Dadarwal Ashish, Paliwal Jyoti, Sharma Vineet, Meena Kamal K, Raigar Ramjee L, Gaziwala Mohini
Prosthodontics, Rajasthan University of Health Sciences (RUHS) College of Dental Sciences, Jaipur, IND.
Cureus. 2022 Mar 31;14(3):e23673. doi: 10.7759/cureus.23673. eCollection 2022 Mar.
Aim The present in vivo study was undertaken for microstrain analysis of the selective pressure impression technique using strain gauges in mandibular complete denture impression. Methodology Ten completely edentulous patients undergoing complete denture treatment were selected for the study. For each patient, mandibular casts were made, and two custom trays were fabricated on the mandibular cast. These mandibular trays were divided into two groups: those with mandibular impressions made in the custom tray with the use of a spacer (MST) and those without a spacer (MWS). For each patient, a primary impression was made by using an impression compound. After that, the primary cast was obtained, and the custom tray was fabricated by using auto polymerizing resin. Then strain gauges were attached to the particular areas of the tray. The customized tray with zinc oxide eugenol impression material was seated in the patient's mouth for the final impression. The strain produced during impression making at different areas was recorded by a multi-channel (six) strain amplifier and data logger (8-channel digital strain indicator NIC, Jaipur, India). The data obtained were subjected to statistical analysis using an independent t-test (for quantitative data within two groups). The level of significance was set at p=0.05 (p<0.05-significant, p<0.01-highly significant, p<0.0001-very highly significant). Results The comparison of the percentage of microstrain produced at the relief area with and without spacer tray design showed a statistically significant (p=0.001) result with a greater number of percentages of microstrain among those without spacers (94.19) than with spacer (72.09) tray design. Conclusion The use of a tray with relief for selective pressure impression of an edentulous mandible resulted in a desirable pressure distribution at the alveolar crests and buccal shelves.
目的 本体内研究旨在使用应变片对下颌全口义齿印模中的选择性压力印模技术进行微应变分析。
方法 选取10名接受全口义齿治疗的无牙颌患者进行研究。为每位患者制作下颌模型，并在该下颌模型上制作两个定制托盘。这些下颌托盘分为两组：一组是在定制托盘中使用间隔物制作下颌印模（MST），另一组是不使用间隔物（MWS）。为每位患者使用印模膏制作初印模。之后，获取初模型，并用自凝树脂制作定制托盘。然后将应变片粘贴到托盘的特定区域。将装有氧化锌丁香酚印模材料的定制托盘放入患者口中制取终印模。通过多通道（六个）应变放大器和数据记录器（8通道数字应变指示器NIC，印度斋浦尔）记录印模制作过程中不同区域产生的应变。使用独立t检验（用于两组内的定量数据）对获得的数据进行统计分析。显著性水平设定为p = 0.05（p < 0.05 - 显著，p < 0.01 - 高度显著，p < 0.0001 - 非常高度显著）。
结果 有无间隔物托盘设计在缓冲区域产生的微应变百分比比较显示，差异具有统计学意义（p = 0.001），无间隔物（94.19）的微应变百分比数量多于有间隔物（72.09）的托盘设计。
结论 使用带有缓冲的托盘对无牙颌下颌进行选择性压力印模，可在牙槽嵴和颊侧牙槽嵴顶获得理想的压力分布。
