The influence of 3x3 bonded retainer on anterior crowding relapse in mandibular incisor extraction cases

Abstract

Objective: To evaluate the 3x3 bonded retainer influence on the mandibular anterior crowding in cases treated with mandibular incisor extraction Methods: The sample comprised pretreatment, posttreatment and follow-up orthodontic records of 16 subjects (10 females and 6 males) with Class I malocclusion treated with extraction of a single mandibular incisor. The mean ages (± SD) at pretreatment, posttreatment and follow-up evaluation were 23.45 ± 9.14 years, 25.50 ± 8.95 years and 30.11 ± 8.59 years, respectively. The mean (± SD) treatment time and posttreatment evaluation time were 2.05 ± 0.45 years and 4.60 ± 1.85 years , respectively. Little irregularity index and interdental widths were evaluated using dental casts. The sample was divided into two subgroups, according to the presence of the 3x3 bonded retainer at follow-up. Results: The subgroup without 3x3 bonded retainer presented a greater relapse at the follow-up, when compared to 3x3 bonded retainer subgroup. Conclusion: There was a significant relapse in cases treated with mandibular incisor extraction at follow-up. The subgroup without 3x3 bonded retainer showed a significant relapse at the follow-up when compared to the retainer group.

Mandibular Crowding: Diagnosis and Management—A Scoping Review

“…The extraction of all the first premolars with subsequent orthodontic treatment is the most used method to relieve dental crowding [ 52 ]. The importance and timing of extraction as a component of orthodontic therapy for late incisor crowding have been well investigated [ 35 ]. No difference in late incisor crowding is shown by the data, regardless of whether serial extraction or early or late premolar extraction is performed prior to orthodontic treatment.…”

“…No difference in late incisor crowding is shown by the data, regardless of whether serial extraction or early or late premolar extraction is performed prior to orthodontic treatment. Additionally, selecting a non-extraction orthodontic procedure has been linked to post-retention crowding [ 35 ]. Maurits Persson et al investigated changes in the mandibular incisor area from early adolescence to late adulthood in patients with a class I crowding malocclusion treated in the mixed dentition by the extraction of all first premolars without subsequent orthodontic treatment [ 35 ].…”

“…Additionally, selecting a non-extraction orthodontic procedure has been linked to post-retention crowding [ 35 ]. Maurits Persson et al investigated changes in the mandibular incisor area from early adolescence to late adulthood in patients with a class I crowding malocclusion treated in the mixed dentition by the extraction of all first premolars without subsequent orthodontic treatment [ 35 ]. The extraction group included 24 subjects who had all their first premolars extracted at a mean age of about 11.5 years to treat a class I space deficiency malocclusion.…”

“…The extraction group included 24 subjects who had all their first premolars extracted at a mean age of about 11.5 years to treat a class I space deficiency malocclusion. The control group included 21 subjects who had normal occlusions at the age of 13 years [ 35 ]. The extraction group showed no improvements in lower incisor irregularity, and a significant increase in lower tooth space insufficiency into adulthood.…”

“…The extraction group showed no improvements in lower incisor irregularity, and a significant increase in lower tooth space insufficiency into adulthood. Lower incisor irregularity and space shortage developed significantly in the control group throughout late adulthood [ 35 ]. Premolar extraction is the sole treatment option for severe crowding in a class I occlusion, allowing for spontaneous adjustments and more stable incisor alignment in late adulthood, according to the authors [ 35 ] ( Table 2 ).…”