scholarly journals The association between orthodontic treatment with removal of premolars and the angulation of developing mandibular third molars over time

2012 ◽  
Vol 83 (3) ◽  
pp. 376-380 ◽  
Author(s):  
Bradly Russell ◽  
Mark Skvara ◽  
Eric Draper ◽  
William R. Proffit ◽  
Ceib Philips ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Treatment Plan ◽  
Third Molar ◽  
Linear Mixed Effect Model ◽  
Vertical Position ◽  
Third Molars ◽  
Mixed Effect ◽  
Mandibular Third Molar ◽  
Mandibular Third Molars ◽  
Over Time

ABSTRACT Objective: To assess changes in mandibular third molar angulation during orthodontic treatment in subjects having either first or second premolars or neither removed. Materials and Methods: In a retrospective study approved by the institutional review board, right and left mandibular third molar angulations were compared to the vertical axis of adjacent second molars before and at the end of orthodontic treatment. The sample included 25 subjects with first premolars removed, 25 subjects with second premolars removed, and 24 subjects with no premolars removed. A decrease in angulation over time of at least 5°, so that the third molar became more vertical, was considered clinically favorable. Data were assessed by a linear mixed effect model and a proportional odds model with significance set at P < .05. Results: Prior to treatment, the average mandibular third molar angulation did not differ significantly among the three study groups (P  =  .97). The average change during treatment was not significantly affected by group (P  =  .59), but a higher proportion of mandibular third molars were more vertical by at least 5° in the second premolar extraction group compared to the other two groups at the completion of treatment. Conclusion: Although creating space for third molars to erupt and function has intuitive appeal, clinicians should not assume that third molars will move upright to a vertical position even if premolar removal is performed as part of an orthodontic treatment plan.

scholarly journals The ability of orthodontists and maxillofacial surgeons in predicting spontaneous eruption of mandibular third molar using panoramic serial radiographs

2020 ◽  
Vol 25 (4) ◽  
pp. 68-74
Author(s):  
Mylena Ranieri Libdy ◽  
Nicole Melres Rabello ◽  
Leandro Silva Marques ◽  
David Normando
Keyword(s):  
Orthodontic Treatment ◽  
Third Molar ◽  
Panoramic Radiograph ◽  
Third Molars ◽  
The Third ◽  
Mandibular Third Molar ◽  
Panoramic Analysis ◽  
Orthodontic Patients ◽  
Mandibular Third Molars

ABSTRACT Objective: To evaluate the skill of orthodontists and oral/maxillofacial surgeons (OMFS) in providing a prognosis of mandibular third molars spontaneously erupted, through follow-up panoramic analysis. Methods: 22 orthodontic patients treated without extraction, presenting spontaneously erupted mandibular third molars (n = 44) were analyzed through panoramic serial radiographs. The first panoramic radiograph was obtained just after orthodontic treatment (PR1), in patients aging from 13 to 19 years. A second panoramic radiograph (PR2), was obtained in average two years later. The radiographs were randomly analyzed by 54 specialists, 27 orthodontists and 27 OMFS, to obtain the opinion about the approach to be adopted to these teeth in PR1. Then, another opinion was collected by adding a serial radiograph (PR1+2). Results: The concordance of the answers was moderate for OMFS (Kappa 0.44; p< 0.0001) and significant for orthodontists (Kappa 0.39; p< 0.0001). In the analysis of the first radiograph (PR1) of the spontaneously erupted molars, OMFS indicated extraction in 44.5% of cases, while orthodontists indicated in 42%, with no difference between groups (p= 0.22). In PR1+2 analysis, orthodontists maintained the same level of extraction indication (45.6%, p= 0.08), while surgeons indicated more extractions (63.2%, p< 0.0001). Conclusions: Orthodontists and OMFS were not able to predict the eruption of the third molars that have erupted spontaneously. Both indicated extractions around half of the third molars. A follow-up analysis, including one more radiograph, did not improve the accuracy of prognosis among orthodontists and worsened for OMFS.

EXTRATION OF MANDIBULAR THIRD MOLARS, A CORRELATION BETWEEN THE SURGICAL TECHNIQUE AND WINTER’S

2018 ◽  
Vol 28 (2) ◽  
pp. 407-413
Author(s):  
Zaklina Menceva ◽  
Biljana Evrosimovska ◽  
Aneta Terzievska ◽  
Daniela Veleska Stevkovska ◽  
Bogdan Ilievski
Keyword(s):  
Surgical Technique ◽  
Third Molar ◽  
Vertical Position ◽  
Third Molars ◽  
Anatomical Structures ◽  
Mandibular Third Molar ◽  
Flap Design ◽  
Impacted Mandibular Third Molars ◽  
Mandibular Third Molars ◽  
Selection Of

Total and partial impaction of the teeth is considered to be a developmental anomaly, that can affect any tooth in both deciduous and permanent dentition, but according to a large number of dental authors it is mostly associated with the mandibular third molars. Its multifactorial etiology, diagnostics, oral surgical approach and techniques can increase the difficulties of this problem which is encountered in the everyday oral surgical practice.The selection of the appropriate oral surgical technique mostly depends on the various positions in which the total or partial impacted mandibular third molar may appear and his correlation with the adjacent anatomical structures, thus leading to different diagnostic and therapeutic problems.This study includes 80 patients, divided in two groups of 40 patients, where one group is diagnosed with a total impaction and the other group with a partial impaction of the mandibular third molars.After a statistical analysis of the obtained data was performed with the help of appropriate world renowned classifications concerning the position of the impacted mandibular third molars, we came to the following results: according to Winter’s classification, the impacted molars where dominantly in a vertical position; Axhausen’s flap design was dominantly a method of choice; buccodistal osteotomy is the most frequently used technique; the impacted molars presented a convergent anatomical configuration of the roots in most of the cases.

scholarly journals Mesial Migration Effect on Root Morphology of Mandibular Third Molars

2007 ◽  
Vol 77 (1) ◽  
pp. 73-76 ◽  
Author(s):  
A. Altuğ Bıçakçı ◽  
Oral Sökücü ◽  
Hasan Babacan ◽  
H. Hüseyin Köşger
Keyword(s):  
Third Molar ◽  
Root Apex ◽  
Central Line ◽  
Occlusal Plane ◽  
Third Molars ◽  
Migration Effect ◽  
Mandibular Third Molar ◽  
Root Curvature ◽  
History Of ◽  
Mandibular Third Molars

Abstract Objective: To test the hypothesis that there is a relationship between forward mandibular third molar migration and root curvature of the mandibular third molars. Materials and Methods: The study is comprised of 64 patients who had a history of unilateral mandibular first molar extraction before 16 years of age with no other missing teeth or prosthetic restorations in the mandible. The extraction space was fully or partly closed. The mean remaining space was 1.1 ± 0.41 mm. The root angles for the mesial and distal roots of the mandibular third molars were measured on the panoramic radiographs by calculating the differences between the angle formed by the long axis drawn perpendicular to the occlusal plane of the crown of mandibular third molar and the central line of the lower one ninth of the root through the root apex. The differences between the extracted and nonextracted sides for mesial and distal roots were analyzed using a paired sample t-test. Results: Both mesial and distal roots were approximately 8° more vertical on the extraction sides than on the nonextraction sides. The differences were statistically significant. Conclusion: Mesial tooth migration of mandibular third molars reduces the amount of root curvature developing on this tooth.

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 Retained Third Molars Removal in a Severely Resorbed Edentulous Mandible. A Case Report

2013 ◽  
Vol 24 (5) ◽  
pp. 532-536 ◽  
Author(s):  
Cassio Edvard Sverzut ◽  
Alexandre Elias Trivellato ◽  
Alexander Tadeu Sverzut ◽  
Marcelo Rodrigues Azenha ◽  
Marco Aurélio Kenichi Yamaji ◽  
...  
Keyword(s):  
Potential Problem ◽  
Preventive Measures ◽  
Treatment Plan ◽  
Third Molar ◽  
Surgical Removal ◽  
Third Molars ◽  
Edentulous Mandible ◽  
Mandibular Body ◽  
Mandibular Third Molars ◽  
Tooth Removal

The presence of asymptomatic third molars can represent a potential problem in the mandible when these teeth are retained and the patient has lost all normally erupted teeth. Once the mandibular first and second molars are removed, the mandibular body becomes weaker with time, increasing the complexity, morbidity and incidence of complication in the surgical procedure to remove the retained third molar. This paper reports a case where the mandibular third molars retained in a severely resorbed mandible were removed in a 54-year-old female patient. The treatment plan was based on the safe surgical removal of the teeth and prosthetic rehabilitation with an implant-supported milled bar overdenture and a bone-mucous-supported complete denture in the mandibular and maxillary arch, respectively. If the removal of a retained third molar is indicated in a severely resorbed edentulous mandible, the treatment plan must involve not only preventive measures in order to avoid mandible fracture during or after tooth removal, but also alternatives that allow an adequate mandibular rehabilitation.

scholarly journals Calcifying cystic odontogenic tumor in radiologically normal dental follicular space of mandibular third molars: report of two cases

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Gargi S. Sarode ◽  
Sachin C. Sarode ◽  
Ghevaram Prajapati ◽  
Mahesh Maralingannavar ◽  
Shankargouda Patil
Keyword(s):  
Cell Transformation ◽  
Histopathological Examination ◽  
Third Molar ◽  
Odontogenic Tumor ◽  
Third Molars ◽  
Radiographic Evidence ◽  
Odontogenic Epithelium ◽  
Mandibular Third Molar ◽  
One Year ◽  
Mandibular Third Molars

Two cases of calcifying cystic odontogenic tumor (CCOT) of the dental follicle in an impacted third molar without clinical and radiological evidence are reported during routine histopathological examination. In both the cases left mandibular third molar was mesioangularly impacted with pericoronal radiolucency of less than 2.5 mm, which was not indicative of any pathology. As a routine protocol (which is not practiced widely) of our institution, dental follicles associated with extracted molars were sent for histopathological examination. Histopathological features were consistent with CCOT with pathognomonic ghost cell transformation of odontogenic epithelium. The patients were followed for one year with no recurrence. This paper emphasizes the importance of routine histopathological examination of dental follicles associated with asymptomatic impacted teeth without any clinical or radiographic evidence of follicular lesion.

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.

scholarly journals Presence and Maturation Dynamics of Mandibular Third Molars and Their Influence on Late Mandibular Incisor Crowding: Longitudinal Study

2021 ◽  
Author(s):  
Martina Žigante ◽  
Andrej Pavlic ◽  
Luka Morelato ◽  
Vaska Vandevska-Radunovic ◽  
Stjepan Spalj
Keyword(s):  
Third Molar ◽  
Third Molars ◽  
Mandibular Incisor ◽  
Dental Maturation ◽  
The Third ◽  
Irregularity Index ◽  
Mandibular Third Molar ◽  
Mandibular Third Molars ◽  
Dental Plaster ◽  
The Relationship

Abstract OBJECTIVE: To investigate the relationship between the presence and dynamics of mandibular third molar development and the occurrence and amount of late mandibular incisor crowding. MATERIALS AND METHODS: Dental plaster casts and panoramic radiographs of 72 orthodontically untreated subjects from the Nittedal growth study, Norway were analysed. The subjects were recalled for check-up at 12, 15, 18 and 21 years of age. Mandibular incisor crowding was assessed using the Little’s irregularity index and dental maturation of the third molars by the Cameriere’s index.RESULTS: The majority of the subjects (64%) had ≥1mm increase in irregularity; 22% experienced increase of 0.1-0.9mm and 14% had unchanged or decreased irregularity. Incisor irregularity increased with age, regardless of absence or presence of third molars. The amount of change in incisor irregularity from 12 to 21 years did not differ significantly between subjects with hypodontia of third molars, extraction and those with third molars present. No differences were observed between erupted, unerupted or impacted third molars. No correlation was found between the amount of change in irregularity and maturation of the third molars.CONCLUSIONS: Occurrence and amount of mandibular late incisor crowding is not significantly influenced by presence or development dynamics of mandibular third molars.

scholarly journals Correlation Between the Maturation Stages of Mandibular Third Molars and Chronological Age in Patients Visiting Sardar Begum Dental College, Peshawar

2019 ◽  
Vol 5 (2) ◽  
pp. 3-7
Author(s):  
Muhammad Ilyas ◽  
Asma Khan ◽  
Syed Murad Ali Shah ◽  
Salman Khan ◽  
Junaid Nadeem Malik
Keyword(s):  
Pearson Correlation ◽  
Third Molar ◽  
Cross Sectional Study ◽  
Chronological Age ◽  
P Value ◽  
Third Molars ◽  
Cross Sectional ◽  
Mandibular Third Molar ◽  
Maturation Stages ◽  
Mandibular Third Molars

OBJECTIVES: The objective of this study was to determine the correlation of chronological age with the maturation stages of mandibular third molar. METHODOLOGY: This descriptive, cross-sectional study was conducted at Sardar Begum Dental College, Gandhara University Peshawar on 384 patients from January 2018 to June 2018 and included patients having age 11-26 years with good quality Orthopantomogram showing mandibular third molar tooth germs bilaterally. Data were analyzed using SPSS version 22. p ≤ 0.05 was considered as statistically significant. RESULTS: Females 286 (74.5%) were predominant than males 98 (25.5%) with mean age presentation of 18.12±3.03 years. The most frequent stage of Demirjian’s stages of mandibular third molar was stage F (24.7%). Pearson correlation showed that maturation stages of mandibular third molars were significantly related to the chronological age ( r=0.446, p value=0.00). CONCLUSION: A correlation between maturation stages of mandibular third molars and chronological age existed.

scholarly journals Automated Prediction of Extraction Difficulty and Inferior Alveolar Nerve Injury for Mandibular Third Molar Using a Deep Neural Network

2022 ◽  
Vol 12 (1) ◽  
pp. 475
Author(s):  
Junseok Lee ◽  
Jumi Park ◽  
Seong Yong Moon ◽  
Kyoobin Lee
Keyword(s):  
Maxillofacial Surgery ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Oral And Maxillofacial Surgery ◽  
Third Molars ◽  
Radiographic Image ◽  
Common Procedure ◽  
Radiographic Images ◽  
Mandibular Third Molar ◽  
Mandibular Third Molars

Extraction of mandibular third molars is a common procedure in oral and maxillofacial surgery. There are studies that simultaneously predict the extraction difficulty of mandibular third molar and the complications that may occur. Thus, we propose a method of automatically detecting mandibular third molars in the panoramic radiographic images and predicting the extraction difficulty and likelihood of inferior alveolar nerve (IAN) injury. Our dataset consists of 4903 panoramic radiographic images acquired from various dental hospitals. Seven dentists annotated detection and classification labels. The detection model determines the mandibular third molar in the panoramic radiographic image. The region of interest (ROI) includes the detected mandibular third molar, adjacent teeth, and IAN, which is cropped in the panoramic radiographic image. The classification models use ROI as input to predict the extraction difficulty and likelihood of IAN injury. The achieved detection performance was 99.0% mAP over the intersection of union (IOU) 0.5. In addition, we achieved an 83.5% accuracy for the prediction of extraction difficulty and an 81.1% accuracy for the prediction of the likelihood of IAN injury. We demonstrated that a deep learning method can support the diagnosis for extracting the mandibular third molar.

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