Isabelle Behlau

In 2017, Europe implemented a ban on amalgam restorations for children aged <15 years and for pregnant/breastfeeding women, highlighting the need for alternative filling materials exhibiting less surface roughness and enhanced longevity. This in vitro study aimed to examine the surface roughness variations of five amalgam-replacement materials across three time points and using six finishing methods: (1) no finishing (control), (2) Arkansas burs, (3) diamond burs, (4) tungsten carbide burs, (5) SofLex discs in descending grit size, and (6) coarse SofLex discs combined with silicone polishing. We prepared 960 samples. Each material group, i.e., Cention Forte (CNF), DeltaFil (DLF), Ketac Universal (KTU), IonoStar Molar (ISM), and Equia Forte HT (EQF), comprised 60 samples (n = 10 per finishing method) created using standardized 3D-printed metal molds. Surface roughness (Sa) was measured immediately after finishing, after 30 days of storage in distilled water, and after thermocycling (5000 cycles) using a non-contact profilometer. The results indicate that conventional and hybrid glass-ionomer cements have smoother surfaces than high-viscosity GICs. The DLF and CNF groups exhibited stable outcomes. These findings underscore the importance of selecting appropriate finishing methods based on the restorative material to minimize surface roughness.

Dental fear still causes health risks and high costs for health insurances due to the common avoidance of dental visits by dentally fearful patients. Selective attention may be a potential trigger of dental fear. The aim of the present studies was to investigate the influence of threatening dental stimuli in image combinations on the performance in a visual search task. In three studies, we compared the influence of dental stimuli with pictures of weapons or accidents and different distractors, i.e., cutlery, animals, landscapes. In the first two studies, participants had to decide if a target is available in a 3 × 3 matrix or not. In the third experiment, participants had to decide if a threatening or a neutral stimulus was the target. In all three studies we could replicate the finding that there is a threat-superiority-effect as well as a disengagement-effect for dental stimuli in visual search tasks. Dental stimuli were not only detected faster than deciding that no dental stimulus is available with different distractors, but dental stimuli also decreased search performance within the 3 × 3 matrices when presented as distractors. This is the first paper that demonstrates that dental stimuli that are associated with a negative threatening valence attract attention very quickly in the context of non-threatening stimuli. Future studies should investigate if a distraction from these threatening stimuli or a habituation to these threatening stimuli could reduce dental fear.