The purpose of this study was: (1) to compare nanoleakage patterns of a conventional 3-step etch and rinse adhesive system and two experimental hydrophobic adhesive systems and (2) to investigate the change of the nanoleakage patterns after load cycling. Two kinds of hydrophobic experimental adhesives, ethanol containing adhesive (EA) and methanol containing adhesive (MA), were prepared. Thirty extracted human molars were embedded in resin blocks and occlusal thirds of the crowns were removed. The polished dentin surfaces were etched with a 35% phosphoric acid etching gel and rinsed with water. Scotchbond Multi-Purpose (MP), EA and MA were used for bonding procedure. Z-250 composite resin was built-up on the adhesive-treated surfaces. Five teeth of each dentin adhesive group were subjected to mechanical load cycling. The teeth were sectioned into 2 mm thick slabs and then stained with 50% ammoniacal silver nitrate. Ten specimens for each group were examined under scanning electron microscope in backscattering electron mode. All photographs were analyzed using image analysis software. Three regions of each specimen were used for evaluation of the silver uptake within the hybrid layer. The area of silver deposition was calculated and expressed in gray value. Data were statistically analyzed by two-way ANOVA and post-hoc testing of multiple comparisons was done with the Scheffe's test. Silver particles were observed in all the groups. However, silver particles were more sparsely distributed in the EA group and the MA group than in the MP group (p < .0001). There were no changes in nanoleakage patterns after load cycling.

Citations

Citations to this article as recorded by  

• The effect of the removal of chondroitin sulfate on bond strength of dentin adhesives and collagen architecture
  Jong-Ryul Kim, Sang-Jin Park, Gi-Woon Choi, Kyoung-Kyu Choi
  Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 211.     CrossRef
• The effect of priming etched dentin with solvent on the microtensile bond strength of hydrophobic dentin adhesive
  Eun-Sook Park, Ji-Hyun Bae, Jong-Soon Kim, Jae-Hoon Kim, In-Bog Lee, Chang-Keun Kim, Ho-Hyun Son, Byeong-Hoon Cho
  Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 42.     CrossRef

The purpose of this study was to evaluate the apical sealing ability of Super-EBA, MTA and Dyract-flow as retrofilling materials. Forty-eight extracted human teeth with straight and single root canal were used in this study. The root canals were prepared to a #40 apical canal size and obturated with gutter-percha. Apicoectomies were performed and root end cavities were prepared to a depth of 3mm using an ultrasonic device. The root end cavities were filled with Super-EBA, MTA or Dyract-flow. Leakage was measured using an electrochemical technique for 4 weeks.

According to this study, the results were as follows.

1. Increasing leakage with time was observed in all groups.

2. No significant difference was noted among the 3 groups with time (p = 0.216).

3. No significant difference was noted among the 3 groups when measured within the same time interval (p = 0.814).

The results of this study suggest that the sealing ability of Dyract-flow is equal to that of Super-EBA and MTA, and Dyract-flow may be an alternative to other materials for root-end filling.

Citations

Citations to this article as recorded by  

• Evaluation of Sealing Effect and Working Time of Root Canal Filling MTA Materials
  Hyojin Kim, Youngjin Kim, Soonhyeun Nam, Kwon Taeyub, Hyunjung Kim
  THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY.2016; 43(2): 129.     CrossRef
• Comparative analysis of physicochemical properties of root perforation sealer materials
  Maura Cristiane Gonçales Orçati Dorileo, Fábio Luis Miranda Pedro, Matheus Coelho Bandeca, Orlando Aguirre Guedes, Ricardo Dalla Villa, Alvaro Henrique Borges
  Restorative Dentistry & Endodontics.2014; 39(3): 201.     CrossRef