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

Hartono, D. F.; Soegiharto, Benny Mulyono; Sumardi, Sariesendy

doi:10.1088/1742-6596/1073/2/022007

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…This is not a stable measurement either as the second molars can be tipped in the mesial/distal/lingual/buccal direction prior to the start of the treatment and then get corrected post orthodontic treatment. Hartono et al [ 22 ] conducted a study to assess the change in angulation of mesioangular impacted lower molars before and after premolar extractions. They concluded that the extraction of premolars in orthodontic treatment did not significantly affect the angulation of impacted third molars.…”

Section: Discussionmentioning

confidence: 99%

Third molar angulation changes in Class II div I malocclusion subjects treated with extraction of four premolars: A retrospective study

Shashidhar

Castelino

Kuttappa

et al. 2020

J Int Soc Prevent Communit Dent

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A BSTRACT Aim: The aim of this study was to assess the changes in maxillary and mandibular third molar inclinations in individuals with class II div 1 malocclusion, before and after orthodontic treatment with extraction of all four first premolars. Materials and Methods: This retrospective study consisted of the pretreatment and posttreatment records of 30 patients that were obtained from the archives of the department of orthodontics and dentofacial orthopedics in A B Shetty Memorial Institute of Dental Sciences. The maxillary third molar’s relation to the palatal plane and the mandibular third molar’s relation to the mandibular plane were measured. The paired t test was used to calculate pre- and posttreatment changes. A value of P < 0.05 was considered to be statistically significant. Results: The maxillary third molars showed a mean correction of 6.15° ( P < 0.001) and the mandibular third molars showed a mean correction of 5.10° ( P < 0.001). Conclusion: Maxillary third molars showed more uprighting when compared to the mandibular third molars and that both maxillary and mandibular third molars showed an improvement in their angulations to their respective planes after extraction of the first premolars. However, the results of the study cannot be analyzed to state if the third molars do become fully functional.

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Section: Discussionmentioning

confidence: 99%

Third molar angulation changes in Class II div I malocclusion subjects treated with extraction of four premolars: A retrospective study

Shashidhar

Castelino

Kuttappa

et al. 2020

J Int Soc Prevent Communit Dent

View full text Add to dashboard Cite

show abstract

“…A previous systematic review reported that the closer the extraction site is to the third molar, the more it influences its development and uprighting [21]. However, other authors also report similar trajectories for the third molars, irrespective of whether the first or second premolar was extracted [13,16,23,30], indicating that treatment mechanics might play a greater role [30].…”

mentioning

confidence: 99%

“…Moreover, the Frankfurt plane was used as the reference plane by two studies [14,39], which both examined panoramic x-rays and found no difference in the angulation of the lower third molar before and after the orthodontic treatment between an extraction and non-extraction group. The use of the angulation of the third with the second molar was used only by Hartono et al [16] who found no statistical difference before and after the orthodontic treatment in a group of patients with premolar extractions. Both the occlusal plane and the long axis of the second molar were used as references by others [2,27].…”

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confidence: 99%

Effect of orthodontic extraction of mandibular premolars on third molar angulation after treatment with fixed appliances

et al. 2023

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Purpose Orthodontic treatment involving premolar extractions might improve the angulation of lower third molars, which are the teeth most often impacted. This study analyzes the impact of first/second lower premolar extraction during orthodontic therapy on the angulation of mandibular third molars. Methods A total of 120 patients treated non-extraction (n = 40), with extraction of first (n = 40), or second lower premolars (n = 40) were included. The mesiodistal angulation of lower third molars relative to the adjacent tooth and their developmental stage were evaluated from posttreatment orthopantomograms. Between-group differences were statistically evaluated at a significance level of 0.05. Results The orthopantomograms of 120 patients (51% female) with a median age of 15.2 years at the time of debonding were evaluated after a mean treatment duration time of 2.9 years. No difference (P > 0.05) was seen between the average angulation of the lower third molars of the right (mean = 24.4°, standard deviation [SD] 13.6°) and the left side (mean = 23.6°, SD 14.1°). No differences in the angulation of the lower third molar were found between the non-extraction and extraction groups for the right (P = 0.44) or the left side (P = 0.22). Likewise, no differences were found when comparing the first and second premolars for the right (P = 0.26) or the left side (P = 0.10). Premolar extraction was associated with an advanced root development stage of the right third molar (odds ratio 7.1; 95% confidence interval 1.1–48.1; P = 0.04), with no differences between extraction of the first or second premolar (P = 0.10). Conclusion Orthodontic treatment involving premolars extractions might be associated with a small acceleration in root development, but not with the angulation, of lower third molars.

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

Cited by 2 publications

References 7 publications

Third molar angulation changes in Class II div I malocclusion subjects treated with extraction of four premolars: A retrospective study

Third molar angulation changes in Class II div I malocclusion subjects treated with extraction of four premolars: A retrospective study

Effect of orthodontic extraction of mandibular premolars on third molar angulation after treatment with fixed appliances

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