Mesioangular impacted lower third molars: angulation before and after orthodontic treatment with premolar extraction

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.

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Geometric analysis of alveolar bone around the incisors after anterior retraction following premolar extraction

The Angle Orthodontist ◽

10.2319/041419-266.1 ◽

2019 ◽

Vol 90 (2) ◽

pp. 173-180 ◽

Cited By ~ 1

Author(s):

Fan Zhang ◽

Suk-Cheol Lee ◽

Jun-Beom Lee ◽

Kyung-Min Lee

Keyword(s):

Orthodontic Treatment ◽

Alveolar Bone ◽

Shape Change ◽

Geometric Analysis ◽

Careful Consideration ◽

Mandibular Incisor ◽

Premolar Extraction ◽

Significant Difference ◽

Before And After ◽

Mandibular Incisors

ABSTRACT Objective: To evaluate changes in shape and alterations in thickness and vertical marginal bone levels of the alveolar bone around the maxillary and mandibular incisors before and after orthodontic treatment with premolar extraction using geometric morphometric analysis. Materials and Methods: Thirty-six patients with Class I bialveolar protrusion who underwent orthodontic treatment with premolar extraction were included. Cone-beam computed tomographic scans were obtained from the patients before and after treatment. Five fixed landmarks and 70 semilandmarks were used to represent the morphology of the alveolar bone around the maxillary and mandibular incisors. The coordinates of the landmarks of the alveolar bones were generated by Procrustes fit. The labial and lingual alveolar bone thicknesses around the maxillary and mandibular incisors and vertical marginal bone level were assessed quantitatively. Results: There was a significant difference in shape change of the alveolar bone before and after treatment. The deformation grid of the thin plate spline showed that the thickness and vertical marginal bone decreased on the lingual side after treatment. Shape changes were greater for the lingual alveolar bone on the mandibular incisor than for the maxillary incisors. Conclusions: Orthodontic treatment with premolar extraction might cause loss of alveolar bone around the maxillary and mandibular incisors. Careful consideration is needed to avoid iatrogenic degeneration of periodontal support around the incisors, particularly in the lingual area.

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

Journal of Dental Specialities ◽

10.5958/2393-9834.2016.00009.7 ◽

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

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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

10.21203/rs.3.rs-30799/v3 ◽

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.

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Anchorage condition during canine retraction using transpalatal arch with continuous and segmented arch mechanics

The Angle Orthodontist ◽

10.2319/050615-306.1 ◽

2015 ◽

Vol 86 (3) ◽

pp. 380-385 ◽

Cited By ~ 2

Author(s):

Adel Alhadlaq ◽

Thamer Alkhadra ◽

Tarek El-Bialy

Keyword(s):

Orthodontic Treatment ◽

The Other ◽

Cephalometric Analysis ◽

Forward Movement ◽

Maxillary Canine ◽

Premolar Extraction ◽

Canine Retraction ◽

Before And After ◽

Point Data ◽

Transpalatal Arch

ABSTRACT Objective: To compare anchorage condition in cases in which transpalatal arch was used to enhance anchorage in both continuous and segmented arch techniques. Materials and Methods: Twenty cases that required first premolar extraction for orthodontic treatment and transpalatal arch to enhance anchorage were included in this study. Ten cases were treated using the continuous arch technique, while the other 10 cases were treated using 0.019 × 0.025-inch TMA T-loops with posterior anchorage bend according to the Burstone and Marcotte description. Lateral cephalometric analysis of before and after canine retraction was performed using Ricketts analysis to measure the anteroposterior position of the upper first molar to the vertical line from the Pt point. Data were analyzed using an independent sample t-test. Results: There was a statistically significant forward movement of the upper first molar in cases treated by continuous arch mechanics (4.5 ± 3.0 mm) compared with segmented arch mechanics (−0.7 ± 1.4 mm; P = .01). Conclusions: The posterior anchorage bend to T-loop used to retract the maxillary canine can enhance anchorage during maxillary canine retraction.

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Posisi kondilus setelah perawatan ortodontik pada maloklusi kelas II divisi 1 dengan pencabutan premolarCondylar position after orthodontic treatment in class II division 1 malocclusion with premolar extraction

Jurnal Kedokteran Gigi Universitas Padjadjaran ◽

10.24198/jkg.v33i1.30643 ◽

2021 ◽

Vol 33 (1) ◽

pp. 59

Author(s):

Dhani Ayu Andini ◽

Maria Purbiati ◽

Nia Ayu Ismaniati Suria ◽

Ira Tanti

Keyword(s):

Temporomandibular Joint ◽

Orthodontic Treatment ◽

Joint Space ◽

Class Ii ◽

Temporomandibular Joint Disorders ◽

Premolar Extraction ◽

Division 1 ◽

Before And After ◽

The Right ◽

Class Ii Division 1

Pendahuluan: Maloklusi kelas II divisi 1 dilaporkan seringkali memicu terjadinya gangguan sendi temporomandibula. Posisi kondilus mengalami perubahan pada akhir perawatan ortodontik dengan pencabutan premolar pada maloklusi kelas II divisi 1. Tujuan penelitian menganalisis posisi kondilus pada akhir perawatan ortodontik supaya dapat memberikan pelayanan yang efektif dan komprehensif kepada pasien. Metode: Jenis penelitian deskriptif observasional dengan desain kohort dilakukan pada Klinik Spesialis RSKGM FKG UI dari Maret sampai Mei 2019. Subjek sebanyak 30 orang mengalami maloklusi kelas II divisi 1 yang memiliki gejala gangguan temporomandibular yang memenuhi kriteria inklusi. Metode sampling yang digunakan adalah sampling konsekutif. Foto transkranial dibandingkan dan diukur ruang sendinya bagian anterior, posterior dan superior dan dianalisis menggunakan uji Mc Nemar. Hasil: Sebelum dan sesudah perawatan ortodontik, posisi kondilus kanan dan kiri tidak mengalami perubahan yang signifikan (p>0,05). Sebelum dan sesudah perawatan ortodontik, AJS (Anterior Joint Space), PJS (Posterior Joint Space), SS (Superior Space) kanan dan kiri tidak mengalami perubahan yang signifikan (p>0,05). Gejala gangguan sendi temporomandibula pada akhir perawatan ortodontik adalah kliking dan krepitasi dilaporkan masih ada sedangkan gejala tidak nyaman dan keterbatasan membuka mulut dilaporkan sudah hilang. Simpulan: Tidak terdapat perbedaan posisi kondilus kanan dan kiri, sebelum dan sesudah perawatan ortodontik dengan pencabutan premolar pada maloklusi kelas II divisi 1. Keluhan gangguan sendi temporomandibular tidak ditemukan lagi pada akhir perawatan ortodontik.Kata kunci: Posisi kondilus, perawatan ortodontik, maloklusi kelas II divisi 1, pencabutan premolar. ABSTRACTIntroduction: Class II division 1 malocclusion is reported to trigger temporomandibular joint disorders often. The position of the condyles changed at the end of orthodontic treatment with premolar removal in class II division 1 malocclusion. This study aimed to analyse the position of the condyles at the end of orthodontic treatment to provide effective and comprehensive services to patients. Methods: This type of descriptive observational study with a cohort design was conducted at the Specialist Clinic of University of Indonesia Dental Hospital from March to May 2019. Thirty subjects experienced class II division 1 malocclusion who had temporomandibular disorders that met the inclusion criteria. The sampling method used was consecutive sampling. Transcranial radiographs were compared, and anterior, posterior and superior joint spaces were measured and analysed using the McNemar test. Results: Before and after orthodontic treatment, the position of the right and left condyles did not change significantly (p>0.05). Before and after orthodontic treatment, AJS (Anterior Joint Space), PJS (Posterior Joint Space), SS (Superior Space) right and left did not change significantly (p>0.05). Symptoms of temporomandibular joint disorder at the end of orthodontic treatment were clicking, and crepitus was reported to be present, while the symptoms of discomfort and limited opening of the mouth were reported to have disappeared. Conclusion: There is no difference in the position of the right and left condyles before and after orthodontic treatment with premolar extraction in class II division 1 malocclusion. Complaints of temporomandibular joint disorders were not found again at the end of orthodontic treatment. Keywords: Condyle position, orthodontic treatment, class II division 1 malocclusion, premolar extraction.

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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

BMC Oral Health ◽

10.1186/s12903-020-01314-0 ◽

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.

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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

10.21203/rs.3.rs-30799/v2 ◽

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.

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Comparison of radiographic changes in the alveolar crest after extraction of fully and partially erupted premolars during orthodontic treatment: A retrospective analytical study

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.34172/joddd.2021.046 ◽

2021 ◽

Vol 15 (4) ◽

pp. 279-284

Author(s):

Sanam Darban Hosseini ◽

Mojgan Kachoei ◽

Masoumeh Faramarzi ◽

Mahdiyeh Esmaeilzadeh

Keyword(s):

Orthodontic Treatment ◽

Premolar Extraction ◽

Alveolar Crest ◽

Extraction Site ◽

End Of Treatment ◽

Study Results ◽

Significant Difference ◽

Before And After ◽

Distal Aspect ◽

Radiographic Changes

Background. The alveolar process plays an essential role in providing dental support and gradually disappears with tooth loss. Space deficiency can cause one premolar to remain semi-erupted adjacent to a fully-erupted premolar. During orthodontic treatment, each of these premolars can be extracted. This retrospective study aimed to compare radiographic changes of the alveolar crest due to orthodontic movements of fully-erupted and semi-erupted premolars into the extraction sites before and after treatment. Methods. The patients were divided into the fully-erupted premolar extraction (first) group and the semi-erupted premolar extraction (second) group. The distance between the cementoenamel junction (CEJ) and the alveolar crest, from the distal aspect of the canine to the mesial aspect of the first molar, was measured on panoramic radiographs of 78 patients (39 from each group) before and after treatment with a digital caliper. Changes in the alveolar crest were compared between the two groups. Finally, the height differences of the alveolar crest in mesial and distal aspects of the remaining premolars in both groups were calculated at the end of treatment. Descriptive statistical analyses and paired and independent t tests were used in the study. Results. The distance from the CEJ to the alveolar crest at mesial and distal aspects in the first group and the distal aspect of the extraction site in the second group increased significantly. However, changes at the mesial aspect were not significant in the second group. Comparing the alveolar crest height between the two groups and between the mesial and distal aspects of the remaining premolar tooth indicated no significant differences. Conclusion. No significant difference was observed between the extraction of a fully-erupted or semi-erupted premolar to obtain greater alveolar height.

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Perbedaan Analisis Sefalometri Skeletal Sebelum dan Sesudah Perawatan Alat Myofunctional pada Pasien Maloklusi Dentoskeletal Kelas II Divisi I dalam Masa Pertumbuhan dengan Metode Steiner

Majalah Sainstekes ◽

10.33476/ms.v4i2.906 ◽

2019 ◽

Vol 4 (2) ◽

Author(s):

Nugroho Ahmad Riyadi

Keyword(s):

Orthodontic Treatment ◽

Class Ii ◽

T Test ◽

Analytic Study ◽

Statistic Analysis ◽

Twin Block ◽

Normal Occlusion ◽

Division 1 ◽

Before And After ◽

Class Ii Division 1

The aim of orthodontics treatment is normalization of teeth position in three planes, using various orthodontics appliance to reach the chepalometric standar and normal occlusion. Orthodontic treatment for dentoskeletal class II division 1 malocclusion in growing patients using myofunctional appliance may correct anteroposterior planes of mandibula. This study was a descriptive retrospective analytic study to look at the success of Orthodontic treatment for dentoskeletal class II division 1 in growing patients with myofunctional appliance using chepalometrics analysis Steiner value. The sample used in this study is chepalogram radiographic from patient with dentoskeletal class II division 1 malocclusion in growing patients before and after using myofunctional appliance in PPDGS orthodontics Clinic of Padjadjaran University. Statistic analysis were performed with pair t-test and Wilcoxon. Based on this study, it is concluded that orthodontic treatment with myofunctional appliance such as activator and twin block in growing patient with dentoskeletal class II division 1 malocclusion shows significant changes and compatibility with the normal criteria.

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