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[Clinical analysis of muscle function intensifier in treatment of 40 patients with maxillary protrusion]
1Department of Dentistry, Fengcheng Hospital, Fengxian District. Shanghai 201411, China.
Purpose:
To investigate the clinical effects of combined muscle functions intensifier and straight wire appliance in the treatment of maxillary protrusion.
Methods:
Forty patients with maxillary protrusion were randomly divided into 2 groups (group A and group B). Straight wire appliance and muscle function intensifier were used in group A, while patients in group B received straight wire appliance only. X-ray projection was conducted to measure relative maxillary index (labial inclination of upper or lower incisor, SNB angle, ANB angle, FMA, maxillary plane angle, NA-PA, U1-FH, U1-PP, forward moving distance of U6) before and 6 months after treatment. The efficacy was analyzed and evaluated using SPSS 20.0 software package.
Results:
After correction, labial inclination of upper or lower incisor, SNB angle, ANB angle, FMA, maxillary plane angle, NA-PA, U1-FH, U1-PP changed significantly in both groups (P<0.05), but patients in group A achieved more incisor adduction and less forward moving distance of U6, with significant difference between the two groups (P<0.05).
Conclusions:
Most patients with maxillary protrusion have a bad habit of mouth breathing. Muscle function intensifier is used only at night and can relieve the patient's mouth breathing, speed up the movement of teeth, and reduce the loss of anchorage and ultimately, improve the correction efficiency and clinical effect of patients with maxillary protrusion.
