Dalkiz Mehmet, Arslan Demet, Tuncdemir Ali Riza, Bilgin M Selim, Aykul Halil
Department of Prosthetic Dentistry, Faculty of Dentistry, Mustafa Kemal University, Antakya, TURKIYE.
Eur J Dent. 2012 Jan;6(1):70-8.
The aim of this study was to determine the effect of different palatal vault shapes on the dimensional stability of a glass fiber reinforced heat polymerized acrylic resin denture base material.
Three edentulous maxilla with shallow, deep and medium shaped palatal vaults were selected and elastomeric impressions were obtained. A maxillary cast with four reference points (A, B, C, and D) was prepared to serve as control. Point (A) was marked in the anterior midline of the edentulous ridge in the incisive papillary region, points (B) and (C) were marked in the right and left posterior midlines of the edentulous ridge in the second molar regions, and point (D) was marked in the posterior palatal midline near the fovea palatina media (Figure 2). To determine linear dimensional changes, distances between four reference points (A-B, A-C, A-D and B-C) were initially measured with a metal gauge accurate within 0.1 mm under a binocular stereo light microscope and data (mm) were recorded.
No significant difference of interfacial distance was found in sagittal and frontal sections measured 24 h after polymerization and after 30 days of water storage in any of experimental groups (P>.05). Significant difference of linear dimension were found in all experimental groups (P<.01) between measurements made 24 h after polymerization of specimens and 30 days after water storage.
Palatal vault shape and fiber impregnation into the acrylic resin bases did not affect the magnitude of interfacial gaps between the bases and the stone cast surfaces.
本研究的目的是确定不同腭穹窿形状对玻璃纤维增强热聚合丙烯酸树脂义齿基托材料尺寸稳定性的影响。
选择三个具有浅、深和中等形状腭穹窿的无牙上颌骨，并获取弹性印模。制备一个带有四个参考点（A、B、C和D）的上颌模型作为对照。点（A）标记在切牙乳头区域无牙嵴的前中线，点（B）和（C）标记在第二磨牙区域无牙嵴的左右后中线，点（D）标记在腭中缝后部靠近腭中凹处（图2）。为了确定线性尺寸变化，在双目立体显微镜下用精度在0.1mm以内的金属量具初步测量四个参考点之间的距离（A - B、A - C、A - D和B - C），并记录数据（mm）。
在任何实验组中，聚合后24小时和储水30天后测量的矢状面和额状面界面距离均无显著差异（P>0.05）。在标本聚合后24小时和储水30天后的测量之间，所有实验组的线性尺寸均存在显著差异（P<0.01）。
腭穹窿形状和纤维浸入丙烯酸树脂基托中并不影响基托与石膏模型表面之间界面间隙的大小。
