scholarly journals Three-dimensional evaluation of facial asymmetry in association with unilateral functional crossbite in the primary, early, and late mixed dentition phases

2012 ◽  
Vol 83 (2) ◽  
pp. 253-258 ◽  
Author(s):  
Jasmina Primozic ◽  
Giuseppe Perinetti ◽  
Stephen Richmond ◽  
Maja Ovsenik
Keyword(s):  
Multivariate Analysis ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Middle Part ◽  
T Test ◽  
Analysis Of Covariance ◽  
Mixed Dentition ◽  
Data Sets ◽  
Significant Difference ◽  
The Face

ABSTRACT Objective: To assess the degree of facial asymmetry associated with subjects with unilateral functional crossbite (CB) in the primary, early/intermediate, and late mixed dentition phases in comparison with a group of subjects without CB. Subjects and Methods: A group of 234 white subjects, 78 with CB (42 girls and 36 boys) and 156 without CB (73 girls and 83 boys), aged 3.9–11.9, grouped according to the dentition phase, were included. Three-dimensional laser scans of the subjects' faces were used to assess facial asymmetry. For each part of the face two-way multivariate analysis of covariance was performed to assess differences among the subjects, and an independent sample t-test was used to assess the significance of the differences between data sets. Results: Within all dentition phases, the subjects with CB had statistically significantly greater facial asymmetry of the whole face than the subjects without CB, with the greatest values in the lower part of the face (P < .05). In the middle part of the face a significant difference was observed in the mixed dentition phases. Conclusions: Children with unilateral functional CB exhibited a greater facial asymmetry than children without this malocclusion in all the dentition phases herein investigated. The greatest differences were seen for the lower part of the face. Further, facial asymmetry in the middle part of the face became clinically relevant in combination with the transition from primary to mixed dentition phase.

scholarly journals CBCT Comparison of Dentoskeletal Effects of Haas-Type and Hyrax-Type Expanders Using Deciduous Teeth as Anchorage: A Randomized Clinical Trial

2021 ◽  
Vol 11 (15) ◽  
pp. 7110
Author(s):  
Marco Serafin ◽  
Luca Esposito ◽  
Viviana Conti ◽  
Rosamaria Fastuca ◽  
Manuel Lagravère ◽  
...  
Keyword(s):  
Primary Teeth ◽  
Statistical Significance ◽  
Three Dimensional ◽  
T Test ◽  
Mixed Dentition ◽  
Deciduous Teeth ◽  
Palatal Expansion ◽  
Rapid Palatal Expansion ◽  
Clinical Changes ◽  
Skeletal Expansion

The aim of this study was to compare the three-dimensional dentoskeletal effects of Haas-type and Hyrax-type expanders using primary teeth as anchorage for rapid palatal expansion (RPE). Thirty-four subjects in mixed dentition were divided according to their expander’s type: Hyrax (n = 16; 6F, 10M; mean age 8 ± 3 years) or Haas (n = 18; 14F, 4M; mean age 8 ± 2 years). Each patient underwent CBCTs before (T0) and after RPE (T1). Dentoskeletal changes were collected. A paired sample t-test and independent t-test were used to compare each variable within the same group and between groups, respectively, with a 5% significance. The Hyrax group showed an increase in all dentoskeletal parameters; skeletal expansion was significantly increased anteriorly (1.76 mm) and posteriorly (1.93 mm). The greatest dental expansion was observed in the anchorage unit (6.47 mm), about twice as much as permanent molars (3.42 mm). The same statistical significance of Haas group measurements was observed; anteriorly skeletal expansion (2.97 mm) was greater than posteriorly (1.93 mm) and dental expansion was greater on anchored teeth (6.80 mm) than non-anchored teeth (4.57 mm). No statistical significance was observed between Hyrax and Hass groups. CBCT analysis showed that, in RPE, the dental expansion was greater than skeletal expansion. No significant or clinical changes were observed between Hyrax and Haas appliances anchored to primary teeth.

scholarly journals Feasibility of 3-Dimensional Visual Guides for Preparing Pediatric Zirconia Crowns: An In Vitro Study

2020 ◽  
Vol 17 (16) ◽  
pp. 5732
Author(s):  
Ho Yeon Kang ◽  
Hyeonjong Lee ◽  
Yong Kwon Chae ◽  
Seoung-Jin Hong ◽  
Yun Yeong Jeong ◽  
...  
Keyword(s):  
Three Dimensional ◽  
In Vitro Study ◽  
Mixed Dentition ◽  
Preparation Time ◽  
Second Molar ◽  
Significant Difference ◽  
Distal Surface ◽  
Zirconia Crowns ◽  
Tooth Preparation

This study evaluated the feasibility of a tooth preparation guide for prefabricated zirconia crowns (PZCs). Three-dimensional surface data for PZCs of the left maxillary primary first molar and left mandibular primary second molar were obtained using a model scanner. The tooth preparation data were digitally designed to harmonize with the adjacent teeth on the mixed dentition model and visualized using a color-coded map, which presents the required amount of tooth reduction. Twenty participants were recruited for preparing teeth with and without using the tooth preparation guide. The following three parameters were evaluated: tooth preparation time, harmony score, and amount of tooth reduction. The preparation time when using the guide was significantly reduced (p < 0.05), and a significant difference was observed in the harmony scores for the maxillary primary first molar preparation. Furthermore, the amount of tooth reduction was significantly different for both maxillary and mandibular primary molars (p < 0.05) in terms of the occlusal distal surface and buccal line angle in the maxillary primary first molars, and the smooth surfaces, proximal surfaces, and mesial line angles in the mandibular primary second molars. Thus, the results suggest that a tooth preparation guide could facilitate better tooth preparation for PZCs.

Effect of Various Sensory Inputs on Prose Learning

1979 ◽  
Vol 48 (3) ◽  
pp. 843-847
Author(s):  
Thomas N. Dorsel
Keyword(s):  
Multivariate Analysis ◽  
Principal Result ◽  
Visual Input ◽  
Analysis Of Covariance ◽  
Auditory Input ◽  
Sensory Inputs ◽  
Comparison Test ◽  
Multiple Comparison Test ◽  
Significant Difference ◽  
Prose Learning

A pretest-posttest design was used to determine the effects of auditory input, visual input, auditory-visual input, and no input on prose learning. The principal result of a multivariate analysis of covariance combined with a multiple-comparison test was a significant difference in favor of auditory input. This difference seemed to be confined to definition items which were the substance of the input as opposed to application items which were not involved explicitly in the input. A difference between the present study and earlier ones was that a shorter exposure of stimuli was employed in the present study, which may have led to results favoring auditory input in contrast to earlier findings favoring visual input.

scholarly journals Accuracy of Low-Cost Alternative Facial Scanners: A Prospective Cohort Study.

2021 ◽  
Author(s):  
Alexander K. Bartella ◽  
Josefine Laser ◽  
Mohammad Kamal ◽  
Dirk Halama ◽  
Michael Neuhaus ◽  
...  
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Neck Surgery ◽  
Clinical Analysis ◽  
Smart Device ◽  
Data Sets ◽  
Average Deviation ◽  
Technical Improvement ◽  
Data Set ◽  
Significant Difference

Abstract Introduction: Three-dimensional facial scan images have been showing an increasingly important role in peri-therapeutic management of oral and maxillofacial and head and neck surgery cases. Face scan images can be open using optical facial scanners utilizing line-laser, stereophotography, structured light modality, or from volumetric data obtained from cone beam computed tomography (CBCT). The aim of this study is to evaluate, if two low-cost procedures for creating a three-dimensional face scan images are able to produce a sufficient data set for clinical analysis. Materials and methods: 50 healthy volunteers were included in the study. Two test objects with defined dimensions were attached to the forehead and the left cheek. Anthropometric values were first measured manually, and consecutively, face scans were performed with a smart device and manual photogrammetry and compared to the manually measured data sets.Results: Anthropometric distances on average deviated 2.17 mm from the manual measurement (smart device scanning 3.01 mm vs. photogrammetry 1.34 mm), with 7 out of 8 deviations were statistically significant. Of a total of 32 angles, 19 values showed a significant difference to the original 90° angles. The average deviation was 6.5° (smart device scanning 10.1° vs. photogrammetry 2.8°).Conclusion: Manual photogrammetry with a regular photo-camera shows higher accuracy than scanning with smart device. However, the smart device was more intuitive in handling and further technical improvement of the cameras used should be watched carefully.

scholarly journals THE RELATIONSHIP OF CERVICAL VERTEBRAL MATURATION (CVM) STAGE AND ANTEROPOSTERIOR FACIAL DIMENSIONS IN INDONESIAN POPULATION

2020 ◽  
Vol 5 (2) ◽  
pp. 66
Author(s):  
MAHINDRA AWWALUDIN ROMDLON ◽  
Setiadi W Logamarta ◽  
Yulia Anggraeni
Keyword(s):  
Cervical Vertebrae ◽  
T Test ◽  
Growth Spurt ◽  
Test Results ◽  
Bone Maturation ◽  
Male And Female ◽  
Significant Difference ◽  
The Face ◽  
Male Subjects ◽  
Female Subjects

Background: Growth and development are two different but interrelated and difficult to separate factors. The growth spurt in boys is different from girls. Facial growth is closely related to overall body growth, one of which is the growth of the cervical vertebrae. Objective: The objective of this study was to determine the anteroposterior dimensions of the face based on the maturation levels of cervical vertebrae in 12-14 years old children. Method: Quantitative research using an analytic observational method with a cross-sectional approach was conducted on 21 boys and 21 girls. Measurement of anteroposterior facial length (S-A' and PTM-A) and assessment of cervical vertebral bone maturation level using the Hassel and Farman method. Results: Independent t-test results showed that there was a significant difference (p <0.05) in facial length (S-A') between male and female subjects at all maturation levels of cervical vertebrae. There was a significant difference (p <0.05) in facial length (S-A') based on the maturation level of the cervical vertebrae (CVMS) in male subjects. Independent t-test results showed that there was a significant difference in facial length (PTM-A) based on the maturation level of cervical vertebrae in female subjects (p <0.05). Conclusion: There was a difference in facial length (S-A ') between male and female subjects at all maturation levels of the cervical vertebrae. There is a difference in facial length (S-A') based on the maturation level of the cervical vertebrae (CVMS) in male subjects. There are differences in anteroposterior facial length (PTM-A) based on the maturation level of the cervical vertebrae in female subjects. There is a relationship between the maturation level of the cervical vertebrae with the anteroposterior dimensions of the face S-A' and PTM-A in male subjects.

scholarly journals A novel method using 3D CBCT to assess anterior malar prominence among native Bangalore population- A descriptive study

2021 ◽  
Vol 7 (3) ◽  
pp. 223-228
Author(s):  
Sanda Aamani ◽  
Hemanth M ◽  
Sharmada B K ◽  
Karthik J Kabbur ◽  
Goutham Kalladka
Keyword(s):  
Descriptive Study ◽  
T Test ◽  
Linear Measurements ◽  
Mean Values ◽  
Significant Difference ◽  
The Face ◽  
Novel Method ◽  
Males And Females ◽  
The Mean ◽  
Paired T Test

There is a lack of accurate three-dimensional studies to locate malar prominence for specified population, this study aims to locate the malar prominence using stable landmarks using CBCT. To derive a novel method to accurately locate the malar prominence and to assess and compare the malar prominence between males and females among Bangalore population using 3D CBCT study. All CBCT scans of study subjects belong to Bangalore population were collected from the pre-existing data available in Radiology imaging Solutions (CBCT centre), Bangalore during the period of September 10th to October 10th 2020. This is a descriptive study. A total of 42 subjects including 21 Males and 21 females were assessed using full skull CBCT scans which were converted to DICOM format and reconstructed into 3D images using NEMOCEPH 3D software. Landmarks used to locate the malar prominence were Fzs, Z, Zm and Ans. The intersection of these landmarks is considered to be as constructed maxillozygion(My). For the accuracy of the constructed Maxillozygion point (My), the distance between the actual Maxillozygion (Mzy) and constructed Maxillozygion (My) is measured and calculated between left and right halves of males and females. Three Orthogonal planes constructed were Midsagittal, Axial and Coronal Planes and the linear measurements with reference to all three reference planes in both the groups are measured. Student paired t- Test, Independent Student t Test, Mann Whitney Test. The mean distance from Mzy and my between right and left half of the face was compared using student paired t- Test. There is no significant difference (p=0.35).The mean values of the constructed anatomical landmark (maxillozygion) coordinated to three orthogonal planes between right and left sides of the face is compared using student paired T test and for both the genders (males and females) was compared using Independent Student t Test, and it is significantly higher in males as compared to females and it is statistically significant at (p=0.01). The location of malar prominence using CBCT by a novel method for Bangalore population is found which can be helpful in diagnosis and treatment planning for malar augmentation, camouflage treatment in subjects with midface deficiencies.

scholarly journals Using ePortfolio-based Learning Approach to Facilitate Knowledge Sharing and Creation of College Students

2017 ◽  
Author(s):  
Chi-Cheng Chang ◽  
Pao-Nan Chou ◽  
Chaoyan Liang
Keyword(s):  
College Students ◽  
Multivariate Analysis ◽  
Knowledge Sharing ◽  
T Test ◽  
Analysis Of Covariance ◽  
Control Group ◽  
Learning Approach ◽  
Before And After ◽  
Group A ◽  
Experimental Group

The purpose of the present study was to examine the effects of the ePortfolio-based learning approach (ePBLA) on knowledge sharing and creation with 92 college students majoring in electrical engineering as the participants. Multivariate analysis of covariance (MANCOVA) with a covariance of pretest on knowledge sharing and creation was conducted for examining differences in knowledge sharing and creation between an experimental group (a total of 47 participants using ePBLA) and a control group (a total of 45 participants not using ePBLA or creating eportfolio). A t-test was also performed for examining the differences in knowledge sharing and creation of the experimental group before and after using ePBLA. The results showed that: a) the experimental group had significantly better knowledge sharing and creation than the control group; and b) the experimental group had significantly better knowledge sharing and creation after using ePBLA. The results implied that ePBLA facilitated knowledge sharing and creation. Furthermore, relationships between knowledge sharing and creation were also enhanced by the use of ePBLA

The Impact of Facial Asymmetry on the Surgical Outcome of Crooked Nose: A Case Control Study

2020 ◽  
Author(s):  
Shayan Dasdar ◽  
Nika Kianfar ◽  
Mohammad Sadeghi ◽  
Babak Saedi
Keyword(s):  
Subjective Evaluation ◽  
Facial Asymmetry ◽  
Anthropometric Measurements ◽  
P Value ◽  
Facial Soft Tissue ◽  
Crooked Nose ◽  
Visual Presence ◽  
Significant Difference ◽  
The Face ◽  
The Impact

Abstract Background Facial asymmetry is considered as a reason for the patients’ dissatisfaction with the outcome of rhinoplasty. Objectives The aim of this study was to evaluate the impact of facial asymmetry on the patients’ post-operative satisfaction with crooked nose and to investigate the relationship between visual perception of asymmetry and anthropometric measurements. Methods In this retrospective study, 61 rhinoplasty patients with crooked noses were assessed. Using frontal view photos, pre- and post-operative nasal deviation angles were calculated. The patients were divided into two groups based on the visual presence of facial asymmetry. Moreover, anthropometric characteristics of the face were evaluated using facial soft tissue landmarks. The patients’ satisfaction with surgery outcomes, including both aesthetic and functional aspects, was assessed using the Persian version of the Standardized Cosmesis and Health Nasal Outcomes Survey (SCHNOS). Results Based on the observations, 19 (30.2%) and 44 (69.8%) patients had I-type and C-type noses, respectively. In both groups, the deviation angle decreased significantly post-operatively (p-value&lt;0.001). Regarding the subjective evaluation of facial asymmetry, 22 (34.9%) and 41 (65.1%) cases had symmetric and asymmetric faces, respectively. The anthropometric measurements were also consistent with visual assessments of asymmetry. The satisfaction scores were significantly higher after surgery in all patients; however, there was no significant difference in the mean aesthetic improvement between symmetric (15.83 ± 2.68) and asymmetric faces (15.23 ± 4.46) (P-value: 0.531). The power of study was 97.8%. Conclusions Rhinoplasty in patients with deviated noses and asymmetric faces may have comparable results with symmetric ones.

scholarly journals Three-dimensional face recognition using variance-based registration and subject-specific descriptors

2019 ◽  
Vol 16 (3) ◽  
pp. 172988141985171 ◽  
Author(s):  
Naeem Iqbal Ratyal ◽  
Imtiaz Ahmad Taj ◽  
Muhammad Sajid ◽  
Nouman Ali ◽  
Anzar Mahmood ◽  
...  
Keyword(s):  
Face Recognition ◽  
Three Dimensional ◽  
Recognition Algorithm ◽  
Superior Performance ◽  
Data Sets ◽  
Face Images ◽  
Subject Specific ◽  
The Face ◽  
The Subject ◽  
Depth Curves

Face recognition underpins numerous applications; however, the task is still challenging mainly due to the variability of facial pose appearance. The existing methods show competitive performance but they are still short of what is needed. This article presents an effective three-dimensional pose invariant face recognition approach based on subject-specific descriptors. This results in state-of-the-art performance and delivers competitive accuracies. In our method, the face images are registered by transforming their acquisition pose into frontal view using three-dimensional variance of the facial data. The face recognition algorithm is initialized by detecting iso-depth curves in a coordinate plane perpendicular to the subject gaze direction. In this plane, discriminating keypoints are detected on the iso-depth curves of the facial manifold to define subject-specific descriptors using subject-specific regions. Importantly, the proposed descriptors employ Kernel Fisher Analysis-based features leading to the face recognition process. The proposed approach classifies unseen faces by pooling performance figures obtained from underlying classification algorithms. On the challenging data sets, FRGC v2.0 and GavabDB, our method obtains face recognition accuracies of 99.8% and 100% yielding superior performance compared to the existing methods.

scholarly journals Análise da marcha de crianças com paralisia cerebral com e sem uso de órteses de tornozelo e pé

2018 ◽  
Vol 28 (2) ◽  
pp. 29390
Author(s):  
Daiane Bridi ◽  
Ingrid Corso Cavião ◽  
Vinícius Mazzochi Schmitt ◽  
Raquel Saccani ◽  
Leandro Viçosa Bonetti ◽  
...  
Keyword(s):  
Cerebral Palsy ◽  
Three Dimensional ◽  
T Test ◽  
Gait Velocity ◽  
Foot Orthoses ◽  
Mean Velocity ◽  
Significant Difference ◽  
Children With Cerebral Palsy ◽  
The Mean ◽  
Ankle And Foot

AIMS: To analyze the linear parameters of the gait of children with spastic hemiparetic cerebral palsy, users of articulated ankle and foot orthoses.METHODS: A three-dimensional analysis of the gait of eight children with spastic hemiparetic cerebral palsy, aged 5 to 10 years, classified in levels I and II of the Gross Motor Function Classification System, was made with and without the use of ankle and foot orthoses. A kinematic system with seven integrated cameras captured the three-dimensional trajectory of markers in the participants' body during gait, with data being collected at a sampling rate of 100 Hz. For the comparisons, the paired t-test and the t-test for a sample were used.RESULTS: Considering the gait’s spatiotemporal variables of these children with cerebral palsy compared to normal values, only velocity (with the orthosis and without the orthoses) presented a statistically significant difference. The mean normal gait velocity is 1.25 m/s, while in the non-orthoses participants the mean velocity was 0.98±0.10 m/s (p=0.0001) and with the use of orthoses the mean velocity was 0.96±0.21 m/s (p=0.0001). In the comparison between children using or not the ankle and foot orthoses, velocity, cadence and pitch length were respectively 0.98±0.10 m/s, 131±16.15 steps/min and 0.44±0.08 m in the children without the orthoses; and 0.96±0.21 m/s, 128.37±22.9 steps/min and 0.48±0.05 m in the children with the orthoses. The differences were not statistically significant.CONCLUSIONS: Comparison between the same group with and without the use of ankle and foot orthoses suggests that their use in children with cerebral palsy may promote an increase in step length and a decrease in velocity and cadence in relation to condition without orthosis, favouring a better distribution of weight in the paretic member and providing a better symmetry in gait. However, the differences were not statistically significant. Thus, it is expected that the results obtained in this study can serve as a pilot for future research, with larger samples.

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