Sinjari Bruna, D'Addazio Gianmaria, Xhajanka Edit, Caputi Sergio, Varvara Giuseppe, Traini Tonino
Department of Medical Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini 31, 66100 Chieti (CH), Italy.
Department of Dental Medicine, Medical University of Tirana, Rruga e Dibrës, Tirana 1001, Albania.
Materials (Basel). 2020 Mar 14;13(6):1321. doi: 10.3390/ma13061321.
Adhesive restorations have been shown to guarantee excellent performance and longevity, although this comes with some disadvantages. Among these, the vulnerability of dentine to different agents has been widely evaluated. The aim of this study was to evaluate the possible penetration of impression materials into freshly cut dentine. Dentine from 27 teeth was impressed with polyether (Impregum Penta L) (nine teeth) and with polyvinyl siloxane (Aquasil Ultra LV) (nine teeth). The surface of nine teeth after the impressions were used as the control. Specifically, the extroflections caused by the imprinting of the dentinal tubules on the impression material, the so-called impression tags, were measured. Furthermore, the presence of the material inside the tubules was examined. Scanning electron microscopy analysis showed material tags for all of the experimental groups. The mean lengths (±SD) were 22.6 (±11.0) µm for polyether, 21.8 (±12.8) µm for polyvinyl siloxane and 11.3 (±7.0) µm for the tooth control, with mean diameters (±SD) of 2.8 (±0.5), 2.4 (±0.7) and 3.1 (±0.7) µm, respectively. Fractal analysis showed fractal dimensions of 1.78 (±0.03), 1.77 (±0.03) and 1.71 (±0.03), respectively. These data demonstrated that the impression materials can remain inside the dentinal tubules, which can adversely affect the adhesive procedures.
尽管存在一些缺点，但粘结修复体已被证明能保证出色的性能和使用寿命。其中，牙本质对不同介质的敏感性已得到广泛评估。本研究的目的是评估印模材料是否可能渗入新切割的牙本质中。用聚醚（Impregum Penta L）（9颗牙）和聚乙烯基硅氧烷（Aquasil Ultra LV）（9颗牙）对27颗牙齿的牙本质进行印模。将9颗牙齿印模后的表面用作对照。具体而言，测量了牙本质小管印刻在印模材料上所引起的外折，即所谓的印模标记。此外，还检查了小管内材料的存在情况。扫描电子显微镜分析显示所有实验组均有材料标记。聚醚的平均长度（±标准差）为22.6（±11.0）µm，聚乙烯基硅氧烷为21.8（±12.8）µm，牙齿对照为11.3（±7.0）µm，平均直径（±标准差）分别为2.8（±0.5）、2.4（±0.7）和3.1（±0.7）µm。分形分析显示分形维数分别为1.78（±0.03）、1.77（±0.03）和1.71（±0.03）。这些数据表明，印模材料可残留在牙本质小管内，这可能会对粘结程序产生不利影响。
