Effect of extraction of premolars on eruption of mandibular third molars

Influence of First Premolar Extraction on Mandibular Third Molar Angulation

“…Extraction of premolars to allow mesial drifting of the buccal segment has been the subject of many investigations. 6,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The intent of the present study was to determine whether extraction of the first premolars results in more mesial movement of the mandibular buccal segment and causes favorable rotational changes in the mandibular third molar tilt. This study evaluated the changes in the mandibular third molar angulations relative to a reference plane and to the second molar long axis.…”

Wisdom Tooth Eruption Secondary to Localized Lower Molar Mesialization in Patients with Aplastic Lower Second Premolars

“…Allerdings steigt die Wahrscheinlichkeit für den Erhalt von drtten Molaren mit einem günstigeren Platzangebot, wie es z. B. nach Extraktionstherapien bestehen soll [6,7,24,27]. Für den isolierten Lücken-schluss bei Nichtanlagen unterer zweiter Prämolaren wurde nach Mesialisierungen unterer erster und zweiter Molaren ein Platzgewinn von ca.…”

“…Je function of the amount of available space as should exist after extraction therapy, for example [6,7,24,27]. After localized orthodontic space closure by mesialization of lower first and second molars in situations of aplastic lower second premolars, a space gain of approximately five millimeters has been reported [31,32].…”

Radiographic Assessment for Predicting the Mandibular Third Molar Eruption after Orthodontic Treatment in First Premolar Extraction Group and Non-Extraction Group: A-retrospective Study

“…Based on this, it can be concluded that there was a high possibility of impaction of third molar in orthodontic cases treated by nonextraction approach as compared to first premolar extraction approach. Dierkes [11] and Faubion [21] had found that only 15% of mandibular third molars erupted in good position after nonextraction therapy. Richardson and Dent [18] reported that in the orthodontic patients treated by non-extraction approach, 56% of the mandibular third molars were either impacted or had problems that needed surgical removal.…”

“…Thus, the findings of this study suggests that the impaction of mandibular third molars were more likely in patients treated by non-extraction approach in accordance with the previous studies. [11,18,21,22] Changes in the Angulation of Mandibular third Molar Richardson and Dent [18] conducted a study in which he found that 34% of the orthodontic cases treated with non-extraction approach presented with impaction, and the impaction decreased to 28% in cases treated with premolar extractions. He concluded that most of the impacted third molars have been straightening out to some extent and that the degrees of their angles have been augmented.…”