Parisay Iman, Khazaei Yegane
Dental Material Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Oral Hygiene, School of Hygiene, Torbat Heydarieh University of Medical Sciences, Torbat Heidariye, Iran.
Dent Res J (Isfahan). 2018 May-Jun;15(3):201-207.
Stainless steel crown (SSC) is the most reliable restoration for primary teeth with extensive caries. Retention is of great importance for a successful restoration and is provided by various factors such as luting cements. The aim of this study was to evaluate the retentive strength of SSC cemented with four different luting cements.
In this study, A total of 55 extracted primary first molars were selected. Following crown selection and cementation (one with no cement and four groups cemented with resin, glass ionomer, zinc phosphate, and polycarboxylate), all the specimens were incubated and thermocycled in 5°C-55°C. Retentive properties of SSCs were tested with a mechanical test machine. First dislodgement of each specimen and full crown removal were recorded. One-way ANOVA test followed by least significant difference test and Kruskal-Wallis test was used for retentive strength comparison at the level of significance of < 0.05.
The results of the study showed that the specimens cemented with zinc phosphate exhibited higher retentive strength as compared to glass ionomer and polycarboxylate ( < 0.001 and = 0.023, respectively).
Zinc phosphate cement showed the most promising results; thus, it can be preferably used for cementation of the teeth with no grossly broken down crowns.
不锈钢冠（SSC）是治疗广泛龋坏乳牙最可靠的修复体。固位对于成功修复至关重要，多种因素如粘结水门汀可提供固位力。本研究旨在评估用四种不同粘结水门汀粘结的SSC的固位强度。
本研究共选取55颗拔除的乳牙第一磨牙。在选择牙冠并进行粘结后（一组不使用粘结剂，四组分别用树脂、玻璃离子水门汀、磷酸锌水门汀和聚羧酸锌水门汀粘结），所有标本在5°C - 55°C下进行孵育和热循环处理。用机械试验机测试SSC的固位性能。记录每个标本的首次脱位和全冠去除情况。采用单因素方差分析，随后进行最小显著差检验和Kruskal - Wallis检验，以比较在显著性水平<0.05时的固位强度。
研究结果表明，与玻璃离子水门汀和聚羧酸锌水门汀相比，用磷酸锌水门汀粘结的标本表现出更高的固位强度（分别为<0.001和 = 0.023）。
磷酸锌水门汀显示出最有前景的结果；因此，它可优选用于粘结牙冠未严重损坏的牙齿。
