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Biomedical subjects

H S Orton

Publications and source records attributed to H S Orton.

11 recordsLinked to original sources
PubMed1992

The treatment of severe 'gummy' Class II division 1 malocclusion using the maxillary intrusion splint.

This paper describes a modified Maxillary Intrusion Splint (M.I.S.) system which incorporates a near vertical pull headgear, and its use in the management of severe 'gummy' Class II division 1 malocclusion. The appliance was designed to reduce the visibility and vulnerability of the maxillary incisors in this difficult clinical situation by achieving the intrusion of maxillary teeth, restraining maxillary growth, and encouraging an element of subsequent forward mandibular rotation. The authors' initial experience using this system is presented in a retrospective cephalometric analysis of the lateral skull films of 26 treated patients contrasted with a similar number of comparable controls. The results showed that the principal effects of the M.I.S. were on the maxillary teeth giving decisive overjet control and incisor retraction with actual maxillary incisor intrusion. There was a similar effect on the maxillary molar and the M.I.S. provided effective en masse vertical control of the maxillary dentition. There was some degree of maxillary restraint in the M.I.S. group, but no noticeable difference in the change of mandibular position between the groups at the end of treatment. The possible reasons for this are discussed and suggestions made to improve this aspect of treatment in these patients.

Cephalometry↗
PubMed1991

Class III malocclusion: a comparison of extraction and non-extraction techniques.

A retrospective cephalometric study was made of the hard tissue changes in a group of 90 Class III, Skeletal III children, diagnosed as suitable for treatment by orthodontic means alone. Thirty-two were treated by a combination of upper incisor proclination and headgear to an intact mandibular dentition (Group 1), while in 28 the overjet was corrected with mid-arch extractions and Edgewise mechanics (Group 2). The remaining 30 children acted as controls (Group 3). Children were initially examined as male and female subgroups, and where no significant differences were seen data were pooled. In order to standardize the results, treatment/observation effects were presented as average changes per year. The three groups were essentially comparable pretreatment. Following overjet correction, the lower incisors uprighted in both groups, with an improved relationship to the A-Po line: the upper incisors were proclined in Group 1 only. Underlying skeletal changes were restricted to the mandible, which showed a downward and backward hinging, and an increase in lower face height. The improved mandibular position was significantly greater in the non-extraction group and was accompanied by an improvement in facial convexity. In addition, treatment could be started earlier and was completed in a significantly shorter time (Table 1). It would, therefore, appear that, in the short term at least, a non-extraction/headgear approach has advantages over a standard mid-arch extraction/Edgewise technique.

Adolescent↗
PubMed1989

Criteria for approval of training programmes for senior registrars in orthodontics in the United Kingdom.

To be appointed as a consultant orthodontist in the British National Health Service requires a period of 3+ years in a higher training post as a senior registrar in orthodontics. Educational approval of these training posts is controlled by the Joint Committee for Higher Training in Dentistry. The detailed monitoring and requirements of senior registrar training posts are controlled by the Specialist Advisory Committee in Orthodontics and Paediatric Dentistry. Revised criteria for the approval of training programmes have recently been issued and are appended for the guidance of aspirant trainees, trainers and for the reader seeking an understanding of the UK title of 'Consultant Orthodontist'.

Consultants↗