The Effect of Two Different Types of Forces on Possible Root Resorption in Relation to Dentin Phosphoprotein Levels

"A buccally directed continuous tipping force of 150 g is applied to the maxillary first premolar by a cantilever spring made of 0.017 x 0.025 beta-titanium-molybdenum alloy inserted in the tube of the upper first molar, bypassing the second premolar and attaching to the upper first premolar. The buccal tipping force will be checked and reactivated to the original level on the 28th day of the 8 week study period."

"A buccally directed tipping force of 150 g is applied to the maxillary first premolar by a cantilever spring made of 0.017 x 0.025 beta-titanium-molybdenum alloy inserted in the tube of the upper first molar and attaching to the upper first premolar. The buccal tipping force will be removed every 21 days for a 7-day rest period, where a passive wire of the same gauge and material of the cantilever spring (0.017 x 0.025 beta-titanium-molybdenum alloy) will be placed instead to maintain the position of the upper first premolar during the rest period."