Abstract
ABSTRACTTo improve orthodontic treatment efficiency, orthodontists must know which variables could interfere with orthodontic treatment time.Objective:To identify variables and their effect size on orthodontic treatment time of Class III malocclusion.Material and Methods:Forty-five Class III malocclusion cases were selected from 2008 patients’ records. Clinical charts, cephalometric radiographs, and pre and posttreatment dental casts were evaluated. Age, sex, PAR index at T1 and T2, overjet, missing teeth, extractions, number of treatment phases, missed appointments, appliance breakages, and cephalometric variables SNA, SNB, ANB, Wits, SnGoGn, CoA, CoGn, IMPA, 1.PP were investigated by multiple linear regression analysis and stepwise method at p<0.05. The sample was also divided into two groups: Group 0-2 (patients who had missed two clinical appointments or less) and Group >2 (patients who missed more than 2 appointments), to detect the influence of this data on treatment time and the quality of the treatment (PAR T2).Results:Average treatment time was 30.27 months. Multiple regression analysis showed that missed appointment (R2=0.4345) and appliance breakages (R2=0.0596) are the only variables able to significantly predict treatment duration. Treatment time for patients who missed more than 2 appointments was nearly one year longer. However, no significant influence on PAR T2 was observed for those patients.Conclusion:Orthodontic treatment duration in Class III patients is mainly influenced by factors related to patient compliance. Patients who missed more appointments did not show worse orthodontic finishing, but longer treatment. No occlusal, cephalometric, or demographic variable obtained before treatment was able to give some significant prediction about treatment time in Class III patients.
Highlights
Orthodontic treatment duration has always been a major concern to both patients and professionals
Exclusion criteria comprised patients who had more than one missing tooth per hemiarch, who missed over 16 appointments, and those who were surgically treated
Mean treatment time for Class III subjects was of 30.27 months
Summary
Orthodontic treatment duration has always been a major concern to both patients and professionals. In an attempt to predict treatment costs, patients want to know how long their orthodontic treatment will take[6]. Braces can cause discomfort and inconveniences related to daily routine changes. A more precise prediction of the duration of a treatment can earn patients’ trust, representing a valuable tool for a successful treatment. “Truth and accurate time estimation” are two of the most frequent recommendations, followed by “reduction in treatment fees”[19]. Orthodontic treatment has biological costs and long treatments have been associated with root resorption[17,22]. A better understanding of the factors influencing treatment time can SURYLGHVXSHULRUFRVWEHQH¿WRXWFRPHVDVLWDOORZV orthodontists to manage treatment, achieving, great results in less time
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