Int J Prosthodont. 2020 Sep/Oct;33(5):527-535. doi: 10.11607/ijp.6696.
To establish the most effective cementation protocol for bonding zirconia crowns to Ti-Base CAD/CAM abutments in terms of abutment height, cement type, and surface pretreatment.
Zirconia crowns were designed to fit abutments of 2.5-mm (short) and 4.0-mm (tall) height. The retention of conventional resin cement with a universal adhesive (RelyX Ultimate, 3M ESPE) was compared to self-adhesive resin cement (RelyX U200, 3M ESPE) following different surface pretreatments (n = 10/group): (1) no treatment (NT); (2) Ti-Base abutment surface blasting with alumina particles (SB); (3) zirconia crown tribochemical surface blasting with silica-coated alumina particles (TBS); and (4) a combination of SB + TBS. Pull-out testing was performed in a universal testing machine. Data were statistically evaluated using a linear mixed model following least significant difference post hoc test.
Pull-out data as a function of Ti-Base height demonstrated higher retention for tall compared to short abutments (P < .001). Ultimate outperformed U200 cement (data collapsed over height and pretreatment) (P < .001). Analysis of pretreatment depicted higher retention for SB + TBS, followed by SB, TBS, and NT (P < .04). The interaction between Ti-Base height and cement type highlighted the superior adhesive strength of Ultimate compared to U200 for both heights (P < .001). Irrespective of type of pretreatment, surface pretreatment improved the retention for U200 cement and short Ti-Base (P < .03 compared to NT). In contrast, higher retention was demonstrated for SB + TBS, followed by SB, TBS, and NT, for Ultimate cement combined with tall Ti-Base (P < .02) (data collapsed over height and cement, respectively).
There was a direct relationship among Ti-Base height, micromechanical and/or chemical pretreatment, and conventional adhesive bonding in improving the retention of zirconia crowns.
针对 Ti-Base CAD/CAM 基台的不同基台高度、粘结剂类型和表面预处理方法，确定粘结氧化锆全瓷冠最有效的粘结方案。
设计与 2.5mm（短）和 4.0mm（高）高度基台相匹配的氧化锆全瓷冠。通过不同的表面预处理（n = 10/组），比较传统树脂粘结剂（通用粘结剂 RelyX Ultimate，3M ESPE）与自粘结树脂粘结剂（RelyX U200，3M ESPE）的粘结效果：（1）无处理（NT）；（2）Ti-Base 表面喷砂氧化铝颗粒（SB）；（3）氧化锆冠表面砂磨硅涂层氧化铝颗粒（TBS）；（4）SB + TBS 联合处理。将试件置于万能材料试验机上进行拔出试验。采用最小显著差数法进行线性混合模型统计分析。
Ti-Base 高度与拔出力的关系显示，高基台的粘结力显著高于低基台（P <.001）。U200 粘结剂的粘结力明显低于 Ultimate（数据经高度和预处理合并）（P <.001）。预处理分析显示，SB + TBS 处理的粘结力最高，其次是 SB、TBS 和 NT（P <.04）。Ti-Base 高度和粘结剂类型的相互作用显示，对于两种高度的基台，Ultimate 的粘结强度均明显高于 U200（P <.001）。无论预处理类型如何，对于 U200 粘结剂和短基台，表面预处理均可提高粘结力（与 NT 相比，P <.03）。相比之下，对于高基台和 Ultimate 粘结剂，SB + TBS 处理的粘结力最高，其次是 SB、TBS 和 NT（P <.02）（数据分别经高度和粘结剂合并）。
Ti-Base 高度、微机械和/或化学预处理与传统粘结剂粘结均可直接提高氧化锆全瓷冠的粘结力。
