Haralur Satheesh B, Saad Toman Majed, Ali Al-Shahrani Abdullah, Ali Al-Qarni Abdullah
Department of Prosthodontics, College Of Dentistry, King Khalid University, Abha, Saudi Arabia.
College Of Dentistry, King Khalid University, Abha, Saudi Arabia.
Int J Dent. 2016;2016:7414737. doi: 10.1155/2016/7414737. Epub 2016 Dec 14.
The accurate duplicate cast obtained from a single impression reduces the profession clinical time, patient inconvenience, and extra material cost. The stainless steel working cast model assembly consisting of two abutments and one pontic area was fabricated. Two sets of six each custom aluminum trays were fabricated, with five mm spacer and two mm spacer. The impression methods evaluated during the study were additional silicone putty reline (two steps), heavy-light body (one step), monophase (one step), and polyether (one step). Type IV gypsum casts were poured at the interval of one hour, 12 hours, 24 hours, and 48 hours. The resultant cast was measured with traveling microscope for the comparative dimensional accuracy. The data obtained were subjected to Analysis of Variance test at significance level <0.05. The die obtained from two-step putty reline impression techniques had the percentage of variation for the height -0.36 to -0.97%, while diameter was increased by 0.40-0.90%. The values for one-step heavy-light body impression dies, additional silicone monophase impressions, and polyether were -0.73 to -1.21%, -1.34%, and -1.46% for the height and 0.50-0.80%, 1.20%, and -1.30% for the width, respectively.
从单个印模获得的精确复制模型减少了专业临床时间、患者不便和额外材料成本。制作了由两个基牙和一个桥体区域组成的不锈钢工作模型组件。制作了两组定制铝托盘，每组六个，分别带有5毫米间隔物和2毫米间隔物。研究期间评估的印模方法有附加硅酮油灰重衬（两步法）、重质-轻质体（一步法）、单相（一步法）和聚醚（一步法）。在1小时、12小时、24小时和48小时的间隔时间浇注IV型石膏模型。用移动显微镜测量所得模型的尺寸精度以进行比较。对获得的数据进行显著性水平<0.05的方差分析测试。从两步法油灰重衬印模技术获得的模型，高度变化百分比为-0.36%至-0.97%，而直径增加了0.40%至0.90%。一步法重质-轻质体印模模型、附加硅酮单相印模和聚醚印模模型的高度值分别为-0.73%至-1.21%、-1.34%和-1.46%，宽度值分别为0.50%至0.80%、1.20%和-1.30%。
