scholarly journals A Comparative study to measure the horizontal condylar guidance obtained by protrusive interocclusal records and panoramic radiographic images in completely edentulous patients

2018 ◽  
Vol 14 (1) ◽  
pp. 21-27
Author(s):  
Arjun Bhandari ◽  
Archana Manandhar ◽  
Raj Kumar Singh ◽  
Pramita Suwal ◽  
Prakash Kumar Parajuli
Keyword(s):  
Zinc Oxide ◽  
Horizontal Plane ◽  
Significant Positive Correlation ◽  
Panoramic Radiograph ◽  
Articular Eminence ◽  
Radiographic Images ◽  
The Mean ◽  
Edentulous Patients ◽  
The Right ◽  
Interocclusal Records

Background & Objectives:The study was conducted with objective to compare the horizontal condylar guidance (HCG) obtained by protrusive interocclusal records and panoramic radiographic images in completely edentulous patients.Materials & Methods:The horizontal condylar guidance was measured in 25 completely edentulous patients by protrusive interocclusal records using zinc oxide eugenol paste through a face bow transfer (HanauTM Spring bow, Whip Mix Corporation, USA) to a semi-adjustable articulator (HanauTM Wide-Vue Articulator, Whip Mix Corporation, USA).  In the same patients, HCG was traced in the panoramic radiograph. The angles formed by the intersection of two lines: Frankfurt’s horizontal plane and posterior slope of articular eminence was measured using protractor to represent the horizontal condylar guidance angle on each side.Results:The mean difference between the horizontal condylar guidance angles values obtained using protrusive interocclusal record and panoramic radiograph was 2.68 degrees and 3.40 degrees for the right and the left side respectively, with the panoramic radiograph values being higher. This difference between the values was found to be highly significant between the two methods for the right side (t = 2.70, p = 0.012) and left side (t = 3.69, p = 0.001). A significant positive correlation was found between the horizontal condylar guidance obtained from protrusive interocclusal record and panoramic radiograph for the right (r = 0.643, p = 0.001) and left sides (r = 0.622, p = 0.001) separately.Conclusion:The panoramic radiographic tracing can be used to calculate the mean horizontal condylar guidance in the completely edentulous patients and these values can be used to programme semi-adjustable articulators avoiding the cumbersome process of obtaining protrusive interocclusal records.

scholarly journals Mandibular Metastasis of a Recurrent Poorly Differentiated Urothelial Bladder Carcinoma

2020 ◽  
Vol 10 ◽  
pp. 27
Author(s):  
Georges Aoun ◽  
Elie Hayek ◽  
Ibrahim Nasseh
Keyword(s):  
Bladder Carcinoma ◽  
Panoramic Radiograph ◽  
Final Diagnosis ◽  
Metastatic Lesion ◽  
Radiographic Images ◽  
Urothelial Bladder Carcinoma ◽  
Multiple Imaging ◽  
Oral Neoplasms ◽  
Urothelial Bladder ◽  
The Right

Metastatic lesions to the oral cavity are uncommon; they represent between 1 and 3% of all malignant oral neoplasms. In this article, we report a rare case of metastatic urothelial bladder carcinoma in the mandible detected on oral radiographic images and confirmed with multiple imaging modalities. A 67-year-old woman presented to our clinic suffering from pain in the right side of the mandible with a mild swelling. Panoramic radiograph revealed an ill-defined relatively radiolucent lesion in the right mandibular premolar-canine region presenting with permeative changes. Cone-beam computed tomography showed a relatively hypodense lesion with demineralization, interruption of the buccal cortices, and slight thickening and sclerosis of the buccal cortical bone. The patient was referred for further evaluation including additional advanced imaging radiographic techniques (MRI and PET scan) and clinical and histopathological examinations that lead to a final diagnosis of metastatic lesion from an underlying urothelial bladder carcinoma.

scholarly journals The Age- and Gender-wise Assessment of the Position and Shape of Mental Foramen in Patients’ Panoramic Radiography

2021 ◽  
Vol 23 (6) ◽  
pp. 806-817
Author(s):  
Hamzeh Ekran ◽  
◽  
Amin Ghanbarnejad ◽  
Masomeh Afsa‌ ◽  
◽  
...  
Keyword(s):  
Mental Foramen ◽  
Anatomical Landmarks ◽  
Radiographic Images ◽  
Panoramic Images ◽  
The Mean ◽  
And Gender ◽  
Student’S T ◽  
The Right ◽  
Posterior Position ◽  
Anterior Posterior

Background and Aim: Recognizing the position of the Mental Foramen (MF) is essential in numerous cases, such as anesthesia injection and periapical surgeries in the anterior region of the mandible. Furthermore, the diversity in the location and position of MF can develop problems during surgery in this region. Methods & Materials: The present study examined anatomical landmarks based on panoramic radiographic images obtained in Bandar Abbas City, Iran. In total, 450 panoramic radiographic images of men and women were assessed. All explored images were converted to JPEG format and entered in real size in Auto CAD software (2014). The collected data were analyzed in SPSS by one-way Analysis of Variance (ANOVA), Student’s t-test, and Chi-squared test. Ethical Considerations: This study was approved by the Ethics Committee of Hormozgan University of Medical Sciences (Code: IR.HUMS.REC.1394.189). Results: The obtained data revealed that the mean distance from the MF to the lower edge of the mandible on the right and left was 10.53 mm and 10.51 mm, respectively. The mean distance from the MF to the posterior side of the mandible equaled 49.36 mm on the right and 48.72 mm on the left. Moreover, the mean distance of MF to the midline of the lower jaw on the right and left was calculated as 27.16 and 26.27 mm, respectively. Furthermore, in most cases, the anterior-posterior position of MF was symmetrical concerning anatomical landmarks. The anterior-posterior distance of MF to mandibular midline was significantly different between the explored males and females (P<0.001). There was no significant gender-wise difference in the shape of the MF (P=0.89). Conclusion: The present research results signified that the most frequent anterior-posterior position of the MF is between the apex of the first and second premolars. Furthermore, the most prevalent shape of MF is oval per panoramic images.

scholarly journals Influence of Anterior Guidance on the Inclination of Horizontal Condylar Guidance in Dentulous Subjects - A Clinical Study

2021 ◽  
Vol 10 (28) ◽  
pp. 2072-2077
Author(s):  
Naresh Shetty ◽  
Sanath Shetty ◽  
Hasan Sarfaraz ◽  
Syed Ghouse Ahmed ◽  
Fahad Mohammad
Keyword(s):  
Pearson Correlation ◽  
Mean Values ◽  
Incisal Edge ◽  
Anterior Guidance ◽  
Correlation Tests ◽  
The Mean ◽  
Group 2 ◽  
The Right ◽  
Interocclusal Records ◽  
One Way Anova

BACKGROUND One of the most widely used methods to record horizontal condylar guidance is the use of protrusive interocclusal records. Therefore, this study was done to evaluate the reliability of protrusive interocclusal record with and without the influence of anterior determinant on horizontal condylar guidance among dentulous patients. METHODS Diagnostic impressions of 21 participants were made and casts were poured. Facebow record were obtained and transferred to semi-adjustable articulator. Protrusive interocclusal records were made using Alu-wax. In group 1, protrusive interocclusal records were obtained at incisal edge to edge position (conventional method). In group 2, 3 and 4 protrusive interocclusal records were obtained at a distance of 4 mm, 6 mm and at incisal edge to edge position respectively using a customized flat anterior jig. Programming of the Hanau articulator were done for all the 4 groups. One-way ANOVA test and Pearson’s correlation tests were done to compare and correlate horizontal condylar guidance. RESULTS The mean values obtained for flat anterior jig at incisal edge to edge position, at 4 mm and 6 mm provided good Pearson correlation values for the right (R = 0.773, R = 0.779, R = 0.632) as well as the left side (R = 0.631, R = 0.601, R = 0.545) respectively, on comparison with the conventional incisal edge to edge values. This indicated a positive correlation which was statistically significant. CONCLUSIONS The horizontal condylar guidance is influenced by anterior determinant. Therefore, the reliability of protrusive records is dependent on eliminating the influence of anterior determinant. KEY WORDS Horizontal Condylar Guidance, Anterior Determinant, Protrusive Interocclusal Records

scholarly journals Identification of dental implants using deep learning—pilot study

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Toshihito Takahashi ◽  
Kazunori Nozaki ◽  
Tomoya Gonda ◽  
Tomoaki Mameno ◽  
Masahiro Wada ◽  
...  
Keyword(s):  
Deep Learning ◽  
Object Detection ◽  
Panoramic Radiograph ◽  
Detection Algorithm ◽  
Learning Performance ◽  
Identification System ◽  
Limited Data ◽  
Radiographic Images ◽  
The Mean ◽  
Implant System

Abstract Background In some cases, a dentist cannot solve the difficulties a patient has with an implant because the implant system is unknown. Therefore, there is a need for a system for identifying the implant system of a patient from limited data that does not depend on the dentist’s knowledge and experience. The purpose of this study was to identify dental implant systems using a deep learning method. Methods A dataset of 1282 panoramic radiograph images with implants were used for deep learning. An object detection algorithm (Yolov3) was used to identify the six implant systems by three manufactures. To implement the algorithm, TensorFlow and Keras deep-learning libraries were used. After training was complete, the true positive (TP) ratio and average precision (AP) of each implant system as well as the mean AP (mAP), and mean intersection over union (mIoU) were calculated to evaluate the performance of the model. Results The number of each implant system varied from 240 to 1919. The TP ratio and AP of each implant system varied from 0.50 to 0.82 and from 0.51 to 0.85, respectively. The mAP and mIoU of this model were 0.71 and 0.72, respectively. Conclusions The results of this study suggest that implants can be identified from panoramic radiographic images using deep learning-based object detection. This identification system could help dentists as well as patients suffering from implant problems. However, more images of other implant systems will be necessary to increase the learning performance to apply this system in clinical practice.

Conventional Versus Implant-Retained Overlay Dentures: A Pilot Study of Masseter and Anterior Temporalis Electromyography

2014 ◽  
Vol 40 (4) ◽  
pp. 418-424 ◽  
Author(s):  
Mansour Dakhilalian ◽  
Mansour Rismanchian ◽  
Akbar Fazel ◽  
Keyvan Basiri ◽  
Hamid Azadeh ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Complete Dentures ◽  
Gum Chewing ◽  
Wave Range ◽  
Left And Right ◽  
The Mean ◽  
Edentulous Patients ◽  
The Right ◽  
Cotton Roll ◽  
Masseter Muscles

Implant-supported overlay dentures (ISODs) have been widely accepted among patients using conventional removable complete dentures (CRCDs). The present study aimed to comparatively study conventional and ISODs in terms of function and coordination of masticatory muscles using electromyograms. Included were 10 patients with ISODs (each with 2 implants in the intercanine area). The mean wave range (MWR) and frequency (MWF) of masseter and temporalis were recorded with (ISOD) and without (CRCD) ball attachments while maximum clenching on cotton rolls (cotton roll clenching), maximum intercuspal clenching (clenching), and unilateral gum chewing (chewing) using electromyography. Data were analyzed in SPAW using t-paired for matched groups and independent-sample t tests for unmatched ones. The MWF differences were not statistically significant with or without attachments (P &gt; .05). Without attachments in place, the MWF of both masseter and temporalis muscles significantly decreased when patients clenched on cotton rolls (P = .01 and .02, respectively) and when chewing unilaterally (both P = .01). With attachments present, the right and left temporalis muscles did not show identical mean wave ranges while chewing (P = .01). Without attachments, this disharmony was seen in the left and right masseter muscles (P = .03). The MWR of masseter was higher in men while chewing with attachments (P = .02). Without attachments, the MWR of temporalis was higher in women while cotton roll clenching (P = .03) and chewing (P = .02). These findings are seemingly in favor of improved masticatory function and coordination in edentulous patients with the application of ISODs.

scholarly journals Study on the Length and the Breadths of Tendoachilles of Human Cadaver

2018 ◽  
Vol 17 (3) ◽  
pp. 388-394
Author(s):  
Lutfun Nahar ◽  
Ahmad Seraji ◽  
Soniya Fahmi ◽  
Khandaker Nadia Afreen ◽  
Mahbuba Aktar ◽  
...  
Keyword(s):  
Significant Positive Correlation ◽  
Medical Science ◽  
Cross Sectional ◽  
Male And Female ◽  
Positive Correlation ◽  
Medical College ◽  
Significant Difference ◽  
Human Cadavers ◽  
The Mean ◽  
The Right

Background: Tendoachilles is the chief plantar flexor of the ankle joint. The present study was conducted to find out the possible variations of tendoachilles between the right and the left leg of both male and female.Materials and methods: A cross sectional observational study was conducted in the department of Anatomy, Dhaka Medical College, Dhaka, from July 2013 to June 2014. The data were collected from both the right and the left tendoachilles of 60 human cadavers taken from Anatomy Departments of different Government and Nongovernment Medical Colleges in Dhaka city. Among the 60 cadavers, 30 were male and 30 were female. After dissection, the length of tendoachilles and the breadths at different levels of tendoachilles were measured and recorded.Results: The mean length of tendoachilles was significantly greater in the right than in the left leg of both male and female. The tendoachilles was longer in male than in female in both the right and the left leg (P<0.01). There was significant positive correlation between the height of cadaver and the length of tendoachilles of both the right leg and the left leg in case of male. Positive correlation was also observed between the height of cadaver and the length of tendoachilles of both the legs in case of female, but that was not statistically significant. The mean breadths of tendoachilles were significantly greater in the right leg than in the left leg at its junction with gastrocnemius and at the level of its junction with calcaneus in both male and female and also in male than in female in both legs. Significant difference was observed between the breadth of right and left tendoachilles at the level of 4 cm above its junction with calcaneus in male but not in female (P>0.05).Conclusion: Significantly greater values were observed in the length and in most of the breadths of tendoachilles in the right leg of both sexes and in male in both legs. There was significant positive correlation between the height of cadaver and the length of tendoachilles of both legs in case of male, but, not in female.Bangladesh Journal of Medical Science Vol.17(3) 2018 p.388-394

scholarly journals ANTHROPOMETRIC ASSESSMENT OF DIGIT LENGTHS AND DIGIT RATIOS OFVITILIGO SUBJECTS IN PORT HARCOURT, RIVERS STATE

2021 ◽  
Vol 9 (11) ◽  
pp. 907-911
Author(s):  
Gwunireama I.U. ◽  
◽  
Ogoun T.R. ◽  
Adheke O.M. ◽  
Wariboko L.I. ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Significant Positive Correlation ◽  
The Body ◽  
Positive Correlation ◽  
Left Hand ◽  
Right Hand ◽  
Study Results ◽  
The Mean ◽  
The Right ◽  
The Relationship

Vitiligo is a skin pigmentation disorder that is caused by a loss of melanocytes, characterized by white spots around certain parts of the body. The aim of this study was to investigate the relationship between digit length, digit (2D:4D) ratio and vitiligo among vitiligo patients within a south-southern Nigeria. Informed consents were obtained from 98 vitiligo adult subjects (69 females and 29 males) in the age range of 18 – 50 years. The measurements that were obtained were the digit lengths of second and fourth fingers for both hands using the digital vernier caliper. The mean and standard deviation values were calculated for all measurements. A Pearson correlation was used to analyse the relationship between the various measurements for both hands in the study. Results showed that the mean ± standard deviation of the various parameters for the female category. Right 2D length was 6.67± 7.53cm, left 2D length was 6.68 ± 7.32cm, right 4D length and left 4D length were 6.86 ± 8.57cm and 6.89 ± 8.50cm respectively. While, the mean and standard deviation values for right and left 2D:4D ratios for the female category were 0.98 ± 0.15 and 0.98 ± 0.12 respectively. In the males, right 2D length was 6.66 ± 9.66cm, left 2D length was 6.64 ± 9.86cm, right 4D length and left 4D length were 6.99 ± 10.09cm and 7.03± 10.40cm respectively. While, the mean and standard deviation values for right and left 2D:4D ratios for the male category were 0.95 ± 0.03 and 0.95 ± 0.03 respectively. In the females for the right hand, there was a significant positive correlation between 2D length and 4D length (r = 0.761, p = 0.000) while there was a significant negative correlation between 4D length and digit ratio (r = -0.473, p = 0.000) at p < 0.01. For the left hand, there was a significant positive correlation between 2D length and 4D length (r = 0.783, p = 0.000). In the males for the right hand, there was a significant positive correlation between 2D length and 4D length (r = 0.976, p = 0.000). For the left hand, there was a significant positive correlation between 2D length and 4D length (r = 0.981, p = 0.000).It can be concluded that the knowledge of 2D:4D ratio among vitiligosubjects could be helpful in clinical anthropometry however, more research has to be done considering that the sample size of this study is relatively small.

scholarly journals A Comparative Study of Condylar Guidance Setting Obtained From Interocclusal Records and Panoramic Radiographs in Both Dentulous and Edentulous Subjects

2015 ◽  
Vol 03 (02) ◽  
pp. 085-090
Author(s):  
Sharad Acharya ◽  
Avni Pandey ◽  
Sumit Sethi ◽  
Manoj Meena
Keyword(s):  
Test Results ◽  
Articular Eminence ◽  
Cross Sectional ◽  
Radiographic Images ◽  
Panoramic Radiographs ◽  
Record Group ◽  
Inclination Angles ◽  
Left And Right ◽  
Interocclusal Records

AbstractTo compare the condylar guidance values obtained from interocclusal records and the panoramic radiographs in both dentulous and edentulous subjects. Materials & methods: 20 dentulous and 20 edentulous subjects having specific criteria were selected for the cross-sectional descriptive in-vivo study. In the first method, the sagittal condylar guidance values for both the groups were recorded after obtaining protrusive records using HANAU articulator model Wide-Vue, U.S.A. In the second method panoramic radiographs were made of all the edentulous and dentulous subjects in the natural head position and tracings were done of the outline of glenoid fossa and the articular eminence. The angles formed by the lines drawn were measured and the values obtained were compared with those from the inter-occlusal record method. The condylar guidance readings of both dentulous and edentulous subjects obtained from the interocclusal records and those by tracing panoramic radiographic images were compared by Mann Whitney U test and Karl Pearson’s coefficient of correlation test. Results: The condylar guidance values obtained from the interocclusal records were less when compared to the values obtained from tracing the panoramic radiographs. Significant correlation (r=0.9) between the condylar guidance values obtained for left and right sides in interocclusal record group and a moderate correlation (r=0.65) between the condylar guidance values obtained for left and right sides from panoramic radiographs. Conclusion: The results from this study showed that measurement of condylar inclination angles using panoramic radiographs gave higher values, as compared to the inter-occlusal record method. Also, panoramic radiographic method revealed less difference between the condylar guidance values obtained for left and right sides as compared to the articulator method. Although, significant amount of correlation was found between the two methods, variations due to different operators and better radiographic techniques should be further investigated.

scholarly journals CBCT Assessment of Mental Foramen Position Relative to Anatomical Landmarks

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Mahnaz Sheikhi ◽  
Mitra Karbasi Kheir
Keyword(s):  
Mental Foramen ◽  
Anatomical Landmarks ◽  
Cross Sectional ◽  
Gender And Age ◽  
Significant Difference ◽  
The Mean ◽  
Edentulous Patients ◽  
Inferior Border ◽  
The Right ◽  
Superior Border

Purpose. This study was carried out on an Iranian population aiming to investigate mental foramen position relative to inferior border of mandible and skeletal midline and its gender and age differences on CBCT projections. Materials and Methods. A number of 180 CBCT images of patients were analyzed in different planes (tangential, cross-sectional, and axial). The distances from the superior border of mental foramen to the inferior border of mandible and from the anterior border of mental foramen to the midline were calculated. Results. The mean distance from mental foramen to the inferior border of mandible in the right side was 13.26 mm (SD ± 2.34) and in the left side was 13.37 mm (SD ± 2.19). There was a statistically significant difference between genders in terms of the distance between mental foramen and inferior border of mandible (P value = 0.000). The mean distances from mental foramen to midline were 25.86 mm (SD ± 0.27) and 25.53 mm (SD ± 0.31) in the right and left sides, respectively. Conclusions. The vertical and horizontal positions of mental foramen can be determined from stable anatomical landmarks such as mandibular inferior border and skeletal midline in both dentulous and edentulous patients. The distance from the superior border of mental foramen to the inferior border of mandible exhibited sexual dimorphism.

DMSA-scintigraphy in paediatrics: Is the evaluation of the geometric mean necessary for the calculation of the differential renal function?

2001 ◽  
Vol 40 (04) ◽  
pp. 107-110 ◽  
Author(s):  
B. Roßmüller ◽  
S. Alalp ◽  
S. Fischer ◽  
S. Dresel ◽  
K. Hahn ◽  
...  
Keyword(s):  
Renal Function ◽  
Geometric Mean ◽  
Region Of Interest ◽  
Posterior View ◽  
Renal Abnormality ◽  
Anterior View ◽  
Differential Renal Function ◽  
The Mean ◽  
The Right ◽  
To Receive

SummaryFor assessment of differential renal function (PF) by means of static renal scintigraphy with Tc-99m-dimer-captosuccinic acid (DMSA) the calculation of the geometric mean of counts from the anterior and posterior view is recommended. Aim of this retrospective study was to find out, if the anterior view is necessary to receive an accurate differential renal function by calculating the geometric mean compared to calculating PF using the counts of the posterior view only. Methods: 164 DMSA-scans of 151 children (86 f, 65 m) aged 16 d to 16 a (4.7 ± 3.9 a) were reviewed. The scans were performed using a dual head gamma camera (Picker Prism 2000 XP, low energy ultra high resolution collimator, matrix 256 x 256,300 kcts/view, Zoom: 1.6-2.0). Background corrected values from both kidneys anterior and posterior were obtained. Using region of interest technique PF was calculated using the counts of the dorsal view and compared with the calculated geometric mean [SQR(Ctsdors x Ctsventr]. Results: The differential function of the right kidney was significantly less when compared to the calculation of the geometric mean (p<0.01). The mean difference between the PFgeom and the PFdors was 1.5 ± 1.4%. A difference > 5% (5.0-9.5%) was obtained in only 6/164 scans (3.7%). Three of 6 patients presented with an underestimated PFdors due to dystopic kidneys on the left side in 2 patients and on the right side in one patient. The other 3 patients with a difference >5% did not show any renal abnormality. Conclusion: The calculation of the PF from the posterior view only will give an underestimated value of the right kidney compared to the calculation of the geometric mean. This effect is not relevant for the calculation of the differntial renal function in orthotopic kidneys, so that in these cases the anterior view is not necesssary. However, geometric mean calculation to obtain reliable values for differential renal function should be applied in cases with an obvious anatomical abnormality.

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