Second premolar extraction improves the angulation of developing third molars better than first premolar extraction among subjects undergoing comprehensive orthodontic treatment

2016 ◽  
Vol 4 (1) ◽  
pp. 46
Author(s):  
Cheshta Yadav ◽  
Ashok Kumar Utreja ◽  
Satinder Pal Singh ◽  
Ashok Kumar Jena
Keyword(s):  
Orthodontic Treatment ◽  
Third Molars ◽  
Premolar Extraction ◽  
Better Than

scholarly journals Influence of Orthodontic Treatment with Premolar Extraction on the Spatial Position of Maxillary Third Molars in Adult Patients: A Retrospective Cohort Cone-bean Computed Tomography Study

2020 ◽  
Author(s):  
Fangwei Pan ◽  
Zhentao Yang ◽  
Jian Wang ◽  
Ruilie Cai ◽  
Jialing Liu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coordinate System ◽  
Orthodontic Treatment ◽  
Spatial Position ◽  
Adult Patients ◽  
Third Molars ◽  
Premolar Extraction ◽  
The Third ◽  
Anterior Nasal Spine ◽  
Space Coordinate

Abstract Background: Based on low-dose radiation Cone-bean computed tomography (CBCT) images, This study aims to establish a space coordinate system, which offers more precise and comparable evaluation on changes of maxillary third molars influenced by orthodontic treatment with premolar extraction in adults. The system suggests promising application prospect in future studies related to CBCT superimposition and evaluation for its feasibility and efficiency.Methods: Forty-nine maxillary third molars from 27 patients (mean age, 20.78 years) were included. CBCT images were obtained before and after orthodontic treatment with premolars extracted (mean treatment duration, 31.47 months). The changes in the position, angulation, and rotation of the third molars were evaluated with a space coordinate system using four landmarks: anterior nasal spine (ANS), posterior nasal spine (PNS), left and right orbitales.Results: After orthodontic treatment, the third molars moved forward (adjusted mean, 1.44 mm) (p < 0.001) and downward (adjusted mean, 2.87 mm) (p < 0.001) accompanied by outward rotation of the crowns (adjusted mean, 5.38°) (p = 0.001), while changes in angulation were insignificant.Conclusions: This was the first study to systematically investigate the spatial position change of maxillary third molars in adult patients who received orthodontic treatment with premolar extraction. During the process, maxillary third molars moved downward and forward accompanied by outward rotation of the crowns. Orthodontists should take tooth movement potential into consideration when making extraction plans.

scholarly journals Influence of Orthodontic Treatment with Premolar Extraction on the Spatial Position of Maxillary Third Molars in Adult Patients: A Retrospective Cone-bean Computed Tomography Study

2020 ◽  
Author(s):  
Fangwei Pan ◽  
Zhentao Yang ◽  
Jian Wang ◽  
Jialing Liu ◽  
Chenghao Zhang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Orthodontic Treatment ◽  
Spatial Position ◽  
Adult Patients ◽  
Third Molars ◽  
Position Change ◽  
Premolar Extraction ◽  
The Third ◽  
Anterior Nasal Spine ◽  
Before And After

Abstract Background: The aim of this study was to evaluate the changes in position, angulation, and rotation of maxillary third molars in adults after orthodontic treatment with premolar extraction using a space coordinate system based on Cone-bean computed tomography (CBCT) images. Methods: Forty-nine maxillary third molars from 27 patients (mean age, 20.78 years) were included in the study. CBCT images were obtained before and after orthodontic treatment with premolars extracted (mean treatment duration, 31.47 months). The changes in the position, angulation, and rotation of the third molars were evaluated with a space coordinates system using four landmarks: anterior nasal spine (ANS), posterior nasal spine (PNS), left and right orbitales. Results: After orthodontic treatment, the third molars moved forward (mean, 1.44 mm) (p < 0.001) and downward (mean, 2.87 mm) (p < 0.001) accompanied by outward rotation (mean, 5.38°) of the crown (p = 0.001), but the changes in angulation were insignificant.Conclusions: This was the first study to systematically investigate the spatial position change of maxillary third molars in adult patients who received orthodontic treatment with premolar extraction. During the process, maxillary third molars moved downward and forward accompanied by outward rotation of the crown.

scholarly journals Influence of orthodontic treatment with premolar extraction on the spatial position of maxillary third molars in adult patients: a retrospective cohort cone-bean computed tomography study

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Fangwei Pan ◽  
Zhentao Yang ◽  
Jian Wang ◽  
Ruilie Cai ◽  
Jialing Liu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coordinate System ◽  
Orthodontic Treatment ◽  
Spatial Position ◽  
Adult Patients ◽  
Third Molars ◽  
Premolar Extraction ◽  
The Third ◽  
Anterior Nasal Spine ◽  
Space Coordinate

Abstract Background Based on low-dose radiation Cone-bean computed tomography (CBCT) images, This study aims to establish a space coordinate system, which offers more precise and comparable evaluation on changes of maxillary third molars influenced by orthodontic treatment with premolar extraction in adults. The system suggests promising application prospect in future studies related to CBCT superimposition and evaluation for its feasibility and efficiency. Methods Forty-nine maxillary third molars from 27 patients (mean age, 20.78 years) were included. CBCT images were obtained before and after orthodontic treatment with premolars extracted (mean treatment duration, 31.47 months). The changes in the position, angulation, and rotation of the third molars were evaluated with a space coordinate system using four landmarks: anterior nasal spine (ANS), posterior nasal spine (PNS), left and right orbitales. Results After orthodontic treatment, the third molars moved forward (adjusted mean, 1.44 mm) (p < 0.001) and downward (adjusted mean, 2.87 mm) (p < 0.001) accompanied by outward rotation of the crowns (adjusted mean, 5.38°) (p = 0.001), while changes in angulation were insignificant. Conclusions This was the first study to systematically investigate the spatial position change of maxillary third molars in adult patients who received orthodontic treatment with premolar extraction. During the process, maxillary third molars moved downward and forward accompanied by outward rotation of the crowns. Orthodontists should take tooth movement potential into consideration when making extraction plans.

scholarly journals Influence of Orthodontic Treatment with Premolar Extraction on the Spatial Position of Maxillary Third Molars in Adult Patients: A Retrospective Cohort Cone-bean Computed Tomography Study

2020 ◽  
Author(s):  
Fangwei Pan ◽  
Zhentao Yang ◽  
Jian Wang ◽  
Ruilie Cai ◽  
Jialing Liu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coordinate System ◽  
Orthodontic Treatment ◽  
Spatial Position ◽  
Adult Patients ◽  
Third Molars ◽  
Premolar Extraction ◽  
The Third ◽  
Anterior Nasal Spine ◽  
Space Coordinate

Abstract Background: Based on low-dose radiation Cone-bean computed tomography (CBCT) images, ThisThe study aims of this study was to establish a space coordinate system, which offers more precise and comparable evaluation on changes of maxillary third molars influenced by orthodontic treatment with premolar extraction in adults. The system suggests promising application prospect in future studies related to CBCT superimposition and evaluation for its feasibility and efficiency.evaluate the changes in position, angulation, and rotation of maxillary third molars in adults after orthodontic treatment with premolar extraction using a space coordinate system based on Cone-bean computed tomography (CBCT) images. Methods: Forty-nine maxillary third molars from 27 patients (mean age, 20.78 years) were included in the study. CBCT images were obtained before and after orthodontic treatment with premolars extracted (mean treatment duration, 31.47 months). The changes in the position, angulation, and rotation of the third molars were evaluated with a space coordinates system using four landmarks: anterior nasal spine (ANS), posterior nasal spine (PNS), left and right orbitales. Results: After orthodontic treatment, the third molars moved forward (adjusted mean, 1.44 mm) (p < 0.001) and downward (adjusted mean, 2.87 mm) (p < 0.001) accompanied by outward rotation (mean, 5.38°) of the crowns (adjusted mean, 5.38°) (p = 0.001), whilebut the changes in angulation were insignificant.Conclusions: This was the first study to systematically investigate the spatial position change of maxillary third molars in adult patients who received orthodontic treatment with premolar extraction. During the process, maxillary third molars moved downward and forward accompanied by outward rotation of the crowns. Orthodontists should take tooth movement potential into consideration when making extraction plans.

Orthodontic Treatment of a Cleft Palate Patient with Surgically Assisted Rapid Maxillary Expansion

1996 ◽  
Vol 33 (5) ◽  
pp. 445-449 ◽  
Author(s):  
Takafumi Susami ◽  
Takayuki Kuroda ◽  
Teruo Amagasa
Keyword(s):  
Case Report ◽  
Cleft Palate ◽  
Orthodontic Treatment ◽  
Rapid Maxillary Expansion ◽  
Third Molars ◽  
Maxillary Expansion ◽  
Anterior Maxilla ◽  
Posterior Crossbite ◽  
Palate Patient ◽  
Suture Opening

Some adult cleft palate patients show severe maxillary transverse contraction and posterior crossbite. This case report demonstrates successful surgical-orthodontic treatment of such a patient. Surgically assisted rapid maxillary expansion (SA-RME) was completed prior to comprehensive orthodontic treatment. The osteotomy was performed on both the buccal and lingual aspects of the posterior maxillary alveolus. A Hyrax-type maxillary-expansion appliance was used, and the screw (0.2 mm, one quarter turn) was turned two or three times per day. Comprehensive orthodontic treatment was initiated after extraction of the mandibular first premolars and four third molars. The maxillary lateral incisors were also extracted after active orthodontic treatment. The amount of expansion achieved using SA-RME was greater at the posterior than at the anterior maxilla. Midpalatal suture opening occurred. After orthodontic treatment, occlusal stability was satisfactory. This case demonstrates the effectiveness of SA-RME in adult cleft palate patients with severe posterior crossbite.

scholarly journals Investigation of third molar impaction in Turkish orthodontic patients: Prevalence, depth and angular positions

2013 ◽  
Vol 07 (S 01) ◽  
pp. S094-S098 ◽  
Author(s):  
Ahu Topkara ◽  
Zafer Sari
Keyword(s):  
Gender Bias ◽  
Orthodontic Treatment ◽  
Chart Review ◽  
Angular Position ◽  
Third Molar ◽  
Third Molars ◽  
Related Data ◽  
Digital Database ◽  
Orthodontic Patients ◽  
University Department

ABSTRACT Objective: We aimed to investigate the prevalence, distribution, angular position, and depth of third molar impaction in a Turkish orthodontic patient population. Materials and Methods: We retrospectively reviewed the panoramic radiographs, intraoral photographs, and dental casts of 207 patients (62 men and 145 women; age 20-39 years) who had undergone orthodontic treatment at a university department of orthodontics for impacted third molars (ITMs). A comprehensive chart review of all subjects was conducted. Patient and treatment-related data were recorded in a digital database for comparative analysis. Results: The prevalence of ITMs was 54.1%, and no statistically significant gender differences were evident (61.3% in men and 51.0% in women; P = 0.23). The frequency of maxillary ITMs was 49.3% (148 of 300 teeth) while that of mandibular ITMs was 50.7% (152 of 300 teeth). The most frequently observed angulations of impaction were mesioangular for the mandible (65.1%), and distoangular for the maxilla (64.2%). Of all the ITMs analysed, 61% were partially buried in bone and 39% were completely buried. Conclusions: Third molar impaction was evident in 54.1% of a group of Turkish orthodontic patients aged 20-39 years, and there was no statistically significant gender bias. Mesioangular and distoangular inclinations were the most common in the mandible and the maxilla, respectively.

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