Evaluation of the Achieved Occlusal Relationships Using the PAR Index Between the In-house Constructed Clear Aligners and Fixed Appliances in Patients With Extraction-based Treatment Plans: A Randomized Control Clinical Trial
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 36
- 试验地点
- 1
- 主要终点
- Change in PAR index
研究概览
简要总结
Patients who have severe crowding that requires four premolars extraction will be treated in this study. The efficacy and effectiveness of in-house clear aligners therapy compared with vestibular fixed appliances in the treatment of severe crowding malocclusion cases requiring the extraction of first premolars will be evaluated using Little's irregularity index (LII), Peer assessment rating index (PAR), and treatment duration.
There are two groups:
First group (Experimental): the patients in this group will be treated using clear aligners.
Second group (Control): the patients in this group will be treated using fixed appliances.
详细描述
For years, orthodontists and dentists have used removable appliances for orthodontic treatment. With the CAD/CAM technology, clear aligners treat a broader range of cases with greater precision. They consist of a series of plastic aligners that are intended to replace conventional wire and bracket technology for many orthodontic cases. Each custom-manufactured aligner exerts gentle, continuous forces to move teeth incrementally from their original state to a final, treated state. Each aligner is worn for about two weeks, then replaced by the next in the series until the final position is achieved.
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
- 18 Years 至 25 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Class I skeletal and dental malocclusion
- •severe crowding (more than 6 mm of tooth size-arch length discrepancy)
- •Good oral hygiene and periodontal health.
- •No congenitally missing or extracted teeth (except for the third molars).
- •No history of previous trauma to the maxillofacial region or surgical interventions.
排除标准
- •Subject with psychological abnormalities.
- •Subject with systemic diseases.
- •Previous orthodontic treatment.
- •Subject has known allergy to latex and plastic
结局指标
主要结局
Change in PAR index
时间窗: T0: one day before the commencement of treatment. T1: one day following the end of treatment
The PAR index will be used to provide objective assessment of treatment success. Each set of dental models prepared before and after treatment for each case will be occluded in maximum intercuspation and a calibrated PAR ruler is used to assign a value to each of the PAR index components: contact displacement in the upper and lower labial segment (UAS), overjet (OJ), overbite (OB), medline deviation (MID) and right and left buccazzzl occlusion (RBO, LBO). The score of each component is summed up to a total PAR score. A reduction in the PAR score of at least 30% classifies the case as 'improved'. A reduction of 22 points or more in the weighted PAR score classifies the case as 'greatly improved'. Improvements smaller than 30% are declared as 'worse or no different'
Changes in Little's irregularity index
时间窗: T0: one day before the commencement of treatment. T1: one day following the end of treatment
The Little's index measures the linear displacements in the horizontal plane between the contact points of the anterior teeth from the mesial surface of one canine to the contralateral one. The LII score is the sum of these linear measurements, and a higher score value indicates more severe irregularities of the anterior teeth
次要结局
- Treatment time(T1: one day following the end of treatment)