da Silva Adriana Fernandes, Piva Evandro, Demarco Flávio Fernando, Correr Sobrinho Lourenço, Osinga Prudêncio Willy Rodo
Piracicaba Dental School, UNICAMP-São Paulo, Brazil.
Oper Dent. 2006 May-Jun;31(3):377-83. doi: 10.2341/05-49.
This study verified the relationship between the volume and microleakage of conventional and bonded amalgam restorations. Also, the microleakage influence of intermediate materials, substrates and the direction of sectioning was investigated. Fifty-six bovine incisors were selected. Standard Class V cavities were prepared in buccal and lingual surfaces. For each tooth, two cavity sizes were prepared, corresponding to two cavity volumes: one larger (A) and the other smaller (B). The cervical wall was located in cementum/dentin and the incisal wall in enamel. The teeth were distributed in four groups (n=28) according to the intermediate material employed (glass-ionomer cement, resin cement, adhesive system and copal varnish-control). The materials were applied following manufacturers' directions. After restoration, the teeth were submitted to thermal cycling. They were then immersed in a dye solution and sectioned in two directions inciso-cervical (IC) and mesio-distal (MD) sections to evaluate the microleakage. Data were subjected to non-parametric statistical analysis (Wilcoxon's paired test and Kruskal-Wallis test). No significant difference was found between the two cavity sizes. Leakage in enamel was statistically lower than in the cementum/dentin interface (p < 0.05). In some situations, glass-ionomer or resin cement lined amalgam restorations presented less dye leakage than copal varnish lined restorations (p < 0.05). No significant difference was observed in microleakage between IC or MD sectioning. Within the limitations of this study, it was concluded that cavity size and direction of section were not significant factors for microleakage, while substrate and intermediate materials had a significant effect on the sealing ability in amalgam restorations.
本研究验证了传统汞合金修复体和粘结汞合金修复体的体积与微渗漏之间的关系。此外，还研究了中间材料、基底以及切片方向对微渗漏的影响。选取了56颗牛切牙。在颊面和舌面制备标准V类洞。对于每颗牙齿，制备两种洞型尺寸，分别对应两种洞体积：一种较大（A），另一种较小（B）。洞的颈壁位于牙骨质/牙本质，切壁位于釉质。根据所使用的中间材料（玻璃离子水门汀、树脂水门汀、粘结系统和天然漆 - 对照）将牙齿分为四组（n = 28）。按照制造商的说明应用材料。修复后，对牙齿进行热循环处理。然后将它们浸入染料溶液中，并沿切颈（IC）和近远中（MD）两个方向切片以评估微渗漏。对数据进行非参数统计分析（Wilcoxon配对检验和Kruskal - Wallis检验）。两种洞型尺寸之间未发现显著差异。釉质中的渗漏在统计学上低于牙骨质/牙本质界面（p < 0.05）。在某些情况下，玻璃离子或树脂水门汀衬层的汞合金修复体比天然漆衬层的修复体表现出更少的染料渗漏（p < 0.05）。IC或MD切片之间在微渗漏方面未观察到显著差异。在本研究的局限性范围内，得出的结论是洞型尺寸和切片方向不是微渗漏的显著因素，而基底和中间材料对汞合金修复体的密封能力有显著影响。
