This study aims to assess the dental changes, periodontal health and the pulp vitality in mini-screw supported en-masse retraction associated with traditional or flapless corticotomy techniques. 40 adult patients exhibiting class II division 1 malocclusion requiring upper first premolar extractions followed by en-masse retraction will participate in the study. They will be randomly and equally distributed into two groups: traditional corticotomy (20 patients) versus flapless corticotomy (20 patients). The corticotomy procedure will be performed pre-retraction. The dental changes will be assessed using dental casts. The impressions will be taken after finishing the leveling and alignment phase and before starting the en-masse retraction (T0), 1 month (T1), 2 months (T2), 3 months (T3), 4 months (T4), and 5 months (T5) following the onset of en-masse retraction. The final impression will be considered at the end of the en-masse retraction (when the canines reach Class Ι relationship).
Age range
18 Years – 30 Years
Sex
ALL
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The rate of en-masse retraction of upper anterior teeth.
Timeframe: The calculation of the rate of retraction will be done once the retraction procedures finish. It is expected to happen within 5 months
Change in the anteroposterior movement of the molar at 5 months
Timeframe: T0:1 day before the beginning of the retraction phase. T1: after 1 month of the beginning of retraction phase . T2: after 2 months. T3: after 3 months. T4: after 4 months. T5: immediately after the end of retraction phase (expected to be after 5 months)
Change in the inter-canine width at 5 months
Timeframe: T0:1 day before the beginning of the retraction phase. T1: after 1 month of the beginning of retraction phase . T2: after 2 months. T3: after 3 months. T4: after 4 months. T5: immediately after the end of retraction phase (expected to be after 5 months)
Change in the inter-molar width at 5 months
Timeframe: T0:1 day before the beginning of the retraction phase. T1: after 1 month of the beginning of retraction phase . T2: after 2 months. T3: after 3 months. T4: after 4 months. T5: immediately after the end of retraction phase (expected to be after 5 months)