scholarly journals Mesial Rotation of the Upper First Molar: Association with Anterior Dental Crowding in Mixed and Permanent Dentition

2020 ◽  
Vol 10 (15) ◽  
pp. 5301
Author(s):  
Vincenzo Quinzi ◽  
Simona Tecco ◽  
Alessandro Nota ◽  
Eleonora Caggiati ◽  
Stefano Mummolo ◽  
...  
Keyword(s):  
Class Ii ◽  
Permanent Dentition ◽  
Mixed Dentition ◽  
Class I ◽  
Class Ii Malocclusion ◽  
Chi Square ◽  
Anterior Crowding ◽  
Dental Crowding

The position of the upper first molar (UFM) is currently considered the “key of occlusion”. The purpose of this study was to evaluate the prevalence of the mesiorotated UFM, and its relationship with anterior dental crowding in mixed and permanent dentition. Intra-oral scans of upper dental arches of 180 subjects with mixed dentition and 169 subjects with permanent dentition were retrospectively analyzed to investigate the presence of UFM mesiopalatal rotation and presence of anterior crowding. The occlusal relationship and the presence of caries were also recorded. In subjects with permanent dentition, there was a statistically significant correlation between anterior crowding and UFM mesiopalatal rotation (Pearson’s chi-square = 9.03; p = 0.06). Among cases with permanent dentition, subjects with UFM mesiopalatal rotation showed an OR = 3.28 (95% CI = 0.99–10.93; p = 0.042) of moderate/severe anterior dental crowding, respect to subjects without UFM rotation. In subjects with mixed dentition, there was a statistically significant correlation between molar occlusal relationship and UFM mesiopalatal rotation (Pearson’s chi-square = 14.98; p = 0.002), and subjects with molar class II showed a OR = 10.2 (95% CI = 2.16–48.22; p = 0.0005) to present UFM mesiopalatal rotation, with respect to subjects with molar class I. UFM mesiopalatal rotation is associated to anterior dental crowding in permanent dentition, and to class II malocclusion in mixed dentition.

scholarly journals Relationship between skeletal malocclusion and dental anomalies in Nepalese population

2019 ◽  
Vol 9 (1) ◽  
pp. 15-18
Author(s):  
Bashu Dev Pant ◽  
Anjana Rajbhandari ◽  
Resina Pradhan ◽  
Manju Bajracharya
Keyword(s):  
Third Molar ◽  
Class Ii ◽  
Class I ◽  
Class Ii Malocclusion ◽  
Class Iii ◽  
Dental Anomalies ◽  
Chi Square ◽  
Skeletal Class ◽  
Skeletal Malocclusion ◽  
Third Molar Agenesis

Introduction: Teeth eruption is important for the development of alveolar process which increases vertical height of the face and third molar is the last tooth to erupt in the oral cavity after birth. The aim of this study was to determine relationship between skeletal malocclusion and dental anomalies in Nepalese population. Materials & Method: A sample of 170 patients with agenesis of at least one third molar was divided into four groups according to the third-molar agenesis pattern. Panoramic radiographs, lateral cephalograph and cast models were used to determine the skeletal malocclusion and associated dental anomalies. The Pearson chi-square test was used for stastical analysis. Result: Among 170 patients more than half of the patients were female with the average age being 18.15 ± 3.64 years. Majority of the patients had Class I skeletal malocclusion followed by Class II and III but on group wise comparison of patients with different skeletal patterns Class I skeletal malocclusion had highest prevalence of dental anomalies followed by Class III and Class II malocclusion. Conclusion: Prevalence of third-molar agenesis was more in skeletal class I malocclusion followed by class II and III but skeletal Class I malocclusions had more dental anomalies followed by class III and class II malocclusion.

scholarly journals Global distribution of malocclusion traits: A systematic review

2018 ◽  
Vol 23 (6) ◽  
pp. 40.e1-40.e10 ◽  
Author(s):  
Maged Sultan Alhammadi ◽  
Esam Halboub ◽  
Mona Salah Fayed ◽  
Amr Labib ◽  
Chrestina El-Saaidi
Keyword(s):  
Class Ii ◽  
Permanent Dentition ◽  
Open Bite ◽  
Mixed Dentition ◽  
Class I ◽  
Pool Data ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Posterior Crossbite ◽  
Electronic Search

Abstract Objective: Considering that the available studies on prevalence of malocclusions are local or national-based, this study aimed to pool data to determine the distribution of malocclusion traits worldwide in mixed and permanent dentitions. Methods: An electronic search was conducted using PubMed, Embase and Google Scholar search engines, to retrieve data on malocclusion prevalence for both mixed and permanent dentitions, up to December 2016. Results: Out of 2,977 retrieved studies, 53 were included. In permanent dentition, the global distributions of Class I, Class II, and Class III malocclusion were 74.7% [31 - 97%], 19.56% [2 - 63%] and 5.93% [1 - 20%], respectively. In mixed dentition, the distributions of these malocclusions were 73% [40 - 96%], 23% [2 - 58%] and 4% [0.7 - 13%]. Regarding vertical malocclusions, the observed deep overbite and open bite were 21.98% and 4.93%, respectively. Posterior crossbite affected 9.39% of the sample. Africans showed the highest prevalence of Class I and open bite in permanent dentition (89% and 8%, respectively), and in mixed dentition (93% and 10%, respectively), while Caucasians showed the highest prevalence of Class II in permanent dentition (23%) and mixed dentition (26%). Class III malocclusion in mixed dentition was highly prevalent among Mongoloids. Conclusion: Worldwide, in mixed and permanent dentitions, Angle Class I malocclusion is more prevalent than Class II, specifically among Africans; the least prevalent was Class III, although higher among Mongoloids in mixed dentition. In vertical dimension, open bite was highest among Mongoloids in mixed dentition. Posterior crossbite was more prevalent in permanent dentition in Europe.

scholarly journals Orthopedic cervical headgear in Class II treatment: case report

2003 ◽  
Vol 14 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Carla Enoki ◽  
Mírian Aiko Nakane Matsumoto ◽  
José Tarcísio Lima Ferreira
Keyword(s):  
Case Report ◽  
Growth Pattern ◽  
Class Ii ◽  
Mixed Dentition ◽  
Class I ◽  
Cephalometric Analysis ◽  
Class Ii Malocclusion ◽  
Class Ii Treatment ◽  
Division 1 ◽  
Downward Displacement

Early treatment for Class II malocclusion was undertaken with the objective of correcting skeletal disproportion by altering the growth pattern. A case of Class II, Division 1 malocclusion in the mixed dentition was corrected to Class I molar relationship using orthopedic cervical headgear, with nonextraction edgewise therapy. Cephalometric analysis indicated a reduction in the maxillomandibular discrepancy (ANB) correcting the Class II malocclusion to Class I malocclusion. The treatment showed that this was achieved by downward displacement and inhibition of the forward growth of the maxilla and growth of the mandible. There was no downward rotation of the mandible nor maxillary first molar extrusion. There was improvement in the jaw relationship.

scholarly journals Runx2 rs59983488 polymorphism in class II malocclusion in the Indonesian subpopulation

2021 ◽  
Vol 54 (4) ◽  
pp. 216
Author(s):  
Fadli Jazaldi ◽  
Benny M. Soegiharto ◽  
Astrid Dinda Hutabarat ◽  
Noertami Soedarsono ◽  
Elza Ibrahim Auerkari
Keyword(s):  
Regulatory Gene ◽  
Class Ii ◽  
Class I ◽  
Control Group ◽  
Class Ii Malocclusion ◽  
Chi Square ◽  
Equal Distribution ◽  
Frequency Distributions ◽  
Skeletal Malocclusion ◽  
Chi Square Test

Background: Class II malocclusion is one of the main orthodontic issues for patients in seeking treatment. The prevalence of class II malocclusion varies in different populations. Variation in skeletal profile is mainly controlled internally by a regulatory gene. Runt-related transcription factor-2 (Runx2) plays a role in osteoblast differentiation and is highly expressed during development. Purpose: This study aimed to evaluate the relation of regulatory gene variation in the Runx2 promoter with class II malocclusion. Methods: DNA samples were acquired from 95 orthodontic patients in Jakarta, Indonesia, who were divided into two groups: class I skeletal malocclusion (control group) and class II malocclusion. A single nucleotide polymorphism was investigated using the polymerase chain reaction and restriction fragment length polymorphism techniques. The distribution of alleles was assessed using the Hardy-Weinberg test. The relationship between polymorphism and skeletal variation was assessed with the Chi-Square test and logistic regression. Results: The frequency distributions of genotypes and alleles were tested for Hardy-Weinberg equilibrium and found to be slightly deviated. There was an equal distribution of G and T alleles throughout class II and class I skeletal malocclusions and the Chi-Square test showed that this relationship was not significant (p=0.5). Conclusion: Runx2 rs59983488 polymorphism was found in the Indonesian subpopulation; however, an association between Runx2 rs59983488 polymorphism and class II skeletal malocclusion was not found.

scholarly journals Differences in the factors associated with tongue pressure between children with class I and Class II malocclusions

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yuko Fujita ◽  
Yoma Ohno ◽  
Keitaro Ohno ◽  
Tomohiro Takeshima ◽  
Kenshi Maki
Keyword(s):  
Grip Strength ◽  
Class Ii ◽  
Hand Grip Strength ◽  
Mixed Dentition ◽  
Class I ◽  
Tongue Pressure ◽  
Class Ii Malocclusion ◽  
Masticatory Performance ◽  
Occlusal Force ◽  
Hand Grip

Abstract Background The relationship between tongue pressure and masticatory performance during the mixed dentition period in cases of Class II malocclusion has not been clarified. The aim of this study was to determine differences in tongue pressure-related factors, including maxillofacial morphology and masticatory performance, between Class I and Class II malocclusions during the mixed dentition period. Methods A total of 56 children with Class I malocclusion (12 boys, 16 girls) or Class II malocclusion (16 boys, 12 girls) with mixed dentition were included in the present study. Height, body weight, hand grip strength, maximum occlusal force, maximum tongue pressure, masticatory performance, and the number of decayed, missing, and filled teeth were measured in all participants. Their lateral cephalograms were also evaluated. The means of all measurements were compared between Class I and Class II malocclusions. Pearson’s correlation coefficients were used to determine associations between maximum tongue pressure and other variables for each type of malocclusion. Results The maximum tongue pressure, hand grip strength, and maximum occlusal force in the Class II malocclusion group were significantly lower than those in the Class I malocclusion group (all, p < 0.05). The maximum tongue pressure was significantly positively correlated with hand grip strength, maximum occlusal force, masticatory performance, and SNB (sella, nasion, B point) angle in the Class I group (all, p < 0.05), and with height, body weight, and labial inclination of the central incisors in the Class II group (all, p < 0.05). Conclusions The maxillofacial morphometric factors associated with tongue pressure were clearly different between cases of Class I and Class II malocclusion with mixed dentition. Masticatory performance and tongue pressure were significantly positively correlated in cases of Class I malocclusion, but not in cases of Class II malocclusion.

scholarly journals Prevalence of Dental Midline Shifting in a Sample of Orthodontic Patients in Erbil City

2020 ◽  
Vol 7 (1) ◽  
pp. 545-555
Author(s):  
Deman Hasan Hamid ◽  
Tara Saleem Hamad ◽  
Asma Qasim Rahman ◽  
Rebin Ali Mohammed ameen
Keyword(s):  
Class Ii ◽  
Permanent Dentition ◽  
Class I ◽  
Midline Shift ◽  
Chi Square ◽  
Data Analyses ◽  
Orthodontic Patients ◽  
Facial Midline ◽  
Level Of Significance ◽  
Gender Type

Aim of the study: the study aimed to determine the prevalence of dental midline shifting in a group of orthodontic patients. Methodology: The study was conducted on 506 orthodontic patients (183 boys and 323 girls), between13-40 years old, who came to orthodontic department, college of dentistry. The data collected from orthodontic records were analyzed according to the gender, type of dentition and Angle Classes of malocclusion. Dental Midline shifting was observed on patient with respect to patient’s facial midline. SPSS version 20.0 for windows was used for data analyses using Chi-square Pearson tests and Fischer exact tests. Level of significance was set at p<0.05. Results: Around half of the total orthodontic patients had dental midline shifting (49.41 %) which was greater in the maxilla (25.89%) than the mandible (23.52%) slightly. The prevalence of dental midline shifting was more in girls (30.2%), with permanent dentition (48.02%) and with Class I (26.28%) and Class II (18.18) malocclusion. Conclusions: The prevalence of maxillary-mandibular dental midlines was seen in around half of orthodontic patients only. Class I patients were found to have maximum dental midline shift.

scholarly journals A Comparative Study of Arch Widths of Bangladeshi Subject with Normal Occlusion and Class II Division 1 Malocclusion

2013 ◽  
Vol 2 (2) ◽  
pp. 18-23
Author(s):  
MM Islam ◽  
MZ Hossain
Keyword(s):  
Comparative Study ◽  
Class Ii ◽  
Class I ◽  
Dental Arch ◽  
Class Ii Malocclusion ◽  
Normal Occlusion ◽  
Division 1 ◽  
The Mean ◽  
Dental Crowding ◽  
Class Ii Division 1

Aim: To evaluate possible differences of the upper and lower dental arches width among youths with Class I,normal occlusion and Class II, division 1 malocclusion. Materials and Methods: The evaluation was conducted on 100 pairs of dental casts of Bangladeshi youths with permanent dentition, 50 with Class I, normal occlusion (22 males and 28 females) at the mean age of 19±3 years and 50 with Class II, division 1, malocclusion (18 males and 32 females ) at the mean age of 20±4 years. The group with Class II malocclusion was divided into two categories: Class II without dental crowding and Class II with dental crowding. A comparison was made between the intercanine inter first premolar and intermolar widths of both dental arches. Results: Subjects with Class II, division, 1 malocclusion when compared with Class I normal occlusion presented (a) in the upper dental arch , smaller intermolar, interpremolar and intercanine width. (b) in the lower dental arch , smaller intermolar width. DOI: http://dx.doi.org/10.3329/bjodfo.v2i2.16159 Ban J Orthod & Dentofac Orthop, April 2012; Vol-2, No.2, 18-23

scholarly journals The correlation between malocclusions and morphofunctional aspects: analysis of patients aged from 7 to 12 years old

2016 ◽  
Vol 19 (4) ◽  
pp. 90
Author(s):  
Regiane Almeida Da Silva ◽  
Renato Morales Jóias ◽  
Erika Josgrilberg ◽  
Sigmar De Mello Rode ◽  
Luiz Renato Paranhos ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Class Ii ◽  
Open Bite ◽  
Mixed Dentition ◽  
Class I ◽  
Class Iii ◽  
Anterior Open Bite ◽  
Chi Square ◽  
Significance Level ◽  
Important Correlation

<p><strong>Objective</strong>: To classify the malocclusions and their occlusal and morphofunctional aspects in order to establish possible correlations. <strong>Material and Methods</strong>: The present observational and analytical study was performed within 432 dental records of patients. The patients were aged between 7 and 12 years old (228 males and 204 females) from an Educational Institute in the state of São Paulo, Brazil. The data regarding the malocclusions and the related associations underwent parametric statistical tests for quantitative and qualitative analysis (ANOVA, Tukey test and Chi-square) considering the significance level at 5%. <strong>Results:</strong> Most of the patients had permanent dentition (58.6%), followed by mixed dentition. Angle’s Class II malocclusion was the most prevalent (67.2%), followed by Class I and III. Overbite and anterior open bite represented, respectively, 47% and 7.2% of the vertical discrepancies. The average overbite was 3.08mm, while the average overjet was 4.67mm. Approximately 43,1% of the sample presented moth breathing. Atypical swallowing reached 78.7% of the patients. Statistically significant correlations were observed associating Angle’s Class III malocclusion with anterior cross bite and bilateral posterior cross bite; as well as between Angle’s Class II with overbite, and Angle’s Class I with overbite and atypical swallowing. A correlation was observed between atypical swallowing; the use of pacifiers; and predominant mouth breathing (p&lt;0.001). <strong>Conclusion:</strong> An important correlation was found between the type of malocclusions and the morphofunctional aspects of occlusion in patients aged from 7 to 12 years old, indicating the need for immediate intervention once the diagnosis is established.</p><p> </p><p><strong>Keywords:</strong> Applications of epidemiology, Malocclusion, Child.</p>

scholarly journals Early management of class II division 2 malocclusion. Literature review

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
Carolina Rodríguez-Manjarrés ◽  
Margarita-Rosa Padilla-Tello
Keyword(s):  
Treatment Options ◽  
Relevant Information ◽  
Class Ii ◽  
Mixed Dentition ◽  
Mandibular Advancement ◽  
Maxillary Expansion ◽  
Early Management ◽  
Mandibular Retrognathism ◽  
Dental Crowding ◽  
Division 2

This paper presents the most relevant information about the class II division 2 malocclusion (II / 2) described in the literature and different treatment options based on orthopedics. Class II malocclusion is characterized by mandibular retrognathism and / or prognathic maxillary which could affect the molar relationship and considering the dental component is subdivided into Type 1, characterized by vestibular inclination of all upper incisors and Type 2 with upper central incisors retroclined and vestibularized lateral incisors. It presents multifactorial etiology. As reported by the literature, the incidence of malocclusion Class II / 2 ranges from 3-12%. It is characterized by different vertical, transverse, facial, skeletal and dental features that differentiate it from other malocclusions, and thus make decisions on time. Therefore, early treatment of this type of malocclusion, can reduce the possibility of surgery, minimizec the severity of the alteration in stomatological system functions and improve the overall appearance of the patient. The goals of treatment are directed transversely performing maxillary expansion to allow correction in alteration of the axial inclination of the upper incisors and solve dental crowding, leading to a malocclusion class II / 1, for further mandibular advancement. Keywords: Malocclusion, Class II Division 2, mixed dentition, functional orthopedics of the jaws.

scholarly journals Correction of gummy smile by superior repositioning of maxilla in Bangladeshi people

2016 ◽  
pp. 1-5
Author(s):  
Abdullah Al Masud ◽  
Muhammad Shohag Shikder ◽  
Mohammad Tofazzal Hossan ◽  
Mohammad Mahfuzul Gani ◽  
Mohammad Wahidul Islam
Keyword(s):  
Orthodontic Treatment ◽  
Class Ii ◽  
Class I ◽  
Class Ii Malocclusion ◽  
Le Fort I Osteotomy ◽  
Le Fort ◽  
Le Fort I ◽  
Gummy Smile

Vertical maxillary excess is associated with gummy smile, incompetent lip,  bimaxillary proclination, Angle’s class-I or class-II malocclusion with or without retogenia. After proper evaluation preoperative orthodontic treatment was performed in every cases and superior repositioning of the maxilla by Le Fort-I osteotomy is presented. Three patients with maxillary excess associated with retrogenia or microgenia were treated with this technique in combination with genioplasty. The maxillary segment was repositioned a maximum of 7.0 mm superiorly at point A. The mandible autorotated anterosuperiorly to achieve sound occlusion. Point B moved 1.0–3.0 mm anteriorly and 5.0–8.0 mm superiorly. The pogonion moved 4.0 mm anteriorly in a case done without genioplasty and the pogonion moved maximum 8.0mm in case done in combination with genioplasty. All patients obtained sound occlusion and a good profile after the operation. Almost no skeletal relapse was observed during 3 years of postoperative follow-up. Amount of gingiva showing during smile was ranges from 5.0mm –7.0mm which was 0-2.0mm after superior repositioning of the maxilla. Ban J Orthod & Dentofac Orthop, April 2016; Vol-6 (1-2), P.1-5

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