An Overview of the Surgical Correction of Dentofacial Deformity.

The correction of severe dentofacial discrepancies involving a combination of orthodontic and surgical therapies (termed 'orthognathic treatment') is commonplace. There is an abundance of evidence within this field but it is often inconsistent. This article is an evidence-based overview of such treatments and is aimed at the general dental practitioner. It will cover: the timing of treatment; the indications and risks associated with different surgical osteotomies; the magnitude of surgical movements that can be achieved with these procedures; and the importance of mandibular autorotation when planning treatment. Orthognathic treatment is considered to be the gold standard for comprehensive correction of severe dentofacial discrepancies. It is undertaken by a multidisciplinary team of clinicians involving, but not exclusive to, consultants in orthodontics and oral and maxillofacial surgery in secondary and tertiary medical centres throughout the United Kingdom. Clinical relevance: It is imperative that general dental practitioners have a good understanding of orthognathic treatment in order to recognize when such treatments are indicated, to inform the patient of possible treatment modalities and to be able to discuss associated risks in order to make appropriate referrals. Since treatment timing and magnitude of surgical movements have a profound effect on stability of the treatment result, these must be carefully considered by all clinicians involved in patient care to minimize relapse potential.

Efficacy of desensitizing dentifrices to occlude dentinal tubules.

Dentine hypersensitivity occurs when patent dentinal tubules are subjected to external stimuli, with pain being reduced by products that occlude tubules. This study compared the efficacy of a recently developed arginine-containing dentifrice, two established strontium-based products, and a fluoride control to occlude tubules when subjected to acid challenge. Dentine specimens with patent tubules were divided into four groups that were treated with a slurry consisting of one of the pastes mixed with stimulated human saliva. Treated specimens were further subdivided and soaked in 0.3% citric acid for 10 s, 30 s, 2 min, 5 min or 10 min. Tubule occlusion on representative scanning electron microscopy images was scored by blind review. All three desensitizing pastes offered good tubule occlusion, which was maintained to varying degrees following acidic challenge. After immersion in acid for 10 and 30 s, the strontium acetate- and arginine-containing pastes almost fully occluded tubules, but only the strontium acetate paste retained this level of occlusion after immersion in acid for 2 min, with strong statistical evidence that this paste occluded more tubules than the other pastes after immersion in acid for 2 or 5 min. This suggests that strontium acetate pastes may be the most effective at reducing dentine hypersensitivity.

How consultants, hospitals, trusts and deaneries affect pre-registration house officer posts: a multilevel model.

OBJECTIVE: To examine variation in reported quality and working conditions of pre-registration house officer (PRHO) posts. To use multilevel modelling to determine how much of the variation was due to the effects of consultant firms, hospitals, trusts and deaneries, as well as variation at the level of the individual doctor. DESIGN: Questionnaire survey of national sample of PRHOs at the end of the pre-registration year. Multilevel modelling was carried out using MLwiN. SETTING: PRHOs working in UK approved medical and surgical posts in NHS hospitals from August 1996 to January 1999. PARTICIPANTS: One thousand, four-hundred and thirty-five PRHOs who had previously been part of an extended cohort study of medical student selection and training. They reported on a total of 4926 posts, on 2721 identifiable consultant firms, in 336 hospitals, in 264 trusts and in 17 deaneries. MAIN OUTCOME MEASURES: PRHOs' perceptions of the overall quality of all PRHO posts they had worked in, and working conditions in the current post. RESULTS: Twenty percent of PRHO posts were described as excellent and 34% as very good, through to 6% reported as not very good, poor or bad. The overall rating of the post showed highly significant variation at the level of hospital/trust, and consultant firm. Other aspects of posts, such as working conditions showed variation at the level of deanery, trust, hospital and firms, with different patterns for the different measures. Assessments of stress in PRHOs (GHQ, burnout, response to uncertainty), and a desire to leave medicine, showed no variation at the level of deanery, trust, hospital or firm. CONCLUSION: Some aspects of a PRHO post, in particular overall rated quality, but also many aspects of working conditions, show substantial variation at the level of hospital, trust and consultant firm, suggesting that differences reflect local variation in working practices and treatment of PRHOs, with the possibility of change and improvement. The lack of any variation at the level of deanery, trust, hospital or firm in stress of PRHOs suggests that these responses are idiosyncratic, individual responses by doctors themselves, rather than a general characteristic of posts, hospitals, trusts or deaneries.