Two modes of nanoleakage expression in single-step adhesives

published_or_final_versio

Biomimetic intrafibrillar mineralization of type I collagen with intermediate precursors-loaded mesoporous carriers

published_or_final_versio

Compromised bonding of all-in-one adhesives upon delayed activation of light-cured composites

link_to_subscribed_fulltex

Fractographic analysis of dentin bonded with a moist or dry technique after microtensile bond testing

The development of the Superconducting QUantum Interference Device (or SQUID) as the most sensitive device known for thie measurement of changes in magnetic flux has presented new opportunities for the fields of geophysics [1] and biomagnetism [2]. In this paper we report on the use of SQUID instrumentation for nondestructive evaluation of electrically conducting and ferromagnetic specimens [3]. Specifically, we report preliminary experiments on the use of SQUIDs for the detection of defects (such as cracks, holes, weld seams, variations in wall thickness, etc.) in the walls of a hollow pipe, and for monitoring the magnetic state of a ferromagnetic sample under stress-strain loading conditions

Effect of pretreatment with quaternary ammonium silanes on dentin protease activity

Oral Presentation: no. 0074OBJECTIVES: Dentine matrices release ICTP and CTX fragments during collagen degradation. This study evaluated the effect of dentine pretreatment with Quaternary Ammonium Silanes (QAS) cavity disinfectants on matrix metalloproteinases (MMP) and cathepsin K-mediated collagen degradation. METHODS: Dentine beams (1 mm × 2 mm × 6 mm) were demineralized in 10 wt% H3PO4 for 24 h at 25oC. After baseline measurements of dry mass, beams were divided into 5 groups (n = 10/group) according to the disinfectants. The beams were pre-treated for 5 min with 2% QAS, 5% QAS, 10% QAS; 2% chlorhexidine (CHX), and control (no pretreatment), blot-dried and incubated in 1 mL calcium and zinc-containing medium (pH7.2) at 37oC for 3, 7 or 14 days. After incubation, the change in dry mass was calculated and aliquots of the incubation medium were analyzed for collagen C-telopeptides, ICTP and CTX using ELISA kits. Data was analyzed using two-way ANOVA and post hoc Tukey multiple test. RESULTS: The two factors (disinfectants and time) had significant effect on dry mass loss, ICTP and CTX release (p<0.001). The rate of dry mass loss increased with time and was significantly lower in the experimental groups (2% CHX, 2% QAS, 5% QAS, 10% QAS) when compared to control (p<0.001). No significant difference in dry mass loss was observed among the experimental groups at 7 and 14 days. The ICTP release decreased significantly with increasing QAS concentration at 7 days (p<0.001). No significant difference in ICTP and CTX release was observed among the experimental groups at 14 days. CONCLUSIONS: Quaternary ammonium silanes tested in this study can be good inhibitors of matrix metalloproteinases and cathepsin K activities in dentine