Dentoskeletal Changes Concomitant With Different Three Levels of Force Application for Maxillary Protraction in Growing Orthodontic Patients With Class 3 Malocclusion
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 30
- 试验地点
- 1
- 主要终点
- Amount of maxillary advancement
研究概览
简要总结
The aim of this study is to evaluate dentoskeletal changes concomitant with different three levels of force application for maxillary protraction in growing patients with skeletal class 3 malocclusion.
详细描述
Nanda reported that numerous experimental studies on primates have shown orthopedic changes in response to extraoral forces; however, very few studies have made an attempt to analyze the different force variables and their relationship to facial sutures. In consideration of the variables, experimental and clinical studies were initiated in their laboratory in 1972. A study on protraction of midfacial bones on primates reported that the point of force application significantly influences the center of rotation of the maxilla in rhesus monkeys. Our unpublished data also show that centers of rotation are influenced by the magnitude of force. The study showed that the maxilla can be successfully protracted by means of carefully controlled forces.
Based on the aforementioned data, we can hypothesize that the point of force application for maxillary protraction in relation to the center of resistance of maxilla could be utilized in order to correct skeletal class 3 malocclusions with different vertical dimension discrepancies.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Single (Outcomes Assessor)
入排标准
- 年龄范围
- 7 Years 至 10 Years（Child）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •The patients will be included in the study if they have the following:
- •An age range from 7 to 10 years.
- •Patients diagnosed to have skeletal class 3 malocclusion due to retruded maxilla and/or combined maxillary retrusion with mild mandibular protrusion. (based on cephalometric analysis)
- •No serious systemic diseases and/or medical treatment that could interfere with orthodontic tooth movement such as analgesics, non-steroidal anti-inflammatory drugs, and hormone supplements or antibiotics.
- •Good oral hygiene and periodontal conditions.
- •No evidence of craniofacial anomalies, such as cleft lip and palate or previous history of trauma, bruxism or parafunctions.
- •No previous orthodontic or orthognathic treatment.
排除标准
- •The patients will be excluded from the study if they have the following:
- •Systemic diseases or medications that could interfere with orthodontic treatment.
- •Poor oral hygiene or periodontally compromised patients.
- •Craniofacial anomalies or previous history of trauma, bruxism or parafunctions.
- •Previous orthodontic treatment.
研究组 & 干预措施
classic occlusal level, low point of force application
the point of force application for maxillary protraction is at the level of the occlusal plane.
干预措施: Petit typeface mask (Device)
Nasal level, Medium point of force application
the point of force application for maxillary protraction is at 20 mm from the occlusal plane (Nasal floor).
干预措施: Petit typeface mask (Device)
Infrorbital level, High level
the point of force application for maxillary protraction is at the level of the infraorbital foramen
干预措施: Petit typeface mask (Device)
结局指标
主要结局
Amount of maxillary advancement
时间窗: 8 months
the increase in maxillary length (condalyon-A point) in mm using Cone Beam Computed Tomgraphy (CBCT)
次要结局
- degree of maxillary rotation(8 months)
研究者
khaled Mohammad Taha
lecturer of orthodontics
Al-Azhar University