Chen Xiwen, Zhang Yixin, Zhou Jinru, Chen Chenfeng, Zhu Zhimin, Li Lei
State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China.
Exp Ther Med. 2018 Feb;15(2):2006-2014. doi: 10.3892/etm.2017.5630. Epub 2017 Dec 14.
The aim of this study was to investigate the adhesive property of palladium-silver alloy (Pd-Ag) and the simulated clinical performance of Pd-Ag porcelain-fused-to-metal (PFM), resin-bonded, fixed partial dentures (RBFPDs). A total of 40 Pd-Ag discs (diameter=5 mm) were prepared and divided into the following four groups (n=10): a) No sandblasting, used as a control; and b, 50 µm; c, 110 µm; and d, 250 µm aluminum oxide (AlO) particles, respectively. Another 50 discs were pre-sandblasted and divided into five groups (n=10) subjected to different treatments: e) Sandblasting, used as a control; f) silane; g) alloy primer; h) silica coating + silane and i) silica coating + alloy primer. All 90 discs were bonded to enamel with Panavia F 2.0 and then subjected to shear bond strength (SBS) testing. The fracture surfaces were examined by scanning electron microscopy. Next, 40 missing maxillary second premolar models were restored with one of the four following RBFPD designs (n=10): I) A premolar occlusal bar combined with molar double rests (MDR); II) both occlusal bars with a wing (OBB); III) a premolar occlusal bar combined with a molar dental band (MDB); and IV) two single rests adjacent to the edentulous space with a wing (SRB) used as a control. All specimens were aged with thermal cycling and mechanical loading. Subsequently, they were loaded until broken. The data were analyzed by one-way analysis of variance. AlO (250 µm) abrasion provided the highest SBS (P<0.05). The alloy primer and silica + silane exhibited increased SBS. Furthermore, fracture analysis revealed that the failure mode varied among the different treatments. Whereas MDB exhibited the highest retention (P<0.05), that of OBB was greater than that of MDR (P<0.05), and the control exhibited the lowest retention. Abrasion with AlO (250 µm) effectively increased the adhesive property of Pd-Ag. Additionally, treatment with the alloy primer and silica coating + silane was able to increase the adhesive property of abraded Pd-Ag. Under the present conditions, all three modified retainer types provided improved outcomes for Pd-Ag PFM RBFPDs compared with the control.
本研究的目的是调查钯银合金（Pd-Ag）的粘结性能以及Pd-Ag烤瓷熔附金属（PFM）、树脂粘结固定局部义齿（RBFPD）的模拟临床性能。制备了40个Pd-Ag圆盘（直径 = 5 mm），并分为以下四组（n = 10）：a）不喷砂，用作对照；b）50 µm；c）110 µm；d）250 µm的氧化铝（AlO）颗粒。另外50个圆盘预先喷砂并分为五组（n = 10）进行不同处理：e）喷砂，用作对照；f）硅烷；g）合金底漆；h）二氧化硅涂层 + 硅烷；i）二氧化硅涂层 + 合金底漆。所有90个圆盘用Panavia F 2.0粘结到牙釉质上，然后进行剪切粘结强度（SBS）测试。通过扫描电子显微镜检查断裂表面。接下来，用以下四种RBFPD设计之一修复40个上颌第二前磨牙缺失模型（n = 10）：I）前磨牙咬合杆联合磨牙双支托（MDR）；II）两个带翼的咬合杆（OBB）；III）前磨牙咬合杆联合磨牙牙带（MDB）；IV）两个与无牙间隙相邻带翼的单支托（SRB），用作对照。所有标本经过热循环和机械加载老化处理。随后，加载直至破坏。数据采用单因素方差分析。AlO（250 µm）磨损提供了最高的SBS（P<0.05）。合金底漆和二氧化硅 + 硅烷表现出更高的SBS。此外，断裂分析表明不同处理的失效模式不同。虽然MDB表现出最高的固位力（P<0.05），OBB的固位力大于MDR（P<0.05），对照表现出最低的固位力。AlO（250 µm）磨损有效提高了Pd-Ag的粘结性能。此外，用合金底漆和二氧化硅涂层 + 硅烷处理能够提高磨损后Pd-Ag的粘结性能。在当前条件下，与对照相比，所有三种改良固位体类型均为Pd-Ag PFM RBFPDs提供了更好的结果。
