Murata Hiroshi, Hong Guang, Li Ying Ai, Hamada Taizo
Graduate School of Biomedical Sciences, Department of Prosthetic Dentistry, Hiroshima University, Hiroshima, Japan.
J Prosthet Dent. 2005 Mar;93(3):274-81. doi: 10.1016/j.prosdent.2004.12.011.
Although the primary use of tissue conditioners is to treat abused mucosa, these materials are also frequently used as functional impression materials. No information was identified on the effect that these materials may have on the surface of the resultant dental stone cast.
This study evaluated the compatibility of 3 tissue conditioners with dental stones and changes in surface conditions over time.
Three tissue conditioners (COE-comfort, Soft-conditioner, and Visco-gel) and 4 dental stones (Capstone DF, New Plastone, Die Stone, and New Fujirock) were evaluated. One impression material (Examixfine) was used as a control. Tissue conditioner disks were made by pouring freshly mixed material into a polypropylene container, pressing the material down with a glass plate, and then removing the plate 2 hours later. The disks were then stored in distilled water for 0 or 24 hours, or 3, 7, or 14 days. Subsequently, each dental stone was mixed and poured over the top of each disk and allowed to remain for 60 minutes. Twenty-five disk-shaped specimens, 18 x 2 mm, for each tissue conditioner/stone cast combination were prepared. Mean surface roughness (Ra) values of the dental stone casts made from the tissue conditioners were determined using a profilometer. Five measurements for each specimen were made. Data were analyzed with 1- and 3-way analysis of variance and the Student-Newman-Keuls test (alpha=.05). Detail reproduction was also determined using a ruled test block, as specified in ISO specification 4823.
Contribution ratios determined by 3-way analysis of variance indicated that the surface roughness values were significantly more influenced by the time of immersion in water ( P <.0005, contribution ratio rho=37%), than the type of tissue conditioner ( P <.0005, rho=19%) or dental stone used ( P <.0005, rho=1%). The best surface quality was obtained with a New Fujirock cast (0.81 +/- 0.06 microm), followed by New Plastone (0.83 +/- 0.12 microm) and Die Stone (0.85 +/- 0.05 microm) casts, in combination with Visco-gel without immersion in water, and those were nearly equivalent in surface roughness to a Die stone cast from Examixfine. The surface roughness values of all specimens, especially the COE-comfort/stone cast combinations, significantly increased with tissue conditioner immersion time ( P <.0005). Visco-gel tended to produce a better surface quality during the test periods than the other materials. All stone casts made from the tissue conditioners not immersed in water reproduced 20-microm or 50-microm lines, while the detail diminished over time with immersion.
The type of tissue conditioner, and especially immersion time, had a significant effect on the surface quality of dental stone casts. The type of dental stone used is less important.
尽管组织调理剂的主要用途是治疗受损黏膜，但这些材料也经常用作功能性印模材料。目前尚未发现关于这些材料可能对所得石膏模型表面产生何种影响的相关信息。
本研究评估了3种组织调理剂与石膏之间的兼容性以及随时间推移表面状况的变化。
对3种组织调理剂（COE-舒适型、软质调理剂和粘性凝胶）和4种石膏（Capstone DF、新型塑料石膏、超硬石膏和新型富士石）进行了评估。使用一种印模材料（Examixfine）作为对照。通过将新混合的材料倒入聚丙烯容器中，用玻璃板压平，2小时后取出玻璃板来制作组织调理剂圆盘。然后将圆盘在蒸馏水中储存0或24小时，或3、7或14天。随后，将每种石膏混合并浇铸在每个圆盘顶部，保持60分钟。针对每种组织调理剂/石膏模型组合制备25个直径18×2mm的圆盘形标本。使用轮廓仪测定由组织调理剂制成的石膏模型的平均表面粗糙度（Ra）值。对每个标本进行5次测量。数据采用单因素和三因素方差分析以及Student-Newman-Keuls检验（α = 0.05）进行分析。还按照ISO规范4823的规定，使用带刻度的测试块测定细节再现性。
三因素方差分析确定的贡献率表明，与组织调理剂类型（P < 0.0005，贡献率ρ = 19%）或所用石膏类型（P < 0.0005，ρ = 1%）相比，表面粗糙度值受在水中浸泡时间的影响显著更大（P < 0.0005，贡献率ρ = 37%）。使用新型富士石模型（0.81 ± 0.06微米）获得的表面质量最佳，其次是新型塑料石膏（0.83 ± 0.12微米）和超硬石膏（0.85 ± 0.05微米）模型，它们与未浸泡在水中的粘性凝胶组合使用，表面粗糙度与Examixfine制成的超硬石膏模型几乎相当。所有标本的表面粗糙度值，尤其是COE-舒适型/石膏模型组合，随着组织调理剂浸泡时间显著增加（P < 0.0005）。在测试期间，粘性凝胶往往比其他材料产生更好的表面质量。所有由未浸泡在水中的组织调理剂制成的石膏模型都能再现20微米或50微米的线条，但随着浸泡时间延长，细节逐渐减少。
组织调理剂的类型，尤其是浸泡时间，对石膏模型的表面质量有显著影响。所用石膏的类型则不太重要。
