Age-related long-term posttreatment occlusal and arch changes

Area of Science:

• Orthodontics and Dentofacial Orthopedics
• Long-term dental stability
• Adolescent vs. Adult treatment outcomes

Background:

• Understanding long-term post-treatment changes is crucial for orthodontic success.
• Adolescent and adult patients may exhibit different patterns of dental stability.
• Previous studies have not comprehensively compared long-term retention between these age groups.

Purpose of the Study:

• To compare long-term postretention changes in occlusal variables between adolescent and adult orthodontic patients.
• To identify age-related differences in dental stability over approximately 16 years.
• To analyze the influence of initial malocclusion (Class I vs. Class II) on long-term outcomes.

Main Methods:

• Retrospective analysis of 96 patients (51 adolescents, 45 adults) with Class I or Class II malocclusions.
• Subjects were retained for 3 years and followed for approximately 16 years post-treatment.
• Occlusal variables including overjet, overbite, incisor irregularity, PAR score, and arch dimensions were measured.

Main Results:

• Significant increases in occlusal variables (overjet, overbite, incisor irregularity, PAR score) were observed over time in both groups.
• Adolescents showed significantly greater increases in mandibular incisor irregularity and PAR scores compared to adults.
• Class II malocclusions exhibited greater overjet increases, while Class I showed greater mandibular intermolar width decreases.

Conclusions:

• Adolescents experience more pronounced long-term orthodontic relapse than adults, evidenced by increased incisor irregularity and PAR scores.
• Initial malocclusion type influences long-term stability, with Class I patients demonstrating favorable changes in overjet and mandibular intermolar width.
• These findings highlight age-specific considerations for orthodontic treatment planning and retention strategies.