Abstract
ABSTRACTObjective: 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.
Highlights
Retention and stability are always a concern for orthodontists
There was a significant relapse in cases treated with mandibular incisor extraction at follow-up
Data were collected according to the following inclusion criteria: Class I malocclusion patients with straight profile, mild to moderate mandibular anterior crowding, maxillary teeth generally well aligned, with the dental midline coincident with the facial midline, complete permanent dentition up to first permanent molars at the beginning of treatment, no dental agenesis, no tooth shape or number abnormalities, and no previous orthodontic treatment performed with mandibular incisor extraction
Summary
Retention and stability are always a concern for orthodontists. Maintaining a stable orthodontic treatment over the years posttreatment is a challenge. Several long-term retention studies evaluating the stability of different treatment modalities have reported that some relapse can be expected irrespective of initial malocclusion or type of treatment.[1,2,3] Most of the researches is centered on the mandibular anterior crowding relapse.[4,5,6] Long-term follow-up studies show that long-term response to mandibular anterior alignment is unpredictable; parameters such as initial crowding, age, sex, Angle classification, maxillary and mandibular incisor proclination, horizontal and vertical growth amounts have not been useful in establishing a prognosis.[7,8] It has been shown that two thirds of the patients presented unsatisfactory mandibular anterior alignment after retention, and crowding continues to increase during the 10 to 20 years posttreatment.[7,9]
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