By G. Potros. Concordia College, Moorhead Minnesota. 2018.
The required o dryness depends on the generator kamagra chewable 100 mg line, but the maximum operating dew point is unlikely to be above -60 C and o may be lower than -80 C (Langlais et al generic 100 mg kamagra chewable mastercard, 1991) order kamagra chewable 100mg with mastercard. To achieve this level of dryness kamagra chewable 100 mg with visa, desiccant driers are used order kamagra chewable 100 mg line, with parallel beds that alternate between drying and regenerating modes. Larger systems may also have refrigerant driers upstream of the desiccant driers to reduce the moisture loading, and some further upstream drying may also be achieved by compression. The air must be free from dust particles, which can cause arcing and a loss of efficiency, and hydrocarbons, the presence of which reduces efficiency. For larger installations, a medium frequency, variable voltage supply is used to reduce power costs and because it allows for a higher output of ozone. Medium frequency units may require a higher operating pressure (Langlais et al, 1991). Because very high voltage electricity is used in ozone generation, there are associated safety hazards. Ozone production equipment however has various fail-safe protection devices which will automatically shut off the equipment when a potential hazard develops. In conventional generators, the tubular inner, high tension, electrode is covered in glass, a dielectric material. The inner electrode is mounted inside a stainless steel tube which is the outer ground electrode. Some 90 - 95% of the energy input heats the dielectric and must be removed by applying cooling water. Greater outputs have been achieved by, among other developments, adjusting the discharge gap and using alternative dielectrics such as alumina. The most common form of contactor is the bubble diffuser, comprising two or more chambers in series separated by vertical baffles. A grid of porous diffusers is mounted near floor level in the first chamber, and possibly in one or more downstream chambers, through which ozonated gas is injected. Water flows down the first chamber, counter- current to the rising gas bubbles, and then alternately up and down through subsequent chambers. The diffusers produce bubbles of 2-3 mm diameter, which provide a high interfacial area. The chambers are typically 5-6 m deep, which, by increasing pressure, assists mass transfer. Having diffuser grids in more than one chamber allows the dose to be divided, which provides dose control flexibility. Generally, no ozone is applied to the last chamber, which serves to provide reaction time; there may also be reaction-only chambers between dosed chambers. A greater ozone decay rate Water Treatment Manual: Disinfection also benefits mass transfer, but will require a higher dose to achieve a given Ct value. This type of contactor is inherently quite large, which makes it particularly suitable for disinfection applications. The volumetric gas- liquid ratio is important, because there is a reliance on the rising bubbles to provide mixing energy. If the gas- liquid ratio is too low, the bubbles will rise as discrete plumes and the water will tend to channel between the plumes, the result of which will be a decline in transfer efficiency and uneven dosing. This needs to be considered at the design stage, especially if high-concentration oxygen-fed generators are proposed. There are alternative contactor configurations, most notably turbine mixers and eductors, in which an external source of energy (the mixer or eductor pump) provides a high-shear environment in which the ozonated gas is dispersed as microbubbles, giving a very high interfacial area. Such contactors are much more compact than diffuser chambers, but have higher operating costs. For disinfection applications, there will still be a need to provide appropriate contact time. The off-gas must therefore be processed to destroy remaining ozone before being vented to the atmosphere. Thermal o destructors heat the off-gas to temperatures of up to 400 C, at which ozone decay is virtually instantaneous. Catalytic destructors have a reaction chamber filled with a material which catalyses ozone decay, avoiding the need for high temperature.
The lesions affecting the maxillofacial region (perioral kamagra chewable 100 mg for sale, jaws and face) are also considered here but for a more detail a relevant text book or manual need to be referred buy discount kamagra chewable 100 mg on-line. The clinician should be able tqo identify conditions requiring immediate attention by the dentist order kamagra chewable 100mg with mastercard, do the preliminary urgent and life saving measures where possible before referring the patient to a centre with a dentist/dental surgeon buy discount kamagra chewable 100mg. There are some cases which will need the attention of a specialist dental surgeon (like oral and maxillofacial surgeon order kamagra chewable 100 mg amex, orthodontist e. Diagnostic criteria: Inflammation of the gingival which is initially seen as discrete colour and texture changes of the marginal tissues. Prevention Instructions for proper oral hygiene care Treatment Removal of accumulated plaque and oral hygiene instructions on tooth brushing and other adjuvant means of oral hygiene (dental flossing, use of mouth washes) 1. The damage of the periodontal membrane, periodontal ligaments and eventually alveolar bone leads to formation of pockets which eventually favours more bacterial growth. Note: Tetracycline should not be given to pregnant and lactating mothers to avoid tetracycline stains in for their babies. Patients usually present with soreness and bleeding of the gums and foul test (fetor-ex ore). Contact stomatitis (a counterpart of contact dermatitis) also can occur due to allergy. Choline salycilate, Benzalkonium chloride and Lignocaine hydrochloride) Note: Mouth washes should not be used at the same time with the gel. Start slowly with white spots later developing to black/brown spot and cavities in enamel, dentine and eventually the pulp. Dental caries is caused by bacteria of the dental plaque which feed on sugary food substrates producing acid as by-products which dissolve the minerals of the tooth surface. Note: The Susceptible sites are those areas where plaque accumulation can occur and be hidden to escape active and passive cleansing mechanisms e. Prevention Proper instruction to avoid frequent use of sugary foods and drinks Use fluoridated toothpaste to brush teeth at least once a day Non-pharmacological measures Early lesions presenting as a spot on enamel without cavitation and softening, observe and adhering to preventive measures. The condition may be acute and diffuse or chronic with fistula or localized and circumscribed. Adult: Paracetamol (O) 500mg – 1g, 4-6 hourly for 3 days, Child: Paracetamol (O) 10-15 mg/kg 4-6 hourly For anterior teeth (incisors, canine and premolars: Extraction is carried out only when root canal treatment is not possible. Give antibiotics: Adult A: Amoxicillin (O) 500mg, 8 hourly for 5-7 days; Children, Amoxicillin (O) 25 mg/kg in 3 divided doses for 5 days. Plus A: Metronidazole (O); Adult 400mg 8 hourly for 5-7 days 21 | P a g e Children 7-10 years, 100mg every 8 hour Note: Periodontal abscess is located in the coronal aspect of the supporting bone associated with a periodontal pocket. Diagnostic criteria Severe painful socket 2-4 days after tooth extraction Fever Necrotic blood clot in the socket Swollen gingiva around the socket Sometimes there may be lymphodenopathy and trismus (Inability to open the mouth) Treatment Under local anesthesia with Lignocaine 2% socket debridement and irrigation with nd rd Hydrogen peroxide 3%. The procedure of irrigation is repeated the 2 and 3 day and th where necessary can be extended to 4 day if pain persists. The condition is very painful and it defers from infected socket by lack of clot and its severity of pain. Diagnosis Severe pain 2-4 days post-extraction Pain exacerbated by entry of air on the site Socket devoid of clot It is surrounded by inflamed gingiva Treatment 22 | P a g e Treatment is under local anesthesia with Lignocaine 2% socket debridement and irrigation of nd rd hydrogen peroxide 3%. The procedure of irrigation is repeated the 2 and 3 day and where th necessary can be extended to 4 day if pain persists. Aerobic Gram positive cocci and anaerobic Gram negative rods predominate among others. The predominant species include; Bacteroides, Fusobacterium, Peptococcus, Peptostreptococcus and Streptococcus viridians. Diagnosis Fever and chills Throbbing pain of the offending tooth Swelling of the gingiva and sounding tissues Pus discharge around the gingiva of affected tooth/teeth Trismus (Inability to open the mouth) Regional lymphnodes enlargement and tender Aspiration of pus for frank abscess Investigations: Pus for Grams stain, culture and sensitivity and where necessary, perform full blood count. Treatment Preliminaries Determine the severity of the infection Evaluate the status of the patient’s host defence mechanism Determine the need of referral to dentist/oral surgeon early enough Non-pharmacological Incision and drainage and irrigation (irrigation and dressing is repeated daily) Irrigation is done with 3% hydrogen peroxide followed by rinse with normal saline. Criteria for referral Rapidly progressive infection Difficulty in breathing Difficulty swallowing Fascia space involvement Elevated body temperature [greater than 39 C) Severe jaw trismus/failure to open the mouth (less than 10mm) Toxic appearance Compromised host defenses 3. It is an extension of infection from mandibular molar teeth into the floor of the mouth covering the submandibualr spaces bilaterally sublingual and submental spaces. Diagnosis Brawny induration Tissues are swollen, board like and not pit and no fluctuance Respiratory distress Dysphagia Tissues may become gangrenous with a peculiar lifeless appearance on cutting Three fascia spaces are involved bilaterally (submandibular, submental and sublingual) Treatment Non-Pharmacological Quick assessment of airway 24 | P a g e Incision and drainage is done (even in absence of pus) to relieve the pressure and allow irrigation.
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