The aim of this study was to evaluate the use of bonded partial restorations compared with full-coverage porcelain-fused-to-metal (PFM) crowns as a viable treatment option for endodontically treated posterior teeth. Forty-five recently extracted maxillary first premolars were collected, endodontically treated, and mounted in acrylic blocks. The specimens were randomly divided into three groups and prepared to receive their respective restorations. The teeth in group 1 received full-coverage porcelain-fused-to-metal crowns. The teeth in group 2 received bonded partial restorations made from pressed ceramics (lithium disilicate) involving a functional cusp (palatal). Finally, group 3 received bonded partial restorations made from pressed ceramics involving the buccal cusp and keeping a functional cusp (palatal) intact. All group 1 restorations were cemented using glass ionomer cement. Restorations in groups 2 and 3 were bonded using a dual-cured resin cement. All specimens were subjected to an aging process and tested for shear bond strength using a universal loading machine. The mean force applied in Newtons to cause failure for group I was 674.90 ± 94.16 N, for group 2, 463.46 ± 61.11 N, and for group 3, 849.33 ± 68.92 N. P values obtained using one-way analysis of variance showed a highly significant difference between groups 2 and 3 (P = .001), groups 1 and 2 (P = .001), and groups 1 and 3 (P = .001). The fracture modes observed in all groups involved restorations and tooth fracture. This in vitro study suggests that endodontically treated posterior teeth with intact functional cusps can be restored with bonded partial porcelain restorations. However, if the loss of tooth structure involves the functional cusp, full-coverage PFM crowns are the treatment of choice.
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http://dx.doi.org/10.11607/prd.1706 | DOI Listing |
Angew Chem Int Ed Engl
December 2024
TU Berlin University: Technische Universitat Berlin, Fachbereich Keramische Werkstoffe, Hardenbergstr. 40, 10623, Berlin, GERMANY.
Carbon dioxide hydrogenation to methanol is a key chemical reaction to store energy in chemical bonds, using carbon dioxide as an energy sink. Indium oxide is amongst the most promising candidates for replacing the copper and zinc oxide catalyst, which is industrially applied for syngas mixtures but less idoneous for educts with carbon dioxide due to instability reasons. The polymorph of indium oxide and the operating conditions remain to be optimized for optimal and stable performance.
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January 2025
Laboratoire d'Optique et Biosciences (CNRS UMR7645, INSERM U1182), Ecole Polytechnique, Institut polytechnique de Paris, Palaiseau, France.
Folates comprise a crucial class of biologically active compounds related to folic acid, playing a vital role in numerous enzymatic reactions. One-carbon metabolism, facilitated by the folate cofactor, supports numerous physiological processes, including biosynthesis, amino acid homeostasis, epigenetic maintenance, and redox defense. Folates share a common pterin heterocyclic ring structure capable of undergoing redox reactions and existing in various protonation states.
View Article and Find Full Text PDFTalanta
December 2024
NMPA Key Laboratory for Technology Research and Evaluation of Drug Products, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250012, China; Shandong Engineering Research Center for Transdermal Drug Delivery Systems, Jinan, Shandong, 250000, China; National Glycoengineering Research Center, Shandong University, Jinan, Shandong, 250012, China. Electronic address:
Esophageal cancer (EC), the fifth most common cause of cancer-related mortality in China, poses a significant threat to public health. Among the pathological types, esophageal squamous cell carcinoma (ESCC) is predominant, comprising approximately 90 % of cases. Screening is crucial for early detection, diagnosis and treatment, thereby reducing ESCC mortality.
View Article and Find Full Text PDFJ Biomed Mater Res A
January 2025
Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo, Norway.
The eggshell membrane (ESM), resembling the extracellular matrix (ECM), acts as a protective barrier against bacterial invasion and offers various biofunctions due to its porous structure and protein-rich composition, such as ovalbumin, ovotransferrin, collagen, soluble protein, and antimicrobial proteins. However, the structure of ESM primarily comprises disulfide bonds and heterochains, which poses a challenge for protein solubilization/extraction. Therefore, the method of dissolving and extracting bioactive protein components from ESM has significant potential value and importance for exploring the reuse of egg waste and environmental protection.
View Article and Find Full Text PDFPhys Rev E
November 2024
Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, California 90089-2531, USA.
Statistics of diffusion, modeled by random walks, such as the mean number of distinct sites visited S(t) at time t, the mean probability P_{0}(t) of being at the origin of the walk, and the mean-squared displacements 〈R^{2}(t)〉 of the random walkers have been studied extensively in the past in both regular lattices and such disordered media as percolation clusters and other fractal structures, and universal power laws for such quantities have been derived. S(t) provides insight into reaction properties of geological formations, while P_{0}(t) is directly linked with the problem of back diffusion in remediation of groundwater aquifers. In all such studies, it was assumed that the conductances of the bonds that connect nearest-neighbor sites of the lattices are equal.
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