Associate Professor, Western Michigan University Homer Stryker M.D. School of Medicine
Unless otherwise specified skin care zinc oxide buy discount accuran, the intra-individual variation of zinc requirements is assumed to be 25 percent skin care 40 plus accuran 30mg with mastercard. Zinc absorption from diets in Malawi skin care while pregnant cheap 30mg accuran free shipping, Kenya acne aid soap discount accuran online master card, Mexico, and Guatemala was estimated to be 15 percent based on the high phytate-zinc molar ratio (37-42) in these diets, whereas an absorption of 30 percent was assumed for diets in Ghana, Guatemala, Egypt, and Papua New Guinea. Fermented maize and cassava products (kenkey, banku, and gari) in Ghana, yeast leavened wheat-based bread in Egypt, and the use of sago with a low phytate content as the staple in the New Guinean diets were assumed to result in a lower phytate-zinc molar ratio and a better availability. Most of the zinc supplementation studies have not provided dietary intake data, which could be used to identify the zinc intake critical for growth effects. In a recent study in Chile, positive effects on height gain in boys after 14 months of zinc supplementation was noted (44). Because only 15 percent of the zinc intake of the Chilean children was derived from flesh foods, availability was assumed to be relatively low. Krebs et al (45) observed no effect of zinc supplementation on human-milk zinc content or on maternal status of a group of lactating women and judged their intake sufficient to maintain adequate zinc status through 7 months or more of lactation. Reductions in urinary and faecal losses maintained normal plasma zinc concentrations over 5 weeks in 11 men with intakes of 2. A significant reduction of plasma zinc concentrations and changes in cellular immune response were observed. Sub-optimal zinc status has also been documented in pregnant women consuming diets with high phytate-zinc ratios (>17) (47). Frequent reproductive cycling and high malaria prevalence seemed to contribute to the impairment of zinc status. This knowledge is especially needed for understanding the role of zinc deficiency in the aetiology of stunting and impaired immunocompetence. For a better understanding of the relationship between diet and zinc supply, there is a need for further research to carefully evaluate the availability of zinc from diets typical of developing countries. The research should include an assessment of the effect of availability of adopting realistic and culturally accepted food preparation practises such as fermentation, germination, soaking, and inclusion of inexpensive and available animal protein sources in plant-food-based diets. Tissue zinc levels and zinc excretion during experimental zinc depletion in young men. Effect of dietary zinc on whole body surface loss of zinc: impact on estimation of zinc retention by balance method. Homeostatic control of zinc metabolism in men: zinc excretion and balance in men fed diets low in zinc. Changes in cytokine production and T cell subpopulations in experimentally induced zinc-deficient Humans. Methods for studying mineral and trace element absorption in Humans using stable isotopes. Kinetic analysis of zinc metabolism in Humans and simultaneous administration of 65Zn and 70Zn. Size of the zinc pools that exchange rapidly with plasma zinc in Humans: Alternative techniques for measuring and relation to dietary zinc intake. Zinc absorption estimated by fecal monitoring of zinc stable isotopes validated by comparison with whole-body retention of zinc radioisotopes in Humans. Zinc absorption, mineral balance, and blood lipids in women consuming controlled lactoovovegetarian and omnivorous diets for 8 wk. High- versus low-meat diets: effects on zinc absorption, iron status, and calcium, copper, iron, magnesium, manganese, nitrogen, phosphorus, and zinc balance in postmenopausal women. Reduction of the phytate content of bran by leavening in bread and its effect on absorption of zinc in man. Potential contribution of maternal zinc supplementation during pregnancy to maternal and child survival. Iron, copper, and zinc status: response to supplementation with zinc or zinc and iron in adult females. A 14-mo zinc-supplementation trial in apparently healthy Chilean preschool children. Zinc supplementation during lactation: effects on maternal status and milk zinc concentrations.
M 294 Milk thistle unlikely to affect the metabolism of other drugs that are substrates of this isoenzyme acne prescription medication accuran 40 mg sale. Milk thistle + Benzodiazepines Milk thistle does not appear to affect the pharmacokinetics of midazolam acne jawline 40 mg accuran. Evidence acne 35 weeks pregnant order 5 mg accuran with mastercard, mechanism skin care 1 month before wedding accuran 20 mg lowest price, importance and management In a study 19 healthy subjects were given milk thistle 300 mg three times daily for 14 days (standardised to silymarin 80%) with a single 8-mg oral dose of midazolam on the last day. There was no change in the pharmacokinetics of midazolam, and milk thistle had no effect on the duration of midazolam-induced sleep. Milk thistle + Digoxin Milk thistle does not appear to affect the pharmacokinetics of digoxin. Clinical evidence In a study, 16 healthy subjects were given a single 400-microgram dose of digoxin before and on the last day of a 14-day course of a milk thistle extract (standardised to 80% silymarin) 300 mg three times daily. Digoxin is a Pglycoprotein substrate, and it had been suggested that milk thistle would therefore affect digoxin pharmacokinetics. Importance and management Direct evidence appears to be limited to one clinical study, which showed that milk thistle does not cause clinically relevant changes in digoxin pharmacokinetics. It would therefore appear that the dose of digoxin would not need to be adjusted in patients also given milk thistle. As digoxin is used as a probe substrate for P-glycoprotein this study also suggests that milk thistle is unlikely to affect the metabolism of other drugs that are substrates of this transporter protein. Effect of milk thistle (Silybum marianum) and black cohosh (Cimicifuga racemosa) supplementation on digoxin pharmacokinetics in humans. Effects of the flavonoids biochanin A, morin, phloretin, and silymarin on P-glycoprotein-mediated transport. Milk thistle + Caffeine Milk thistle does not appear to affect the pharmacokinetics of caffeine. Evidence, mechanism, importance and management In a study in 12 healthy subjects, milk thistle 175 mg (standardised to silymarins 80%) given twice daily for 28 days had no significant effects on the metabolism of a single 100-mg dose of caffeine. Milk thistle + Chlorzoxazone Milk thistle does not appear to affect the pharmacokinetics of chlorzoxazone. Evidence, mechanism, importance and management In a study in 12 healthy subjects, milk thistle 175 mg (standardised to silymarins 80%) given twice daily for 28 days had no significant effects on the metabolism of a single 250-mg dose of chlorzoxazone. M Milk thistle + Irinotecan Milk thistle does not appear to affect the pharmacokinetics of irinotecan. Milk thistle Evidence, mechanism, importance and management A pharmacokinetic study was undertaken in 6 patients who were being treated with intravenous irinotecan 125 mg/m2 once weekly for 4 weeks, followed by a 2-week rest period. Four days before the second dose of irinotecan, a 14-day course of 200 mg milk thistle seed extract (containing silymarin 80%) three times daily was started. The pharmacokinetics of irinotecan and its metabolites did not differ from week 1 (no milk thistle), week 2 (4 days of milk thistle) to week 3 (12 days of milk thistle). The clinical study found that milk thistle may modestly delay the absorption of nifedipine with an apparent high intra-individual variability. However, as there was no considerable change in the pharmacokinetics or pharmacodynamic effects of nifedipine (blood pressure and heart rate), this is probably not clinically relevant. It would appear that the modest effects found in vitro do not translate in to a clinically relevant effect. Effect of silybin and its congeners on human liver microsomal cytochrome P450 activities. Milk thistle + Metronidazole Silymarin (the active constituent of milk thistle) modestly reduces metronidazole levels. Evidence, mechanism, importance and management Silymarin (Silybon) 140 mg daily was given to 12 healthy subjects for 9 days, with metronidazole 400 mg three times daily on days 7 to 10. See Milk thistle + Benzodiazepines, page 294, and Milk thistle + Protease inhibitors, below. Study on the influence of silymarin pretreatment on metabolism and disposition of metronidazole. Milk thistle + Protease inhibitors Although some studies have found that milk thistle slightly lowers indinavir levels, it appears that this is a time-dependent effect rather than a drug interaction, since it also occurred in a control group in one study. The balance of evidence suggests that no important pharmacokinetic interaction occurs. In vitro studies suggest that silibinin does not affect the pharmacokinetics of ritonavir.
Without their support skin care korea terbaik order genuine accuran on-line, cooperation skin care procter and gamble purchase 40 mg accuran visa, and personal commitments to excellence skin care associates purchase 30mg accuran visa, this review text could not have been completed acne quistico order accuran 40 mg on line. Alveolar Mucosa: Mucosa covering the basal part of the alveolar process and continuing without demarcation into the vestibular fornix and the floor of the mouth. Gingiva: the fibrous investing tissue, covered by keratinized epithelium, which immediately surrounds a tooth and is contiguous with its periodontal ligament and with the mucosal tissues of the mouth. The free marginal gingiva surrounds the tooth and is not directly attached to the tooth surface. The attached gingiva is the portion of the gingiva that is firm, dense, stippled, and tightly bound to the underlying periodontium, tooth, and bone. The free gingival margin generally corresponds to the base of the gingival sulcus. It is present in 30% to 40% of adults and most frequently occurs in the mandibular premolar and incisor regions. Width and Thickness of Gingiva Bowers (1963) measured the widths of the facial attached gingiva in the primary and permanent dentitions of 240 subjects. Values were greatest in the incisor regions (especially the lateral incisor) and the least in the canine and first premolar sites. The maxilla usually exhibited a broader zone of attached gingiva than the mandible. Clinically healthy gingiva was noted in subjects with less than 1 mm of attached gingiva, but the tissue was usually inflamed in areas of no attached gingiva. Buccal-lingual tooth position affected the amount of attached gingiva present, and high frenum and muscle attachments were generally associated with narrow zones of attached gingiva. In a series of studies, Andlin-Sobocki and Bodin (1993) confirmed the pattern of facial keratinized tissue widths in longitudinal observations of children. Increases in widths of facial attached and keratinized tissue were noted in primary and permanent teeth over 2 years. Changes in attached gingiva from a deciduous tooth to permanent successor were inconsistent, but if the deciduous tooth had less than 1 mm of attached gingiva at baseline, the permanent tooth had a wider zone of attached gingiva at the second examination. Facially-positioned teeth had narrower zones of attached and keratinized tissue than well-aligned or lingually-positioned teeth. As teeth moved lingually, an increase in the width of attached and keratinized tissue and a slight decrease in clinical crown height were observed. Teeth moving facially had a decrease in the width of the attached and keratinized tissue. Measurements of the width of lingual attached gingiva were performed by Voigt et al. Measurements were determined by subtracting the sulcus depth from the sulcus depth from the width of the keratinized tissue and ranged from 1 to 8 mm. With the progression from the primary to the permanent dentition, the width of the lingual attached gingiva decreased. Results demonstrated considerable variation of gingival thickness among subjects and among areas within individual subjects. Gingival Stippling Stippling refers to orange peel-like surface characteristics observed in attached gingiva of approximately 40% of the adult population. Gingiva and Oral Mucosa but, due to the variability of the presence or absence of stippling in healthy gingiva, it is now believed that one can only correlate the presence of inflammation with the loss of stippling, assuming that stippling was present previously. Owings (1969) performed a histologic study on the relationship between gingival stippling and keratinization of attached gingiva in 45 male subjects. Findings revealed that 76% of the gingiva exhibited parakeratosis with the remainder exhibiting orthokeratosis, regardless of the pattern of stippling. The glycogen in the attached gingiva was limited exclusively to the spinous layer of the epithelial ridges in tissue with a dense, diffuse pattern of stippling. Owings felt that stippling tended to develop at the intersection of the epithelial ridges due to a decrease in metabolic activity at the central portion.
Results indicated that there was no difference in compliance between sex skin care 50th and france discount accuran 20mg visa, age acne 19 years old generic 30mg accuran with mastercard, or disease severity acne nose order cheapest accuran and accuran. More non-compliant patients were smokers skin care kemayoran order accuran overnight delivery, whereas compliant patients had more periodontal surgery during treatment. A questionnaire was sent to non-compliant patients, with 40% of the patients replying. These efforts included attempts at simplifying compliance, maintaining records of compliance, informing patients of the consequences of non-compliance and attempting to identify non-compliers before active periodontal treatment. Results indicated that 32% were complete compliers, 48% were erratic, and 20% were non-compliers. Bone loss following periodontal therapy in subjects without frequent periodontal maintenance. Progression of periodontal disease in adult subjects in the absence of periodontal therapy. The significance of gingivitis during the maintenance phase of periodontal treatment. The healing potential of the periodontal tissues following different techniques of periodontal surgery in plaque-free dentitions. This increase was at the expense of the non-compliant group, and largely due to the efforts of the office. It was suggested that increased recognition and better patient education can help reduce the problem of noncompliance. Both full (75 to 100%) and erratic compliers (< 75%) were able to maintain periodontal health over time, but erratic compliers required more surgical retreatment. Smokers exhibited poorer oral hygiene, more tooth loss, and deeper probing depth compared to non-smokers. The percentage of compliance did not appear to change over time; however, the less frequently patients were required to come for recall, the greater their compliance: -70% of the patients were on 3month recall and 30% were on 4-month. Effect of controlled oral hygiene procedures on caries and periodontal disease in adults. Patient compliance with suggested maintenance recall in a private periodontal practice. Significance of frequency of professional tooth cleaning for healing following periodontal surgery. Compliance - A review of the literature and possible applications to periodontics. The results of efforts to improve compliance with supportive periodontal treatment in a private periodontal practice. Occlusal Trauma: An injury to the attachment apparatus as a result of excessive occlusal force. Occlusal Traumatism: Injury to the periodontium resulting from occlusal forces in excess of the reparative capacity of the attachment apparatus. Splints were classified as temporary, provisional, or permanent on the basis of duration and purpose. Temporary splints are those which are used less than 6 months during periodontal treatment and may or may not lead to other types of splinting. Provisional splints may be used from several months to years for diagnostic purposes, and usually lead to more permanent types of stabilization. Reversible mobility is found in a relatively normal periodontium that is capable of recovery following therapy. Other considerations include whether or not the periodontium is healthy or diseased and whether there is a need to prevent mobility or drifting. The author suggests that the rationale for splinting might include cases of post-acute trauma, prevention of drifting in normal dentitions during occlusal therapy, or to provide functional comfort by preventing mobility in diseased dentitions. Ferencz (1991) reviewed splinting and noted that there is little rationale for splinting teeth manifesting primary occlusal trauma. Mobility may inhibit periodontal repair during therapy and therefore provides an additional rationale for splinting. Short-term splints can be extracoronal (fixed or removable) or intracoronal (composite, wire with composite or amalgam). Provisional splints are designed to protect and stabilize teeth during therapy when definitive splinting with fixed restorations is planned later. According to the author, fixed splinting will provide the most effective means of long-term support.
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Nucleopore/Millipore Filters these are non-resorbable and require a second procedure for removal (Magnusson et al acne xarelto generic 40 mg accuran with mastercard. They consist of 2 parts: 1) an open microstructure collar to inhibit epithelial migration and 2) an occlusive apron that isolates the root surface from the surrounding tissues (Gottlow et al skin care 3m order accuran 10mg mastercard, 1986; Becker et al acne x tretorn order accuran with visa, 1987 tazorac 005 acne purchase accuran 10mg free shipping, 1988; Pontoriero et al, 1987, 1988; Schallhorn and McClain, 1988; Stahl et al, 1990; Caffesse et al, 1990; Lekovic et al, 1990; Seibert and Nyman, 1990). Biobrane Membrane this is a non-resorbable membrane which requires a second procedure for removal. It is a biocomposite consisting of an ultrathin, semi-permeable silicone membrane mechanically bonded to a flexible knitted nylon fabric and coated with hydrophilic collagen peptides. It is primarily a biological dressing that is used in the treatment of skin burns (Aukhil et al, 1986B). Polylactic Acid Membranes these are biodegradable and degradation is primarily by hydrolysis so a second procedure for removal is not required (Magnusson et al, 1988). The commercially available membrane consists of a polymer of polyactic acid which has been softened by a citric acid ester to facilitate handling. Continued Animal Model/ Number Human/5 Experimental Sites Molar/ nonmolar All teeth Experimental Model/Defect Intrabony defects Intrabony defects, est. No difference for recession, probing depth, clinical attachment gain; results unpredictable. Gore-Tex membrane 12 months 93% of all defects had 50% or greater fill Chung (1990) Human/10 Molar/nonmolar Intrabony defects 12 months Probing Attachment Level Gain (mean values) 0. Miscellaneous Ellegaard (1974) Human N/A Intrabony defects Free gingival grafts/ Autogenous bone grafts N/A Complete regeneration in 60% of defects; 10% with residual pockets > 3 mm 67% defect fill (average) 43% of defects with complete closure with bone fill. Clinical and volumetric analysis of three-wall intrabony defects following open flap debridement. The use of collagen membrane barriers in conjunction with combined demineralized bone-collagen gel implants in human infrabony defects. Clinical evaluation of a biodegradable collagen membrane in guided tissue regeneration. New periodontal attachment procedure based on retardation of epithelial migration. Periodontal tissue response to a new bioresorbable guided tissue regeneration device. Guided tissue regeneration with and without citric acid treatment in vertical osseous defects. Progenitor cell kinetics during guided tissue regeneration in experimental periodontal wounds. The significance of coronal growth of periodontal ligament tissue for new attachment formation. Collagen these membranes are biodegradable and do not require a second procedure for removal. Forms of collagen include: membranes, gels, atelocollagen (telopeptides pepsinized making it less antigenie), and avitene (microfibrillar collagen hemostat from purified bovine corium collagen) (Pfeifer et al. Freeze-Dried Dura Mater Allografts this is a resorbable human allograft material that is composed mainly of collagen and is devoid of immunogenicity (Yukna, 1992). While some risk of disease transmission exists, it can be reduced by the lyophilization and sterilization processes used. Salonen and Persson (1990) analyzed the growth and migration of gingival epithelial cells on materials with different surface properties. Differences in epithelial cell attachment and migration to varying substrata may be explained by their ability to bind glycoproteins to varying degrees. Scanning electron microscopic examination of these materials disclosed surface differences. Overall, these data suggested that the substrata not only provided contact guidance which influenced cell migration by the shape of the substratum surface, but also induced mitosis and migration because of their protein-binding capacity and wettability characteristics (Table 1). Clinical evaluation of the use of decalcified freeze-dried bone allograft with guided tissue regeneration in the treatment of molar furcation invasions.
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