scholarly journals A 2D Photographic and 3D Digital Dental Model Analysis of Golden Percentage in Maxillary Anterior Teeth

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Naseer Ahmed ◽  
Mohamad Syahrizal Bin Halim ◽  
Zuryati Ab Ghani ◽  
Zafar Ali Khan ◽  
Maria Shakoor Abbasi ◽  
...  
Keyword(s):  
Gender Difference ◽  
Significant Gender Difference ◽  
Laptop Computer ◽  
Anterior Teeth ◽  
Dental Model ◽  
Dental Models ◽  
Regional Basis ◽  
Digital Dental Models ◽  
Level Of Significance ◽  
The Right

The objective of this paper was to evaluate the existence of golden percentage in natural maxillary anterior teeth with the aid of 3D digital dental models and 2D photographs. And to propose regional values of golden percentage for restoration of maxillary anterior teeth. For this purpose, one hundred and ninety dentate subjects with sound maxillary anterior teeth were selected. Standardized frontal images were captured with DSLR, and the apparent width of maxillary anterior teeth was measured utilizing a software on a personal laptop computer. Once the dimensions were recorded, the calculations were made according to the golden percentage theory (GPT). The data were analyzed by independent and paired T -test. The level of significance was set at p < 0.05 . The golden percentage values were not found in this study. The values obtained were 16%, 15%, 20%, 20%, 15%, and 16% moving from the right canine to the left canine teeth. There was no significant gender difference in the golden percentage values. Thus, golden percentage should not be used solely for the correction of anterior teeth or for determining dental attractiveness. Emphasis should be given to a range of dental proportion on regional basis.

scholarly journals Accuracy of digital dental models and three-dimensional printed dental models in linear measurements and Bolton analysis

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 180
Author(s):  
William Suryajaya ◽  
Maria Purbiati ◽  
Nada Ismah
Keyword(s):  
Treatment Planning ◽  
Interobserver Reliability ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
3D Printer ◽  
Intraoral Scanner ◽  
Linear Measurements ◽  
Dental Model ◽  
Dental Models ◽  
Digital Dental Models

Background: Due to advances in digital technology, it is possible to obtain digital dental models through intraoral scanning. The stereolithographic data collected from the scanner can subsequently be printed into a three-dimensional dental model in resinic material. However, the accuracy between digital dental models and printed dental models needs to be evaluated since it might affect diagnosis and treatment planning in orthodontic treatment. This study aimed to evaluate the accuracy of digital models scanned by a Trios intraoral scanner and three-dimensional dental models printed using a Formlabs 2 3D printer in linear measurements and Bolton analysis. Methods: A total of 35 subjects were included in this study. All subjects were scanned using a Trios intraoral scanner to obtain digital study models. Stereolithographic data from previous scanning was printed using a Formlabs 2 3D printer to obtain printed study models. Mesiodistal, intercanine, intermolar, and Bolton analysis from all types of study models were measured. The intraclass correlation coefficient was used to assess intraobserver and interobserver reliability. All data were then statistically analyzed. Results: The reliability tests were high for both intraobserver and interobserver reliability, which demonstrates high reproducibility for all measurements on all model types. Most of the data compared between study models showed no statistically significant differences, though some data differed significantly. However, the differences are considered clinically insignificant. Conclusion: Digital dental models and three-dimensional printed dental models may be used interchangeably with plaster dental models for diagnostic and treatment planning purposes. Keywords: Accuracy, 3D printing, digital dental model, printed dental model.

Geometric and Mathematical Proportions and their Relations to Maxillary Anterior Teeth

2006 ◽  
Vol 7 (5) ◽  
pp. 62-70 ◽  
Author(s):  
Mohammed Ali Fayyad ◽  
Kifah Dafi Jamani ◽  
Jamal Aqrabawi
Keyword(s):  
Dental Student ◽  
Golden Proportion ◽  
Anterior Teeth ◽  
Paired Student ◽  
Tooth Width ◽  
The One ◽  
Level Of Significance ◽  
Natural Dentition ◽  
The Right ◽  
Esthetic Dentistry

Abstract Aim One of the critical aspects of esthetic dentistry is creating geometric or mathematical proportions to relate the successive widths of the anterior teeth. The golden proportion, the recurring esthetic dental (RED) proportion, and the golden percentage are theories introduced in this field. The aim of this study was to investigate the existence of the golden proportion, RED proportion, and the golden percentage between the widths of the maxillary anterior teeth in individuals with natural dentition. Methods and Materials Standardized frontal images of 376 dental student smiles were captured. The images were transferred to a personal computer, the widths of the maxillary anterior teeth were measured, and calculations were made according to each of the above mentioned theories. The data were statistically analyzed using paired student T-test (level of significance P<0.05). Results The golden proportion was found to be accurate between the width of the right central and lateral incisors in 31.3% of men and 27.1% of women. The values of the RED proportion were not constant, and the farther the one moves distally from the midline the higher the values. Furthermore, the results revealed the golden percentage was rather constant in terms of relative tooth width. The width of the central incisor represents 23%, the lateral incisor 15%, and the canine 12% of the width of the six maxillary anterior teeth as viewed from the front. Conclusions Both the golden proportion and the RED proportion are unsuitable methods to relate the successive widths of the maxillary anterior teeth. However, the golden percentage theory seems to be applicable to relate the successive widths of the maxillary anterior teeth if percentages are adjusted taking into consideration the ethnicity of the population. Citation Ali Fayyad M, Jamani KD, Aqrabawi J. Geometric and Mathematical Proportions and their Relations to Maxillary Anterior Teeth. J Contemp Dent Pract 2006 November;(7)5:062-070.

scholarly journals Accuracy of digital dental models and three-dimensional printed dental models in linear measurements and Bolton analysis

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 180
Author(s):  
William Suryajaya ◽  
Maria Purbiati ◽  
Nada Ismah
Keyword(s):  
Treatment Planning ◽  
Interobserver Reliability ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
3D Printer ◽  
Intraoral Scanner ◽  
Linear Measurements ◽  
Dental Model ◽  
Dental Models ◽  
Digital Dental Models

Background: Due to advances in digital technology, it is possible to obtain digital dental models through intraoral scanning. The stereolithographic data collected from the scanner can subsequently be printed into a three-dimensional dental model in resinic material. However, the accuracy between digital dental models and printed dental models needs to be evaluated since it might affect diagnosis and treatment planning in orthodontic treatment. This study aimed to evaluate the accuracy of digital models scanned by a Trios intraoral scanner and three-dimensional dental models printed using a Formlabs 2 3D printer in linear measurements and Bolton analysis. Methods: A total of 35 subjects were included in this study. All subjects were scanned using a Trios intraoral scanner to obtain digital study models. Stereolithographic data from previous scanning was printed using a Formlabs 2 3D printer to obtain printed study models. Mesiodistal, intercanine, intermolar, and Bolton analysis from all types of study models were measured. The intraclass correlation coefficient was used to assess intraobserver and interobserver reliability. All data were then statistically analyzed. Results: The reliability tests were high for both intraobserver and interobserver reliability, which demonstrates high reproducibility for all measurements on all model types. Most of the data compared between study models showed no statistically significant differences, though some data differed significantly. However, the differences are considered clinically insignificant. Conclusion: Digital dental models and three-dimensional printed dental models may be used interchangeably with plaster dental models for diagnostic and treatment planning purposes. Keywords: Accuracy, 3D printing, digital dental model, printed dental model.

scholarly journals Comparison of the accuracy of intraoral scans between complete-arch scan and quadrant scan

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Youn-Gyeong Moon ◽  
Kyung-Min Lee
Keyword(s):  
Third Molar ◽  
Careful Consideration ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Posterior Quadrant ◽  
Left Posterior ◽  
The Right ◽  
Best Fit ◽  
Posterior Area

Abstract Objective To compare the accuracy of complete-arch scans and quadrant scans obtained using a direct chairside intraoral scanner. Material and methods Intraoral scans were obtained from 20 adults without missing teeth except for the third molar. Maxillary and mandibular complete-arch scans were carried out, and 4 quadrant scans for each arch were performed to obtain right posterior, right anterior, left anterior, and left posterior quadrant scans. Complete-arch scans and quadrant scans were compared with corresponding model scans using best-fit surface-based registration. Shell/shell deviations were computed for complete-arch scans and quadrant scans and compared between the complete-arch scans and each quadrant scans. In addition, shell/shell deviations were calculated also for each individual tooth in complete-arch scans to evaluate factors which influence the accuracy of intraoral scans. Results Complete-arch scans showed relatively greater errors (0.09 ~ 0.10 mm) when compared to quadrant scans (0.05 ~ 0.06 mm). The errors were greater in the maxillary scans than in the mandibular scans. The evaluation of errors for each tooth showed that the errors were greater in posterior teeth than in anterior teeth. Comparing the right and left errors, the right side posterior teeth showed a more substantial variance than the left side in the mandibular scans. Conclusion The scanning accuracy has a difference between complete-arch scanning and quadrant scanning, particularly in the posterior teeth. Careful consideration is needed to avoid scanning inaccuracy for maxillary or mandibular complete-arch, particularly in the posterior area because a complete-arch scan might have potential error than a quadrant scan.

scholarly journals Prosthodontic Rehabilitation of Patient with Anterior Hyper Function Syndrome

2017 ◽  
Vol 5 (7) ◽  
pp. 1000-1004
Author(s):  
Vesna Korunoska-Stevkovska ◽  
Ljuben Guguvcevski ◽  
Zaklina Menceva ◽  
Nikola Gigovski ◽  
Aneta Nikola Mijoska ◽  
...  
Keyword(s):  
Oral Surgery ◽  
Diagnostic Tools ◽  
Anterior Teeth ◽  
High Incidence ◽  
Hyperplastic Tissue ◽  
Dental Rehabilitation ◽  
Natural Teeth ◽  
Papillary Hyperplasia ◽  
The Right ◽  
Maxillary Region

BACKGROUND: The success of prosthetic rehabilitation in patients with removable dentures depends on the achievement of the aesthetics, phonetics and most of all, proper use in the mastication process. All the patients that receive removable prostheses need a feeding education program. They must cut the food into smaller pieces, extend the length of time necessary for chewing and place the food upon both the right and left sides of the mouth at once. Bilaterally chewing with dentures will contribute to increased efficiency and denture stability during mastication. Using the anterior teeth for biting, as a result of increased pressure on the anterior ridge may lead to the anterior hyperfunction syndrome.CASE REPORT: The patient requested dental rehabilitation in our clinic for prosthetic dentistry two and a half years ago. We examined him and made therapy plan, for complete removable maxillary denture and partial mandibular denture. Besides our instructions for proper use of dentures and necessity for regular controls, his next visit was after two and a half years. He came with enlarged tuberosity and papillary hyperplasia in the pre-maxillary region. After oral surgery treatment (laser removing of hyperplastic tissue) and a healing period of four weeks, we made indirect relining on the upper denture, re-occlusion and re-articulation achieving weak contacts between the lower natural teeth and upper teeth of the complete denture. The patient was advised not to bite food with his anterior teeth, and avoid chewing very hard food which tends to imprint and displace dentures.CONCLUSION: Anterior hyperfunction syndrome with its high incidence is a disease with the need of interdisciplinary therapy approach. Fast diagnosis, thorough clinical examination using all available diagnostic tools, and choosing the right treatment is very challenging.

scholarly journals Accuracy of digital dental models using the low-cost DAVID laser scanner

2019 ◽  
Vol 28 (12) ◽  
pp. 1647-1656
Author(s):  
Olszewski Raphael ◽  
Szyper-Szczurowska Joanna ◽  
Opach Maciej ◽  
Bednarczyk Piotr ◽  
Zapala Jan ◽  
...  
Keyword(s):  
Low Cost ◽  
Laser Scanner ◽  
Dental Models ◽  
Digital Dental Models

scholarly journals Comparing visual acuity in preschool children using the Lea symbols and Sheridan Gardiner charts

2015 ◽  
Vol 74 (1) ◽  
Author(s):  
Aghafekokhian B. Osaiyuwu ◽  
George N. Atuanya
Keyword(s):  
Visual Acuity ◽  
Preschool Children ◽  
Standard Deviation ◽  
Gender Difference ◽  
Statistical Difference ◽  
Significant Gender Difference ◽  
Distance Visual Acuity ◽  
Vital Part ◽  
Nursery Schools

Visual acuity measurement is a vital part of an optometric examination. The purpose of the present study was to compare visual acuity in preschool children using two charts – the Lea symbols chart and the Sheridan Gardiner chart. One hundred and fifty-three preschool children (72 boys and 81 girls) between the ages of 3 and 5 years (mean age and standard deviation 4.23 ± 0.78 years) were recruited from five randomly selected nursery schools. Distance visual acuity was measured monocularly and binocularly after a pre-test was done. An interval of 5 minutes was allowed for testing with both charts. The ages and sexes of each child were documented. Results showed a statistical difference in visual acuities using both charts (p < 0.05). There was also a statistical difference in both charts regarding age. There was no significant gender difference between the results from each chart.

scholarly journals Characteristics and Dynamics of Full Arch Distalization Using Transpalatal Arches with Midpalatal and Interradicular Miniscrews as Temporary Anchorage Devices: A Preliminary Finite Element Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Mashallah Khanehmasjedi ◽  
Sepideh Bagheri ◽  
Vahid Rakhshan ◽  
Mojtaba Hasani
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Orthodontic Appliances ◽  
Element Analysis ◽  
Midpalatal Suture ◽  
Second Molar ◽  
Bodily Movement ◽  
Anterior Teeth ◽  
The Right

Introduction. Miniscrews have proved quite effective in fixed orthodontic treatment. They can be placed in areas like palatal interradicular zones or midpalatal suture. Despite the value of these methods and their ever-increasing use, their characteristics are not assessed before when implanted in palatal interradicular areas or in the midpalatal suture. We aimed to assess, for the first time, the dynamics of full arch distalization using such miniscrews. Methods. A 3D model of maxilla with all permanent dentition was created from a CT scan volume. Tissues were segmented and differentiated. Afterward, miniscrews and appliances were designed, and the whole model was registered within a finite element analysis software by assigning proper mechanical properties to tissues and orthodontic appliances. The full arches were distalized using transpalatal arches with miniscrews as anchorage devices (in two different models). The extents of stresses and patterns of movements of various elements (teeth, miniscrews, appliances, tissues) were estimated. Results and Conclusions. Comparing the two models, it is obvious that in both models, the stress distribution is the highest in the TPA arms and the head of the miniscrew where the spring is connected. In comparison with the displacement in the X-axis, the “mesial in” rotation is seen in the first molar of both models. But there is one exception and that is the “mesial out” rotation of the right second molar. In all measurements, the amount of movement in Model 2 (with palatal interradicular miniscrews) is more than that in Model 1 (with midpalatal miniscrew). In the Y-axis, more tipping is seen in Model 2, especially the anterior teeth (detorque) and the first molar, but in Model 1, bodily movement of the first molar is more evident. Along the Z-axis, the mesial intrusion of the first molar and the distal extrusion of this tooth can be seen in both models. Again, the displacement values are higher in the second model (with interradicular miniscrews). In comparison with micromotion and stress distribution of miniscrews, in Model 1, maximum stress and micromotion is observed at the head of the miniscrew where it is attached to the spring. Of course, this amount of micromotion increases over time. The same is true for Model 2, but with a lower micromotion. As for the amount of stress, the stress distribution in both miniscrews of both models is almost uniform and rather severe.

scholarly journals Assessment of knowledge regarding Nipah virus infection among physicians in a selected tertiary hospital, Rangpur, Bangladesh

2021 ◽  
Vol 8 (12) ◽  
pp. 5771
Author(s):  
Shajeda Azizi ◽  
Khursheda Akhtar ◽  
Shahidullah Azizi ◽  
M. Kariul Islam ◽  
Sajidul Huq ◽  
...  
Keyword(s):  
Nipah Virus ◽  
Tertiary Hospital ◽  
Cross Sectional Study ◽  
Good Knowledge ◽  
Severe Illness ◽  
Cross Sectional ◽  
Face To Face ◽  
Medical College ◽  
Level Of Significance ◽  
The Right

Background: Human Nipah virus (NiV) infection is an emerging zoonotic disease caused by the NiV resulting in severe illness in humans. The physicians can represent a lead role in disease prevention if they have the right knowledge regarding disease. This study aimed to state the assessment of knowledge regarding NiV infection among physicians in a selected tertiary hospital, Rangpur, Bangladesh.Methods: A cross-sectional study was conducted among 211 physicians in Rangpur Medical College and Hospital by pretested structured questionnaire, from January 2020 to December 2020, using a convenient sampling method. Data were collected through face-to-face interviews.Results: The majority of the respondents (69%) were within the 21 to 25 years of age group, mean age was 25±2.9 years where 54% of respondents were female. A questionnaire was comprised of 87 questions regarding knowledge on NiV infection. The findings revealed that 19% had good knowledge, 50% had fair and about 31% had poor level of knowledge regarding NiV infection. Among the respondents, 83% mentioned lack of awareness as a barrier regarding the prevention of NiV infection. Inferential statistics were done at a 95% confidence interval and 5% level of significance. Those who were aged between 21 to 25 years had significantly good knowledge than those who were more than 26 years of age (p=0.002).Conclusions: This study concludes that knowledge of the physicians on NiV infection was at a fair or average level. There is a dire need for the routine integration of the awareness and safety precaution practice among the physicians.

scholarly journals Tratamento de trauma oclusal anterior com pino de fibra de vidro associado à coroa de dissilicato de lítio Anterior occlusal trauma treatment with fiberglass pin associated to lithium disilicate crown

RSBO ◽  
2018 ◽  
Vol 15 (1) ◽  
pp. 66
Author(s):  
Raisa Carolina Hintz ◽  
Rafaela Caramori Saab ◽  
Eugenio Garcia ◽  
Sergio Paulo Hilgenberg ◽  
Leonardo Fernandes da Cunha ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Tooth Color ◽  
Anterior Teeth ◽  
Aesthetic Appearance ◽  
New Treatment ◽  
The Aesthetic ◽  
Aesthetic Dentistry ◽  
The Right ◽  
Dental Whitening ◽  
Treatment Alternatives

Introdução: A aparência estética é uma das preocupações do ser humano, o que leva a uma busca constante por uma estética que expresse harmonia, naturalidade e expressividade. Sendo assim, os procedimentos restauradores têm contribuído positivamente para a resolução dos desafios odontológicos estéticos. Objetivo e relato de caso: Relatar um caso clínico com associação de clareamento dental, confecção de pino intrarradicular e coroa indireta em dissilicato de lítio em que foi devolvida ao paciente a estética desejada. Pacientede 23 anos de idade fraturou o incisivo central superior direito na infância; insatisfeito com a instabilidade de cor do dente, buscou novas alternativas de tratamento. Conclusão: A associação de diferentes tratamentos na Odontologia estética pode apresentar resultados satisfatórios para o restabelecimento estético e funcional de dentes anteriores.Introduction: The aesthetic appearance is one of the human being concerns, leading to constant search for an aesthetic that expresses harmony, naturalness and expressiveness. So, the restorative procedures have contributed positively to overcome the aesthetic dentistry challenges. Objective and case report: Report a clinical case in association to dental whitening, making of intraradicular pin and indirect crown of lithium disilicate when it was returned to the patient the desired aesthetic. A 23 years old patient fractured the right central incisor in the childhood, dissatisfied with the tooth color instability, he looked for new treatment alternatives. Conclusion: The association of different treatments in the aesthetic dentistry might present satisfactory results to the aesthetic and functional reestablishment of anterior teeth.

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