Cephalometric Evaluation of a Clear Mandibular Advancement Appliance Based on the Twin-block Design
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 20
- 主要终点
- Maxilla to cranial base
研究概览
简要总结
This study evaluates the cephalometric effects of a clear mandibular advancement appliance for the treatment of skeletal class II growing patients suffering from mandibular deficiency.
详细描述
A Clear mandibular advancement appliance is constructed comprised of a clear dental splint of 1.5 mm thickness adapted on the patient's teeth. This is followed by the construction of acrylic bite ramps bonded over the splints. The bite ramps are constructed as such when the patient bites into occlusion, he/she has to advance the mandible to bring the two parts of the appliance together. Lateral cephalometric radiographs were obtained pre and post-treatment to evaluate the effects on the patient's maxilla, mandible and dentition.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 8 Years 至 12 Years（Child）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Gender: Female subjects.
- •Chronological age: All recruited subjects were between the ages of 8-12 years.
- •Anteroposterior skeletal relationship: Subjects with skeletal Class II malocclusion with normal maxilla and retrognathic mandible were selected. This was confirmed using lateral cephalometric radiographic analysis with the following parameters: decreased effective mandibular length (Co-Gn) according to McNamara composite , SNB<78, SNA=82+
- •Dental characteristics:
- •Angle Class II molar relationship ranging from edge to edge to full unit Class II.
- •Overjet ranging between 5-10 mm.
- •Absence of posterior crossbite and/or tendency for posterior crossbite.
- •Skeletal maturation stage: The growth stage for all subjects was selected to be before or at the prepubertal growth spurt. This was confirmed by cervical vertebral maturation analysis from the lateral cephalometric radiograph. The cervical vertebrae maturation stage required was Cervical Vertebrae Maturation stage 2-3 according to the cervical vertebrae maturation index by Baccetti et al. allowing sufficient time before the end of the growth spurt.
- •No previous history of orthodontic treatment.
- •Absence of systemic diseases affecting growth or craniofacial development. -
排除标准
- 未提供
研究组 & 干预措施
Treatment arm
Subjects receiving the clear mandibular advancement appliance
干预措施: Clear Mandibular Advancement Appliance (Device)
结局指标
主要结局
Maxilla to cranial base
时间窗: 12 months
Sella-Nasion-A point
Effective Mandibular Length
时间窗: 12 months
Condylion-Gnathion
Mandible to cranial base
时间窗: 12 months
Sella-Nasion-B point
Effective maxillary length
时间窗: 12 months
Condylion-A point
次要结局
- Chin position(12 months)
- Lower incisor AP position(12 months)
- Profile convexity(12 months)
- Lip protrusion(12 months)
- Lower incisor inclination(12 months)
- Upper incisor inclination(12 months)
- Upper incisor AP position(12 months)
研究者
Ahmed Mostafa Zaky
Lecturer of Orthodontics
Ain Shams University