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首页> 外文期刊>The Journal of Prosthetic Dentistry >The effect of a resin-based sealer on crown retention for three types of cement.
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The effect of a resin-based sealer on crown retention for three types of cement.

机译：树脂基密封剂对三种水泥的牙冠保持力的影响。

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STATEMENT OF PROBLEM: In an effort to control postoperative sensitivity, dentin sealers are being applied following crown preparation with little knowledge of how crown retention might be affected. A previous study demonstrated no adverse effect when using a glutaraldehyde-based sealer, and existing studies have shown conflicting results for resin-based products. PURPOSE: This study determined if a resin sealer applied to prepared dentin affected retention of cemented castings when using 3 common types of luting agents. MATERIAL AND METHODS: Extracted human molars (n=55) were prepared with a flat occlusal, 20-degree taper, and 4-mm axial length. The axial surface area of each preparation was determined and specimens were distributed equally among groups (n=11). A 2-step, single-bottle adhesive system (One Step) was used to seal dentin following tooth preparation. Sealer was not used on the control specimens except for the modified-resin cement (Resinomer) specimens that required use of adhesive with cementation. Using ceramometal high noble alloy (Olympia), a casting was produced for each specimen and cemented with a seating force of 20 Kg using either zinc phosphate (Fleck's), glass ionomer (Ketac-Cem) or modified-resin cement (Resinomer) with the single-bottle adhesive. Castings were thermal cycled at 5 degrees C and 55 degrees C for 2500 cycles; then removed along the path of insertion using a universal testing machine at 0.5 mm/min. A single-factor ANOVA was used with alpha=.05. The nature of failure was also recorded and the data analyzed with a chi-square test. RESULTS: Mean dislodgment stresses for unsealed and sealed conditions were 3.7 +/- 1.0 and 2.2 +/- 0.8 MPa for zinc phosphate; 2.7 +/- 1.2 and 4.2 +/- 0.9 MPa for glass ionomer, respectively (P<.001). Retentive stress of castings cemented with modified-resin cement was 6.4 +/- 1.7 MPa. With resin sealer in combination with zinc phosphate, cement resided totally on castings in 82% of the situations and was on both surfaces without sealer. Thetooth failed before casting dislodgment in 9 of 11 specimens cemented with modified-resin cement. CONCLUSIONS: Resin sealer decreased casting retentive stress by 42% when used with zinc phosphate. However, sealer use resulted in 55% increased retention when used with glass ionomer. The modified-resin cement produced the highest mean dislodgment stress, nearly always exceeding the strength of the tooth.
机译：问题陈述：为了控制术后敏感性，在准备牙冠后就使用了牙本质封闭剂，但对如何影响牙冠固位的了解很少。先前的研究表明，使用戊二醛基密封剂时不会产生不利影响，现有研究表明，基于树脂的产品存在矛盾的结果。目的：本研究确定了在使用三种常见类型的浸润剂时，将树脂密封剂应用于制备的牙本质是否会影响水泥铸件的固位。材料与方法：提取的人类臼齿（n = 55）的牙合平坦，锥度为20度，轴向长度为4毫米。确定每种制剂的轴向表面积，并将样品均匀地分布在各组中（n = 11）。准备好牙齿后，使用两步单瓶粘合系统（一步）密封牙本质。除了需要使用胶结剂的改性树脂水泥（Resinomer）试样以外，在对照试样上未使用密封剂。使用陶瓷金属高贵合金（奥林匹亚（Olympia）），为每个试样生产铸件，并使用磷酸锌（Fleck's），玻璃离聚物（Ketac-Cem）或改性树脂水泥（Resinomer）在20 Kg的承座力下进行固结。单瓶胶。将铸件在5摄氏度和55摄氏度热循环2500个循环;然后使用通用测试机以0.5 mm / min的速度沿插入路径移除。使用α= .05的单因素方差分析。还记录了故障的性质，并通过卡方检验分析了数据。结果：未密封和密封条件下的平均位移应力对于磷酸锌为3.7 +/- 1.0和2.2 +/- 0.8 MPa。玻璃离聚物的压力分别为2.7 +/- 1.2 MPa和4.2 +/- 0.9 MPa（P <.001）。改性树脂水泥固结的铸件的保持应力为6.4 +/- 1.7 MPa。将树脂密封剂与磷酸锌结合使用时，在82％的情况下，水泥完全滞留在铸件上，并且两面都没有密封剂。在用改性树脂胶粘剂粘结的11个试样中有9个铸模脱落之前，该牙齿失效。结论：与磷酸锌一起使用时，树脂密封剂可将铸件保持应力降低42％。但是，与玻璃离聚物一起使用时，使用密封剂会使保留率提高55％。改性树脂水泥产生最高的平均位移应力，几乎总是超过牙齿的强度。

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