Evaluation of long-term sagittal lip changes using Burstone line: Pilot Study

Objective
 Lip position has become one of the most important soft tissue analyses as it influences occlusion, tooth stability and facial aesthetic. Hence, objective this study was to compare short-term long-term sagittal lip positions/changes using Burstone line (B-line).
 
 Methods
 The sample consisted 18 Caucasoid females only (14 extractions, 4 non-extractions) who were successfully treated with edgewise appliances. All patients evaluated before treatment (T1),at end active (T2), at a follow-up observation (T3). mean age commencement 13.2 years range 10.5-19 years.
 linear distance between tip lips B-line measured.
 Results
 T1-T2 time intervals showed upper underwent change 1.272 mm relative (-32.8%) which statistically significant. lower 1.549 (-22.2%), but these changes not significant.
 protrusion continued reduce during long term follow up period. slight (-9.2%), whereas demonstrated greater (-53.8%).
 Conclusion
 Using B-line, positions more retrusive on records for both extraction non-extraction cases, their values very different from normal untreated cases. Although differences significant, post T1-T2, while significant T1-T2.