Clinical Evaluation of Impressions Made Using One Step & Two Step Polyvinylsiloxane Impression Techniques and Resulting Fixed Prosthesis-A Randomised Controlled Trial
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 62
- 试验地点
- 1
- 主要终点
- Incidence of defects in impression recorded to fabricate dental prosthesis as assessed by impression quality assessment scale
研究概览
简要总结
This randomized controlled trial is to clinically assess and compare impression quality of polyvinylsiloxane impression material using one step (experimental) and two step (control) impression techniques and its effect on marginal fit of prosthesis and proximal contact of prosthesis.
详细描述
Study participants will be randomly allocated to either of the two groups (experimental or control) through software-generated random numbers.
Indicated tooth will be prepared to receive a fixed prosthesis under local anesthesia as per standard guidelines.
Polyvinylsiloxane (PVS) impressions will be recorded in stock tray after moisture control, according to the assigned group.
In experimental group, light body and putty PVS will be mixed simultaneously and placed in stock tray to record impressions in single stage.
In control group, a putty PVS impression will be recorded first in stock tray and allowed to set. After setting of putty PVS, light-bodied PVS material will be applied to recorded impression surface and reseated in mouth to record final impression in second stage.
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
- Double (Participant, Outcomes Assessor)
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
- •Indication of fixed-fixed partial denture or crown
- •Good oral hygiene
- •Sound abutment tooth (vital/non-vital)
排除标准
- •Failure to provide written consent to participation in study
- •Long span bridges (Greater than 3 units)
- •Patients with bleeding disorders
- •Cases indicated for resin-bonded prosthesis
研究组 & 干预措施
One step polyvinylsiloxane impression technique
All impressions in this group will be recorded in a single stage, mixing light-bodied PVS material and putty PVS material simultaneously and recording of impression of prepared tooth
干预措施: Polyvinylsiloxane impression with different techniques (Device)
Two step polyvinylsiloxane impression technique
All impressions in this group will be made in two stages, recording putty PVS impression first and then reloading it with light-bodied PVS material to record final impression.
干预措施: Polyvinylsiloxane impression with different techniques (Device)
结局指标
主要结局
Incidence of defects in impression recorded to fabricate dental prosthesis as assessed by impression quality assessment scale
时间窗: 10 minutes
Outcome assessment scale: 1. Perfect impression, no voids or defects; 2. Acceptable impression, minimal defects in non critical region; 3. Unacceptable impression, defects involving critical region.
次要结局
- Incidence of prosthesis proximal contact inaccuracy as assessed by prosthesis contact assessment scale(14 days)
- Incidence of prosthesis margin defects as assessed by Marginal adaptation assessment scale(14 days)
研究者
Humera Nasim
Lecturer (Prosthodontics department), Principal investigator
Dow University of Health Sciences