the different widths of the dental arch.


Assuntos
Radiografia Dentária/métodos , Radiografia Panorâmica , Humanos
4.
J Orofac Orthop ; 81(1): 41-51, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31792608

RESUMO

OBJECTIVES: The aim of this retrospective study is to compare external apical root resorption (EARR) after labial and lingual fixed orthodontic treatment, as detected with panoramic radiographs. MATERIALS AND METHODS: Sixty subjects were divided into two groups according to the treatment type: lingual (30 patients) and labial (30 patients) fixed orthodontic treatment. Panoramic radiographs which were obtained at the beginning of treatment (T0) and at the end of the treatment (T1) were evaluated. The maxillary and mandibular central and lateral incisors, as well as canine crown and root lengths were measured for T0 and T1. Crown to root ratios were used to determine EARR. Data were evaluated using analysis of variance and χ2 analysis. RESULTS: In all, 5 patients (16.7%) in the lingual group and 7 patients (23.3%) in the labial group had a minimum of one tooth with severe EARR, while 9 patients (30%) in the lingual group and 14 patients (46.7%) in the labial group had no EARR. A total of 26 teeth (7.2%) in the lingual group and 34 teeth (9.4%) in the labial group developed severe EARR; however, 184 teeth (51.1%) in the lingual group and 202 teeth (56.1%) in the labial group did not reveal any EARR. No statistically significant difference was found for the resorption rates between the treatment groups (p > 0.05). Although not statistically significant, there was a higher percentage of severe EARR in the mandible within the labial group. CONCLUSIONS: Both lingual and labial orthodontic techniques showed statistically similar root resorption rates. EARR is a multifactorial issue and individual predispositions must also be taken into consideration.


Assuntos
Reabsorção da Raiz , Humanos , Incisivo , Aparelhos Ortodônticos , Aparelhos Ortodônticos Fixos , Radiografia Panorâmica , Estudos Retrospectivos
5.
Oral Dis ; 26(1): 152-158, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31677205

RESUMO

OBJECTIVES: The aim of the current study was to evaluate the detection and diagnosis of three types of odontogenic cystic lesions (OCLs)-odontogenic keratocysts, dentigerous cysts, and periapical cysts-using dental panoramic radiography and cone beam computed tomographic (CBCT) images based on a deep convolutional neural network (CNN). METHODS: The GoogLeNet Inception-v3 architecture was used to enhance the overall performance of the detection and diagnosis of OCLs based on transfer learning. Diagnostic indices (area under the ROC curve [AUC], sensitivity, specificity, and confusion matrix with and without normalization) were calculated and compared between pretrained models using panoramic and CBCT images. RESULTS: The pretrained model using CBCT images showed good diagnostic performance (AUC = 0.914, sensitivity = 96.1%, specificity = 77.1%), which was significantly greater than that achieved by other models using panoramic images (AUC = 0.847, sensitivity = 88.2%, specificity = 77.0%) (p = .014). CONCLUSIONS: This study demonstrated that panoramic and CBCT image datasets, comprising three types of odontogenic OCLs, are effectively detected and diagnosed based on the deep CNN architecture. In particular, we found that the deep CNN architecture trained with CBCT images achieved higher diagnostic performance than that trained with panoramic images.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Aprendizado Profundo , Cisto Dentígero/diagnóstico por imagem , Cistos Odontogênicos/diagnóstico por imagem , Cisto Radicular/diagnóstico por imagem , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Radiografia Panorâmica , Adulto Jovem
6.
Acta Odontol Scand ; 78(1): 1-5, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31282797

RESUMO

Objective: (1) To test Hägg-Taranger's method of dental age assessment (DAA) in Bogotanian children comparing findings by sex with Swedishes' standards and (2) to investigate its chronological age predictive value for identification purposes.Material and methods: Dental age was assessed in 5-14-year-old Bogotanians, 2075 girls and 2032 boys and compared with the method's standards. For statistical analysis, matched-pair signed-rank tests were used, and a regression model was used for investigating value as chronological age predictor from dental age.Results: No significant difference was found between means of dental ages of Bogotanians and Swedishes, except for the lower central incisors' and second molars' emergences. Differences by sex between dental age means were seen at all stages especially, in mixed dentition (p<.01), being Bogotanian girls earlier maturers than boys. The established regression model as chronological age predictor, was tested by the coefficient of determination, which was found r2=0.979 for girls, and 0.957 for boys.Conclusions: Sexual dimorphism in dental age suggests Hägg-Taranger's method for identification by sex at mixed dentition. Additionally, high coefficients of determination show its reliability as chronological age predictor for ages from 5 to 12 years in girls, and to 13 years in boys.


Assuntos
Determinação da Idade pelos Dentes/métodos , Erupção Dentária , Dente/fisiologia , Adolescente , Fatores Etários , Criança , Pré-Escolar , Colômbia , Dentição Mista , Feminino , Humanos , Masculino , Dente Molar , Valor Preditivo dos Testes , Radiografia Panorâmica , Padrões de Referência , Valores de Referência , Reprodutibilidade dos Testes , Suécia , Dente/crescimento & desenvolvimento
7.
Odontology ; 108(1): 124-132, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31209581

RESUMO

The study aimed to stratify the risk of inferior alveolar nerve injury (IANI) after lower third molar (LM3) surgery with a scoring system using identified predictive factors based on cone-beam computed tomography (CBCT) images. In a case-control study, the primary outcome was IANI occurrence. The control group included randomly selected patients without IANI. Predictor variables included patient demographics, surgical situations, Pell-Gregory classification, and inferior alveolar canal (IAC)-associated factors on CBCT. Study variables were analyzed using logistic regression models. Risk stratification was assessed by a scoring system that was constructed using independent predictors. The 858 patients who underwent LM3 surgery (1177 teeth) after CBCT scan were divided into case (25 patients, 2.9%, 27 teeth) and control (235 patients, 300 teeth) groups. In the multivariate model, lingual/inter-radicular position of IAC [odds ratio (OR) 7.21; P < 0.001; assigned score, 2], multiple roots closed to the IAC with cortical perforation (OR 3.72; P = 0.015; 1), and age > 30 years (OR 4.99; P = 0.008; 2) were associated with an increased IANI-risk. The IANI-risk scoring system could be stratified into low- and high-risk groups at a cutoff score of 3 (sensitivity, 68.0%; specificity, 90.6%; positive predictive value, 17.8%; positive likelihood ratio, 7.23). In conclusion, the high-risk group of IANI after LM3 surgery corresponded to individuals with multiple factors: lingual/inter-radicular IAC position to LM3, multiple roots with perforated IAC, and increased age (> 30 years). Raising awareness of the higher probability for IANI is needed for patients with multiple aforementioned factors.


Assuntos
Dente Serotino , Traumatismos do Nervo Trigêmeo , Estudos de Casos e Controles , Tomografia Computadorizada de Feixe Cônico , Humanos , Mandíbula , Nervo Mandibular , Radiografia Panorâmica , Medição de Risco , Extração Dentária
8.
Niger J Clin Pract ; 22(12): 1644-1653, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31793469

RESUMO

Objectives: To assess the validity of using the calibration ruler for correcting magnification of linear measurements and to explore and compare the vertical and horizontal magnification of four digital cephalometric units. Methods: An acrylic box was imaged at seven sagittal positions using four digital cephalometric units: Orthopantomograph OC100, Orthopantomograph OC200, Sirona Orthophos CD, and Sirona Orthophos DS. The true linear lengths of the phantom, corrected, and uncorrected linear lengths on the images were measured and compared. The validity of measurements using the calibration ruler was assessed. The magnification values and distortion indices were calculated and compared among the four cephalometric units. Results: For linear measurements on the mid-sagittal plane and averaged linear measurements on bilateral symmetric sagittal planes, the bias 1.96 STD of the calibration ruler ranged from 1% to 2% for the four cephalometric testing units. For linear measurements on the single lateral sagittal plane, the bias 1.96 STD ranged from 3% to 6%. The vertical scanning charge-coupled device cephalometric unit produced the greatest distortion, ranging from 1.029 to 0.964. Conclusion: The metal millimeter calibration ruler is an accurate reference for linear measurement magnification correction. Because of unpredictability and machine specificity, the magnification and distortion of a cephalometric unit should be calibrated for the estimation of cephalometric measurement error.


Assuntos
Calibragem/normas , Cefalometria/métodos , Radiografia Dentária Digital/instrumentação , Algoritmos , Cefalometria/normas , Humanos , Ortodontia/instrumentação , Imagens de Fantasmas , Ampliação Radiográfica , Radiografia Dentária Digital/métodos , Radiografia Panorâmica , Ecrans Intensificadores para Raios X
9.
J Contemp Dent Pract ; 20(9): 1019-1023, 2019 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-31797822

RESUMO

AIM: The present investigation aims to find out the frequency of congenitally missing upper lateral incisors among skeletal class I, II, and III malocclusions and to find out its variability among different genders. MATERIALS AND METHODS: The study sample included orthopantomograms (OPGs) and a lateral cephalogram of 1,000 patients retrieved from previous records. Of the selected samples, 290 were males and 710 were females. Orthopantomograms helped diagnose the presence of unilateral/bilateral maxillary lateral incisors. Results and statistics: Of the 1,000 samples, 710 (71%) were female and 290 (29%) were male patients. An estimated 37 (3.77%) patients were found to have missing maxillary lateral incisors. Of the female patients, 4.04% were having missing laterals, whereas 3.10% of the male patients were having agenesis of maxillary incisors. Totally, 0.9% of missing upper laterals were recorded in males, whereas 2.8% of missing lateral incisors in upper arch were found in females. A total of 54.16% of skeletal class I, 33.33% of skeletal class II, and 12.5% of skeletal class III cases were found to have missing upper lateral incisors. CONCLUSION: The prevalence rate for congenitally missing upper lateral incisors in orthodontic adolescent Odia population in Bhubaneswar is 3.77%. The females had a greater percentage of agenesis of the upper lateral incisor when compared to males. An estimated 54.16% of skeletal class I, 33.33% of skeletal class II, and 12.5% of skeletal class III cases were found to have missing upper lateral incisors. This difference might be due to genetic variations or different environmental conditions. A multidisciplinary treatment protocol must be planned to manage the missing maxillary lateral incisor and to restore the impaired esthetics and function.


Assuntos
Anodontia , Má Oclusão , Adolescente , Estética Dentária , Feminino , Humanos , Incisivo , Masculino , Maxila , Radiografia Panorâmica
10.
Rev Med Liege ; 74(12): 672-676, 2019 Dec.
Artigo em Francês | MEDLINE | ID: mdl-31833279

RESUMO

The destructive lesions of the jaws destroying the normal bone structure with involvement of the cortex are mostly diagnosed incidentally during a dental examination. or imaging examination for another pathology. The rest of the time they are suspected in front of an aesthetic deformation of the face, in particular of the cheek or the chin. In order to explore these lesions we use the Panoramic Radiography, Computed Tomography (CT) without and with intravenous injection of contrast medium, Cone Beam Computed Tomography (CBCT) and nuclear Magnetic Resonance Imaging (MRI). This article aims to determine the diagnostic range of destructive lesions of the jaws by CT, especially by CBCT, and to propose a diagnostic algorithm according to the circumstances of discovery of these lesions.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Arcada Osseodentária , Tomografia Computadorizada por Raios X , Humanos , Arcada Osseodentária/diagnóstico por imagem , Arcada Osseodentária/patologia , Imagem por Ressonância Magnética , Radiografia Panorâmica
11.
Indian J Dent Res ; 30(5): 687-691, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31854357

RESUMO

Background: Age of a child can be assessed from various parameters such as chronological age, height, weight, secondary sexual characteristics, skeletal age, or dental age. The present study was planned to assess and compare chronological age with dental age (Demirjian's method and Willem's method) and skeletal age (Fishman's method). Materials and Methods: The present study was done on a sample of 100 children in the age group of 9-14 years. The chronological age was computed through the birth certificates and dental age was calculated from their orthopantomograms (OPGs) using Demirjian's and Willem's methods. Hand-wrist radiograph of the left hand was used to compute skeletal age using Fishman's method. Paired t-test and Pearson's correlation coefficients were calculated as a part of statistical analysis at a significance level of P < 0.01. Results: The mean chronological age among the group was 12.37 ± 1.34 years, the mean dental age by Demirjian's method was 12.36 ± 1.72 years, the mean dental age by Willem's method was 12.36 ± 1.51, and the mean skeletal age by Fishman's method was 13.03 ± 1.34 years. Out of the all methods evaluated in the study, Fishman's method of age estimation showed the least value of correlation coefficient (r = 0.728) with the chronological age, whereas Willem's method showed the maximum correlation with the chronological age (r = 0.885). Conclusion: It can be concluded from the present study that the dental age estimation evaluated by the digital OPG by both the methods, that is, Demirjian's method and Willem's method, has shown high accuracy when applied to the children of Faridabad. Skeletal maturation evaluated by Fishman's method using hand-wrist radiographs was found to overestimate the age when compared to chronological age in both the sexes.


Assuntos
Determinação da Idade pelos Dentes , Odontologia Legal , Adolescente , Determinação da Idade pelo Esqueleto , Criança , Humanos , Radiografia , Radiografia Panorâmica
12.
Indian J Dent Res ; 30(5): 722-730, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31854363

RESUMO

Introduction: The number of women with osteoporosis i.e. with reduced bone mass and disruption of bone architecture, is increasing in India due to severe deficiency of Vitamin D. It has been reported throughout the country in urban and rural post-menopausal women. Vitamin D synthesis is affected by geographical location, atmospheric pollution, clothing, melanin pigmentation and sunlight exposure. Moreover, ageing is also associated with decreased vitamin D synthesis. Vitamin D deficiency is the most underdiagnosed medical condition in postmenopausal woman. Objective: Therefore, this study was planned to estimate and to evaluate alveolar bone mass using radio morphometric indices in postmenopausal women and its correlation with serum vitamin D3. Materials and Methods: We conducted a study comprising of a study group of 60 post-menopausal women, divided into 2 sub-groups, each group comprising of 30 individuals, depending on their occupation and domicile. Blood samples were taken to evaluate serum vitamin D3 level. Also, panoramic radiographs of all the study subjects were recorded for evaluation of 3 radio morphometric indices viz. mandibular cortical index (MCI), mental index (MI), and panoramic mandibular index (PMI). Results: Statistical analysis revealed higher significant values in rural than in urban postmenopausal woman. Conclusions: A high overall prevalence (90%) of vitamin D deficiency was also observed in the study subjects.


Assuntos
Osteoporose Pós-Menopausa , Densidade Óssea , Colecalciferol , Feminino , Humanos , Índia , Mandíbula , Pós-Menopausa , Radiografia Panorâmica
13.
Indian J Dent Res ; 30(5): 747-750, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31854367

RESUMO

Background: Osteoporosis and periodontitis are both diseases that induce bone resorption. The objective of this study was to verify through panoramic radiography analysis whether patients with osteoporosis have a greater risk of periodontal disease (horizontal alveolar bone defect and vertical alveolar bone defect) when compared with patients without osteoporosis. Methods: In all, 100 women were selected: 50 with osteoporosis (T-score < -2.5 DP) and 50 without osteoporosis (T-score > -2.5 DP), using the T-score of proximal radius. Logistic regression test was performed to assess the risk of panoramic radiographic periodontal defects (horizontal and vertical bone defect), age, and bone mineral density influence. Results: Advanced age women were three times more likely to present osteoporosis. Patients with osteoporosis have significantly higher risk (4.46 times) of presenting horizontal alveolar bone defect. Vertical alveolar bone defect results were nonsignificant. Conclusion: Our study results corroborate the literature trend that osteoporosis may influence the progression of alveolar ridge height loss (horizontal alveolar bone defect). Panoramic radiography may be used as a screening tool to help the diagnosis of periodontal bone loss in patients with osteoporosis.


Assuntos
Perda do Osso Alveolar , Osteoporose , Periodontite , Processo Alveolar , Densidade Óssea , Feminino , Humanos , Radiografia Panorâmica
14.
J Craniomaxillofac Surg ; 47(11): 1767-1778, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31711997

RESUMO

Intermaxillary fixation (IMF) and osteosynthesis plates (OP) are widely used for the non-surgical and surgical treatment of mandible and condyle fractures. The aim of this retrospective study was to analyze the frequency of tooth root injuries by IMF and OP screws. Electronic patient reports (2004-2013) were screened for patients treated with either IMF screws and/or OP in the Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Germany. The frequency and the position of endangered and injured teeth were analyzed by orthopantomogram (OPTG) and cone beam computer tomography (CBCT). Next, possible predictive factors for tooth root injuries, namely interdental- and crestal distance, screw length and distance between tooth root and screw were evaluated. Further, the accuracy of OPTG vs. CBCT concerning the diagnosis of tooth root injuries was analyzed. Three-hundred sixty-six patients were included and 3388 teeth were defined as endangered by IMF- and OP screws. Overall, 16 injured teeth (0.5%) in 13 patients (3.55%) were detected. Nine injuries (56.3%) were caused by IMF- and seven injuries (43.8%) by OP screws. Three teeth were non-vital, one tooth had to be extracted. No correlation between the predictive factors crestal distance, screw length and tooth root injuries was found. If tooth injury occurred, a significant correlation between the interdental distance and the distance between tooth root and screw was found (κ = 0.48; p < 0,0001). Comparison between OPTG vs. CBCT demonstrated that many of the injuries that were seen in the OPTG (n = 230) could not be verified in the CBCT scans (n = 16) (κ = 0.12). To conclude, screws for IMF and OP can be considered as a safe procedure concerning the risk of tooth root injuries.


Assuntos
Parafusos Ósseos , Fixação Interna de Fraturas/instrumentação , Traumatismos Dentários/cirurgia , Tomografia Computadorizada de Feixe Cônico , Alemanha , Humanos , Radiografia Panorâmica , Estudos Retrospectivos , Traumatismos Dentários/diagnóstico por imagem , Raiz Dentária/lesões , Resultado do Tratamento
15.
Oral Health Prev Dent ; 17(5): 425-431, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31612160

RESUMO

PURPOSE: Florid cemento-osseous dysplasia (COD) is a well-described condition that occurs predominantly in black women. The lesion is usually asymptomatic, but in severe cases, symptoms can occur in association with focal expansion due to infection. The safety of dental procedures that involve areas with florid COD has been little discussed. Therefore, the present study aims to emphasise the importance of nonsurgical periodontal treatment in patients with periodontal diseases and COD. MATERIALS AND METHODS: Four thousand five hundred panoramic radiographs from the image bank of the School of Dentistry of Ribeirão Preto were clinically and radiographically evaluated. RESULTS: Eleven patients had images compatible with florid COD. Eight patients were asymptomatic and three symptomatic. All patients were diagnosed with chronic periodontitis (CP) and their panoramic radiographs showed mixed radiopaque and radiolucent images in the alveolar bone. In symptomatic patients, besides the clinical signs of CP, exposed bone with severe suppuration occurred in the posterior region of the mandible. CONCLUSIONS: The maintenance of systemic and oral health is mandatory to prevent secondary infections, and knowledge about the interface between different dental specialties and florid COD management may prevent erroneous decisions and ensure patient safety, taking into account the dental treatment that can be performed without further complications.


Assuntos
Displasia Fibrosa Óssea , Osteomielite , Diagnóstico Diferencial , Feminino , Humanos , Radiografia Panorâmica
16.
Swiss Dent J ; 129(10): 817-820, 2019 Oct 14.
Artigo em Alemão | MEDLINE | ID: mdl-31607117

RESUMO

A patient with an abscess of the canine fossa starting from the tooth 13 turned up at the dental office. Such an abscess requires immediate and consistent surgical intervention to avoid potential lethal complications for the patient. The highlying swelling reaching the infraorbital area was quite impressive in this case. The panoramic radiograph that was taken (Fig. 1) revealed a canine of considerable radiographic length. The upper canines of the human have the greatest mean length of all the teeth of the human dentition. A conservative tooth treatment can cause problems just as a surgical tooth preservation in the context of a root tip resection would. An alio loco trepanation and root canal preparation had previously been unsuccessful. The instrumen-tation of the tooth was impossible for the colleague due to its canal length. The difficult access to the root tip as well as the degree of destruction on the palatal side and the abscess spoke in this case against a resection and for the extraction of the tooth. After surgical removal and measurement of the tooth, it was confirmed that with 37.2 mm this was the longest tooth ever extracted by a human being.


Assuntos
Dente Canino , Preparo de Canal Radicular , Raiz Dentária , Abscesso , Dente Pré-Molar , Humanos , Radiografia Panorâmica , Raiz Dentária/anatomia & histologia
17.
Niger J Clin Pract ; 22(10): 1435-1440, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31607736

RESUMO

Aims: The aim of this study was to evaluate the mandibular bone changes on panoramic radiographs of thalassemia and sickle cell anemia (SCA) patients using fractal dimension (FD) analysis and to compare the findings obtained from healthy individuals. Materials and Methods: A total of 90 panoramic radiographs (from 30 patients with thalassemia, 30 patients with SCA and 30 healthy individuals) were assessed to measure FD, mandibular cortical width (MCW), panoramic mandibular index (PMI) in the mandible. Three region of interests (ROI) of angulus, corpus, and interdental bone were created. FD was calculated using ImageJ program. Results: In thalassemia group, the mean value of FD was 1.11, 1.03, and 1.02 in interdental bone, corpus, and angulus, respectively. In SCA group, the mean value of FD was 1.10, 1.05, and 1 in interdental bone, corpus, and angulus, respectively. In control group, the mean value of FD was 1.09, 1.04, and 1 in interdental bone, corpus, and angulus, respectively. FD value of interdental bone are significantly higher in thalassemia group than control group. FD values of corpus and angulus values did not show a significant difference between the groups. Conclusions: Fractal analysis may be used and recommended for evaluation of the bone changes induced by hemoglobinopathies.


Assuntos
Anemia Falciforme/patologia , Mandíbula/diagnóstico por imagem , Radiografia Panorâmica/métodos , Talassemia/patologia , Adulto , Estudos de Casos e Controles , Feminino , Fractais , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Turquia
18.
J Forensic Odontostomatol ; 37(2): 18-24, 2019 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-31589592

RESUMO

The aim of this study was to determine if edentulous persons could be identified using panoramic images by: I) investigating the possibility of matching two panoramic radiographs of the same person obtained on two different occasions, II) determining what anatomical features are used as the base for matching, III) investigating if oral and maxillofacial radiologists (OMR) and dentists who were not oral and maxillofacial radiologists (NOMR) differed in their ability to match the images, and IV) determining if the time elapsed between the images affected the results or the confidence of the match. Panoramic image pairs from 19 patients obtained on two different occasions were included, plus 10 images from other edentulous patients. The time elapsed between the image pairs varied between 4 months and 6 years. Four OMR and four NOMR were asked to match the image pairs depicting the same patient. The participants marked each match as "certain", "likely", or "possible" and what anatomical structure they used for matching. The OMR group correctly matched 100% of the images and the NOMR group correctly matched 96%. The anatomy of the mandible was most often used for matching. The OMR group was more certain in their decisions than the NOMR group. The time elapsed between the examinations did not affect the result. In conclusion, panoramic images can be used to identify edentulous patients. Both OMR and NOMR could identify edentulous individuals when only panoramic radiographic images were available and the OMR were especially confident in the identification process.


Assuntos
Boca Edêntula , Humanos , Mandíbula , Radiografia Panorâmica
19.
J Forensic Odontostomatol ; 37(2): 35-44, 2019 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-31589594

RESUMO

The human mandible is routinely utilised as part of the assessment of biological identity in forensic anthropological and odontological practice. The research introduces a novel geometric morphometric technique to investigate and quantify shape variation in the morphology of the mandibular corpus and ascending ramus and consequently highlights the potential for forensic purposes. Human mandibles from digital clinical orthopantomogram X-ray images, based on a sample of 50 male and 50 female adults from a modern Italian population, were examined. Three fixed landmarks were applied to the symphysis and condyle and 50 semi-landmarks re-sampled along the inferior corpus and the posterior ramus. Symmetrical reflection was applied yielding 200 configurations of 53 landmarks. Shape analyses were undertaken via: Procrustes superimposition; principal components analysis to investigate patterns of variation; classification using linear discriminant analysis with leave-one-out cross-validation; partial least squares (PLS) to test for structural modularity; and finally, retitle page sampling and re-analysis following PLS to optimize shape classification criteria. Stepwise re-sampling of landmarks reached an optimum cross-validated classification of 94.0% based on 25 landmarks; the results are strongly significant and suggest that the shape relationship between the mandibular corpus and ramus offers significant potential for forensic identification purposes using this method.


Assuntos
Radiografia Dentária Digital , Caracteres Sexuais , Adulto , Feminino , Humanos , Masculino , Mandíbula , Radiografia Panorâmica , Raios X
20.
Dent Med Probl ; 56(3): 279-283, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31577072

RESUMO

BACKGROUND: The mandibular incisive canal (MIC) is a neural canal containing one of the lower branches of the inferior alveolar nerve, called the mandibular incisive nerve, which can get damaged and cause complications during the removal of bone from the interforaminal region. OBJECTIVES: The aim of this study was to determine the effect of the inversion filter (IF) on improving the visibility of MIC as compared to the original images. MATERIAL AND METHODS: In this retrospective, descriptive, analytical study, 343 samples of digital panoramic radiography were examined. The images were analyzed with and without IF. The frequency and confidence intervals (CIs) of identifying MIC were used to determine its visibility, both with IF and in the original images. Besides, the difference between the maximum and minimum diameters of the canal as well as the distance from MIC to the alveolar crest and to the mental foramen were examined. For statistical analysis, McNemar's test and the paired t-test were used, and the concordance was calculated using the kappa coefficient. RESULTS: No significant differences were found in the prevalence of the incisive canal, or in its unilateral or bilateral visibility between the original and filtered radiography in this study (p = 0.42 and p = 0.67, respectively). The absolute values of the interval difference between MIC and the mental foramen, the maximum and minimum diameters of MIC, and the distance from MIC to the alveolar crest were statistically significant between the filtered and original radiography, although the difference was clinically unimportant. CONCLUSIONS: The use of IF produced results similar to the original radiography; its application neither increased the clarity nor improved the visibility of the incisive canal.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Mandíbula , Radiografia Dentária Digital , Mandíbula/diagnóstico por imagem , Mandíbula/inervação , Radiografia Panorâmica , Estudos Retrospectivos
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