PMC3955309_01
Before trea tment
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F1
In the intraoral examination, there was Class I molar relationship with about 70  rotation of right maxillary central incisor [Figure 1a]. After 4 weeks, the tooth was derotated very well. [Figure 1b] There was no need to coverthe incisal edge and the wound in labial mucosa completely healed. After 4 times replacement of the spring, rotation was almost corrected [Figure 1c]. At the end of treatment, supracrestal fiberotomy was performed and a segmented arch wire was placed to prevent relapse [Figure 1d]. At 1 year follow-up, there were not any pathologic findings in the radiographic view like root resorption [Figure 1e].
2 month after starting treatment
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F2
Whip spring was built with a segment of 0.4 mm stainless steel orthodontic wire (0.0016 inches) (Dentaurum, Germany), in which the distal end of the wire was bended to form vertical loop facing upward and immediately a vertical loop facing downward [Figures 2a-c].
PMC3955309_02
4 month after starting treatment
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F3
The rotated tooth was not fully erupted [Figure 3a and b]. Radiographic examination confirmed severe rotation of left maxillary central incisor and early stage of root development [Figure 3c]. After 5 times replacement of the spring, rotation was almost corrected [Figure 3d]. This appliance was made of acrylic base plate, labial bow on anterior segment and Adams clasp on the maxillary permanent first molars [Figure 3e]. There were no pathologic findings in the radiographic view [Figure 3f].
PMC3955309_03
Retention phase
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F4
Radiographic examination showed early stage of root development [Figure 4a-c] and there was enough space in the upper arch to derotate it. After 1 month, the tooth was derotated well [Figure 4d]. At the end of treatment, the removable retainer appliance was constructed and used by patient for 6 months to maintain the corrected tooth position [Figure 4e]. Follow-up panoramic radiograph revealed healthy root development [Figure 4f].