scholarly journals Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

2014 ◽  
Vol 85 (4) ◽  
pp. 577-584 ◽  
Author(s):  
Aleksandar Jakovljevic ◽  
Emira Lazic ◽  
Ivan Soldatovic ◽  
Nenad Nedeljkovic ◽  
Miroslav Andric
Keyword(s):  
Logistic Regression ◽  
Age Groups ◽  
Third Molar ◽  
Width Ratio ◽  
Class Iii ◽  
Second Molar ◽  
Age Related ◽  
Mandibular Third Molar ◽  
Lateral Cephalograms ◽  
Third Molar Eruption

ABSTRACT Objective:  To analyze radiographic predictors for lower third molar eruption among subjects with different anteroposterior skeletal relations and of different age groups. Materials and Methods:  In total, 300 lower third molars were recorded on diagnostic digital orthopantomograms (DPTs) and lateral cephalograms (LCs). The radiographs were grouped according to sagittal intermaxillary angle (ANB), subject age, and level of lower third molar eruption. The DPT was used to analyze retromolar space, mesiodistal crown width, space/width ratio, third and second molar angulation (α, γ), third molar inclination (β), and gonion angle. The LC was used to determine ANB, angles of maxillar and mandibular prognathism (SNA, SNB), mandibular plane angle (SN/MP), and mandibular lengths. A logistic regression model was created using the statistically significant predictors. Results:  The logistic regression analysis revealed a statistically significant impact of β angle and distance between gonion and gnathion (Go-Gn) on the level of lower third molar eruption (P < .001 and P < .015, respectively). The retromolar space was significantly increased in the adult subgroup for all skeletal classes. The lower third molar impaction rate was significantly higher in the adult subgroup with the Class II (62.3%) compared with Class III subjects (31.7%; P < .013). Conclusion:  The most favorable values of linear and angular predictors of mandibular third molar eruption were measured in Class III subjects. For valid estimation of mandibular third molar eruption, certain linear and angular measures (β angle, Go-Gn), as well as the size of the retromolar space, need to be considered.

scholarly journals The Frequency of Mandibular Third Molar Impaction in Different Types of Vertical Skeletal Faces

2021 ◽  
Vol 30 (02) ◽  
pp. 118-123
Author(s):  
Sana Viqar ◽  
◽  
Sadia Rizwan ◽  
Syed Shah Faisal ◽  
Syed Sheeraz Hussain
Keyword(s):  
Third Molar ◽  
Third Molars ◽  
Skeletal Malocclusion ◽  
Mandibular Third Molar ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
Pre Treatment ◽  
Mandibular Third Molars ◽  
Facial Types ◽  
Third Molar Eruption

OBJECTIVE: To determine the frequency of mandibular third molar impaction in different vertical skeletal facial types. METHODOLOGY: Data was collected using pre-treatment records including orthodontic files, pre-treatment lateral cephalograms and OPGs of 90 orthodontic patients. Patients from both genders were included. The age group of selected patients was 18-30 years. Vertical skeletal malocclusion was measured using facial angle and mandibular plane angle on cephalogram to group the subjects into Mesiofacial, Brachyfacial and Dolichofacial patients. Third molar eruption status was assessed using OPG. RESULTS: Results showed that erupted third molars were mostly found in brachyfacial patients. Among 32 erupted mandibular third molars, 16 belong to brachyfacial, 11 belonged to mesiofacial and 5 belonged to dolichofacial group. Complete impaction of mandibular third molar was most common among dolichofacial patients. Among 29 completely impacted mandibular third molars, 14 belong to dolichofacial, 9 belonged to mesiofacial and 6 belonged to brachyfacial group. No significant difference was found for partially impacted third molars among the three groups of facial types. There was higher prevalence of mandibular third molar impaction in females as compared to males. CONCLUSION: Frequency of third molar impaction was found to be highest in dolichofacial patients and lowest in brachyfacial patients due to forward direction of mandibular growth contributing to greater resorption of the anterior border of ramus and the additional space required for third molar eruption.

Factors associated with mandibular third molar eruption and impaction

2006 ◽  
Vol 30 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Hung-Huey Tsai
Keyword(s):  
Third Molar ◽  
Mandibular Ramus ◽  
Second Molar ◽  
Gonial Angle ◽  
Mandibular Plane ◽  
Mandibular Third Molar ◽  
Distal Surface ◽  
Discriminatory Analysis ◽  
Mandibular Second Molar ◽  
Third Molar Eruption

A retrospective study, using panoramic radiographs, was conducted on 152 Taiwanese (72 males and 80 females) to investigate mandibular third molar eruption and impaction. The following measurements were made: inclinations and mesiodistal crown widths of the mandibular molars, vertical and horizontal spaces between the distal surface of the second molar and the anterior surface of the ramus, lengths and widths of the mandibular ramus and body, the ramus inclination, the mandibular plane angle, and the mandibular gonial angle. Differences between non-impaction and impaction groups were studied, and the variables were analyzed with multivariate discriminatory analysis. Significant differences between the two groups were found; variables describing spaces between the anterior of the ramus and the distal of the mandibular second molar and tooth size appeared to be the primary contributors to the differences observed.

scholarly journals Size of the lower third molar space in relation to age in Serbian population

2013 ◽  
Vol 70 (10) ◽  
pp. 923-928 ◽  
Author(s):  
Ksenija Zelic ◽  
Nenad Nedeljkovic
Keyword(s):  
Age Groups ◽  
Third Molar ◽  
Adult Patients ◽  
Width Ratio ◽  
Third Molars ◽  
Gonial Angle ◽  
Angle Size ◽  
The Third ◽  
Crown Width ◽  
Third Molar Eruption

Background/Aim. It is considered that the shortage of space is the major cause of the third molar impaction. The aim of this study was to establish the frequency of insufficient lower third molar eruption space in Serbian population, to question the differences in this frequency in the subjects of different age, to determine the influence of the lower third molar space (retromolar space) size on third molar eruption, and to investigate a possible correlation between the size of gonial angle and the space/third molar width ratio. Methods. Digital orthopantomograms were taken from 93 patients divided into two groups: early adult (16-18 years of age) and adult (18-26) patients. Retromolar space, mesiodistal third molar crown width, gonial angle and eruption levels were measured. Results. The space/third molar width in early adult subjects was smaller (p < 0.0001) and insufficient space was significantly more frequent (p = 0.0003) than in adult patients. Considerably more third molars erupted in case of enough space in both age groups (p < 0.0001). There was no difference between the means of gonial angle size in relations to the available space. Conclusions. The retromolar space/third molar width ratio is more favorable in adult subjects. Gonial angle is not in correlation with the retromolar space/third molar width ratio.

Age Related Prevalence of Pre-Eruptive Intracoronal Radiolucent Defects in the Permanent Dentition

2016 ◽  
Vol 40 (2) ◽  
pp. 103-106 ◽  
Author(s):  
Marina Umansky ◽  
Nili Tickotsky ◽  
Silvina Friedlander-Barenboim ◽  
Sarit Faibis ◽  
Moti Moskovitz
Keyword(s):  
Retrospective Study ◽  
Age Groups ◽  
Third Molar ◽  
Young Group ◽  
Young Age ◽  
Permanent Teeth ◽  
Significance Level ◽  
Adult Age ◽  
Age Related ◽  
Unerupted Teeth

Objective: The present study aimed to determine if the prevalence of pre-eruptive intracoronal radiolucent defects is higher for young age groups, in which there are more unerupted teeth. Study design: A retrospective study of panoramic and bitewing radiographs was conducted. An inclusion criterion was the presence of un-erupted permanent teeth with a formed and clearly visible crown. Age groups were: young (6–8 years), intermediate (9–12 years) and adults (13–53 years). Significance level was set at p≤0.05. Results: Thirteen (3.9%) pre-eruptive lesions were detected in 335 records. No lesions were found in the young group (7.4%), in the intermediate and adult age groups six and seven lesions were found, respectively. In most cases the pre-eruptive lesion was found in a third molar. Conclusion: The prevalence of pre-eruptive intracoronal lesions was not higher for young age groups. The prevalence of pre-eruptive intra coronal radiolucent lesions is 3.9%, irrespective of age.

scholarly journals Development and validation of a prediction model for long-term unsuccess of early treatment of Class III malocclusion

2019 ◽  
Vol 42 (2) ◽  
pp. 200-205 ◽  
Author(s):  
Bernardo Quiroga Souki ◽  
Michele Nieri ◽  
Chiara Pavoni ◽  
Helena Maria Pavan Barros ◽  
Tarcisio Junqueira Pereira ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Prediction Model ◽  
Early Treatment ◽  
Class Iii ◽  
Term Stability ◽  
Long Term Stability ◽  
Unsuccessful Treatment ◽  
Lateral Cephalograms ◽  
Bivariate Logistic Regression

Summary Aim To develop and validate a prediction model to forecast long-term stability of early treatment with rapid maxillary expansion (RME) and facemask (FM) in a large sample of Class III growing patients. Methods The Brazilian Group (BG) consisted of 73 consecutively treated Caucasian Class III patients (41 females and 32 males). Mean age at T0 (before treatment) was 7.1 ± 1.6 years, while mean age at T1 (long-term follow-up) was 21.8 ± 3.2 years. The Italian Group (IG, validation cohort) comprised 28 consecutively treated Caucasian Class III patients (14 females and 14 males, mean age at T0 9.0 ± 1.3 years and mean age at T1 18.2 ± 1.4 years). Cephalometric analysis was performed on lateral cephalograms at T0. Gender and cephalometric variables, chronologic age, and dentition phase at T0 were used as predictors for long-term unsuccessful treatment at T1. All predictors for unsuccessful treatment in the BG were subjected to bivariate logistic regression. Only those statistically significant predictors in the bivariate logistic regression entered mixed stepwise logistic regression with P = 0.05 to enter and to leave. The validity of the prediction model derived from the BG was then tested on the IG. Results The prediction model consisted of only one cephalometric variable: the angle between the Condylar Axis and the Mandibular Plane (CondAx–MP) (odds ratio: 1.52, 95% confidence interval: 1.25–1.85, P &lt; 0.0001). Unsuccessful treatment at T1 was predicted for values of CondAx–MP at T0 greater than the cut-off value of 147.8 degrees. BG patients predicted incorrectly were 3 out of 22 for the unsuccessful cases and 1 out of 51 for the successful cases. Therefore, accuracy was 0.95, sensitivity 0.86, specificity 0.98, and positive and negative predictive values were 0.95 and 0.94. When the predictive model was applied on IG, all five unsuccessful cases were predicted correctly, while only 1 out of 23 successful patients was predicted incorrectly. Conclusion CondAx-ML was identified as a reliable predictor for long-term stability of early Class III treatment with RME and FM.

Effects of surgical removal of mandibular third molar on the periodontium of the second molar

2008 ◽  
Vol 6 (2) ◽  
pp. 123-128 ◽  
Author(s):  
AJP Chaves ◽  
LR Nascimento ◽  
MEG Costa ◽  
M Franz-Montan ◽  
PA Oliveira-Júnior ◽  
...  
Keyword(s):  
Third Molar ◽  
Surgical Removal ◽  
Second Molar ◽  
Mandibular Third Molar

scholarly journals Correlationof Mandibular Second Molar Caries with Patterns of Mandibular Third Molar Impaction

2017 ◽  
Vol 4 (1) ◽  
pp. 23-27
Author(s):  
Muhammad Ilyas ◽  
Jawad Ahmad Kundi ◽  
Irtifaq Ahmad Noor ◽  
Obaid Zeb ◽  
Salman Khan
Keyword(s):  
Retrospective Study ◽  
Pearson Correlation ◽  
Third Molar ◽  
Impacted Teeth ◽  
Second Molar ◽  
Clinical Notes ◽  
Mandibular Third Molar ◽  
Vertical Impaction ◽  
Mandibular Second Molar ◽  
Head Of Department

OBJECTIVESThe aim of this study was to evaluate the relation of distal caries of second molar with patterns of impacted third molar.METHODOLOGYA retrospective study was carried out from January 2017 to June 2017.A total of 160 patients and 276 impacted teeth were selected with an age > 18 years. A single researcher assigned the diagnosis of caries and patterns of impacted teeth through clinical notes and orthopantomogram(OPG)which was reviewed by Head of Department. Winter’s and Pell and Gregory classification was used for impaction classification. The data was analyzed using SPSS 22.0 version. P ≤ 0.05 was considered as statistically significant.RESULTSFemale (56.3%) were predominant than male (43.8%) with mean age presentation was 24.2 ± 4.7 years.271 mandibular second molars were present. Vertical (64.5%) impaction was found to be the most frequent followed by mesioangular (19.6%). Pearson correlation showed that vertical impaction was significantly related to distal caries of second molar(Right side, r=.262 p=.002 and Left side, r=.240 p=.006).CONCLUSIONVertical impaction was positively related with distal caries therefore prophylactic removal of lower impacted teeth is recommended.

scholarly journals Is prophylactic extraction of mandibular third molar indicated? A retrospective study.

2020 ◽  
Author(s):  
Zhouxi Ye ◽  
Wenhao Qian ◽  
Yubo Wu ◽  
Bing Sun ◽  
Zhiyao Li ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Older Patients ◽  
Third Molar ◽  
P Value ◽  
Third Molars ◽  
Impacted Teeth ◽  
Second Molar ◽  
Mandibular Third Molar ◽  
Mandibular Second Molar ◽  
Mandibular Third Molars

Abstract Background To evaluate the associations of impaction patterns of mandibular third molars (M3Ms) with pathologies caused by them. Methods In this study, 262 patients with 432 impacted M3Ms were included. The pathologies include pericoronitis, mandibular second molar (M2M) caries, and M2M distal periodontal pathology. The impaction patterns of M3Ms and the pathologies were examined, and the M2Ms outcomes after the surgeries were evaluated. χ2 test was used to analyze the data and a P value of <0.05 was considered statistically significant. Results Pericoronitis was the major symptom in all patients, whereas the propensities of M2M distal caries and periodontal pathologies increased in older patients. Soft tissue impacted and vertically angulated teeth were more associated with the pericoronitis (p <0.05); Mesio-angular impacted teeth in less deep positions had greater risks of M2Ms distal caries (p <0.05); Mesio-angular and horizontal impacted teeth in relative deep positions were more likely to cause M2Ms distal periodontal pathologies (p <0.05). Conclusions Extractions of soft tissue impacted teeth in vertical angulations should be considered. While removals of mesially and horizontally angulated or bony impacted teeth could be delayed.

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