Effect of Repressing of Three Pressable Ceramics With Different Weight Percentage on Patient Satisfaction, Microstructure and Biaxial Flexural Strength
试验速览
- 阶段
- 不适用
- 状态
- 进行中（未招募）
- 发起方
- 入组人数
- 15
- 试验地点
- 2
- 主要终点
- Good oral hygiene and patient satisfaction
研究概览
简要总结
Introduction: Green dentistry, is high-technology approach that reduces the environmental impact of dental practices, improper disposal of dental materials wastes results in environmental hazards.
Aim of the study: This studied will be performed o evaluate the effect of repressing of three different types of pressable ceramics, Ips Emax press, Lisi press and Celtra press with different weight percentages on patient satisfaction, mechanical properties, microstructural features and composition of these pressable ceramics.
Materials & Methods:
Seventy five ( N=75) pressable ceramic discs will be constructed ,The samples will be divided to three groups (n=25 each) according to types and composition of pressed and repressed ceramics .Group 1: IPS Emax press .Group 2: Gc Lisipress Group 3: Celtrapress . Each group willbe divided into 5 sub-groups (n=5) according to the weight percentage of newly pressed and repressed ceramics. Subgroup A: 100% new ceramics. Subgroup B: 75% new and 25 % repressed ceramic .Subgroup C: 50% new and 50% repressed ceramics. Subgroup D:25%new and 75% repressed ceramics. Subgroup E: 100% repressed ceramics. Biaxial flexural strength will be measured using universal testing machine. X-ray diffraction will be performed to identify the crystalline phases, and a scanning electron microscope will be used to describe microstructural features. Energy dispersive X-ray analysis will be used to evaluate change in composition Also surface hardness will be evaluated. Patient satisfaction, plaque, cervical caries and marginal discoloration will be evaluated in a follow- up of one year (in vivo part).
详细描述
Methods:
This study will be divided into two parts: I. In vitro and in vivo studies:
In vitro study
- Sample size calculation.
- Sample grouping.
- Fabrication of the ceramic discs.
- Testing procedures.
- Statistical analysis
Sample size estimation and statistical power:
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
- 18 Years 至 60 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Patients requesting single crowns for mandibular posterior teeth.
- •Mandibular posterior teeth that will be prepared to receive single crowns should have adequate crown root ratio, periodontal support, exhibited minimal mobility and adequate tooth preparation length to ensure proper resistance and retention form .
- •Cooperative patients.
排除标准
- •Patients with severe periodontitis, gingival inflammation, parafunction and poor oral hygiene or high caries activity will be excluded from the present study.
结局指标
主要结局
Good oral hygiene and patient satisfaction
时间窗: 1 year
he presence of plaque will be evaluated using the Loe and Silness plaque index. Score 0= no plaque the tooth surface is clean. Score 1= The tooth surface appears clean ,but dental plaque can be removed from the gingival third with a sharp explorer Score 2= Plaque is visible along the gingival margin to naked eye (moderate accumulation) Score 3=Large amount of plaque in sulcus - Clinical examination will be performed using a mirror and sharp explorer, radiograph and photograph. . Patient satisfaction will be evaluated using a questionnaire The patient satisfaction: Patient satisfaction of each subgroup will be assessed by using Visual Analogue Scale (VAS) which is documented chart in the form of satisfied or unsatisfied. A questionnaire will be used to evaluate restorations at baseline (1 week after cementaton), 3 and 6 months
excellent marginal integrity
时间窗: 1 year
Marginal discoloration evaluated by Visual inspection with mirror at 45 degrees angel Score Alpha (A) No discoloration Bravo (B)Superficial staining (removable, usually localized). Charlie (C)Deep staining (not removable, generalized).
Quality and strength of the restoration and
时间窗: 1 year
Modified (USPHS) Ryge criteria system was used to evaluate the quality of all crowns. Category Evaluated by Score Criteria Fracture evaluated by Visual inspection with dental explorer Score Alpha (A) No evidence of fracture. Bravo (B) Evidence of fracture Category Evaluated by Score Criteria Fracture evaluated by Visual inspection with dental explorer Score Alpha (A) No evidence of fracture. Bravo (B) Evidence of fracture
Excellent patient satisfaction, good mechanical properties and microstructure of single crown restorations .
时间窗: 1 year
Clinical evaluation will be performed according to: \- Modified United States Health Service (USPHS) Ryge Criteria, at base line (1 week), 3, 6 and12 months after cementation.
次要结局
未报告次要终点
研究者
Leena Ashry
Principl investigator leena Asahry(Lashry
Faculty of Dental Medicine for Girls