Abstract:
Objective
To evaluate the effects of modified fixed Twin-block appliance treatment on the profiles of Class Ⅱ patients.
Methods
Eighteen Class Ⅱ patients with mandiblular deficiency in mixed or early permanent dentition were treated with modified fixed Twin-block in the first functional phase. The effects were evaluated with Holdaway soft tissues analysis.
Results
The results showed that the thickness of soft-tissue chin increased （P=0.045）and soft-tissue facial angle increased （P=0.008）. The lower lip-H line distance decreased （P=0.045）， H angle decreased （P=0.042）， lower lip sulcus depth decreased （P=0.027） and skeletal profile convexity decreased （P=0.044）. The height of nose （P=0.051）， upper lip sulcus depth（P=0.172）， subnasale-H line（P=0.393）， the base thickness of upper lip（P=0.256）， the change of upper lip thickness （P=0.120） is statistically insignificant.
Conclusions
Modified fixed Twinblock appliance treatment was effective on improvement of facial balance in Class Ⅱpatients with mandiblular deficiency in the mixed or early permanent dentition.
Key words:
Modified fixed Twin-block appliance,
Class Ⅱmalocclusion,
Functional treatment,
Holdaway soft tissue analysis
Yu LU, Zeng-quan WANG. Soft tissue analysis on Class Ⅱ patients treated with modified tixed Twin-block appliance[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2010, 4(02): 174-179.