Department of Dentistry, Faculty of Health Sciences, University of Brasília, Brasília, Brazil.
Dent Traumatol. 2020 Feb;36(1):51-57. doi: 10.1111/edt.12506. Epub 2019 Sep 8.
BACKGROUND/AIMS: Following coronal tooth fracture, keeping the fragment hydrated is of the utmost importance in the tooth fragment bonding technique. The aim of this study was to evaluate the effects of different immersion times in different storage media on multimode adhesive bonding between reattached fragments and teeth.
A total of 195 bovine incisors were fractured and randomized into the following storage groups (n = 15): G0-control group (sound tooth); GA-saline solution: for 1 hour (A1) or 24 hours (A2); GB-artificial saliva: for 1 hour (B1) or 24 hours (B2); GC-coconut water: for 1 hour (C1) or 24 hours (C2); GD-tap water: for 1 hour (D1) or 24 hours (D2); GE-milk: for 1 hour (E1) or 24 hours (E2); GF-dry (dehydration): for 1 hour (F1) or 24 hours (F2). Tooth fragments were then reattached using a multimode adhesive in a self-mode technique with a flowable resin composite. Fracture resistance was evaluated in a universal testing machine under a compressive load (1 mm/min). The data were submitted to two-way analysis of variance and the post hoc Tukey test (5%).
The group submitted to the dehydration factor (GF) exhibited a mean value of 599.1 ± 144.2 N, while those submitted to all hydration protocols (GA, GB, GC, GD, GE) exhibited a mean value of 751.8 ± 285.4 N. Dehydration significantly affected the fracture strength values (P = .005). No significant interaction between the rewetting solutions was observed (P > .05).
Hydration of the tooth fragment increased fracture resistance, regardless of the storage solution and/or immersion time.
背景/目的：冠状牙折后，保持牙碎片的湿润对牙碎片粘结技术至关重要。本研究旨在评估不同浸泡时间和不同储存介质对重新附着的牙碎片与牙齿之间多模式粘结的影响。
总共 195 颗牛切牙被折断，并随机分为以下储存组（n=15）：G0-对照组（正常牙）；GA-生理盐水：1 小时（A1）或 24 小时（A2）；GB-人工唾液：1 小时（B1）或 24 小时（B2）；GC-椰子水：1 小时（C1）或 24 小时（C2）；GD-自来水：1 小时（D1）或 24 小时（D2）；GE-牛奶：1 小时（E1）或 24 小时（E2）；GF-干燥（脱水）：1 小时（F1）或 24 小时（F2）。然后使用自模式技术和流动树脂复合材料将牙碎片重新附着。在万能试验机上以 1mm/min 的压缩载荷评估断裂阻力。将数据提交给双向方差分析和事后 Tukey 检验（5%）。
经历脱水因素（GF）的组表现出 599.1±144.2N 的平均值，而经历所有水合方案（GA、GB、GC、GD、GE）的组表现出 751.8±285.4N 的平均值。脱水显著影响断裂强度值（P=0.005）。再润湿溶液之间未观察到显著的相互作用（P>.05）。
无论储存溶液和/或浸泡时间如何，牙碎片的湿润都能增加断裂阻力。
