Biomaterials Research Group, School of Dentistry, University of Manchester, Higher Cambridge Street, Manchester, UK.
Dent Mater. 2010 Apr;26(4):387-95. doi: 10.1016/j.dental.2010.01.001. Epub 2010 Feb 1.
To investigate the effect of three different primers on shear and peel bond strengths between three maxillofacial silicone elastomers and an acrylic resin after 360 h of accelerated daylight-aging.
Peel and shear-bond strengths of three maxillofacial silicone elastomers (TechSil S25, Cosmesil M511, Cosmesil Z004) to acrylic denture resin bases using three adhesive primers (611, A304, A330-G) were assessed at baseline and after 360 h of accelerated artificial light-aging. Data were collected and statistically analyzed by two-way ANOVA, one-way ANOVA, and Bonferroni post hoc tests (alpha=0.05). Independent t-test was used to investigate the effect of light-aging on bond strengths (alpha=0.05). Modes of failure were visually analyzed and categorized as adhesive, cohesive, or mixed.
In the peel bond test, at both baseline and after aging, there was a significant influence of primers and silicones on bond strength (p<0.001) and a strong interaction was also found between primers and silicones (p<0.05). Peel bond strengths ranged from 0.85 to 5.31 and 0.76 to 8.22 N/mm at baseline and after aging, respectively. The Z004 and 611 and Z004 and A330-G combinations showed the highest peel bond strength (5.31 and 8.22 N/mm, respectively) (p<0.05), as baseline and after aging. In the shear-bond test, there was only a significant influence of silicones on shear-bond strength (p<0.001), whereas primers did not affect it (p>0.05), and no interaction between primers and silicones was found (p>0.05). Shear-bond strengths ranged from 0.42 to 0.66 and 0.48 to 1.00 MPa at baseline and after aging, respectively. The combinations of Z004 and 611, Z004 and A304, Z004 and A330-G, M511 and A304, M511 and A330-G exhibited the highest bond strength (0.59-0.65 MPa) at baseline, and the Z004 with any of the primers (611, A304, and A330-G) showed greater bond strengths (0.89-1.00 MPa) (p<0.05) after aging. All the silicone elastomers at baseline, regardless of the adhesive primers, failed predominantly by cohesive debonding under peel and shear forces (68.9% and 100% respectively). However, after light-aging, peel and shear forces predominantly exhibited adhesive (79.5%) and cohesive (84.4%) failures, respectively.
Shear and peel test-regimes were both relevant and suitable for studying bonding and debonding characteristics of maxillofacial silicone elastomers bonded to an autopolymerising acrylic resin. The silicone/acrylic bond strengths were different for shear versus peel tests: 0.42-1.00 MPa for shear and 0.51-8.22 N/mm for peel. Cohesive failures were predominant with shear-tests, whereas peel-tests showed predominant cohesive failures at baseline but adhesive failures after light-aging. The optimum bonding achieved (best bonding at baseline that increased or was unaffected after light-aging) varied between shear and peel. For shear, it was achieved using Cosmesil Z004, with any primer, and M511 (but only with A304, and 330-G primers). For peel, it was achieved using both Cosmesil Z004 and TechSil S25 bonded using A330-G primer. Consequently, Cosmesil Z004 along with primer A330-G was the optimum silicone/primer combination to select on the basis of bond strengths.
A wide variety of new maxillofacial silicone elastomers and primers used in this study gave serviceable bond strengths. However, Cosmesil Z004 along with primer A330-G gave the optimum silicone/primer combination to select on the basis of bond strengths.
研究三种不同底涂剂对三种颌面硅橡胶与丙烯酸树脂在加速日光老化 360 小时后的剪切和剥离粘结强度的影响。
使用三种底涂剂（611、A304、A330-G）对三种颌面硅橡胶（TechSil S25、Cosmesil M511、Cosmesil Z004）与丙烯酸树脂义齿基托进行剪切和剥离粘结强度测试，在基线和加速人工光照老化 360 小时后进行评估。采用双向方差分析、单向方差分析和 Bonferroni 事后检验（α=0.05）收集和统计分析数据。采用独立 t 检验来研究光照老化对粘结强度的影响（α=0.05）。通过视觉分析和分类来确定失效模式，包括粘结、内聚或混合。
在剥离粘结试验中，无论是基线还是老化后，底涂剂和硅橡胶对粘结强度都有显著影响（p<0.001），并且底涂剂和硅橡胶之间也存在强烈的相互作用（p<0.05）。剥离粘结强度范围分别为基线时的 0.85-5.31 和老化后的 0.76-8.22 N/mm。Z004 和 611 以及 Z004 和 A330-G 组合显示出最高的剥离粘结强度（分别为 5.31 和 8.22 N/mm）（p<0.05），无论是基线还是老化后。在剪切粘结试验中，硅橡胶对剪切粘结强度有显著影响（p<0.001），而底涂剂没有影响（p>0.05），并且底涂剂和硅橡胶之间没有相互作用（p>0.05）。剪切粘结强度范围分别为基线时的 0.42-0.66 和老化后的 0.48-1.00 MPa。Z004 和 611、Z004 和 A304、Z004 和 A330-G、M511 和 A304、M511 和 A330-G 组合在基线时表现出最高的粘结强度（0.59-0.65 MPa），而 Z004 与任何一种底涂剂（611、A304 和 A330-G）在老化后都表现出更高的粘结强度（0.89-1.00 MPa）（p<0.05）。所有硅橡胶弹性体在基线时，无论使用哪种底涂剂，在剥离和剪切力下主要表现为内聚破坏（分别为 68.9%和 100%）。然而，在光照老化后，剥离和剪切力主要表现为粘结（79.5%）和内聚（84.4%）失效。
剪切和剥离试验对研究颌面硅橡胶与自聚合丙烯酸树脂粘结和脱粘的特性都是相关和适用的。硅橡胶/丙烯酸树脂的粘结强度在剪切和剥离试验中有所不同：剪切试验为 0.42-1.00 MPa，剥离试验为 0.51-8.22 N/mm。剪切试验中主要表现为内聚破坏，而剥离试验中基线时主要表现为内聚破坏，但光照老化后表现为粘结破坏。最佳粘结效果（基线时的最佳粘结效果，光照老化后增加或不受影响）在剪切和剥离之间有所不同。对于剪切，使用 Cosmesil Z004 与任何一种底涂剂，以及 M511（但仅与 A304 和 330-G 底涂剂一起使用）都可以达到最佳效果。对于剥离，使用 Cosmesil Z004 和 TechSil S25 与 A330-G 底涂剂结合可以达到最佳效果。因此，根据粘结强度，Cosmesil Z004 与底涂剂 A330-G 的组合是选择硅橡胶/底涂剂组合的最佳选择。
本研究中使用的多种新型颌面硅橡胶弹性体和底涂剂提供了可接受的粘结强度。然而，Cosmesil Z004 与底涂剂 A330-G 的组合是根据粘结强度选择硅橡胶/底涂剂组合的最佳选择。
