In vitro retentive strength of zirconium oxide ceramic crowns using different luting agents
In vitro retentive strength of zirconium oxide ceramic crowns using different luting agents
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DOI：
10.1016/j.prosdent.2005.04.011
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发表时间：
2005-06-01
影响因子：
4.6
通讯作者：
Willershausen, B
中科院分区：
文献类型：
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作者：
Ernst, CP;Doz, P;Willershausen, B
陈述问题。与金牙冠相比，全瓷牙冠的固位强度的体外测定更困难，因为允许连接到测试装置的部件不容易整合到全瓷材料中。尽管如此，固位强度数据对于获得全瓷修复用粘结剂潜在临床性能的信息至关重要。因此，需要一种新的体外模型来评价全瓷冠的固位强度。本体外研究的目的是确定4种树脂-粘固剂系统的固位强度，复合体，玻璃离子粘固剂，树脂改性玻璃离子粘固剂，和用于粘结氧化锆陶瓷冠的自粘性树脂。将120颗离体牙随机分为12组（n = 10），并以标准化方式（5度锥度，3 mm咬合高度）进行准备。全瓷冠（Lava）以标准化的方式为每颗牙齿制作。根据制造商的建议，使用以下粘固剂和相应的粘结方案将牙冠吸引到牙齿上：CO，Compolute/EBS Multi; CO/RT，Compolute/EBS Multi/Rocatec; CB，Superbond C&B; CB/RT，Superbond C & B/Rocatec; CB/PL，Superbond C&B/Porcelain Liner M; PA，Panavia F; DC，Dyract Cem Plus/Xeno III; CH/PL，Chemiace II/Porcelain Liner M; RL，RelyX Luting，K/C，Ketac Cem/Ketac调理剂; K，Ketac Cem;和RU，RelyX Unicem。在热循环（5000次循环，5摄氏度-55摄氏度）后，对粘结氧化锆陶瓷牙冠的外表面进行处理（Rocatec）以改善粘结，然后放入低收缩环氧树脂块（Paladur）中。将每个样本的块/牙冠和牙齿组件连接到通用测试机的相对端，以便可以测量牙冠保持力。沿牙齿的插入路径沿着将牙冠从牙齿上取下。分别测定每颗牙齿的固位表面积（mm（2））。使用Wilcoxin精确检验（α = 0.05）和Bonferroni校正（α = 0.001）进行统计分析。中位数（最小/最大）固位强度值（MPa）如下：CO，1.7（0.6/4.3）; CO/RT，3.0（1.3/5.4）; CB，4.8（3.7/7.9）; CB/RT，8.1（4.2/12.7）; CB/PL，5.3（3.7/10.2）; PA，4.0（3.3/5.1）; DC，3.3（2.1/5.6）; CH/PL，4.0（1.3/6.3）; RL，4.7（2.8/.6）; K/C，1.8（0.6/2.3）; K，1.9（0.2/4.5）;和RU，4.8（2.5/6.7）。Superbond C&B（+ Rocatec）试样表现出最高的中值固位强度，但与未对全瓷冠内表面进行Rocatec预处理的Superbond C&B试样无显著差异。Compolute标本也没有明显受益于Rocatec预处理。在未对陶瓷进行预处理的材料中，Superbond C&B、Panavia、Dyract Cem Plus、RelyX Luting和RelyX Unicem显示出最高的中位固位强度值，并且没有显著差异。结论在本研究的条件下，复合体、树脂改性玻璃离子粘固剂和自粘性树脂粘接剂具有与树脂粘接剂Superbond C&B和Panavia相同水平的固位质量。陶瓷表面的Rocatec预处理没有改善Compolute和Superbond C&B的固位强度。
Statement of problem. in contrast to gold crowns, in vitro determination of the retentive strength of all-ceramic crowns is more difficult because components allowing connection to testing apparatus arc not as easily integrated into the all-ceramic material. Nevertheless, retentive strength data arc Crucial for obtaining information about the potential clinical performance of luting cements for all-ceramic restorations. Therefore, a new in vitro model was necessary to evaluate the retentive strength of all-ceramic crowns.Purpose. The purpose of this in vitro study was to determine the retentive strength of 4 resin-cement systems, a compomer, a glass-ionomer cement, a resin-modified glass-ionomer cement, and a self-adhesive resin for luting zirconium oxide ceramic crowns.Material and methods. One-hundred-twenty extracted human teeth were randomly divided into 12 groups (n = 10) and prepared in a standardized manner (5-degree taper, 3-mm occlusogingival height). All-ceramic crowns (Lava) were fabricated in a standardized manner for each tooth. The following cements and corresponding bonding regimens were used to lure the crowns to the teeth according to manufacturers' recommendations: CO, Compolute/EBS Multi; CO/RT, Compolute/EBS Multi/Rocatec; CB, Superbond C & B; CB/RT, Superbond C & B/Rocatec; CB/PL, Superbond C&B/Porcelain Liner M; PA, Panavia F; DC, Dyract Cem Plus/Xeno III; CH/PL, Chemiace II/Porcelain Liner M; RL, RelyX Luting, K/C, Ketac Cem/Ketac Conditioner; K, Ketac Cem; and RU, RelyX Unicem. After thermal cycling (5000 cycles, 5 degrees C-55 degrees C), the outer surfaces of the cemented zirconium oxide ceramic crowns were treated (Rocatec) to improve bonding and then placed into a low-shrinkage epoxy resin block (Paladur). The block/crown and tooth components for each specimen were connected to opposing ends of a universal testing machine so that crown retention could be measured. Crowns were removed from teeth along their path of insertion. The retentive surface area (mm(2)) was determined individually for each tooth. Statistical analyses were performed using the Wilcoxin exact test, (alpha=.05) and a Bonferroni correction (alpha=.001).Results. The median (minimum/maximum) retentive strength values (MPa) were as follows: CO, 1.7 (0.6/4.3); CO/RT, 3.0 (1.3/5.4); CB, 4.8 (3.7/7.9); CB/RT, 8.1 (4.2/12.7); CB/PL, 5.3 (3.7/10.2); PA, 4.0 (3.3/5.1); DC, 3.3 (2.1/5.6); CH/PL, 4.0 (1.3/6.3); RL, 4.7 (2.8/.6); K/C, 1.8 (0.6/2.3); K, 1.9 (0.2/4.5); and RU, 4.8 (2.5/6.7). Superbond C&B (+ Rocatec) specimens showed the highest median retentive Strength, but were not significantly different from Superbond C&B Without Rocatec pretreatment of the all-ceramic crown's inner surface. Compolute specimens also did not benefit significantly from the Rocatec pretreatment. Within the materials used without pretreatment of the ceramic, Superbond C&B, Panavia, Dyract Cem Plus, RelyX Luting, and RelyX Unicem showed the highest median retentive strength values and were not significantly different. Conclusion. Within the conditions of this study, the compomer, the resin-modified glass-ionomer cement, and the self-adhesive resin luting agent had the same level of retentive quality as the resin luting agents, Superbond C&B, and Panavia. Rocatec pretreatment of the ceramic surface did not improve the retentive strengths of Compolute and Superbond C&B.