el-Sheikh H A, Abdel-Hakim A M
Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
J Prosthet Dent. 1998 Aug;80(2):216-9. doi: 10.1016/s0022-3913(98)70114-3.
Corrected impression procedures provide the best possible support to be gained from an edentulous ridge for a removable partial denture, but they are time-consuming and technique-sensitive.
An experimental mandibular distal extension removable partial denture was used to measure the vertical movement of denture bases during biting.
Five patients participated for whom vertical movement of denture bases was measured by comparing the thickness of plaster interocclusal records made with the denture at rest and under biting pressure. Denture bases were processed on master casts formed from final impressions made in full arch custom trays. Secondly, bases were readapted using sectional relining impressions with the same regular body polysulfide impression material.
Statistical analysis of the vertical movement of denture bases during biting at 4 points on the right and left denture bases showed a significant decrease in vertical movement with sectional impression. The reduction was less than a 0.1 mm, a result that questions the routine use of sectional impression for every distal-extension mandibular removable partial denture.
Supportive form of distal-extension edentulous ridges can be recorded successfully by full arch impressions in custom trays.
校正印模程序可为可摘局部义齿从无牙颌获得尽可能好的支持，但它们耗时且对技术敏感。
使用实验性下颌远中游离端可摘局部义齿测量咬合过程中义齿基托的垂直运动。
五名患者参与研究，通过比较义齿静止时和咬合压力下制作的石膏咬合记录的厚度来测量义齿基托的垂直运动。义齿基托在由全牙弓定制托盘制作的终印模形成的主模型上进行加工。其次，使用相同的常规体聚硫橡胶印模材料通过分段重衬印模对基托进行重新适配。
对义齿基托左右两侧4个点在咬合过程中的垂直运动进行统计分析，结果显示分段印模使垂直运动显著减少。减少量小于0.1毫米，这一结果对每例下颌远中游离端可摘局部义齿常规使用分段印模提出了质疑。
定制托盘中的全牙弓印模可成功记录远中游离无牙颌嵴的支持形态。
