scholarly journals Possibilty of the lower third molar eruption: Radiographic analysis

2006 ◽  
Vol 63 (2) ◽  
pp. 159-162
Author(s):  
Nenad Nedeljkovic ◽  
Zorana Stamenkovic ◽  
Zoran Tatic ◽  
Alek Racic
Keyword(s):  
Third Molar ◽  
Occlusal Plane ◽  
Third Molars ◽  
The Third ◽  
Crown Width ◽  
Significant Difference ◽  
Mutual Relations ◽  
The Right ◽  
B Lines ◽  
Third Molar Eruption

Backgraund/Aim. To assess the possibility of the eruption of the lower third molar on the basis of the measured parameters: retromolar space, mesiodistal crown width of a molar and the third molar angulation. Methods. The investigation included 104 patients both sexes (43 boys, and 61 girls), 16 to 25 years old (meanage, 18 years). It was performed using the orthopanthomographic radiographs analysis of those patients. Each radiograph was covered by tracing paper, and the contoures of the followiny anatomic details were drawn: a) the crown and root contours of third molars, upper and lower central incisors, distal molars in occlusion, anterior edge of ramus mandible, b) lines: 1. the occlusal plane, 2. the line of retromolar space, 3. the mesiodistal crown width of third molar, 4. the axial shaft of the third molar and the distal angle between occlusal plane and the axial shaft of the third molar. The values were measured with an orthodontic caliper: the diameter of retromolar space, diameter of mesiodistal width, the value of distal angle between occlusal plane and axial shaft of molar. Results. A favourable angulation of the lower third molar (more than 60?) was found in, boys (left 27.90%, right 32.55%), girls (left 39.34%, right 37.77%). A favourable relationship between the diameters of mesiodistal width of the third molar and retromolar space was found in, boys, (left 13.59%, right 16.27%), girls, (left 8.19%, right 14.75%). A favorable relationship between the diameters of mesiodistal width of the third molar and the retromolar space and the angulation was found in boys, (left 9.30%, right 11.62%), girls, (left 6.56%, right 9.83%). Conclusion. There was not any statistically significant difference found between the relation of the retromolar value, third molar mesiodistal diameter, or of the third molar angulation to the left and the right side nor of their mutual relations in comparing boys and girls. A favorable prognosis was found in 9.33% of the patients.

scholarly journals Effects of Extraction and Nonextraction Treatment on Third Molar Angulation

2015 ◽  
Vol 5 (1) ◽  
pp. 17-21
Author(s):  
Ajay Sudhakar Nitturkar ◽  
Sachin Doshi ◽  
Girish Karandikar ◽  
Samay Tahilramani ◽  
Bhavisha Gandhi
Keyword(s):  
Third Molar ◽  
Positive Influence ◽  
Occlusal Plane ◽  
Third Molars ◽  
Premolar Extraction ◽  
The Third ◽  
Significant Difference ◽  
The Mean ◽  
Mandibular Third Molars ◽  
The Right

ABSTRACT Objective To compare the angular changes in the developing third molars in both first premolar extraction and nonextraction cases and to determine if premolar extraction results in greater mesial movement of mandibular buccal segment and also causes favorable rotational changes in the third molar tip, which can improve later eruption of the third molars. Materials and Methods Pretreatment (T1) and post-treatment (T2) panoramic radiographs were obtained 31 subjects were taken who had been treated by extraction of all first premolars and for 21 subjects treated with nonextraction theray. Occlusal plane was used to measure and compare the changes in the angles of the developing maxillary and mandibular third molars. Results The mean uprighting of the third molars seen in the extraction group was 8.7° ± 10.29° and 2.97° ± 11.11° on the right side, and 5.14° ± 9.04° and 2.77° ± 12.10° on the left side following treatment (T2 – T1). For the nonextraction group, the mean difference was – 1.52 ± 6.43 and – 6.430 ± 12.21° on the right side, and – 3.90° ± 7.67° and – 5.7° ± 7.23° on the left side. There was a statistically significant difference between the groups (p < 0.001). Conclusion Premolar extractions had a positive influence on the developing third molar angulations. Nonextraction therapy did not have any adverse effects. How to cite this article Nitturkar AS, Doshi S, Krishnan RV, Karandikar G, Tahilramani S, Gandhi B. Effects of Extraction and Nonextraction Treatment on Third Molar Angulation. J Contemp Dent 2015;5(1):17-21.

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.

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.

scholarly journals Third Molar Eruption Mechanisms and Patterns

2016 ◽  
Vol 4 (1) ◽  
pp. 11-16
Author(s):  
Winnie Zhang
Keyword(s):  
Molecular Mechanisms ◽  
Third Molar ◽  
Radiographic Examination ◽  
Third Molars ◽  
The Third ◽  
Occlusal Surfaces ◽  
Surgical Extraction ◽  
Incipient Caries ◽  
The Moment ◽  
Third Molar Eruption

Third molars are highly variable in their presence and form. This report focuses on a horizontally impacted third molar and analyzes the potential etiology of this situation. Upon a clinical and radiographic examination, it was noted that the patient had four third molars present. The patient’s third molars began erupting around the age of 19. Currently, they are asymptomatic with incipient caries on the occlusal surfaces. While three of the third molars erupted in a normal orientation, one of the third molars (mandibular left) erupted in an orientation that would be classified as horizontal and/or mesio-angular. No treatment has been undertaken at the moment, however surgical extraction can be recommended with the prognosis being very good. For the clinician that has to treat dental complications that arise from abnormal tooth eruption, as seen in numerous genetic and acquired disorders, knowledge about the basic molecular mechanisms involved may become extremely important.

scholarly journals A Cohort Study of the Patterns of Third Molar Impaction in Panoramic Radiographs in Saudi Population

2017 ◽  
Vol 11 (1) ◽  
pp. 648-660 ◽  
Author(s):  
Mahmoud Al-Dajani ◽  
Anas O Abouonq ◽  
Turki A Almohammadi ◽  
Mohammed K Alruwaili ◽  
Rayan O Alswilem ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Cohort Study ◽  
Third Molar ◽  
Northern Region ◽  
Health Concern ◽  
Occlusal Plane ◽  
Third Molars ◽  
The North ◽  
Significant Difference ◽  
Vertical Impaction

Objectives: To evaluate the epidemiological patterns of third molar impaction in a cohort of patients living in the north of Saudi Arabia. Materials and Methods: A retrospective cohort study comprised of analysing 2550 Orthopantomograms (OPGs) belonging to patients who attended Aljouf University College of Dentistry between September 2013 and December 2015. OPGs were examined to determine the frequency of third molar impaction, their levels of eruption and angulations. Mixed effects logistic regression analysis was performed to calculate adjusted odds ratios. Data were weighted by age and sex based on population regional estimates. Results: 1551 patients (60.8%) with a mean age of 33.5 years-old (95%CI: 32.9 to 34) demonstrated 2650 impacted third molars. Third molars were more likely present in patients aged from 20 to 39 years-old (p<0.001); and in mandible more than maxilla (p<0.001). It showed highest vertical impaction and higher impaction rate in mandible than maxilla. Level A impaction was the most common among other levels by 1365 (53.5%). Vertical impaction was the most common pattern (1354 patients; 53.1%). Mesioangular impaction ranked second in mandible, while distoangular impaction ranked second in maxilla. There was no statistically significant difference between males and females concerning impaction frequency, depth levels and angulations. Conclusion: Impacted third molars is still a public health concern among youth and young adults. Vertically impacted mandibular third molars with their occlusal plane at the same level as the occlusal plane of adjacent tooth is the most prevalent pattern of third molar impaction in the northern region of Saudi Arabia.

scholarly journals Artificial Intelligence (AI)-Driven Molar Angulation Measurements to Predict Third Molar Eruption on Panoramic Radiographs

2020 ◽  
Vol 17 (10) ◽  
pp. 3716 ◽  
Author(s):  
Myrthel Vranckx ◽  
Adriaan Van Gerven ◽  
Holger Willems ◽  
Arne Vandemeulebroucke ◽  
André Ferreira Leite ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Intelligence ◽  
Third Molar ◽  
Automated Measurement ◽  
Third Molars ◽  
Panoramic Radiographs ◽  
The Third ◽  
Clinically Significant ◽  
Reference Measurements ◽  
Third Molar Eruption

The purpose of the presented Artificial Intelligence (AI)-tool was to automatically segment the mandibular molars on panoramic radiographs and extract the molar orientations in order to predict the third molars’ eruption potential. In total, 838 panoramic radiographs were used for training (n = 588) and validation (n = 250) of the network. A fully convolutional neural network with ResNet-101 backbone jointly predicted the molar segmentation maps and an estimate of the orientation lines, which was then iteratively refined by regression on the mesial and distal sides of the segmentation contours. Accuracy was quantified as the fraction of correct angulations (with predefined error intervals) compared to human reference measurements. Performance differences between the network and reference measurements were visually assessed using Bland−Altman plots. The quantitative analysis for automatic molar segmentation resulted in mean IoUs approximating 90%. Mean Hausdorff distances were lowest for first and second molars. The network angulation measurements reached accuracies of 79.7% [−2.5°; 2.5°] and 98.1% [−5°; 5°], combined with a clinically significant reduction in user-time of >53%. In conclusion, this study validated a new and unique AI-driven tool for fast, accurate, and consistent automated measurement of molar angulations on panoramic radiographs. Complementing the dental practitioner with accurate AI-tools will facilitate and optimize dental care and synergistically lead to ever-increasing diagnostic accuracies.

scholarly journals Influence of First Premolar Extraction on Mandibular Third Molar Angulation

2009 ◽  
Vol 79 (6) ◽  
pp. 1143-1148 ◽  
Author(s):  
Suruchi Jain ◽  
Ashima Valiathan
Keyword(s):  
Third Molar ◽  
Positive Influence ◽  
Reference Plane ◽  
Third Molars ◽  
Premolar Extraction ◽  
Mandibular Third Molar ◽  
Significant Difference ◽  
The Mean ◽  
Mandibular Third Molars ◽  
The Right

Abstract Objective: To compare the angular changes in the developing mandibular third molars in both first premolar extraction and nonextraction cases and to determine whether premolar extraction results in a more mesial movement of the mandibular buccal segment and causes favorable rotational changes in the mandibular third molar tilt, which can enhance later eruption of the third molars. Materials and Methods: Pretreatment (T1) and posttreatment (T2) panoramic radiographs were taken of 25 subjects who had been treated by the extraction of all the first premolars and 25 subjects who had been treated with nonextraction. The horizontal reference plane was used to measure and compare the changes in the angles of the developing mandibular third molars. Results: The mean uprighting of the mandibular third molars seen in the extraction group was 8.2 ± 5.4 degrees on the left side and 6.3 ± 6.5 degrees on the right side following treatment (T2 − T1). For the nonextraction group the mean difference was 1.3 ± 4.3 degrees on the left side and 1.7 ± 5.4 degrees on the right side. There was a statistically significant difference between the groups (P = .012 on the right side and P &lt; .001 on the left side). Conclusions: Premolar extractions had a positive influence on the developing third molar angulations. Nonextraction therapy did not have any adverse effects.

scholarly journals Clinical study of the lower third molars eruption level influence on incidence of acute infection

2005 ◽  
Vol 52 (2) ◽  
pp. 83-89
Author(s):  
Stevo Matijevic ◽  
Marjan Marjanovic
Keyword(s):  
Clinical Study ◽  
Acute Infection ◽  
Third Molar ◽  
Occlusal Plane ◽  
Third Molars ◽  
Common Cause ◽  
Radiographic Diagnosis ◽  
The Third ◽  
Age Range ◽  
Infective Complications

The aim of this paper was estimate if there was correlation between clinically and radiographically evaluated eruption level of the lower third molar and incidence and severity of the acute infection, respectively. Methods and material: The study was conducted in 100 male examinees, age range from 18 to 25 years old, with clinical and radiographic diagnosis of partially erupted or non erupted third molars. Results: Total number of examinees with clinically registered partially erupted lower third molars was 75, of which 62 (82.6%) manifested infection. Non erupted third molars were in 25 examinees of which 11 (44%) had signs of infection. Partial eruption stage of the third molar was the most common cause of the light infection form (68.8%). Infective complications in over 60% of examinees were related to higher levels of teeth eruption. Higher eruption positions of lower third molars were causing light infections in 56.1%, and in 31.5% - severe forms of infection. Most frequently, lower third molar was related to occurrence and severity of the infection when positioned in occlusal plane level. Conclusion: Partially erupted lower third molar, when positioned in occlusal plane level, is the high risk tooth for an infection to occur.

Third-Molar Agenesis among Patients from the East Anatolian Region of Turkey

2010 ◽  
Vol 11 (4) ◽  
pp. 33-40 ◽  
Author(s):  
Fatih Kazanci ◽  
Mevlut Celikoglu ◽  
Ozkan Miloglu ◽  
Husamettin Oktay
Keyword(s):  
Third Molar ◽  
Third Molars ◽  
Congenital Deformities ◽  
Third Molar Agenesis ◽  
Significant Difference ◽  
Chi Squared ◽  
Orthodontic Patients ◽  
Molar Teeth ◽  
Spss Software ◽  
The Right

Abstract Aim The aim of this study was to determine the frequency and distribution of third-molar agenesis in orthodontic patients from the East Anatolian Region of Turkey. Methods and Materials Our data were obtained from the panoramic radiographs of the 2,579 patients 12 to 16 years of age in the Department of Orthodontics at the Atatürk University in Erzurum, Turkey. Subjects with congenital deformities, such as a cleft palate, were excluded from the study. Statistical analysis was performed using SPSS software and a chi-squared test. Results Of the 2,579 subjects, 1,964 (76.2 percent) had all four third-molar teeth, 238 (9.2 percent) had three, 214 (8.3 percent) had two, 66 (2.6 percent) had one third molar, and 97 (3.8 percent) had agenesis of all third-molar teeth. There was no significant difference in agenesis of third-molar teeth between the right and left sides and no gender predilection was noted. However, significantly more third-molar teeth were found to be missing from the maxilla compared to the mandible, with a ratio of approximately 1.5:1. Conclusion According to our results, the absence of one third molar is the most frequently detected pattern in the East Anatolian population. Additionally, the absence of third molars is more frequent in the maxilla than the mandible. Clinical Significance To date no information about third-molar agenesis in the East Anatolian population from Turkey is documented. This is believed to be the first known study on this subject in this population. Citation Kazanci F, Celikoglu M, Miloglu O, Oktay H. Third-Molar Agenesis among Patients from the East Anatolian Region of Turkey. J Contemp Dent Pract [Internet]. 2010 July; 11(4):033-040. Available from: http://www.thejcdp. com/journal/view/volume11-issue4-kazanci

scholarly journals X-RAY ANALYSIS OF THE POSITION OF THE RUDIMENTS OF ABNORMALLY LOCATED LOWER THIRD MOLARS DURING THEIR FORMATION AND GROWTH

2020 ◽  
Vol 16 (1) ◽  
pp. 108-113
Author(s):  
Marina Morozova ◽  
Svetlana Dem'yanenko ◽  
Natalia Marchenka ◽  
Vyacheslav Kirichenko ◽  
Ekaterina Romanova ◽  
...  
Keyword(s):  
Negative Impact ◽  
Third Molar ◽  
Occlusal Plane ◽  
Optimal Timing ◽  
Third Molars ◽  
Measuring Device ◽  
X Ray ◽  
Second Molar ◽  
The Third ◽  
Negative Effect

Subject. The issues of indications, contraindications and the optimal timing for the removal of abnormally located lower third molars remain relevant in dentistry. Numerous evidence has been accumulated of their negative impact on the formation of the dentofacial system, however, X-ray patterns of patients with this pathology in the process of their formation, development and change in the angle of inclination, as well as the growing problems associated with the growth of these teeth in the dentition and bite have not been studied. The goal is to study the dynamics of the position of the rudiments of the abnormally located lower third molars in the process of their formation and growth and their influence on the state of the dentofacial system as a whole. Methodology. The study involved 28 patients with abnormally located impressive lower third molars, which were divided into 3 groups: in the first (8 people), the second molars were at the teething and growth stage, in the second (12 people) the second molar was in the occlusal plane at the stage closed apex, in the third (8 people) there was a multiple abnormal position of the mesially located teeth from the third molar. All measurements were performed using a virtual measuring device in the image mode of slices with Galileos Viewer software. Results. According to our results, a significant scatter was recorded in the timing of the formation of third molars from the period of mineralization of the crown of the teeth (12―15 years) to the end of growth and root formation (18―23 years). After 23 years, the roots of the abnormally located lower third molars in the patients examined by us had radiological signs of the end of formation (closed apex). Conclusion. Impact lower third molars continue their growth and have a negative effect on the condition of the teeth located mesial. This fact does not depend on concomitant orthodontic pathology, nor on the methods of orthodontic treatment (removable or non-removable equipment).

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