Nakhaei Mohammadreza, Dashti Hossin, Baghbani Atefe, Ahmadi Zahra
Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Prosthodontics, Faculty of Dentistry, Northern Khorasan University of Medical Sciences, Bojnourd, Iran.
Dent Res J (Isfahan). 2020 Jan 21;17(1):34-39. eCollection 2020 Jan-Feb.
The type of housing retaining material may affect the bond strength of the housing to denture base resin. The aim of this study was to evaluate the bond strength of locator housing attached to polymethyl methacrylate (PMMA) denture base resin secured with different retaining materials.
In this study Forty-four PMMA blocks (10 mm × 15 mm × 15 mm) were prepared with a central cylindrical canal inside to allow the insertion of locator housings. The prepared specimens were then randomly divided into four groups ( = 11). Each group received one of the following retaining materials for housing insertion: Auto-polymerized acrylic resin (APAR), auto-polymerized composite resin (Quick up), application of alloy primer on titanium housing plus Quick up (AL-Quick), and heat-polymerized acrylic resin (HPAR). The specimens were thermocycled 5000 times between 5°C and 55°C, followed by 1000 cycles of vertical insertion separation on the locator abutment. A push-out force was applied on the flat back surface of the housing after which the failure and shear bond strength values were calculated. The data were analyzed using one way-ANOVA and Games-Howell test (α = 0.05).
HPAR group had significantly higher shear bond strength values compared to the other groups ( < 0.05). No significant differences were found among the other remaining material groups ( > 0.05).
Inserting of locator housing using HPAR resulted in higher bond strength between housing and denture base resin. The application of alloy primer did not improve the bond strength of locator housing which was retained with "Quick up".
基托固位材料的类型可能会影响基托与义齿基托树脂之间的粘结强度。本研究的目的是评估使用不同固位材料固定在聚甲基丙烯酸甲酯（PMMA）义齿基托树脂上的定位器基托的粘结强度。
在本研究中，制备了44个PMMA块（10mm×15mm×15mm），内部有一个中心圆柱形通道，以允许插入定位器基托。然后将制备好的标本随机分为四组（每组n = 11）。每组接受以下用于基托插入的固位材料之一：自凝丙烯酸树脂（APAR）、自凝复合树脂（Quick up）、在钛基托上应用合金底漆加Quick up（AL-Quick）和热凝丙烯酸树脂（HPAR）。标本在5°C至55°C之间进行5000次热循环，然后在定位器基台上进行1000次垂直插入分离循环。在基托的平背面施加推出力，之后计算失败和剪切粘结强度值。使用单因素方差分析和Games-Howell检验（α = 0.05）对数据进行分析。
与其他组相比，HPAR组的剪切粘结强度值显著更高（P < 0.05）。其他剩余材料组之间未发现显著差异（P > 0.05）。
使用HPAR插入定位器基托可导致基托与义齿基托树脂之间具有更高的粘结强度。合金底漆的应用并未提高用“Quick up”固定的定位器基托的粘结强度。
