Clinical Performance and Convenience of Three Types of Crowns as Esthetic Alternatives to Stainless Steel Crowns for Primary Molars
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 80
- 试验地点
- 4
- 主要终点
- the gingival index
研究概览
简要总结
This study will be conducted to assess the clinical performance and convenience of three types of crowns as esthetic alternatives to stainless steel crown for primary molars:
- The prefabricated commercially available zirconia crowns (NuSmile®) (NZC).
- The locally manufactured zirconia crowns created via Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) system (CCZC).
- The locally manufactured hybrid ceramic crowns created via Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) system (CCHC).
详细描述
Eighty lower second primary molars will be divided into 4 groups:
- Group 1(n=20): receive 3M™ ESPE™ Stainless Steel crowns for Primary Molars.
- Group 2 (n=20): receive the prefabricated commercially available zirconia crowns (NuSmile®) (NZC).
- Group 3 (n=20): receive the locally manufactured zirconia crowns created via (CAD/CAM) system (CCZC).
- Group 4 (n=20): receive the locally manufactured hybrid ceramic crowns created via (CAD/CAM) system (CCHC).
Clinical and radiographic examination of the primary molar will be conducted to ensure compliance with the study criteria. Oral health instructions will be given to the child and parents then the application of local anesthesia.
- Stainless steel crowns:
Reduction of occlusal surface by about 1.5 mm using a flame shaped diamond bur to produce a uniform occlusal reduction. Proximal reduction using a long and tapered diamond bur to allow the probe to pass through the contact area. An appropriate size will be selected according to mesiodistal width of the prepared tooth and a trial fit will be carried out before cementation. The crown should remain no more than 1 mm subgingivally.(21) 2. Zirconia and hybrid ceramic crowns:
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 (Investigator)
入排标准
- 年龄范围
- 4 Years 至 8 Years（Child）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Children between 4-8 years old.
- •Definitely positive or positive behavior according to Frankl behavior rating scale.
- •The lower second primary molar with one or more indications for crown restoration.
排除标准
- •The child does not have occlusal problems or periodontal diseases
- •The child does not take medications that lead to symptoms of periodontal diseases.
结局指标
主要结局
the gingival index
时间窗: 12 months
0 = normal gingiva 1. = mild inflammation 2. = moderate inflammation 3. = severe inflammation
Crown retention
时间窗: 12 months
0 = present. 1 = absent.
Crown integrity
时间窗: 12 months
0 = intact. 1. = crack present. 2. = fracture present. 3. = crown lost.
Plaque Index
时间窗: 12 months
0 = no plaque 1= film at the gingival margin and adjacent tooth 2 = moderate accumulation of plaque 3 = abundance of plaque.
Color stability
时间窗: 12 months
0 = Unchanged. 1. = Minor deviation from original. 2. = Unacceptable discoloration.
次要结局
- wear of opposing natural teeth.(12 months)