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Biomedical subjects

D R Poulton

Publications and source records attributed to D R Poulton.

At least 19 recordsLinked to original sources
PubMed1990

Evaluation of rare earth intensifying screens in cephalometric radiography.

Accuracy of cephalometric landmark location was determined in 20 pairs of headfilms, measuring differences in 18 points in two planes of each, using five independent observers. Each pair had one film taken with a conventional (calcium tungstate) intensifying screen system and one taken with a rare earth system. Statistically significant differences in accuracy were found in only six of the 36 measurements. Three of the differences favored the accuracy of the rare earth system (Pogonion Y, S Pogonion X and Y), while the other three favored the conventional system (ANS-X, Nasion-Y, Pt.A-Y). The least reproducible point in both systems in the horizontal axis was condylion. Since these findings showed no landmark accuracy preference of one screen system over the other, the 96 percent reduction in patient radiation with the rare earth system would mandate this be used in cephalometric radiography.

Calcium Compounds↗
PubMed1985

Increase in mandibular and chin projection with orthognathic surgery.

Three groups of twelve patients, each of whom had a Class II, Division 1 malocclusion with a markedly convex facial profile and steep mandibular plane, were treated by orthodontic means and orthognathic surgery. One group had mandibular advancement, another had maxillary elevation, and the third had both surgical procedures combined, with genioplasties performed in some cases from each group. Changes were studied with the aid of lateral cephalometric headfilms taken just after surgery and from 5 to 105 months later. Horizontal changes in point B and pogonion after the follow-up period were 7.0 mm and 8.5 mm with mandibular surgery, 5.4 mm and 9.3 mm with maxillary surgery, and 10.7 mm and 16.4 mm with combined surgery. The amount of change is much larger than found with orthodontic or orthopedic treatment alone and makes possible the successful treatment of very difficult problems.

Adolescent↗
PubMed1985

Stability of dental arch expansion in the deciduous dentition.

Thirteen patients with deciduous dentition and more than 3mm intercuspid arch length deficiency are expanded and followed, with controls, for 6 years. Arch perimeter and width at permanent cuspids and bicuspids appear to be slightly greater, and lower incisors are positioned somewhat more forward on the mandible.

Age Factors↗
PubMed1984

Identical twins with bilateral and unilateral clefts: a 20-year study.

A pair of monozygotic male twins are presented. One subject, with unilateral left complete cleft lip and palate, underwent lip surgery at 3 months and palate closure at 2 years 2 months. The second twin, with bilateral complete cleft lip and palate, underwent these operations at the same times. His lip was closed in two stages because of the severely forward positioning of the premaxilla, which was surgically set back at 4 years 9 months. Additional surgical intervention involved correction of his nose tip at 8 years 9 months. The findings suggest that surgical intervention of repositioning of the premaxilla in the bilateral cleft twin may have been responsible for the underdeveloped middle third of his face and also for the much shorter anterior lower facial height. In spite of these, this twin presents acceptable final facial and dental results.

Adolescent↗
PubMed1976

Surgical orthodontics: maxillary procedures.

The greatly increased use of maxillary surgery in the last five years has widened the possibilities for correction of dentofacial deformities. The best result in occlusion and esthetics in each situation is the goal that the orthodontist and oral surgeon must keep in mind: working together. While unfortunate side effects can occur, the experience of teams using well-managed orthognathic surgical methods shows a very good success record. The indications and treatment procedures for anterior, posterior and total maxillary osteotomies were discussed. Some of the conditions which can be well-treated are maxillary protrusion and retrusion, anterior deep and open bites, lip imbalance due to dental protrusion or excess vertical dimension, and maxillary asymmetries. The limitations of orthodontic practice without the inclusion of appropriate surgical procedures exclude real help for many of the people who need it most. We must be realistic in evaluating our achievements so that constant improvement is possible.

Adolescent↗
PubMed1974

Case report.

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Cephalometry↗