Short-and Long-term Cephalometric Analysis of Maxillary Hypoplasia Secondary to Cleft Lip and Palate in Adolescents Treated with Upper Arch Expansion and Protraction
Short-and Long-term Cephalometric Analysis of Maxillary Hypoplasia Secondary to Cleft Lip and Palate in Adolescents Treated with Upper Arch Expansion and Protraction
Objective To retrospectively analyze the short and long-term lateral cephalometric changes of maxillary hypoplasia secondary to CLP repair by upper arch expansion and protraction.And to understand the stability of the treatment.Methods 23 patients with maxillary hypoplasia after CLP surgery were enrolled in this study.Cephalometric analysis was performed on the lateral radiographs before treatment(T0),immediately after treatment(T1)and during long follow-up(T2).Results At the end of protraction(T1),the ∠SNA increased by 1.21°,the ∠SNB decreased by 1.94°,and the ∠ANB increased by 3.15°.The position and size of maxilla became larger.The mandibular plane Angle increased,and the ramus of the mandible became larger.The anterior and posterior alveolar height of the upper and lower jaws became larger.The ∠U1-SN were improved,and the soft tissue shows increased protrusion of the upper lip.It was found that the maxillary and the related indicators were stable at T2,while the mandibular body showed significant increase after T1,while the ramus and mandibular anterior and posterior alveolar height showed continuous increase from T0 to T2.The mandibular plane Angle decreased,but it was still larger than T0 stage.The ∠ANB still have a significant increase 2.05° compared with T0 stage despite the decrease.The UL-EP decreases.Conclusion Skeletal Class Ⅲ malocclusion relationship of cleft lip and palate can be improved by promoting maxillary development and mandibular clockwise rotation.Long-term observation shows that the maxillary protraction effect is stable,but the mandible continues to grow and reverse rotation leads to the relapse to some extent.
关键词
唇腭裂/前牵引/头影测量/稳定性/上颌发育不足/近期疗效/远期疗效
Key words
cleft lip and palate/facemask protraction/cephalometric/stability/maxillary hypoplasia/short-term efficacy/long-term efficacy
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