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首页> 外文期刊>The Journal of Prosthetic Dentistry >Distortion of disposable plastic stock trays when used with putty vinyl polysiloxane impression materials.
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Distortion of disposable plastic stock trays when used with putty vinyl polysiloxane impression materials.

机译：当与腻子乙烯基聚硅氧烷印模材料一起使用时，一次性塑料原料托盘会变形。

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STATEMENT OF PROBLEM: Impressions are made using high-viscosity putty vinyl polysiloxane impression materials in conjunction with disposable plastic stock trays. The impression materials have been shown to be dimensionally stable. However, it remains unclear if the disposable plastic stock trays are rigid enough to resist deformation thus yielding potentially unreliable results. PURPOSE: This study evaluated the rigidity and ability to resist deformation of 6 commercially available disposable plastic stock trays and 1 metal stock tray when used in conjunction with a high-viscosity vinyl polysiloxane impression material. MATERIAL AND METHODS: Ten impressions were made with 1 putty vinyl polysiloxane material (Reprosil Putty) using each of the 6 tested disposable plastic stock trays, Sani-Trays (perforated), Sani-Trays (nonperforated), COE Disposable Spacer Tray (perforated), COE Disposable Spacer Tray (nonperforated), Bosworth Tray-Aways (perforated), Track-it Trays (perforated), and 1 metal stock tray (nonperforated), Cadco Dental Products, as a control on a mandibular plastic model. The dimensions of the tray in cross section at the mandibular right first molar area were measured before, during, and after the impression procedures with an electronic digital caliper. The cross-arch dimensions of the tray were measured at similar intervals. One examiner made all measurements and each measurement was repeatable within +/-0.01 mm. A split plot repeated measures analysis of variance (ANOVA) was performed and 2-sided P -values were calculated (alpha=.05). RESULTS: The results indicated that the disposable plastic trays tested were not sufficiently rigid to resist deformation when used with very high-viscosity putty material. Metal stock trays showed significantly less change in cross-arch dimension than plastic trays (F(1.68)=11.25, P =.001). Metal stock trays also showed significantly less change in cross-sectional arch dimension than plastic trays (F(1.68)=15.15, P<.001). CONCLUSION: When disposable plastic stock trays were tested in conjunction with very high-viscosity impression materials there was distortion of the tray both across the arch and in cross section.
机译：问题陈述：印象是使用高粘度腻子乙烯基聚硅氧烷印象材料与一次性塑料储料托盘一起制成的。印模材料已显示尺寸稳定。然而，尚不清楚一次性塑料托盘是否足够坚固以抵抗变形，从而产生潜在的不可靠结果。目的：本研究评估了与高粘度乙烯基聚硅氧烷印模材料一起使用时，6个市售的一次性塑料托盘和1个金属托盘的刚度和抗变形能力。材料和方法：使用6个经过测试的一次性塑料原料托盘，Sani-托盘（带孔），Sani-托盘（无孔），COE一次性垫片托盘（带孔）中的每一个，用1种油灰乙烯基聚硅氧烷材料（Reprosil Putty）制成十个印模，COE一次性垫片托盘（无孔），Bosworth托盘-离开（有孔），Track-it托盘（有孔）和1个金属库存托盘（无孔），Cadco牙科产品，作为下颌塑料模型的对照。在压印程序之前，期间和之后，使用电子数显卡尺测量下颌右第一磨牙区域的横截面托盘尺寸。托盘的跨拱尺寸以相似的间隔进行测量。一位检查员进行了所有测量，并且每次测量在+/- 0.01 mm内可重复。进行分割图重复测量方差分析（ANOVA），并计算2面P值（alpha = .05）。结果：结果表明，与非常高粘度的腻子材料一起使用时，所测试的一次性塑料托盘的刚性不足以抵抗变形。与塑料托盘相比，金属托盘显示的拱形尺寸变化明显更少（F（1.68）= 11.25，P = .001）。与塑料托盘相比，金属托盘的横截面拱形尺寸变化也明显更少（F（1.68）= 15.15，P <.001）。结论：将一次性塑料原料托盘与非常高粘度的印模材料一起进行测试时，托盘在整个拱形和横截面上均会变形。

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