Sari Fatih, Ustun Ozlem, Kirmali Omer
1 Department of Prosthodontics, Faculty of Dentistry, Gaziantep University , Gaziantep, Turkey .
2 Department of Prosthodontics, Faculty of Dentistry, Akdeniz University , Antalya, Turkey .
Photomed Laser Surg. 2018 Apr;36(4):214-220. doi: 10.1089/pho.2017.4408.
This in vitro study evaluated the shear bond strength (SBS) of heat-cured denture base resin (PMMA) to acrylic resin teeth treated with different pretreatments, especially laser irradiation of different powers (1-4 W).
The acrylic resin teeth were separated into seven groups (n = 10) for the following different pretreatments: control group (no surface treatment) (G1), grinding with a tungsten carbide bur (G2), sandblasting (G3), and erbium, chromium: yttrium, scandium, gallium, garnet (Er,Cr:YSGG) laser irradiation at 1 W, 2 W, 3 W, 4 W output powers in (G4-7), respectively. Test specimens were produced according to the PMMA manufacturers' instructions and were subjected to a SBS test at a crosshead speed of 1 mm/min until fracture. Debonded surfaces were evaluated by a stereomicroscope for the type of failure. SEM (scanning electron microscope) analyses were done to estimate the surface changes of the acrylic resin teeth. The data were submitted using a one-way ANOVA and post hoc Tukey-Kramer multiple comparison tests (p = 0.05).
The highest bond strength was obtained in G3, and similar SBS values were considered in other groups, and no significant differences were found among the surface treatments and the control group (p < 0.05). All groups had a high percentage of adhesive failures.
Laser irradiations promote surface topography alterations. However laser irradiation of the adhesive surface was found ineffective. The SBS of acrylic resin teeth to a PMMA denture base material is independent of the surface pretreatments Er,Cr:YSGG laser irradiation, sandblasting, and grinding with a carbide bur. All the surface treatments provided a similar bond between the acrylic denture base and the teeth.
本体外研究评估了热固化义齿基托树脂（聚甲基丙烯酸甲酯，PMMA）与经不同预处理，特别是不同功率（1 - 4瓦）激光照射的丙烯酸树脂牙之间的剪切粘结强度（SBS）。
将丙烯酸树脂牙分为七组（每组n = 10）进行以下不同预处理：对照组（无表面处理）（G1）、用碳化钨车针打磨（G2）、喷砂处理（G3）以及分别用输出功率为1瓦、2瓦、3瓦、4瓦的铒铬：钇钪镓石榴石（Er,Cr:YSGG）激光照射（G4 - 7）。根据PMMA制造商的说明制作测试样本，并以1毫米/分钟的十字头速度进行SBS测试，直至断裂。通过体视显微镜评估脱粘表面的破坏类型。进行扫描电子显微镜（SEM）分析以估计丙烯酸树脂牙的表面变化。数据采用单因素方差分析和事后Tukey - Kramer多重比较检验进行分析（p = 0.05）。
G3组获得了最高的粘结强度，其他组的SBS值相近，表面处理组与对照组之间未发现显著差异（p < 0.05）。所有组的粘结失败率都很高。
激光照射会促进表面形貌改变。然而，发现对粘结表面进行激光照射无效。丙烯酸树脂牙与PMMA义齿基托材料之间的SBS与表面预处理（Er,Cr:YSGG激光照射、喷砂处理和用碳化钨车针打磨）无关。所有表面处理在丙烯酸义齿基托和牙齿之间提供了相似的粘结效果。
