scholarly journals Analysis of colorimetric parameters of international commission on illumination L*a*b* system in the color of maxillary central incisors

2020 ◽  
Vol 73 (9-10) ◽  
pp. 309-314
Author(s):  
Aleksandra Maletin ◽  
Milica Jeremic-Knezevic ◽  
Daniela Djurovic-Koprivica ◽  
Tanja Veljovic ◽  
Bojana Ramic ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Spectrophotometric Analysis ◽  
International Commission ◽  
Maxillary Incisor ◽  
Blue Color ◽  
Central Incisor ◽  
Color Tone ◽  
Tooth Color ◽  
Maxillary Central Incisor ◽  
Significant Difference

Introduction. Tooth color can be represented in a three-dimensional color system by applying L* (lightness), a* (red-green color tone) and b* (yellow-blue color tone) coordinates. Clinically significant color difference, Delta-E, can be expressed in units that are correlated with visual perception using the International Commission on Illumination L*a*b* system. The aim of the study was spectrophotometric analysis of the natural maxillary central incisor color, and to establish any gender-related differences in lightness, red-green tone, and yellow-blue tone coordinates. Material and Methods. The study included 80 students (40 male and 40 female, with an average age of 22 years). The color of the maxillary right central incisor was determined using an intraoral spectrophotometer and VITAPAN Classical and VITA 3D-Master color shade guides. Lightness, red-green tone, and yellow-blue tone values were recorded for each result. The obtained data were processed by using ?2, Student?s t-test and Mann-Whitney test. Results. Results showed no statistically significant gender-related difference in color according to the VITApan Classical and VITA 3D-Master color key. No difference was found in the lightness of the central maxillary incisor between genders, or in terms of red-green tone (p = 0.860573). A statistically significant difference was found when observing the sex-related yellow-blue tone of the color of the central maxillary incisor. Conclusion. The analysis of colorimetric parameters of the International Commission on Illumination L*a*b* system provides useful information about the tooth color in the examined population, while potentially revealing differences in lightness, red-green tone and yellow-blue tone between genders.

SEXUAL DIMORPHISM OF MINANGKABAUNES’ MAXILLARY CENTRAL INCISOR’S WIDTH

2017 ◽  
Vol 20 (1) ◽  
pp. 8-12
Author(s):  
Nila Kasuma ◽  
Susi Susi ◽  
Haria Fitri ◽  
Fildzah Nurul Fajrin
Keyword(s):  
Sexual Dimorphism ◽  
Sampling Technique ◽  
Simple Random Sampling ◽  
Maxillary Incisor ◽  
Central Incisor ◽  
Cross Sectional ◽  
Average Width ◽  
Maxillary Central Incisor ◽  
Biological Damage ◽  
Significant Difference

Teeth are known as organs made up of the hardest mineral tissue that is resistant to decay and physical, thermal, mechanical, chemical or biological damage. Tooth crown dimensions are reasonably accurate predictors of genders especially to young individuals whose secondary skeletal characteristics are yet developed. This research aims to analyse the influence of genders to the width of maxillary central incisor Minangkabaunese. The study was conducted using cross-sectional method in Luhak Agam, Luhak Tanah Datar and Luhak Lima Puluh Kota, West Sumatra using simple random sampling technique to a total of 120 samples. Teeth width was measured in mesiodistal dimension with 0.01 mm calibrated sliding digital caliper. The measurement was done on a tooth mould at ⅓ incisal as the position of mesial and biggest distar. T-test independent statistic test was done to determine the relationship between the 2 variables. Sexual dimorphism was determined with Garn formula. The research shows significant difference (p=0.001) between the width of left and right central incisor in males and females. The average width of the male and female right maxillary incisor is 8.545 mm and 8.370 mm, while the left central incisor width is 8.877 mm in male and 8.283 mm in females. Sexual dimorphism on the right central incisor is 2.09% and 3.43% on the left side. The conclusion of the study is that maxillary central incisor width can distinguish different genders in the identification process.

scholarly journals Stress Analysis of a Maxillary Central Incisor Restored with Different Posts

2007 ◽  
Vol 01 (02) ◽  
pp. 067-071 ◽  
Author(s):  
Necdet Adanir ◽  
Sema Belli
Keyword(s):  
Stress Distribution ◽  
Glass Fiber ◽  
Gold Alloy ◽  
Three Dimensional ◽  
Element Model ◽  
Von Mises Stress ◽  
Maxillary Incisor ◽  
Central Incisor ◽  
Cross Sectional ◽  
Maxillary Central Incisor

ABSTRACTObjectives: To evaluate the effects of different post materials on the stress distribution in an endodontically treated maxillary incisor.Materials and Methods: A pseudo 3-dimensional finite element model was created in a labiolingual cross-sectional view of a maxillary central incisor and modified according to five posts with different physical properties consisting stainless steel, titanium, gold alloy, glass fiber (Snowpost), and carbon fiber (Composipost). A 200 N force was then applied from two different directions; a) vertical load on the incisal edge, b) 45 degree diagonal load above the cingulum location. Stress distribution and values were then calculated by considering the pseudo three dimensional von Mises stress criteria.Results: Under two loading conditions, post made of steel showed greatest stress concentration at the post/dentin interface followed by titanium, gold alloy, Snowpost and Composipost. However, Composipost, which elastic modulus was closer to the dentin, produced highest stress values at 1/3 cervical area.Conclusions: Within the limitation of this simulated mechanical analysis, we can conclude that the physical characteristics of posts were important on stress distributions in post and core applications. Glass fiber post revealed more balanced stress distribution under functional forces. (Eur J Dent 2007;2:67-71)

The influence of varying maxillary central incisor vertical dimension on perceived smile aesthetics

2019 ◽  
Vol 46 (2) ◽  
pp. 137-142
Author(s):  
Elis Janaina Lira dos Santos ◽  
Alana Moura Xavier Dantas ◽  
Raíssa Marçal Vilela ◽  
Karina Jerônimo Rodrigues Santiago de Lima ◽  
Rejane Targino Soares Beltrão
Keyword(s):  
Age Groups ◽  
Educational Background ◽  
Cross Sectional Study ◽  
Central Incisor ◽  
Chi Square ◽  
Cross Sectional ◽  
Exact Test ◽  
Maxillary Central Incisor ◽  
Significant Difference ◽  
Chi Square Test

Objective: To evaluate patient perception of the smile focused on analysis of the upper incisors. Design: Cross-sectional study. Setting: Department of Clinical and Social Dentistry at Federal University of Paraíba, João Pessoa, Brazil. Participants: The sample consisted of 135 individuals (73 women and 62 men). Methods: Images with different characteristics associated with the incisal edges were shown at random and analysed using a Likert scale. Data were analysed using the Chi-square test or Fisher’s exact test with a statistically significant difference ( P < 0.05). Results: Smile I (difference of 1.5 mm in relation to the central incisor and lateral) was considered the most aesthetic, while Smile III (no difference in height between the central and lateral incisors) was the least aesthetic. A significant difference was found between perception of smile II (difference of 1 mm in relation to the central incisor and lateral) and age groups ( P < 0.005), with 31% (n = 13) of individuals aged 45–64 years considering smile II as not pleasant, 4.4% (n = 2) aged 15–24 years and 8.3% (n=4) aged 25–44 years and 4.4% (n = 2) aged 15–24 years considering the same. A significant difference was also found in relation to educational background of the assessor and smile perception, with smile III ( P = 0.0441) and smile IV ( P = 0.0053) considered the most aesthetic ( P = 0.0116). Conclusion: The smile considered most attractive among the sample was that with 1.5 mm steepness between the central and lateral incisors, while a flat smile arc was considered least attractive.

Comparison of Maxillary Central Inclination, Crown Angulation and Tooth Size Variation in Aesthetic and Non-aesthetic Smiles, A Cross Sectional Study

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Tarulatha Revanappa Shyagali ◽  
Rachita Singh ◽  
Anil Tiwari ◽  
Abhishek Gupta
Keyword(s):  
Size Variation ◽  
Cross Sectional Study ◽  
Tooth Size ◽  
Central Incisor ◽  
Cross Sectional ◽  
Maxillary Central Incisor ◽  
Normal Occlusion ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
The Aesthetic

Background: An attractive smile is often attributed to incisor alignment and proclined or retroclined incisors could contribute to a less aesthetic smile. Objectives: This study was aimed to evaluate the maxillary central incisor crown inclination, crown angulation and tooth size variation in aesthetic and unattractive smiles. Methods: This study was conducted among 100 females (equally divided into aesthetic and unaesthetic smile groups), aged between15 - 25 years, with Angle’s Class I normal occlusion and balanced profiles. Variations in maxillary central incisor crown inclination and angulation were measured on lateral cephalograms, photographs and the study models of the subjects. Variations in tooth morphology were also evaluated by measuring crown height and width in both groups. Mann-Whitney U test was performed to evaluate the difference between the aesthetic and unaesthetic smiles. P < 0.05 was considered as significant. Results: This study showed that incisor angulation was significantly higher in the unaesthetic group compared to the aesthetic group (P < 0.001). However, there was no statistically significant difference for the incisor inclination relative to the Palatal Plane between the aesthetic and unaesthetic smile groups (P = 0.086). In addition, there were significant differences between the aesthetic and the non-aesthetic groups regarding the central incisor height (P < 0.05). Conclusions: The findings of this study indicate that the possible variations in aesthetics are related to the ethnic elements that are associated with differences in crown angulations, as well as tooth size.

Endodontic Management of Canal Calcification in Maxillary Central Incisor Using 3D Prototyping Technique: A Case Report

2020 ◽  
Vol 11 (1) ◽  
pp. 93-96
Author(s):  
Suryasowjanya Doranala ◽  
Harikumar Vemisetty ◽  
Rajani Punna ◽  
Aditya Mohan Alwala
Keyword(s):  
Case Report ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Conventional Technique ◽  
Cone Beam ◽  
Central Incisor ◽  
Cavity Preparation ◽  
Present Case Report ◽  
Maxillary Central Incisor ◽  
Tooth Structure

Teeth with calcific metamorphosis pose a challenge to the endodontist in achieving proper access, identification, and debridement of the root canal. With the conventional technique, radiographs and bur orientation have dictated the access cavity preparation, which leads to the removal of more sound tooth structure and iatrogenic errors. To overcome these issues, the recent diagnostic imaging techniques such as cone beam computed tomography followed by three-dimensional fabrication of template have been proposed, which aid the clinician to accurately locate and negotiate the obliterated canal. The present case report describes the importance of conservative access cavity preparation with the use of the guided endodontic technique for the treatment of calcified canals in the maxillary central incisor.

Effects of labial and lingual retraction and intrusion force on maxillary central incisor with varying collum angles: A three-dimensional finite elemental analysis

2017 ◽  
Vol 51 (1) ◽  
pp. 28-37
Author(s):  
Sandesh S Pai ◽  
Suchareeta Panda ◽  
Vinaya Pai ◽  
M Anandu ◽  
E Vishwanath ◽  
...  
Keyword(s):  
Elemental Analysis ◽  
Three Dimensional ◽  
Central Incisor ◽  
Maxillary Central Incisor

scholarly journals Assessment of Labial Alveolar Bone Thickness in Maxillary Central Incisor using Cone Beam Computed Tomography

2021 ◽  
Vol 5 (1) ◽  
pp. 2-6
Author(s):  
Shaili Pradhan ◽  
Rejina Shrestha ◽  
Ranjita Shrestha Gorkhali ◽  
Pramod Kumar Koirala
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Alveolar Bone ◽  
Cone Beam ◽  
Central Incisor ◽  
Bone Thickness ◽  
Cross Sectional ◽  
Dental Surgery ◽  
Maxillary Central Incisor ◽  
Significant Difference

Introduction: The maxillary anterior region is becoming a major concern due to its aesthetic relevance. The buccal bone thickness is important for implant placement, orthodontic treatment and restorative treatment. Objective: To assess the thickness of alveolar bone in the maxillary central incisor using cone beam computed tomography (CBCT). Methods: A cross-sectional observational study was conducted at Department of Dental Surgery, Bir Hospital where CBCT of 53 samples from July 2019 till December 2019, the archived CBCT images was assessed retrospectively. The thickness of the labial bone in a direction perpendicular to the outer surface of the tooth root was measured at a distance of 2 mm from the cementoenamel junction (CEJ). The measurement was taken thrice and the mean measurement was considered. Results: The labial alveolar bone thickness in maxillary central incisor was found to be 0.55±0.27 mm at a distance of 2 mm from the CEJ. Only 2 (3.8%) of the samples had an alveolar thickness of >1 mm. No statistically significant difference was found with respect to gender and age. Conclusion: The average thickness of the labial alveolar bone in maxillary central incisor using cone beam computed tomography was found to be thin. 

scholarly journals Management of an Impacted Dilacerated Permanent Maxillary Central Incisor

2017 ◽  
Vol 2 (1) ◽  
pp. 44-46
Author(s):  
Puneet Goenka ◽  
Swati Agarwal ◽  
Vijay Lakshmi ◽  
Yogita Chaturvedi ◽  
Mitakshara Nirwan
Keyword(s):  
Dentigerous Cyst ◽  
Permanent Dentition ◽  
Permanent Teeth ◽  
Deciduous Teeth ◽  
Maxillary Incisor ◽  
Histopathologic Examination ◽  
Central Incisor ◽  
Common Cause ◽  
Maxillary Central Incisor ◽  
History Of

ABSTRACT The impacted maxillary incisor is rare and detrimental for problems related to esthetics and occlusion in permanent dentition stage. The diagnosis of an impacted incisor with dilaceration refers to a dental deformity characterized by an angulation between the crown and the root, causing noneruption of the incisor. The most common cause of dilaceration in a tooth is trauma to its primary predecessor like avulsions, intrusions, or gross displacement of primary incisors. This study presents a case with overretained mobile deciduous teeth that were diagnosed radiographically with an impacted dilacerated maxillary central incisor surrounded by a large radiolucency. History of trauma to the same region was given at the age of 1 year. On examination, multiple missing permanent teeth were noted. The management of the case was carried out by surgical enucleation and histopathologic examination confirmed diagnosis of an infected dentigerous cyst. How to cite this article Agarwal S, Goenka P, Lakshmi V, Chaturvedi Y, Nirwan M. Management of an Impacted Dilacerated Permanent Maxillary Central Incisor. J Mahatma Gandhi Univ Med Sci Tech 2017;2(1):44-46.

scholarly journals The influence of bracket torque on external apical root resorption in bimaxillary protrusion patients: a retrospective study

2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Xiaojuan Zhang ◽  
Hong Zhou ◽  
Xiangling Liao ◽  
Yi Liu
Keyword(s):  
Root Resorption ◽  
Three Dimensional ◽  
Post Treatment ◽  
Maxillary Central Incisor ◽  
Paired Samples ◽  
Anterior Teeth ◽  
Significant Difference ◽  
High Torque ◽  
Pre Treatment ◽  
Bimaxillary Protrusion

Abstract Background To evaluate the difference in root resorption between standard torque self-ligating brackets and high torque self-ligating brackets in bimaxillary protrusion patients after orthodontic treatment. Methods Pre-treatment and post-treatment Cone beam computed tomography (CBCT) of 32 patients (16 treated with the high torque DamonQ 0.022″ bracket and 16 with the 0.022″ standard torque self-ligating bracket) were selected. The first premolars were extracted from all patients before treatment. After mini-screw implants were inserted into the buccal region between the second premolar and first molar, 150 g of force was applied to retract the upper and lower anterior teeth to close the extraction space on each side. CBCT images of all patients were taken before and after treatment. Three-dimensional reconstruction of the maxillary central incisor, lateral incisor and canine was conducted with Mimics 20.0 software. The volumes of the roots were calculated using Gomagics Studio 12.0 software. The differences between the pre-treatment and post-treatment root volumes were statistically evaluated with a paired-samples t-test. Results There was no statistically significant difference in root resorption degree between the two kinds of torque brackets. The patient’s degree of root resorption in the high torque self-ligating group was greater than that in the standard torque group. Conclusions There was no significant difference in root external apical resorption between the high torque self-ligating brackets and the standard torque self-ligating brackets in bimaxillary protrusion patients.

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