Abstract:
OBJECTIVES:Various techniques have been suggested to enable the operator to produce an even reduction of 0.5 mm of labial tooth enamel during preparation for a porcelain veneer. For example, in addition to the traditional free hand method, longitudinal or horizontal depth orientation grooves and the use of small round burs to produce dimples as depth guides have been suggested. However, there is no published data that compares how effective these techniques are at producing the 'ideal' veneer preparation. In this study three techniques were compared using the technique of co-ordinate metrology. METHOD:A single operator using the above three techniques prepared 84 extracted teeth. Impressions of the prepared and unprepared teeth were scanned using a co-ordinate measuring machine (CMM). Measurements of maximum labial reduction along the mid-labial plane were taken and analysed. RESULTS:The study showed that among the three techniques studied the use of small round burs (D001-012), when used side on at an angle of 45 degrees to the tooth surface to produce dimples as depth guides, resulted in the greatest frequency of tooth reductions closer to the 'ideal' depth chosen for this study, ie within the 0.4 mm-0.6 mm range. CONCLUSION:The study concluded that even after using techniques designed to produce consistent preparations, a single operator still produced preparations with considerable variation from the ideal. The study showed that among the three techniques compared the use of small round burs, when used side on at an angle of 45 degrees to the tooth surface to produce dimples as depth guides, resulted in the greatest frequency of tooth reduction closer to the 'ideal' depth chosen for this study only, ie within the 0.4 mm-0.6 mm range. It is stressed that this range may not be the ideal in all clinical situations.
journal_name
Br Dent Jjournal_title
British dental journalauthors
Cherukara GP,Seymour KG,Samarawickrama DY,Zou Ldoi
10.1038/sj.bdj.4801385subject
Has Abstractpub_date
2002-04-13 00:00:00pages
401-4; discussion 392issue
7eissn
0007-0610issn
1476-5373journal_volume
192pub_type
杂志文章abstract::Career breaks occur for many reasons and may well be the pattern for the future. In a recent survey, reasons given for career breaks included personal and family sickness, childrearing, travelling and study. Childrearing was the most common reason for women to have a break and personal sickness for men. Although these...
journal_title:British dental journal
pub_type: 杂志文章
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abstract::Putting patients' interests first should always be at the forefront of a dental practitioner's mind. When treatment planning, it can be possible to lose sight of the patient: their primary concerns, ability to cope with treatment and what they regard success to be. Introducing key concepts such as a 'problem list' and...
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abstract::Paraformaldehyde is used both as a disinfectant and to devitalise inflamed pulps when local anaesthesia is ineffective. Despite the clinical benefits, paraformaldehyde is not confined to the pulp, but penetrates the dentine and is gradually released as formaldehyde. This case series describes the effects on periodonta...
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abstract::In the aftermath of the devastating tsunami that hit South East Asia last December, a huge operation to try to identify thousands of victims got underway, with the help of many overseas medical and dental professionals. British dentist Gareth Pearson went to Thailand to try and help in this task and here recounts his ...
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更新日期:1991-04-20 00:00:00
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abstract::There are certain advantages to restoring a complete arch simultaneously, however, attempting to do this requires that the dentist maintains control during all stages of treatment. Maintaining control alleviates the preassure of time, which in turn allows for precision to be obtained at all clinical and laboratory sta...
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pub_type: 历史文章,杂志文章
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更新日期:2007-11-10 00:00:00
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更新日期:1990-11-10 00:00:00
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pub_type: 杂志文章,随机对照试验
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pub_type: 临床试验,杂志文章,随机对照试验
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abstract::The incidence of head and neck cancer is on the rise. Most head and neck cancers are treated with surgery, radiotherapy, chemotherapy or a combination of these modalities. Patients undergoing radiotherapy can experience several unwanted oral side effects, which have both short and long term implications. Dental genera...
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abstract::Heroin addiction is associated with poor oral health. Oral and dental care in heroin addiction might be complicated by altered mental status, negative attitude towards oral health, dental anxiety and fear, drug interaction, and associated medical co-morbidity. We present the oral findings and discuss the dental, behav...
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abstract::The rise of the dental profession coinciding with the invention and rapid spread of photography means that there are very few paintings of dentists in action. The present article describes Sir John Lavery's unusual depiction of The Dentist (Conrad Ackner and his Patient) in which the conventions of contemporary societ...
journal_title:British dental journal
pub_type: 传,历史文章,杂志文章
doi:10.1038/sj.bdj.2011.4
更新日期:2011-01-22 00:00:00
abstract:AIM:An audit of the use of intravenous ketamine for the provision of conscious sedation in paediatric dentistry was carried out over a three-year period. AUDIT DESIGN: In the audit, 3,751 children were treated and an evaluation was carried out for safety and effectiveness of the drug and procedure, the quality of sedat...
journal_title:British dental journal
pub_type: 杂志文章
doi:10.1038/sj.bdj.2015.390
更新日期:2015-05-22 00:00:00
abstract:AIMS:The aims of this survey were to establish the demographic profile of dental hygienists (DHs) and dental hygienist/therapists (DH/Ts) in the United Kingdom in 2011 and their patterns of practice as DHs. METHODS:A 10% sample of all those registered with the General Dental Council as DHs or DH/Ts in April 2011 were ...
journal_title:British dental journal
pub_type: 杂志文章,评审
doi:10.1038/sj.bdj.2012.1041
更新日期:2012-11-01 00:00:00