Skeletal class I patients Mild to moderate crowding of mandibular anterior teeth (Little’s irregularity index less than 6 mm and each contact not exceed 1.5 mm) 18-
Conditions
Interventions
Aligning teeth with NiTi curve of Spee archwire before leveling teeth with rectangular TMA archwire by gradually reduce the curve of Spee 1.5 mm each time,Leveling and aligning teeth with NiTi archwir
Experimental Device,Active Comparator Device
Experimental group,Treated control group
Sponsors
Graduate School, Prince of Songkla University
Department of Preventive Dentistry,
Faculty of Dentistry,
Prince of Songkla University
Eligibility
Sex/Gender
All
Age
18 Years to 30 Years
Inclusion criteria
Inclusion criteria: Subjects who are 18-30 years old Healthy, no underlying diseases or drug use which affects bone metabolism Skeletal class I (ANB = 3±2 degree) with normodivergent pattern (FMA = 23±4 degree) All mandibular teeth are presented except third molar Mild to moderate crowding of mandibular anterior teeth (Little’s irregularity index less than 6 mm and each contact not exceed 1.5 mm) Minimal or no crowding of mandibular posterior teeth (tooth size-arch length discrepancy less than 3 mm) Curve of Spee depth between 3-4 mm Normally inclined mandibular incisors (IMPA = 93±6 degree) Attach gingiva at mandibular anterior teeth not less than 1.5 mm Treatment plan will be non-extraction orthodontic treatment by expert opinion
Exclusion criteria
Exclusion criteria: Subjects who allergic to metal materials or dental material that use in this study Subjects who have periodontal disease (clinical attachment level > 4 mm) Probing depth at mandibular anterior teeth more than 4 mm Subjects who have bone dehiscence or fenestration in anterior mandibular areas Subjects who had previously treated orthodontic treatment or history of initiated orthodontic treatment Subjects with hypo- or hyper-active mentalis muscle (MLA deviates from 128.5±11degree)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Cephalometric measurement Pre-treatment (T0), After teeth aligning (T1) and after teeth leveling (T2) Lateral cephalometric tracing and measurement | — |
Secondary
| Measure | Time frame |
|---|---|
| Cone-beam computed tomography measurement Pre-treatment (T0) and after teeth leveling (T2) Cone-beam computed tomography measurement,Stress distribution Pre-treatment (T0) Stress distribution around periodontal ligament , tooth and alveolar bone | — |
Contacts
Public ContactPornpat Theerasopon
PhD student
Outcome results
None listed