Dynamic versus static bond-strength testing of adhesive interfaces

作者：Poitevin Andre; De Munck Jan; Cardoso Marcio Vivan; Mine Atsushi; Peumans Marleen; Lambrechts Paul; Van Meerbeek Bart^*

来源：Dental Materials, 2010, 26(11): 1068-1076.

DOI：10.1016/j.dental.2010.07.007

• Micro-tensile fatigue resistance
• Micro-tensile bond strength
• Adhesive
• Dentin
• Bond degradation
• Clinical relevance

A static bond-strength test is often regarded as clinically less relevant, since such abrupt loading of the adhesive-tooth bond clinically never occurs. Therefore, dynamic fatigue testing is often claimed to better predict the clinical effectiveness of adhesives.
Objectives. To measure the micro-tensile fatigue resistance (mu TFR) of adhesives bonded to dentin, and to compare their mu TFR to their micro-tensile bond strength (mu TBS).
Methods. The bonding effectiveness (including fracture analysis) of three adhesives (OptiBond FL, Kerr: 3-step etch-and-rinse adhesive or 3-E & Ra; Clearfil SE, Kuraray: 2-step self-etch adhesive or 2-SEa; G-Bond, GC: 1-step self-etch adhesive or 1-SEa) was measured by means of both a dynamic mu TFR and a static mu TBS approach. Preparation and test set-up of the micro-specimens were identical for both tests. In fatigue, specimens were tested with a wide range of selected loads at 2 Hz and at 10 Hz until failure, or until 104 cycles were reached. At 2 Hz, the mu TFR was also measured after 3-month water storage. The mu TFR was determined using a logistic regression model. Two-way ANOVA and Tukey HSD multiple comparisons test were used to determine statistical differences in mu TBS.
Results. The 1-SEa recorded significantly lower values in mu TFR at 10 Hz and in mu TBS than the 2-SEa and 3-E&Ra. The 1-SEa and the 2-SEa performed significantly lower in mu TFR than the 3-E&Ra, when tested at 2 Hz after 3-month water storage. Fatigue testing at 2 Hz after 1-week water storage did not reveal any differences in mu TFR between the three adhesives.
Significance. The 3-E&Ra performed best in terms of bonding effectiveness, irrespective of the experimental condition or test used. The mu TBS test proved once more to be a reliable laboratory test in ranking contemporary adhesives on their bonding effectiveness.

• 出版日期2010-11