To determine the fluoride uptake in enamel and dentin, a fluoridating composite resin was fixed at a 100-microns distance from bovine enamel and dentin for 2 weeks. The results revealed a substantial increase in the level of fluoride in both enamel and dentin. This model investigation showed that the fluoride released by the composite resin was effectively taken up by the surrounding tissues. The fluoride released from the composite resin and the subsequent uptake by the tissues would be expected to protect against secondary caries.
Statement Of The Problem: One of the most important factors in the clinical longevity of composite resin restorations is proper adhesion, which is achieved using phosphoric acid. Different phosphoric acid products might affect the micro-shear bond strength of composite resin to enamel.
Purpose: The present study aimed to evaluate the micro-shear bond strength of composite resin to sound enamel using six different brands of acid-etch agents.
Statement Of The Problem: Dentin bonding with etch-and-rinse adhesives involves demineralizing the 5-8µm of the surface dentin to create micro space for resin infiltration. The presence of continuous fluid movement in dentin tubules and positive pulpal pressure prevents complete water replacement by resin monomers. This results in areas of demineralized dentin, which contain collagen fibers without resin infiltration.
Department of Dental and Oral Medicine and Cranio-maxillofacial and Oral Surgery, University Hospital for Conservative Dentistry and Periodontology, Medical University of Innsbruck, Innsbruck, Austria.
Introduction And Aims: We aimed to investigate the efficacy of air-polishing in restoring the original tooth colour of standardised tobacco-stained tooth specimens.
Methods: Seventy-two specimens consisting of half dentine and half enamel were daily exposed to the smoke of five cigarettes in an automated smoking chamber. Four repetitions of a 14-day smoking cycle were performed.
Unlike most herbivores, sauropod dinosaurs evolved simple teeth that were replaced rapidly. Sauropod craniodental morphology is conserved relative to that of many archosaur clades, but tooth breadth and replacement rate vary substantially. Two neosauropod clades, Titanosauria and Diplodocoidea, independently evolved both narrow-crowned teeth and high tooth replacement rates among a suite of other convergent features.
The Aim Of The Study: Was a comparative analysis of the structural features of the endodontic system and the thickness of hard dental tissues over the past ten centuries.
Materials And Methods: 180 teeth of people who lived from the X to XX centuries AD were studied using cone-beam computed tomography in endodontic mode: the volume of the endodontic system and the thickness of hard dental tissues were calculated using the algorithm developed by us. The Pearson correlation coefficient and Student's t-test were calculated in Excel program, and the data was analyzed with GraphPad Prism 8 Statistics Guide statistical program.
