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A dental hygienist is a licensed dental professional who is registered with a dental association or regulatory body within their country of practice. They are a primary healthcare professional who works independent of, or alongside dentists and other dental professionals in a team to provide full oral health care. They have the training and education that focus and specialise in the prevention and treatment of oral disease. They can choose to work in a range of dental settings from independent practice, private practice, specialists practices to public sector; and can also work in residential aged care facilities.
Dental hygienists have a specific scope of clinical procedures they provide to their patients. They assess a patients condition in order to offer patient-specific preventative and educational services to promote and maintain good oral health. The use of therapeutic methods assists their patients in controlling oral disease, while providing tailored treatment plans that emphasize the importance of behavioral changes . In most jurisdictions, hygienists work for a dentist or dental specialist, and some are licensed to administer local anesthesia and perform dental radiography. The major role of a dental hygienist is to perform periodontal therapy which includes things such periodontal charting, periodontal debridement (scaling and root planing), prophylaxis (cleaning) for patients with periodontal disease. In addition dental hygienists are able to perform examinations, make diagnosis, take intraoral radiographs, dental sealants, administer fluoride, and provide patient specific oral hygiene instruction. They are also able to work at an orthodontic clinic and can perform many tasks there. Such as selecting and sizing of orthodontic bands for dental braces, the removal of orthodontic appliances and are able to make dental impressions for the construction of study casts and mouthguards.
Dental hygienists work together with other dental professionals, with a higher number working at general practices with dentists, Dental therapists and oral health therapists. A smaller number work at specialist practices alongside orthodontists and periodontists. They help with the contribution of an interdisciplinary approach, aiming to provide optimum oral health care to their patients. Dental hygienists also aim to work interprofessionally to provide holistic oral health care in the best interest of their patient. Dental hygienists also offer expertise in their field and can provide a dental hygiene diagnosis, which is an integral component of the comprehensive dental diagnosis.
Other areas that relate to dentistry that dental hygienists can be involved in are:
• Research: They can carry out clinical studies and trials alongside specialists in teaching institutions.
• Professional Education: They are able to provide education by teaching and training dental hygiene students and dental assistants. They can also choose to present research at a variety of different events and seminars within their industry.
• Community health: They provide assistance and group talks in community dental clinics, residential care, hospitals and nursing homes. For example: helping clients that suffer from medical and mental disorders.
• Australian Defence Force: They are able to provide dental services with the Army, Navy and Air.
• Marketing and Sales: They can promote dental products and services through dental companies as a dental company representative.
Periodontal therapy is a continuous cycle requiring regular evaluation and maintenance to optimise treatment outcomes. The treatment is normally carried out by a Dental Hygienist or Oral Health Therapist, but involves all members of the dental team and can include specialists throughout the course of care. There are six phases undertaken by dental professionals when undertaking periodontal therapy, which are as follows;
This includes, but is not limited to;
Non-surgical periodontal therapy is concerned primarily with disease prevention, and is accomplished through patient and clinician cooperative interaction. It is normally accomplished with the incorporation of patient education and motivational interviewing, and if appropriate may include discussions regarding nutrition and/ or smoking cessation. The various treatments involved in this phase include;
If disease is present, secondary prevention may be necessary, the cause of disease should be identified and noted, and the relevant professional movement should be identified and patient instruction for dental plaque control established in an attempt to reinstate a healthy oral condition. Therefore, mechanical and chemical plaque control are involved in this phase. This may be via;
This phase is continuous throughout treatment, allowing the dental professional along with the patient to monitor the patients oral health status and assists in recognising the need for change/ amendment to the previously formulated treatment plan, according to the patients specific needs. Treatment is monitored using accurate periodontal charting and clinical observation of hard and soft tissues by the dental professional. The results of the periodontal charting and clinical observation dictates what follows the non-surgical periodontal phase. The three generalised outcomes that may result are essentially;
The corrective phase is not needed for all patients, but is dictated by the outcomes of the re-evaluation phase, encompassing all indicated;
As with the Corrective Phase, Supportive Periodontal Therapy is not needed for all patients, but is too dictated by the outcomes of the re-evaluation phase. It includes all required;
A re-evaluation of the overall response to treatment should be conducted at the end of this phase before continuing onto the Maintenance Phase.
The Maintenance Phase involves continuous care, at patient specific levels. It includes all measures used by the dental team and patient to stop the disease reoccurring, with the objective of keeping the dentition functioning for was long as possible in the oral cavity.
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Dental hygienists in Australia must be graduates from a dental hygiene program, with either an advanced diploma (TAFE), associate degree, or more commonly a bachelor's degree from a dental hygiene school that is accredited by the Australian Dental Council (ADC).
In Australia it is a legal requirement for dental hygienists/ oral health therapist graduates to be registered with the Dental Board of Australia before practising their scope in periodontology in any state or territory in Australia.
The Dental Hygienists’ Association of Australia (DHAA) Inc., established in 1975, is the peak body representing registered dental hygiene service providers in Australia. A dental hygienist does not need to be employed by a dentist but can independently assess patients and make treatment plans within their scope of practice whilst working in the community. Practising as an autonomous decision maker, and working within the scope of only what they are "formally" trained in. The National Law requires the same level of professional responsibility from dental hygienists, oral health therapists and dental therapists as it does from dentists, dental specialists and dental prosthetists in that all practitioners must have their own professional indemnity insurance and radiation licences. They are also required to complete 60 hours of mandatory continuing professional development in a three year cycle.
A Bachelor of Oral Health is the most common degree program. Students entering a bachelor's degree program are required to have a high school diploma or equivalent. Most Bachelor of Oral Health programs now qualify students as both Dental Hygienists and Dental Therapists, collectively known as Oral Health Therapist.
Dental hygienists in Canada must have completed a diploma program, this can be 19 months to 3 years. All dental hygiene students must pass a NDHCB (NDHCB) examination after graduation. This examination is offered three times per year, January, May and September. Three universities in Canada offer Bachelor of Science degrees in Dental Hygiene: Dalhousie University, University of Alberta, University of British Columbia.
Dental hygiene across Canada is a well-respected career with many opportunities. These possibilities include working in clinical, administration, education, research and public health positions. The wages vary throughout the country; from approximately $32 per hour in some areas to as high as $55 per hour in others. A surplus of new dental hygiene graduates in recent years has resulted in a decrease in wages in some regions.
Some of the downfalls to practicing in different provinces are the different regulations. For instance, in BC, the hygienist cannot provide treatment without the patient receiving a dental exam in the previous 365 days unless the practicing hygienist has an extended duty module (resident-care module). In AB, BC, MB and SK, hygienists also administer local anesthesia if qualified to do so. In Ontario, dental hygienists may take further training to become a restorative dental hygienist. Registered dental hygienists must register every year by December 31. Ontario dental hygienists must also prove continuing competence by maintaining a professional portfolio yearly. In Ontario, dental hygienists are registered with the College of Dental Hygienists of Ontario (CDHO). 
Dental hygienists in BC, ON, NS and AB are able to open their own private clinics and practice without a dentist on staff.
Since 2006, New Zealand Dental Hygienists are trained exclusively at either University of Otago in Dunedin (at the country's only Dental School), or AUT University in Auckland. The qualificiation (Bachelor of Oral Health at Otago, Bachelor of Health Science in Oral Health at AUT) enables graduates to register and practise as both a Dental Hygienist and Dental Therapist.
Prior to this, Dental Hygienists were first domestically trained in 1974 for use in the New Zealand Defence Force. The one-year course was taught by the Royal New Zealand Dental Corp at the Burnham army base outside Christchurch. Hygiene training was briefly offered at the Wellington School for Dental Nurses in 1990 as 2 week a suppliment to Dental Therapy students training. However, this was quickly discontinued.
The first independent non-military training began in 1994. Otago Polytechnic began offering a 15 month Certificate in Dental Hygiene in Dunedin. In 1998, the programme was modified to be a 2 year Diploma. Otago Polytech stopped offering the course in 2000. The following year, University of Otago began offering a 2 year Diploma in Dental Hygiene qualification. In 2002, the university added a 3 year Bachelor of Health Sciences (endorsed in Dental Hygiene) degree alongside the Diploma. This course was discontinued in 2007, when the current 3 year Bachelor of Oral Health commenced.
In order to practise, all Hygienists must annually register with the Dental Council. For the 2014-2015 cycle, the cost of this is $669.07. One Hygienist is represented on the Council for a three-year term.
Dental Hygienists can become members of the New Zealand Dental Hygienists' Association. The association was founded in 1993, and is affiliated with the International Federation of Dental Hygienists.
Dental hygienists in the United States must be graduates from a dental hygiene program, with either an associate degree (most common), a certificate, a bachelor's degree or a master's degree from a dental hygienist school that is accredited by the American Dental Association (ADA).
All dental hygienists in the United States must be licensed by the state in which they practice, after completing a minimum of two years of school and passing a written board as well as a clinical board exam. State requirements vary by state, and are controlled by state dental boards.
Dental hygienists school programs usually require both general education courses and courses specific to the field of dental hygiene. General education courses important to dental hygiene degrees include college level algebra, biology, and chemistry. Courses specific to dental hygiene may include anatomy, oral anatomy, materials science, pharmacology, radiography, periodontology, nutrition, and clinical skills.
A Bachelor's of Science in Dental Hygiene is typically a four-year program. Students entering a bachelor's degree program are required to have a high school diploma or equivalent, but many dental hygienists with an associate's degree or certification enter the bachelor's degree programs to expand their clinical expertise and help advance their careers.
Graduate degrees in the field of dental hygiene are typically two-year programs and are completed after the bachelor's degree. Common graduate courses in dental hygiene include Healthcare Management, Lab Instruction, and Clinical Instruction.
After completing one of the more than 200 accredited dental hygiene programs in the United States, dental hygienists must be licensed in the state in which they work. Licensure requirements for becoming a Registered Dental Hygienist (RDH) vary from state to state, but most require a two-year degree, a written examination, and a clinical examination. The National Board Dental Hygiene Examination is intended to fulfill the written examination requirements. The clinical examination is typically administered by the state licensing board.
The dental hygienists in select parts of North America can provide dental hygiene treatment based on the assessment of a patient’s needs without the authorization of a dentist, treat the patient in absence of a dentist, and also maintain a provider-patient relationship.
2012 - New bylaws offers an exemption from the 365-day rule if hygienists are registered in the Full Registration (365 Day Rule Exempt) class.
2006 - Dental hygienists are able to offer their services in many practice settings including independent practice.
2007 - Registered dental hygienists in Ontario who have been approved by the College of Dental Hygienists of Ontario can practice independently.
1998 - Registered Dental Hygienist in Alternative Practice (RDHAP): RDHAPs may provide services for homebound persons or at residential facilities, schools, institutions and in dental health professional shortage areas without the supervision of a dentist. RDHAPs can provide patient care for up to 18 months and longer if the patient obtains a prescription for additional oral treatment from a dentist or physician .
1987 - Unsupervised Practice: Hygienists may have their own dental hygiene practice; there are no requirement for the authorization or supervision of a dentist for most services. 
1999 - Public Health Dental Hygienist: Dental hygienists may practice without supervision in institutions, public health facilities, group homes, and schools as long as they have two years of work experience.
2008 - Independent Practice Dental Hygienist: A dental hygienist licensed with an independent practice may work without the supervision of a dentist, providing that the dental hygienist has to complete 2,000 work hours of clinical practice during the two years prior to applying for an independent license, as well as a bachelor's degree from a CODA accredited dental hygiene program or complete 6,000 work hours of clinical practice during the six years prior to applying for an independent license, as well as an associate degree from a CODA accredited dental hygiene program. 
2005 - PA 161 Dental Hygienist: Hygienists with grantee status can work in a public or nonprofit environment, a school or nursing home that administers dental care to a low-income population. Dentists collaborating with dental hygienists do not need to be present to authorize or administer treatment. However, dental hygienists must have the availability to communicate with a dentist in order to review patient records and establish emergency protocols. Hygienists need to apply to the state department of community health for grantee status.
1984 - Unsupervised Practice: Dental hygienist practice without the supervision of a dentist is allowed in hospitals, group homes, nursing homes, home health agencies, Health and Human Service state institutions, jails, and public health facilities as long as the hygienist refers their patients to a dentist for treatment. Hygienist must have at least two years of work experience within the last 5 years.
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