scholarly journals Validity of mathematical proportions in maxillary anterior teeth among Bangladeshi population

2017 ◽  
Vol 7 ◽  
pp. 41-48 ◽  
Author(s):  
Monwarul Aziz ◽  
Md. Zakir Hossain
Keyword(s):  
Sample Selection ◽  
Dental Students ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Golden Proportion ◽  
Anterior Teeth ◽  
Age Limit ◽  
Bangladeshi Population ◽  
Natural Dentition ◽  
Dentofacial Orthopedics

Objective To investigate the existence and suitability of mathematical proportions between the widths of maxillary anterior teeth in Bangladeshi population having an esthetic smile, with the aid of digital photographs and computer analysis. Place of Study The study was conducted at the Department of Orthodontics and Dentofacial Orthopedics of Dhaka Dental College and Hospital, Dhaka. Period of Study The study was conducted from April 2016 to September 2016. Sample Selection The study samples collected from Students of Dhaka Dental College, Mirpur-14, Dhaka, Bangladesh, with age limit 18–35 years. Materials and Methods Standardized frontal images of 100 dental students of Dhaka Dental College were captured. All the images were downloaded to a personal computer, and width of each tooth was measured by the scale tool of Photoshop CS version 8.0. All the data were analyzed (through standard statistical method) using Statistical Package for Social Science Software version 20 (IBM Corp., USA). Results The golden proportion existed in 17% of the perceived width ratios of lateral incisor to central incisor and 4% of the width ratios of canine to lateral incisor in natural dentition. Sixty-six percent lateral incisors are following the golden percentage, but only 7% central incisors and 21% canines are following the golden percentage. The recurring esthetic dental (RED) proportion existed in only 4% of participants. Conclusions The golden proportion, golden percentage, and the RED proportion cannot be used as constant proportions to create a harmonious proportion throughout the width of maxillary anterior teeth. The adjusted golden percentage might serve as a guideline to create harmonious proportions in maxillary anterior teeth for Bangladeshi population.

scholarly journals Aesthetic Principles of the Upper Front Teeth: Application of Golden Proportion (Levin) and Golden Percentage (Snow)

2013 ◽  
Vol 59 (1) ◽  
pp. 25-27 ◽  
Author(s):  
Emese Rita Markovics ◽  
Kinga Jánosi ◽  
Carmen Biriș ◽  
Diana Cerghizan ◽  
C Horga ◽  
...  
Keyword(s):  
Computer Program ◽  
Ethnic Differences ◽  
Digital Images ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Golden Proportion ◽  
Digital Photographs ◽  
Anterior Teeth

Abstract Objective: The objective of our work is to examine the presence of the much-discussed golden proportion provided by Levin, and of the golden percentage (Snow), on the widths of maxillary anterior teeth, by measurements made on digital images. Material and method: The material of this study consists of digital photographs taken of subjects with natural and esthetic teeth. We took photos of 68 subjects (35 women and 33 men), between 19 and 26 years. Using a computer program, we made the necesarry measurements, then we made the appropriate calculations of the above theories. Results: The golden proportion between the lateral and central incisor occurs in a higher proportion than between the canine and the lateral incisor. The values obtained by analyzing the golden proportion differ slightly from those proposed by Snow. Conclusions: The frequency of the golden proportion is not significant for the groups of teeth mentioned. With small modifications and taking into consideration ethnic differences, Snow's golden percentage is more valid and applicable than Levin's golden proportion is.

scholarly journals Agenesis of maxillary lateral incisor in an Angle Class II, Division 1 malocclusion patient

2015 ◽  
Vol 20 (5) ◽  
pp. 108-117
Author(s):  
Guilherme Thiesen
Keyword(s):  
Class Ii ◽  
Lateral Incisor ◽  
Occlusal Plane ◽  
Angle Class Ii ◽  
Anterior Teeth ◽  
Angle Class ◽  
Division 1 ◽  
Maxillary Lateral Incisor ◽  
Dentofacial Orthopedics ◽  
Class Ii Division 1

The present case report describes the orthodontic treatment of a patient with agenesis of maxillary left lateral incisor and Angle Class II, Division 1 malocclusion. The patient also presented with maxillary midline deviation and inclination of the occlusal plane in the anterior region. Treatment objectives were: correction of sagittal relationship between the maxilla and the mandible; correction of midline deviation, so as to cause maxillary and mandibular midlines to coincide; correction of overbite and leveling of the occlusal plane, so as to create ideal conditions for esthetic rehabilitation of anterior teeth. This case was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) as a requirement for the title of certified by the BBO.

scholarly journals Nepalese Esthetic Dental (NED) Proportion in Nepalese Population

2017 ◽  
Vol 13 (3) ◽  
pp. 244-249 ◽  
Author(s):  
D. Rokaya ◽  
J. Kitisubkanchana ◽  
A. Wonglamsam ◽  
P. Santiwong ◽  
T. Srithavaj ◽  
...  
Keyword(s):  
Total Population ◽  
Dental Treatment ◽  
Central Incisor ◽  
Golden Proportion ◽  
Anterior Teeth ◽  
Significant Difference ◽  
Golden Standard ◽  
Different Populations ◽  
Facial Types ◽  
One Way Anova

Background Lots of studies on maxillary anterior teeth proportions have been studied in different populations in various countries, but no studies have been conducted in Nepal on the esthetic maxillary anterior teeth proportions.Objective The study was done to investigate the maxillary anterior teeth proportions in a Nepalese population. Teeth proportions in the total population were compared with golden proportion (GP) and golden standard (GS).Method A total of 150 Nepalese subjects were divided in three facial types; broad, average and narrow group. Maxillary anterior teeth were measured from dental casts using digital calipers. The perceived width ratios of lateral to central incisor (LI/CI) and canine to lateral incisor (CN/LI), ratios of mean central incisor length to 2 central incisor widths (CIL/2CIW), and actual width to length ratios (WLRs) (%) were calculated in each facial type and compared. Mean LI/CI, CN/LI and CIL/2CIW in total population were calculated and compared with GP (0.618), and mean WLRs in the total population were compared with GS (80%). All teeth proportions were compared among three facial types. One-sample t-test and one-way ANOVA were performed to analyze the data (α = 0.05).Result The LI/CI, CN/LI, CIL/2CIW and WLRs in three facial types showed no significant difference. The LI/CI, CN/LI and CIL/2CIW in the total population were 66%, 70% and 55% respectively, and were significantly different from GP. The WLRs for CI, LI and CN in the total population were 90%, 86% and 89% respectively and significantly differed from GS. These values were considered to constitute the Nepalese Esthetic Dental (NED) proportion.Conclusion No significant difference of maxillary anterior teeth proportions were observed among three facial types. Teeth proportions in the total population significantly differed from GP and GS. We propose the NED proportion as a guideline for dental treatment in the maxillary anterior region in Nepalese populations.

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 Existence of golden proportion in maxillary anterior teeth of University of Malaya dental students

2010 ◽  
Vol 17 (1) ◽  
pp. 9-14 ◽  
Author(s):  
E. Sulaiman ◽  
M.S. Yaakub ◽  
N.A. Zulkifli ◽  
M. Abdullah ◽  
M.A.G. Gonzalez
Keyword(s):  
Dental Students ◽  
Golden Proportion ◽  
Anterior Teeth

scholarly journals Unilaterally impacted maxillary central incisor and canine with ipsilateral transposed canine-lateral incisor

2013 ◽  
Vol 83 (5) ◽  
pp. 920-926 ◽  
Author(s):  
Po-Sung Fu ◽  
Jen-Chyan Wang ◽  
Yi-Min Wu ◽  
Ta-Ko Huang ◽  
Wen-Cheng Chen ◽  
...  
Keyword(s):  
Functional Outcomes ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Treatment Results ◽  
Maxillary Canine ◽  
Clinical Issue ◽  
Maxillary Central Incisor ◽  
Anterior Teeth ◽  
Maxillary Lateral Incisor ◽  
Treatment Alternatives

ABSTRACT Concurrent impaction and transposition of maxillary anterior teeth is uncommon and poses a challenge for dentists. Early diagnosis and management of eruption disturbances benefits esthetic and functional outcomes. This article describes the treatment of a teenager who had impactions of the left maxillary central incisor and canine as well as ipsilateral canine-lateral incisor transposition. Treatment alternatives and effective orthodontic techniques are delineated. To optimize the treatment results, the impacted maxillary canine was surgically exposed and orthodontically distalized with an innovative cantilever. Subsequently, the deeply impacted maxillary central incisor was uncovered and orthodontically mesialized into the arch. Finally, the displaced maxillary lateral incisor was brought into its normal position. The combined surgical-orthodontic approach resolved a difficult clinical issue and avoided additional restorations. An esthetic, functional outcome was achieved and satisfied the patient.

scholarly journals Clinical Evaluation of Maxillary Anterior Teeth in Relation to Golden Proportion, Red Proportion and Golden Percentage

2018 ◽  
Vol 16 (1) ◽  
pp. 11-15
Author(s):  
Anjana Maharjan ◽  
Sarita Joshi
Keyword(s):  
Sampling Technique ◽  
Health Sciences ◽  
Anterior Tooth ◽  
Lateral Incisor ◽  
Medical Sciences ◽  
Cross Sectional ◽  
Female Population ◽  
Golden Proportion ◽  
Paired Sample ◽  
Anterior Teeth

Background: Golden proportion, recurrent esthetic dental proportion and golden percentage are the widely accepted tools to measure perceived mesiodistal width of maxillary anterior teeth. Our study was aimed to identify appropriate tool among the above mentioned proportion to measure perceived mesiodistal width.Methods: A cross-sectional observational study was conducted in National Academy of Medical Sciences, Bir Hospital, Nepalese Army Institute of Medical Sciences and Patan Academy of Health Sciences between March 2014 to March 2015.Sixty-three respondents were recruited in the study by the convenient sampling technique. Photographs of the maxillary anterior teeth were taken using digital single reflex camera with macrolens. Data analysis was done using SPSS version 17.0 and paired sample t- test was performed.Results: In our study the golden proportion was 14.28% between central and lateral incisor and 12.69% between canine and lateral incisor. Therefore, golden proportion in our scenario doesn’t exist. Recurrent esthetic dental proportion in female Aryans was 71 and 71 on left side and 71and 75 on right side. Golden percentage of respondents was near to values 11, 15, 22, 22, 15, and 12%.Conclusions: Golden percentage is an appropriate anterior tooth proportion which may serve as a guideline for the restoration of anterior tooth. RED proportion is applicable only in Mongoloid female population.

scholarly journals Anatomic crown length and mesio-distal width of maxillary central incisor teeth in Bangladeshi population

2013 ◽  
Vol 2 (1) ◽  
pp. 08-13
Author(s):  
Md Mahfuz Hossain ◽  
Mushfiq Hassan Shaikh ◽  
Md Mahfuzur Raihan ◽  
Md Asif Iqbal Khan
Keyword(s):  
Central Incisor ◽  
Crown Height ◽  
Maxillary Central Incisor ◽  
Anatomy And Physiology ◽  
Crown Length ◽  
Anterior Teeth ◽  
Dental Aesthetics ◽  
The Mean ◽  
Bangladeshi Population ◽  
Oral Anatomy

Background : Dimensions of teeth have been an excellent tool for determining clinically relevant aspects of dental aesthetics. Especially, the anterior teeth crown height and their mesio-distal widths are very important, because of their strategic anatomical position of being in the centre and in the front of the upper jaw. Objectives : The presented study was aimed to find the nominative data of the average anatomic crown height and mesio-distal width of maxillary central incisors of Bangladeshi population irrespective of age and sex. Methods : This observational study was carried out at Update dental college & Hospital. 110 typical extracted human maxillary central incisor teeth were collected randomly from the Oral Anatomy and Physiology Department of Update dental college and Sapporo dental college. Results : In this study it shows that maxillary central incisors’ average crown length is between  7.25 – 11.75 mm and the mean crown length is 10.37(SD±0.90) mm. The average mesio-distal width is between 9.00 – 13.00 mm and the mean mesio-distal width  is 8.51 (SD±0.62) mm. Conclusions : Apart from other specific and objective parameters related to dental aesthetics, these values of mesio-distal width and the length of the maxillary central incisors mentioned in this study will serve as guidelines for the diagnosis and treatment planning, especially in restorative dentistry, orthodontics and periodontal surgeries.DOI: http://dx.doi.org/10.3329/updcj.v2i1.13954 Update Dent. Coll. j: 2012; 2 (1): 08-13

scholarly journals Effect of Subject Rotation on Assessment of Esthetic Dental Ratios: A Simulation Study

2016 ◽  
Vol 2016 ◽  
pp. 1-5
Author(s):  
Rajesh Gyawali ◽  
Prabhat Ranjan Pokharel ◽  
Jamal Giri
Keyword(s):  
Simulation Study ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Anterior Teeth ◽  
Acceptable Range ◽  
Zero Degree ◽  
The Right ◽  
Substantial Change

Objective. This study aimed to find out the change in esthetic ratios during rotation of patient’s head using a simulation.Materials and Methods.A plaster study model was photographed placing its midline along the long axis of the camera. Then a series of photographs were taken by rotating the model each degree till 10° on both right and left sides. These photographs were digitally measured and the ratio of the maxillary anterior teeth at zero-degree rotation was compared with that at various degrees of rotation.Results. As the model was rotated to the right side till 10°, the ratio of the right lateral to central incisor gradually decreased while the ratio of the left lateral to central incisor gradually increased. However, the ratio of the canine to lateral incisor on both sides gradually increased. Similar results were obtained when the model was rotated to the left side. The ratio of the lateral to central incisor deviated from the acceptable range (±10%) when there was rotation of more than 7°, whereas the ratio of the canine to lateral incisor was within the acceptable range till 10° rotation on either side.Conclusions. Rotation of the model by more than 7° leads to a substantial change in the esthetic ratio.

scholarly journals Management of a Class I malocclusion with traumatically avulsed maxillary central and lateral incisors

2018 ◽  
Vol 89 (4) ◽  
pp. 661-671
Author(s):  
Nesrine Z. Mostafa ◽  
Anthony P. G. McCullagh ◽  
David B. Kennedy
Keyword(s):  
Treatment Approach ◽  
Class I ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Deep Bite ◽  
Maxillary Central Incisor ◽  
Orthodontic Space Closure ◽  
Anterior Teeth ◽  
Space Closure ◽  
The Right

ABSTRACT This case report describes orthodontic space closure for managing an avulsed maxillary central incisor and a lateral incisor in a growing girl with a Class I deep bite malocclusion with moderate lower and mild upper crowding. The treatment approach moved a central incisor across the midline and substituted a lateral incisor for a central incisor, in combination with canine substitution. Veneers on all maxillary anterior teeth attained acceptable esthetics. The right central incisor was moved to serve as the avulsed left central incisor. The right lateral incisor was moved to the position of the right central incisor and restored. The canines on both sides were substituted as lateral incisors; the posterior occlusion was left in Class II. Mesialization of central and lateral incisors with prosthetic rehabilitation is an acceptable treatment option.

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