scholarly journals 3D Morphometric Analysis of Human Primary Second Molar Crowns and Its Implications on Interceptive Orthodontics

2021 ◽  
Vol 18 (12) ◽  
pp. 6201
Author(s):  
Alessandro Nota ◽  
Vincenzo Quinzi ◽  
Federico Floriani ◽  
Clizia Cappelli ◽  
Simona Tecco ◽  
...  
Keyword(s):  
Reference Data ◽  
Mean Value ◽  
Mixed Dentition ◽  
Second Primary ◽  
Primary Molar ◽  
Second Molar ◽  
Interceptive Orthodontics ◽  
Left And Right ◽  
The Mean ◽  
The Right

The second primary molar represents an anchorage element in interceptive orthodontics. The present study aims to analyze the 3D morphology of primary second molars in order to provide reference data and implications about the development of orthodontic bands for second primary molars. Digital models of dental arches from 150 subjects in primary or mixed dentition were analyzed. Six dimensional variables were digitally measured for each second primary molar, and the mean and standard error of the mean (SEM) were calculated and compared applying Student t-test statistical analysis. The mean value results show statistically significant dimensional differences between the upper and lower teeth, (mostly p < 0.0001), except for the variable h1, while only the variable h1 showed significant differences between the antimetric teeth (left and right). The dimensional variations between the right and left molars were considerably minor compared to those found by comparing the upper and lower arches. A significantly higher dimension of the lower molars and a more rectangular shape were observed.

scholarly journals Cementoblastoma Relating to Right Mandibular Second Primary Molar

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Sivakumar Nuvvula ◽  
Swapna Manepalli ◽  
Abinash Mohapatra ◽  
Sreekanth Kumar Mallineni
Keyword(s):  
Benign Lesion ◽  
Panoramic Radiograph ◽  
Second Primary ◽  
Mineralized Tissue ◽  
Primary Molar ◽  
Second Molar ◽  
Distal Surface ◽  
Blast Cells ◽  
The Right

Cementoblastoma is a benign lesion of the odontogenic ectomesenchymal origin. It rarely occurs in primary dentition. This report describes a case of a cementoblastoma relating to the right mandibular second primary molar in a 7-year-old girl. Her panoramic radiograph revealed a well-defined radiopaque lesion with a radiolucent border extending from the distal surface of the mandibular right first primary molar to the distal surface of mandibular second primary molar. The tumor was attached to the mesial root of primary second molar and was excised along with the teeth involved and sent for histopathological evaluation, which showed irregular trabeculae of mineralized tissue interspersed with fibrovascular connective tissue, trabeculae of mineralized tissue with prominent reversal lines, and peripheral rimming of the mineralized tissue with blast cells. On a six-month follow-up, there has been no recurrence of the lesion.

Resorption of multirooted temporary teeth in children with dentofacial anomalies in accordance with the orthopantomography data

2020 ◽  
Vol 20 (3) ◽  
pp. 235-241
Author(s):  
F. S. Ayupova ◽  
S. N. Alekseenko ◽  
V. Ya. Zobenko ◽  
T. V. Gayvoronskaya
Keyword(s):  
Primary Teeth ◽  
Root Resorption ◽  
Type A ◽  
Mixed Dentition ◽  
Permanent Teeth ◽  
Primary Molars ◽  
Second Primary ◽  
X Rays ◽  
Primary Molar ◽  
Posterior Teeth

Relevance. To study the incidence of different types of resorption of multirooted primary teeth, to specify indications for deciduous molar extraction to prevent eruption abnormalities of permanent posterior teeth in mixed dentition.Materials and methods. Root resorption of 375 multirooted primary teeth (166 first primary molars and 209 second primary molars) was studied on panoramic X-rays of 60 children (30 girls and 30 boys) aged between 7 and 15. Illustrated classification by T.F. Vinogradova (1967) improved by authors was used to determine type and degree of root resorption of multi-rooted primary teeth. Received data were described with absolute values of number of cases and percentage. Chi-square was used to detect differences in sign incidence rate between groups, p<0.05 was considered statistically significant.Results. There were no statistically significant gender differences (p>0,05) in type and degree of root resorption of multirooted primary teeth. Type A resorption prevailed and constituted 53.3% of all primary molars. Disturbances in root resorption of multirooted primary teeth in mixed dentition were related to health condition of primary teeth. Transition of even resorption to unven was considered a risk factor of delayed eruption and aberrant position of permanent teeth, and indication for extraction of a primary molar in question. Conclusions. 1) Even root resorption (type A) was detected in 53.3% of primary molars in mixed dentition by orthopantomography. 2) Transition from even resorption of primary molar roots to uneven resorption was associated with eruption deviations and delayed premolar eruption. 3) Timely extraction of primary molars with uneven root resorption facilitated correct eruption of premolars and increased effectiveness of secondary prevention of malocclusion in children.

scholarly journals The effect of nano-hydroxyapatite/chitosan scaffolds on rat calvarial defects for bone regeneration

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Emmanouil Chatzipetros ◽  
Spyros Damaskos ◽  
Konstantinos I. Tosios ◽  
Panos Christopoulos ◽  
Catherine Donta ◽  
...  
Keyword(s):  
Bone Regeneration ◽  
Mean Value ◽  
Parietal Bone ◽  
Female Rats ◽  
Sprague Dawley ◽  
Post Surgery ◽  
Group A ◽  
The Mean ◽  
Group B ◽  
The Right

Abstract Background This study aims at determining the biological effect of 75/25 w/w nano-hydroxyapatite/chitosan (nHAp/CS) scaffolds on bone regeneration, in terms of fraction of bone regeneration (FBR), total number of osteocytes (Ost), and osteocyte cell density (CD), as well as its biodegradability. Methods Two critical-size defects (CSDs) were bilaterally trephined in the parietal bone of 36 adult Sprague-Dawley rats (18 males and 18 females); the left remained empty (group A), while the right CSD was filled with nHAp/CS scaffold (group B). Two female rats died postoperatively. Twelve, 11, and 11 rats were euthanized at 2, 4, and 8 weeks post-surgery, respectively. Subsequently, 34 specimens were resected containing both CSDs. Histological and histomorphometric analyses were performed to determine the FBR, calculated as [the sum of areas of newly formed bone in lateral and central regions of interest (ROIs)]/area of the original defect, as well as the Ost and the CD (Ost/mm2) in each ROI of both groups (A and B). Moreover, biodegradability of the nHAp/CS scaffolds was estimated via the surface area of the biomaterial (BmA) in the 2nd, 4th, and 8th week post-surgery. Results The FBR of group B increased significantly from 2nd to 8th week compared to group A (P = 0.009). Both the mean CD and the mean Ost values of group B increased compared to group A (P = 0.004 and P < 0.05 respectively). Moreover, the mean value of BmA decreased from 2nd to 8th week (P = 0.001). Conclusions Based on histological and histomorphometric results, we support that 75/25 w/w nHAp/CS scaffolds provide an effective space for new bone formation.

Aspects quantitatifs du peuplement des gonades par les cellules germinates chez l'embryon de Caille (Coturnix coturnix japonica)

Development ◽  
1976 ◽  
Vol 35 (3) ◽  
pp. 637-648
Author(s):  
Par Eliane Didier ◽  
Noël Fargeix
Keyword(s):  
Germ Cells ◽  
Primordial Germ Cells ◽  
Mean Value ◽  
Coturnix Japonica ◽  
Coturnix Coturnix Japonica ◽  
Quail Embryo ◽  
Coturnix Coturnix ◽  
The Mean ◽  
Regular Increase ◽  
The Right

Quantitative aspects of the colonization of the gonads by germ cells in the quail embryo (Coturnix coturnix japonica) A quantitative analysis made on quail embryos coming from 13 isolated parent couples reveals some significative variations of a genetic origin, between some of the off spring studied: the differences observed concern both the quantitative importance of the colonization of gonads by germ cells and the asymmetrical distribution of PGCs (primordial germ cells) between the two genital ridges. The chronological study of the colonization in the quail shows, as in both the duck and the chick, two periods of rapid and regular increase of the number of gonadic PGC, at stages from 13 to 18 and from 24 to 30 of Hamburger & Hamilton. The distribution of germ cells between the two genital ridges is, at the beginning of the colonization, not very asymmetrical. Between stages 18 and 24 the asymmetry increases and remains stable so that the mean value of D % (percentage of the number of PGC contained in the right gonad) from that moment on is equal to 29–34 %. This value is specific for the quail embryo.

Postnatal Development of a Left-Right Atrial Pressure Gradient

1956 ◽  
Vol 186 (3) ◽  
pp. 521-524 ◽  
Author(s):  
A. van Harreveld ◽  
F. E. Russell
Keyword(s):  
Left Ventricle ◽  
Pressure Gradient ◽  
Left Atrium ◽  
Postnatal Development ◽  
Right Atrial ◽  
Left And Right ◽  
The Mean ◽  
The Right ◽  
The Relationship ◽  
Equal Thickness

The mean left and right atrial pressures were measured in six groups of 10 kittens each. One group was examined between the 12th and 24th hour after birth, one group after 3 days, after 1 week, 2 weeks, 1 month and 2 months. The left and right atrial pressures were almost equal in the first group. With age an increasing left to right pressure gradient developed. In the oldest group the pressure in the left atrium was almost twice as great as in the right. Parallel with the pressure gradient a difference developed in the wall thicknesses of the left and right ventricles. At birth the ventricular walls were of about equal thickness; at age 2 months the left ventricle wall was more than twice as thick as the right. The relationship between ventricle wall thicknesses and atrial pressures is discussed.

scholarly journals Growth-Related Differences in Maximum Laterotrusion and Retrusion between Children and Adults

2009 ◽  
Vol 79 (2) ◽  
pp. 265-270 ◽  
Author(s):  
Claudia A. Reicheneder ◽  
Peter Proff ◽  
Uwe Baumert ◽  
Tomas Gedrange
Keyword(s):  
Temporomandibular Joint ◽  
Null Hypothesis ◽  
Population Based ◽  
Adult Group ◽  
Population Based Study ◽  
Significant Difference ◽  
Left And Right ◽  
The Mean ◽  
The Right

Abstract Objective: To test the null hypothesis that there are no differences between children and adults in maximum laterotrusion and maximum retrusion on the right and left sides. Materials and Methods: This population-based study included 81 randomly selected children between the ages of 6 and 10 years and 67 adults. Kinematic variables were measured with the ultrasonic JMA-System for registration. Results: The mean maximum laterotrusion of the children's group (10.6 ± 1.5 mm on the left, 11.0 ± 1.7 mm on the right) was significantly smaller than that of the adult group (11.7 ± 2.0 mm on the left, 12.2 ± 1.7 mm on the right). The maximum laterotrusion of the children's group corresponded to about 90% on the left and right sides of that of the adult group. The mean maximum retrusion of the children's group was significantly bigger than that of the adult group. There, the adult values corresponded to 66.7% on the left and 50% on the right side of the children's values. No significant difference in maximum laterotrusion and retrusion was noted on the right and left sides, and no significant differences according to gender specificities were observed in either group. Conclusions: The hypothesis is rejected. In development of the temporomandibular joint, maximum laterotrusion on the right and left sides increases significantly with age, and maximum retrusion decreases significantly with age.

scholarly journals PENGARUH METODE WAFA TERHADAP KEMAMPUAN ANAK MEMBACA AL-QUR’AN DI MI AL-HIDAYAH MANGKUJAJAR KEMBANGBAHU LAMONGAN

2019 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
Musa'adatul Fithriyah
Keyword(s):  
Elementary Education ◽  
Mean Value ◽  
T Test ◽  
Paired Sample ◽  
Analysis Techniques ◽  
A Value ◽  
Post Test ◽  
Experimental Type ◽  
The Mean ◽  
The Right

The Qur'an learning is very fundamental in Islamic education, especially in elementary education. The Qur'an is one of the subjects that must be taught to children. Early education in the Qur'an is expected to produce young people having a strong mental foundation, education not only makes children as prosperous in the world, but also provides sufficient provisions to both improve their religion and practice their scriptures. To be able to practice the Holy Qur'an correctly, children must be guided and taught how to read the Qur'an properly in accordance with the rules of true recitation. In fact the Qur'an learning at MI AL-Hidayah Mangkujajar Kembangbahu Lamongan initially tended to be monotonous for being dominated by conventional learning methods. As a result,  the Qur'an learning only produced generations that could read the Qur'an with the average ability without any sense of love and closeness to the Qur'an instead of having enthusiasm in learning it well. As time goes by, the Qur'an learning at MI Al-Hidayah has increasingly developed by applying the so-called Wafa method. This method teaches children to be able to read and memorize the Qur'an by maximizing the right brain. This is classified as a new method, but it is quite practical and fun in the learning process. The research was aimed at determining the effect of the Wafa method on the ability of children to read the Qur'an at MI Al-Hidayah Mangkujajar Kembangbahu Lamongan. The research method is quantitative with the experimental type of one group pretest-post test, data analysis techniques use the mean pretest and posttest, in addition, to testing the hypothesis it uses the Paired Sample T-Test with the SPSS 16. The results showed the influence of the Wafa method on the children ability to read the Qur'an at MI Al-Hidayah Mangkujajar Kembangbahu Lamongan. It was proven from the results of the analysis through the mean pretest formula, it was obtained a value of 82.92 and increased in the acquisition of the mean value of posttest amounted to 85.75. In addition, in the Paired Sample T-Test based on significance values with SPSS 16, it is known that the Sig. (2-tailed) value is 0,000 <0,05, because sig. (2-tailed) of 0,000 is smaller than 0.05, then the hypothesis is accepted and it could be concluded that there is an influence of the WAFA Method on the ability to read the Qur'an at MI Al-Hidayah Mangkujajar Kembangbahu Lamongan.

scholarly journals Association of the dominant handgrip strength with the hand dimensions of adult Bangladeshi female laborers

2021 ◽  
Vol 7 (3) ◽  
pp. 230-237
Author(s):  
Mst Taslima Akter ◽  
Nahid Farhana Amin ◽  
Ahsan Arif
Keyword(s):  
Muscle Function ◽  
Handgrip Strength ◽  
Work Force ◽  
Mean Value ◽  
The Body ◽  
Digital Slide ◽  
Daily Work ◽  
The Mean ◽  
The Right ◽  
Hand Length

The handgrip strength determines the overall physical health and muscle function of the hand. Nowadays in Bangladesh, female laborers are an important source of work force in many industries. Laborers require more handgrip strength to perform their daily work efficiently. Besides, hand is the part of the body that directly related with handgrip strength, so, the hand dimensions are deemed essential to investigate. Therefore this study is to investigate the association of the dominant handgrip strength with the hand dimensions like hand length, hand breadth, hand span, palm length, palm breadth and wrist breadth of adult Bangladeshi female laborers. Hundred (100) adult female laborers aged between 18 to 45 years, residing in different slums in Dhaka city of Bangladesh were the participants of the present research. Six selected hand dimensions of the right side were measured using the digital slide caliper by direct physical procedure and dominant handgrip strength was measured using a digital handgrip dynamometer. The associations of the dominant handgrip strength with the selected six hand dimensions were tested using Pearson’s correlation coefficient test. The mean value of the dominant handgrip strength of the laborers was 25.6 kg. In present research, the dominant handgrip strength was positively associated with the six selected hand dimensions (hand length, hand breadth, hand span, palm length, palm breadth and wrist breadth). However, the association of dominant handgrip strength with the breadth of hand, palm and wrist reached up to significant level individually. Besides, to get desired success in work of a female laborer, it is important to see the hand anthropometry and handgrip strength, because, better handgrip strength lead to better performance in work. Asian J. Med. Biol. Res. 2021, 7 (3), 230-237

Objective cyclodeviation measurement in normal subjects by means of Cyclocheck® application

2020 ◽  
pp. 112067212090531
Author(s):  
Justyna Simiera ◽  
Agata Joanna Ordon ◽  
Piotr Loba
Keyword(s):  
Normal Subjects ◽  
Mean Value ◽  
Angle Measurements ◽  
Corrected Visual Acuity ◽  
Normal Individuals ◽  
Muscle Balance ◽  
Study Population ◽  
The Mean ◽  
Fundus Photographs ◽  
The Right

Purpose: To evaluate the range of cyclodeviation in normal individuals by means of Cyclocheck® application recently designed by the authors and freely available at www.cyclocheck.com . Methods: Healthy subjects with normal muscle balance, best-corrected visual acuity of ⩾0.8, and stereopsis on Randot charts of ⩽100 s of arc were included in the study. Two separate digital fundus photographs were taken of each eye of every patient. The disk-foveal angle was calculated using the Cyclocheck® application. The average result of the disk-foveal angle measurements were considered for data analysis. Results: A total of 131 patients met inclusion criteria for the study population. The mean value of the disk-foveal angle in the whole study group (both right and left eye) was 6.39° ± 2.72° with 5.26° ± 2.56° (range from −0.4° to 12.55°) in the right eye and 7.52° ± 2.39° (range from 1.25° to 12.76°) in the left eye. The mean value of the disk-foveal angle of the left eye was greater by 2.26° than that of the right eye. Conclusion: Cyclocheck® software allows easy assessment of cyclodeviation. Normal individuals present with a positive value of the disk-foveal angle with a certain spread of the results. The analysis of obtained measurements revealed a significant asymmetry between both eyes with the left eye being more excyclodeviated in an otherwise orthotropic population, which remains a subject for further investigations.

scholarly journals A Study on Measurements of Different Dimensions of Maxillary Sinus by Computed Tomography in Adult Nepalese Population

2018 ◽  
Vol 8 (2) ◽  
pp. 8-12
Author(s):  
Umesh Prasad Khanal ◽  
Anupama Adhikari ◽  
Mukunda Prasad Humagain
Keyword(s):  
Computed Tomography ◽  
Maxillary Sinus ◽  
Anterior Wall ◽  
Mean Value ◽  
Forensic Sciences ◽  
P Value ◽  
Male Population ◽  
Different Dimensions ◽  
Left And Right ◽  
The Mean

Introduction: Measurement of different dimensions of maxillary sinus and anterior wallthickness of maxillary sinus by Computed Tomography in normal Nepalese populationMethods: Dimensions of 90 patients were measured in CT PNS using Syngovia Software. AP diameter, width and anterior wall thickness were measured in axial images and height was measured in coronal images.Results: The mean volume of maxillary sinuses in study of male population on left and right side were 17.09 cm3±3.89, 17.19 cm3 ±4 respectively whereas in female were 15.64 cm3±3.5 and 15.21cm3±3.2 respectively as shown in Table 1. This shows the volume of male was significantly larger than female with P- Value = 0.012 (<0.05). Similarly, the thickness of Anterior Wall (AW) of maxillary sinus was also measured in this study and the mean value of left and right side in male were 0.16cm± 0.04 and 0.15cm± 0.03 respectively and in female were 0.12cm± 0.04 and 0.14cm± 0.02 respectively.Conclusion: This study showed that CT is a reliable method for the measurement of different dimensions of the maxillary sinus. The result showed greater mean value of volume in male than female with significant differences. So this study concluded that the measurement of volume of maxillary sinus can help in the identification of gender which can be very useful for forensic sciences.

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