Correlation between mandibular third molar and mandibular incisor crowding: A retrospective CBCT-based study

Husain, Seerab; Rengalakshmi, Sri

doi:10.34172/joddd.2021.040

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…17 Late mandibular anterior crowding is encountered less frequently in the absence of third molars. 7 In contrast, other authors could not find any evidence supporting this idea. [18][19][20][21] Furthermore, in the cases of anterior crowding, extracting the third molars did not alleviate the problem, and third molar extraction is not necessary to prevent crowding.…”

Section: Discussionmentioning

confidence: 85%

Alt Üçüncü Molar Di̇şleri̇n Alt İki̇nci̇ Molar Ve Alt Kani̇n Di̇şleri̇ni̇n Eksen Eği̇mleri̇ne Olan Etki̇si̇

Işık

Soğancı

Güler

et al. 2023

ADO Klinik Bilimler Dergisi

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AIM: This study aims to investigate effect of mandibular third molars on angulation of mandibular second molars and canines. MATERIAL AND METHOD: A total of 16 patients (10 female, 6 male) were included. All patients had two panoramic radiographs. All mandibular third molars were available in the first panoramic radiograph. The second panoramic radiograph was taken approximately 124.81 ± 21.63 weeks after one-sided mandibular third molar extraction. The angulations of the second mandibular molars and mandibular canines were measured on the first and second panoramic radiographs. These angulations were evaluated on the extraction side and non-extraction side. Paired t-test was used to compare the angulation changes. RESULTS: On the extraction side, differences were observed in the angulation of the second molars and canines showed uprighting movement however, these differences were not significant. On the non-extraction side, both the second molars and canines showed uprighting movement. However, the difference was statistically significant only in the second molars. CONCLUSION: We conclude that mandibular teeth are progressively uprighting and not extracting the mandibular third molars increases the uprighting effect on the second molars.

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Section: Discussionmentioning

confidence: 85%

Alt Üçüncü Molar Di̇şleri̇n Alt İki̇nci̇ Molar Ve Alt Kani̇n Di̇şleri̇ni̇n Eksen Eği̇mleri̇ne Olan Etki̇si̇

Işık

Soğancı

Güler

et al. 2023

ADO Klinik Bilimler Dergisi

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“…However, Vego 15 reported that erupting lower 3rd molars can exert force on the adjacent teeth, and the results of a recent cone beam computed tomography study suggested that although crowding is a complex phenomenon with a multifactorial etiology, 3rd molars have an effect on late incisor crowding. 12 On the other hand, in a recent meta-analysis and systematic review by Pithon et al 5 no statistically significant difference was found in the degree of incisor crowding after orthodontic treatment between patients with 3rd molars and those with agenesis of these teeth. Therefore, it was concluded that prophylactic extraction of the 3rd molars is not indicated for orthodontic patients.…”

Section: Introductionmentioning

confidence: 94%

“…While some studies have reported that the presence or absence of mandibular 3rd molars does not affect the relapse of anterior crowding in orthodontically treated patients [3][4][5][6][7][8] , other studies have reported that these teeth may contribute to crowding of the incisors. [9][10][11][12] Zachrisson 13 stated that the etiology of lower incisor crowding after orthodontic treatment was multifactorial. Angle 14 argued that normal occlusion together with ideal interdigitation after orthodontic treatment would prevent the recurrence of incisor crowding.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

KURT DEMİRSOY,

YILANCI,

ABAY

et al. 2023

neudentj

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Purpose: This study aimed to evaluate the effect of the absence or presence of third molars on the relapse of mandibular incisor crowding after orthodontic treatment and to determine the indication for prophylactic third molar extraction in orthodontic patients based on Ganss ratios. Material and Method: The study was conducted with the dental models, panoramic and lateral cephalometric radiographs, and intraoral and extraoral photographs of 42 patients (26 females, mean age 16.56±4.96 years; 16 males, mean age 17.52±4.39 years). Data were collected at three time points: before (T1), at the end of (T2), and at least 2 years after the end of orthodontic treatment (T3). The patients were divided into two groups: those with impacted or erupted third molars (Group 1, n=22) and those with agenesis or extracted third molars (Group 2, n=20). Panoramic radiographs were used to determine the presence or absence of third molars at the three time points and to calculate Ganss ratio (GR) (1). Dental models were scanned with the 3 Shape TRIOS oral scanner (3 Shape Co. Copenhagen, Denmark) and mandibular anterior crowding was assessed using Little’s Irregularity Index (LII) (2). Mann-Whitney U test was used to compare mandibular LII values between the groups. GR values of mandibular impacted third molars at T1-T3 were evaluated with repeated-measures ANOVA. Pearson correlation analysis was used to determine the correlation between LII and GR in Group 1. Statistical significance was set at P<0.05. Results: There was no statistically significant difference between the groups in terms of the relapse of mandibular anterior crowding and the presence or absence of mandibular third molars (P=0.940). In Group 1, GR increased significantly at T3 due to an increase in retromolar distance (P<0.05). There was no correlation between LII and GR in Group 1. Conclusion: The presence or absence of mandibular third molars did not affect the relapse of mandibular anterior crowding in orthodontic patients. Prophylactic third molar extraction after orthodontic treatment does not seem necessary.

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“…4 In another study conducted by Husain and Rengalakshmi, it is concluded that third molars may be one of the reasons for mandibular incisor crowding, if not the only one. 5 However, Tüfekçi et al reported that Swedish and US orthodontists do not believe that impacted mandibular third molars can cause lower anterior crowding even with their anterior force. 6 Similarly, Cotrin et al reported that anterior teeth relapse is unrelated to mandibular third molars.…”

Section: Introductionmentioning

confidence: 99%

The Role of Dental Arch Dimensions and Impacted Third Molars on Mandibular Anterior Segment Crowding

Selmani,

Bukleta,

Duci

2024

Eur J Dent

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Objectives This study aimed to investigate the potential impact of arch dimensions and unerupted third molars on mandibular anterior segment crowding. Materials and Methods This study included a total of 240 subjects with an average age of 18 years seeking orthodontic treatment. Panoramic radiographs, alginate impressions, and study models were taken for measurements. This study utilized the Ganss ratio to calculate the ratio of retromolar space to the width of the crown of the third molar, along with other measurements such as intercanine and intermolar widths, arch perimeter, and arch length to assess dental arch dimensions. Results We found that the Ganss ratio and angle B values on both the right and left sides were significantly different between the noncrowding and crowding groups, suggesting a potential role for third molars in mandibular anterior segment crowding. Additionally, there was an increase in angle A on both sides in the crowding group, indicating a more acute angle between the anterior teeth. This study also observed a reduction in the retromolar space on the third molars in the crowding group, further supporting the potential role of third molars in mandibular anterior segment crowding. Conclusion The findings of our study provide substantial evidence to suggest that third molars may contribute to mandibular anterior segment crowding. These findings highlight the importance of carefully evaluating dental arch dimensions and the presence of third molars when assessing and treating mandibular anterior segment crowding.

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Correlation between mandibular third molar and mandibular incisor crowding: A retrospective CBCT-based study

Cited by 10 publications

References 18 publications

Alt Üçüncü Molar Di̇şleri̇n Alt İki̇nci̇ Molar Ve Alt Kani̇n Di̇şleri̇ni̇n Eksen Eği̇mleri̇ne Olan Etki̇si̇

Alt Üçüncü Molar Di̇şleri̇n Alt İki̇nci̇ Molar Ve Alt Kani̇n Di̇şleri̇ni̇n Eksen Eği̇mleri̇ne Olan Etki̇si̇

Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

The Role of Dental Arch Dimensions and Impacted Third Molars on Mandibular Anterior Segment Crowding

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