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ePaper created 2018-03-13, 09:28:55 | version 1.38.0
| technique Fig. 4a Fig. 4b Fig. 4c Fig. 4d Figs. 4a & b: Initial. Figs. 4c & d: Final. and supplemented with the use of the HFV device for five minutes per day. Prior to the procedure, the patient was instructed on recognising appropriate aligner tracking. As shown in Figures 4c and d, treatment with 79 align- ers (43 initial, 22 first refinement, 14 second refinement) was completed in 13 months and three weeks (compared to the anticipated treatment time of 19.5 months with- out acceleration). The use of MOP in combination with the HFV device resulted in exceptional aligner tracking throughout treatment, patient comfort with the acceler- ated aligner exchange of every three to six days, and a treatment time truncated by almost six months. Discussion and conclusion In spite of a growing body of both laboratory stud- ies and clinical reports investigating the effects of pulse vibration devices—both low- and high-frequency— 36 ortho 1 2018