scholarly journals Effects of Gender and Age in Mandibular Leeway Space for Taiwanese Children

Children ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 999
Author(s):  
Kuo-Ting Sun ◽  
Yun-Zhen Wu ◽  
Jui-Ting Hsu ◽  
Min-Chia Tsai ◽  
Heng-Li Huang
Keyword(s):  
Retrospective Study ◽  
Gender Difference ◽  
Pediatric Dentistry ◽  
Permanent Tooth ◽  
Mixed Dentition ◽  
Permanent Teeth ◽  
Tooth Size ◽  
Crown Width ◽  
Gender And Age ◽  
Lower Arch

Purpose: Leeway space is clinically crucial in pediatric dentistry because it is utilized to resolve tooth crowding and allow the first molars to drift mesially to establish a Class I molar relationship in the later stages of mixed dentition. This study investigated leeway space in the mixed dentition of Taiwanese children of different sexes and ages. Materials and Methods: The digital panoramic dental films of 182 lower arches of 119 boys and 63 girls aged 5–10 years were analyzed in this retrospective study. The mesiodistal crown widths of the primary canines and first and second molars and the permanent canines and first and second premolars were measured using medical imaging software. Differences in leeway space were statistically analyzed. Results: The average leeway space was 1.29 ± 1.48 mm on each side of the lower arch. The leeway space of children aged 5–6 years was significantly greater than that of children aged 7–8 years. No gender difference in crown width was discovered, except with regard to the primary first molar. Although no gender difference in leeway space was observed, permanent teeth affected leeway space more for girls than for boys. Conclusion: In Taiwanese children, although leeway space does not differ by sex, age affects leeway space. However, permanent tooth size has an influence on the leeway space of girls.

scholarly journals DETERMINATION OF THE STRUCTURE OF ACUTE INJURY OF TEMPORARY AND PERMANENT FRONTAL TEETH IN CHILDREN, ANALYSIS OF DIAGNOSTIC AND TREATMENT MEASURES AND THEIR EFFECTS

2020 ◽  
Vol 73 (4) ◽  
pp. 737-742
Author(s):  
Valentina P. Trufanova ◽  
Olha V. Sheshukova ◽  
Natalia A. Lyakhova ◽  
Tetiana V. Polishchuk ◽  
Sofia S. Bauman ◽  
...  
Keyword(s):  
Self Regulation ◽  
Pediatric Dentistry ◽  
Permanent Tooth ◽  
Acute Injury ◽  
Permanent Teeth ◽  
Traumatic Injuries ◽  
Acute Injuries ◽  
Jaw Apparatus ◽  
Treatment Measures

The aim: To determine the structure of acute injuries of temporary and permanent frontal teeth in children, to analyze the applied diagnostic and treatment measures for acute tooth trauma and to investigate their effectiveness. Materials and methods: The subject of the study were 31 children aged 2-12 years with acute temporary and permanent tooth trauma. Methods: clinical (radiological, thermodiagnosis), medical and statistical. Results: The number of injured permanent teeth was greater than the number of injured temporary teeth. The pattern of temporary and permanent tooth injuries differed, so in temporary teeth dislocations were observed, and in permanent teeth fractures prevailed over dislocations. In our opinion, this is due to the peculiarities of the anatomy of the temporary teeth. Usually, the therapeutic tactics of acute temporary teeth injuries is to remove them, despite their important role in the growth and development of jaws, physiological formation and eruption of permanent teeth. The therapeutic tactics of dynamic observation in the case of intrusive dislocation of the temporary tooth were selected in the clinic of the Department of Pediatric Dentistry. In some cases, with a slight change in the position of the temporary tooth, self-regulation of its position was observed, in other cases the tooth remained dystopic, but its viability remained in 50% of cases. Therapeutic tactics of acute injuries of permanent teeth were selected according to the type of trauma. In the case of permanent tooth dislocation, with a slight change in its position, tooth immobilization was carried out by splinting with fiberglass tape and photopolymer composite material. Conclusions: Our observations have shown that the complex of modern specialized medical care for the affected children with acute traumatic injuries of the teeth should be guided by their preservation, which ensures the subsequent normal formation of the dental-jaw apparatus. To ensure these conditions, a long, reliable immobilization of the damaged tooth is required as soon as possible after injury.

scholarly journals Evaluation and Applicability of Moyers Mixed Dentition Arch Analysis in Himachal Population

2014 ◽  
Vol 02 (02) ◽  
pp. 096-104
Author(s):  
Avninder Kaur ◽  
Reetu Singh ◽  
Sudhir Mittal ◽  
Sunila Sharma ◽  
Aditi Bector ◽  
...  
Keyword(s):  
Ethnic Diversity ◽  
Mixed Dentition ◽  
Permanent Teeth ◽  
Tooth Size ◽  
Dental Pathology ◽  
American Children ◽  
Predicted Values ◽  
Almost All ◽  
Digital Caliper

Abstract Introduction: The determination of a tooth-size to arch length discrepancy in mixed dentition requires an accurate prediction of the mesiodistal width of the unerupted permanent teeth. The Moyers mixed dentition space analysis is the non-radiographic method for detecting tooth-size arch length discrepancies. Moyers analysis was developed for North American children. Anthropological studies reveal that tooth size varies among different races and ethnicities. Aim: The present study was aimed to determine the applicability of Moyers mixed dentition arch analysis in children of Baddi, Himachal Pradesh. Materials and methods: Dental study models of 120 children in age group of 13- 16 years, were analysed who presented with complete eruption of permanent mandibular incisors, maxillary and mandibular canines & premolars. All dentitions were required to be free of any signs of dental pathology or anomalies. Measurements of the mesiodistal dimensions of the mandibular and maxillary teeth were made using a digital caliper with a Vernier scale that was calibrated to the nearest 0.01mm. The values were then subjected to statistical analysis. Results: All tooth groups showed highly significant differences (p<0.001) between mesiodistal widths in male and female subjects. Significant differences (p<0.05) were found between actual widths and the Moyers tables at almost all percentile levels, including the recommended 75%. Conclusion: The differences noted between predicted values from the Moyers tables and that of the present investigation might be the result of racial and ethnic diversity.

scholarly journals A retrospective study of Class II mixed-dentition treatment

2016 ◽  
Vol 87 (1) ◽  
pp. 56-67
Author(s):  
Heesoo Oh ◽  
Sheldon Baumrind ◽  
Edward L Korn ◽  
Steven Dugoni ◽  
Roger Boero ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Early Treatment ◽  
Treatment Time ◽  
Class Ii ◽  
Mixed Dentition ◽  
Permanent Teeth ◽  
Total Treatment Time ◽  
End Of Treatment ◽  
Total Treatment ◽  
Late Treatment

ABSTRACT Objective: To consider the effectiveness of early treatment using one mixed-dentition approach to the correction of moderate and severe Class II malocclusions. Materials and Methods: Three groups of Class II subjects were included in this retrospective study: an early treatment (EarlyTx) group that first presented at age 7 to 9.5 years (n = 54), a late treatment (LateTx) group whose first orthodontic visit occurred between ages 12 and 15 (n = 58), and an untreated Class II (UnTx) group to assess the pretreatment comparability of the two treated groups (n = 51). Thirteen conventional cephalometric measurements were reported for each group and Class II molar severity was measured on the study casts of the EarlyTx and LateTx groups. Results: Successful Class II correction was observed in approximately three quarters of both the EarlyTx group and the LateTx group at the end of treatment. EarlyTx patients had fewer permanent teeth extracted than did the LateTx patients (5.6% vs 37.9%, P &lt; .001) and spent less time in full-bonded appliance therapy in the permanent dentition than did LateTx patients (1.7 ± 0.8 vs 2.6 ± 0.7years, P &lt; .001). When supervision time is included, the EarlyTx group had longer total treatment time and averaged more visits than did the LateTx group (53.1 ± 18. 8 vs 33.7 ± 8.3, P &lt; .0001). Fifty-five percent of the LateTx extraction cases involved removal of the maxillary first premolars only and were finished in a Class II molar relationship. Conclusion: EarlyTx comprehensive mixed-dentition treatment was an effective modality for early correction of Class II malocclusions.

scholarly journals Analysis of Composite Resin Treatment Pattern Changes After the Insurance Coverage

2021 ◽  
Vol 48 (2) ◽  
pp. 151-159
Author(s):  
Sangmi Jo ◽  
Koeun Lee ◽  
Okhyung Nam ◽  
Hyo-seol Lee ◽  
Sungchul Choi ◽  
...  
Keyword(s):  
Composite Resin ◽  
Insurance Coverage ◽  
Pediatric Dentistry ◽  
Permanent Tooth ◽  
Permanent Teeth ◽  
Permanent Molar ◽  
Caries Treatment ◽  
Significant Difference ◽  
Before And After ◽  
Composite Resin Restoration

Since January 2019, insurance coverage for caries treatment of permanent teeth using composite resin in children aged 12 and under has started in South Korea. The purpose of this study was to compare the pattern of permanent molar composite resin restoration aged 12 and under before and after the insurance coverage from January 2009 to March 2020 in the Department of Pediatric Dentistry at Kyung Hee University Dental Hospital at Gangdong.<br/>Since the insurance coverage was started in 2019, the frequency of permanent molar composite resin restoration aged 12 and under has increased more than twice. There was a significant change in frequency of resin restoration by shape of cavity comparing before and after the insurance coverage, whereas there was no significant difference in changes by patient age, gender and position of tooth.<br/>As accessibility to the permanent tooth composite resin restoration is increased by the insurance coverage, which shows a fair survival rate, it is expected that it could be able to secure oral health in the early permanent dentition aged 12 and under.

scholarly journals A fool’s mission? A test of three common assumptions in dental metric analyses

2018 ◽  
Vol 26 (3) ◽  
pp. 16-30 ◽  
Author(s):  
Brian E. Hemphill
Keyword(s):  
Permanent Tooth ◽  
Permanent Dentition ◽  
Permanent Teeth ◽  
Human Populations ◽  
Tooth Size ◽  
Sex Dimorphism ◽  
Unit Of Analysis ◽  
Environmental Perturbations ◽  
Tooth Type ◽  
Males And Females

Three aspects of metric variation in the permanent dentition of humans are often simply accepted as true. The first is that formation of the permanent dentition occurs within morphogenetic fields broadly associated with tooth type and jaw. The second is that dental development of among females is characterized by a higher degree of ontogenetic buffering relative to males. The third is that expression of sex dimorphism in permanent tooth size is expressed uniformly among well-nourished human populations. This study tests these assumptions through an examination of mesiodistal and buccolingual dimensions of all non-canine permanent teeth, except third molars, among 2,709 living individuals of 15 ethnic groups from South Asia. With sexes pooled, only one in four contrasts of variance among key versus distal teeth within dental fields are significantly heterogeneous, while one in four contrasts yield higher levels of variance among key teeth relative to their distal counterparts within a dental field. Such results weaken considerably orthodox applications of Butler’s dental field theory. When samples are the unit of analysis, male samples are marked by fewer dental fields with significantly heterogeneous levels of variance between key and distal members, while males and females are affected equally by significantly heterogeneous variation between key and distal members when dental fields are the unit of analysis. Such results suggest males and females are equally buffered against environmental perturbations that affect odontometric variation. One-way ANOVA indicates that a tooth’s position within a dental field ac-counts for 15.5% to 23.1% of the observed varia-tion in tooth size, while two-way ANOVA reveals that when sex is added as a second factor, the percentage of variance in tooth size explained increases from 16.7% to 30.8%, an improvement of 27.2%. Such results indicate sex dimorphism in tooth size varies in both patterning and in magnitude among these samples, thereby explaining why discriminant functions developed for one population often perform more poorly when applied to other populations.

Human permanent tooth sizes are associated with genes encoding oestrogen receptors

2020 ◽  
pp. 146531252095871
Author(s):  
Arthur S Cunha ◽  
Luiza Vertuan dos Santos ◽  
Samantha Schaffer Pugsley Baratto ◽  
Zerrin Abbasoglu ◽  
Jennifer Tsi Gerber ◽  
...  
Keyword(s):  
Genetic Polymorphisms ◽  
Oestrogen Receptor ◽  
Cross Sectional Study ◽  
Permanent Tooth ◽  
Permanent Teeth ◽  
Tooth Size ◽  
Oestrogen Receptors ◽  
Cross Sectional ◽  
Significant Difference ◽  
School Of Dentistry

Objective: To evaluate if genetic polymorphisms in the oestrogen receptor 1 ( ESR1) and oestrogen receptor 2 ( ESR2) genes encoded for oestrogen receptors alpha (ERα) and beta (ERβ) are involved in permanent tooth size. Design: Cross-sectional study. Setting: Orthodontic Clinic at School of Dentistry of Ribeirão Preto, University of São Paulo. Participants: A total of 108 orthodontic patients. Materials and Methods: Pre-treatment orthodontic records were evaluated. Dental casts were used to determine the maximum crown measurements of fully erupted permanent teeth in the mesiodistal dimensions. Second and third molars were not included in the analysis. Genomic DNA samples were used for the genotyping of four genetic polymorphisms: ESR1 (rs9340799 and rs2234693) and ESR2 (rs1256049 and rs4986938). The associations between tooth size and sex were evaluated using t test. The associations between tooth size and genotype were analysed with linear regression and adjusted by sex at an alpha of P⩽0.05. Results: Female patients presented smaller tooth size than male patients. A statistically significant difference was observed in almost all teeth ( P<0.05). The genetic polymorphisms in rs9340799, rs2234693, rs1256049 and rs4986938 were associated with some tooth sizes in both the maxilla and mandible ( P<0.05). Conclusion: This study provides evidence that genetic polymorphisms in ESR1 and ESR2 could be associated with tooth size in permanent teeth.

scholarly journals Equation for Tooth Size Prediction from Mixed Dentition Analysis for Taiwanese Population: A Pilot Study

2021 ◽  
Vol 18 (12) ◽  
pp. 6356
Author(s):  
See Yen Chong ◽  
Lwin Moe Aung ◽  
Yu-Hwa Pan ◽  
Wei-Jen Chang ◽  
Chi-Yang Tsai
Keyword(s):  
Permanent Tooth ◽  
Mixed Dentition ◽  
Tooth Size ◽  
Regression Equations ◽  
Taiwanese Population ◽  
Taiwanese People ◽  
Student’S T ◽  
Simple Linear Equation ◽  
Mixed Dentition Analysis ◽  
Dental Casts

Background: In mixed dentition analysis, estimation of the mesiodistal width of unerupted permanent canines and premolars is essential for successful diagnosis and treatment planning. The present study aimed to develop a simple linear equation to predict permanent tooth sizes from mixed dentition analysis for Taiwanese people. Methods: The sample comprised 200 dental casts, derived from Taiwanese patients (100 males and 100 females; age, 12–35 years). Mesial distal tooth widths were measured in dental casts with a digital caliper. A student’s t-test was conducted to detect tooth size correlations with gender-specific differences, as well as intra-arch counterparts. Standard linear regression was conducted to develop a simple equation representing predictions of canine-premolar relationships. Results: All teeth were not significantly different between the left and right sides, regardless of gender and upper or lower arches. In terms of types of teeth, males had larger tooth dimensions in both arches than females. New regression equations for estimating the dimensions of the unerupted canines and premolars in the Taiwanese population were developed. Conclusions: Using a sample of Taiwanese people, new models derived for females and males separately were developed, which should provide highly accurate predictions for unerupted canines and premolars in the Taiwanese population.

scholarly journals Kegunaan radiografi panoramik pada masa mixed dentition

2021 ◽  
Vol 5 (1) ◽  
pp. 39
Author(s):  
Azda Nurma Himammi ◽  
Bambang Tri Hartomo
Keyword(s):  
Panoramic Radiography ◽  
Permanent Tooth ◽  
Transitional Period ◽  
Mixed Dentition ◽  
Permanent Teeth ◽  
Deciduous Teeth ◽  
Central Incisor ◽  
Transient Period ◽  
Transitional Phase ◽  
Mandibular First Molar

Objectives: The purpose of this review is to determine the usefulness of panoramic radiography during mixed dentition and also to capture panoramic radiographs during mixed dentition. Review: Mixed dentition is a period of mixed dentition and a period of transition from sequential deciduous teeth followed by the eruption of the replacement tooth, namely the permanent tooth. The mixed dental phase occurs in children aged 6-12 years, beginning with the eruption of the first permanent tooth, usually a central incisor or mandibular first molar. Changes in occlusion occur significantly during this time due to the loss of the deciduous teeth and the eruption of the replacement permanent teeth. Conclusion: The mixed dentition period can be classified into 3 phases, namely. (1) the first transitional period, occurs at 6-8 years of age. In this phase, the eruption of the permanent first molars and the replacement of the deciduous incisors with the permanent incisors occurred. (2) the inter-transitional period, after the first molars and permanent incisors erupt, there is a transient period of about 1-2 years before the second transition phase begins. In this phase, it is called inter-transitional because the maxillary and mandibular arches consist of deciduous and permanent teeth. In the inter-transitional phase it is relatively stable and no changes occur. (3) the second transitional period at age (10-13 years), the date of the mandibular canine at about 10 years of age usually begins the second transitional period.

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