https://www.cell.com/trends/biotechnology/pdf/S0167-7799(15)00070-0.pdf

Crosslinking biopolymers for biomedical applications.

Biomimetic approaches in bone tissue engineering: Integrating biological and physicomechanical strategies.

Crosslinking and the resultant changes in mechanical properties have been shown to influence cellular activity within collagen biomaterials. With this in mind, we sought to determine the effects of crosslinking on both the compressive modulus of collagen-glycosaminoglycan scaffolds and the activity of osteoblasts seeded within them. Dehydrothermal, 1-ethyl-3-3-dimethyl aminopropyl carbodiimide and glutaraldehyde crosslinking treatments were first investigated for their effect on the compressive modulus of the scaffolds. After this, the most promising treatments were used to study the effects of crosslinking on cellular attachment, proliferation, and infiltration. Our experiments have demonstrated that a wide range of scaffold compressive moduli can be attained by varying the parameters of the crosslinking treatments. 1-Ethyl-3-3-dimethyl aminopropyl carbodiimide and glutaraldehyde treatments produced the stiffest scaffolds (fourfold increase when compared to dehydrothermal crosslinking). When cells were seeded onto the scaffolds, the stiffest scaffolds also showed increased cell number and enhanced cellular distribution when compared to the other groups. Taken together, these results indicate that crosslinking can be used to produce collagen-glycosaminoglycan scaffolds with a range of compressive moduli, and that increased stiffness enhances cellular activity within the scaffolds.

/pdf/crosslinking-and-mechanical-properties-significantly-2d1gw6n81q.pdf

Crosslinking and mechanical properties significantly influence cell attachment, proliferation, and migration within collagen glycosaminoglycan scaffolds.

The systematic review was commissioned by the Australian National Health and Medical Research Council (NHMRC) to evaluate the scientific literature relating to the health effects of fluoride and fluoridation. The systematic review's research questions relate to the caries-reducing benefits and associated potential health risks of providing fluoride systemically (via addition to water, milk and salt) and the use of topical fluoride agents, such as toothpaste, gel, varnish and mouthrinse. Although the review summarises the recent evidence, it does not constitute health policy or clinical practice recommendations. A literature search was undertaken using the Medline and Embase databases (via www.embase.com
 ). In addition, the Cochrane Systematic Review and Clinical Trial databases were searched to help identify additional systematic reviews and original studies. Because of the availability of recent systematic reviews, searches were limited to publications from 1996 onwards . The search was conducted in December 2006 and limited to English-language publications. Based on types of intervention (individual or population) and the outcomes assessed (efficacy or safety), the hierarchy of study types considered most relevant for answering each of the clinical questions defined in this review was chosen (Table 1). The levels of evidence used by NHMRC for intervention and aetiological studies are summarised in Table 2.
 Screening of eligible studies was conducted by three reviewers. Data were extracted for all of the included systematic reviews and individual studies using standardised data-extraction forms. This included information about the study design, NHMRC level of evidence, population, intervention, comparator, outcome definitions and results. Information relating to potential biases and study quality were also extracted. Where appropriate, study results were pooled using standard meta-analysis techniques. In total, 5418 nonduplicate citations were identified. After applying the inclusion and exclusion criteria, 408 citations were considered potentially eligible for inclusion in the review. After the review of the full papers of potentially eligible articles, 77 citations were included in the review. The summary of findings was presented in the context of the research questions (Table 3).
 Fluoridation of drinking water remains the most effective and socially equitable means of achieving community-wide exposure to the caries prevention effects of fluoride. It is recommended (see also www.nhmrc.gov.au/news/media/rel07/_files/fluoride_flyer.pdf
 ) that water be fluoridated in the target range of 0.6–1.1 mg/l, depending on the climate, to balance reduction of dental caries and occurrence of dental fluorosis.n particular with reference to care in hospital for those following stroke.

/pdf/a-systematic-review-of-the-efficacy-and-safety-of-l84tk2wkvy.pdf

A systematic review of the efficacy and safety of fluoridation

Marine fish provide a rich source of bioactive compounds such as proteins and peptides The bioactive proteins and peptides derived from marine fish have gained enormous interest in nutraceutical, pharmaceutical, and cosmeceutical industries due to their broad spectrum of bioactivities, including antioxidant, antimicrobial, and anti-aging activities Recently, the development of cosmeceuticals using marine fish-derived proteins and peptides obtained from chemical or enzymatical hydrolysis of fish processing by-products has increased rapidly owing to their activities in antioxidation and tissue regeneration Marine fish-derived collagen has been utilized for the development of cosmeceutical products due to its abilities in skin repair and tissue regeneration Marine fish-derived peptides have also been utilized for various cosmeceutical applications due to their antioxidant, antimicrobial, and matrix metalloproteinase inhibitory activities In addition, marine fish-derived proteins and hydrolysates demonstrated efficient anti-photoaging activity The present review highlights and presents an overview of the current status of the isolation and applications of marine fish-derived proteins and peptides This review also demonstrates that marine fish-derived proteins and peptides have high potential for biocompatible and effective cosmeceuticals

Marine Fish Proteins and Peptides for Cosmeceuticals: A Review

Retentive and compressive strengths of modified zinc oxide-eugenol cements.

Eugenol Inhibited the Antimicrobial Functions of Neutrophils

Effect of circumferential undercut placement in the root canal wall on the retention of a tapered post in large and small root canals

Contributing factors of mandibular deformation during mouth opening.

Collagen sponges are widely used scaffolds in bone engineering. To form bone, the osteoblastic cells undergo proliferation, differentiation, and mineralization stages in the scaffold. Crosslinking and freezing temperature are two important variables in fabricating collagen sponges. The purpose of this study was to examine the osteoblastic responses to collagen sponges prepared with or without glutaraldehyde crosslinking at different freezing temperatures (-20 degrees C or -80 degrees C). MC3T3-E1 osteoblastic cells were cultured in differently prepared sponges. Osteoblastic responses examined included cell numbers, osteocalcin expression, and calcium deposition. Cell numbers were measured by DNA content. Osteocalcin expression was determined by RT-PCR and real-time RT-PCR. Calcium deposition was assayed by ortho-cresophthalein complexone method and von Kossa stain. The osteoblastic cells grown in all collagen sponges did not show apparent signs of cytotoxicity. Collagen sponges differed in freezing temperatures resulted in similar osteoblastic responses. Glutaraldehyde-crosslinked sponges demonstrated less cell-mediated contraction and more cell numbers at day 7 (p < 0.005). However, they showed lower osteocalcin expression at day 7 (p < 0.05) and less calcium deposition at day 21 (p < 0.001). In summary, different freezing temperatures played a minor role in osteoblastic responses. Glutaraldehyde crosslinking process, though improved the dimensional stability of collagen sponges, might compromise the osteoblastic differentiation and mineralization.

Osteoblastic response to collagen scaffolds varied in freezing temperature and glutaraldehyde crosslinking.

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