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Biomedical subjects

F J Weiland

Publications and source records attributed to F J Weiland.

11 recordsLinked to original sources
PubMed1997

Initial effects of treatment of Class II malocclusion with the Herren activator, activator-headgear combination, and Jasper Jumper.

The initial effects of treatment of Class II, Division 1 malocclusion with an activator, according to Herren (27 patients), with an activator-headgear combination (20 patients), or with the Jasper Jumper appliance (25 patients) were studied on lateral cephalograms from before and after 6 to 8 months of treatment. The patients' ages ranged from 9 to 12 years. At the end of the period of observation, the correction in overjet and molar relationship was more complete in the patients with the Jasper Jumper than in the patients with the activator. Whereas all the patients with the Jasper Jumper showed neutral occlusion, this was the case in only 20 of the 47 patients with the activator. The correction of the distal occlusion occurred through a combination of skeletal and dentoalveolar adaptations. Skeletal changes accounted for 42%, 35%, and 48% of the overjet correction by the Herren-type activator, the headgear-activator, and the Jasper Jumper, respectively. The correction of the molar relationship occurred to 55%, 46%, and 38% by skeletal changes in the respective groups. Dentoalveolar compensation (distal movement of the upper molars, mesial movement of the lower molars) appeared to be inversely related to skeletal adaptation. The patients with the Jasper Jumper showed a marked intrusion of the lower incisors with a consequent reduction in overbite.

Activator Appliances↗
PubMed1997

Secular trends in malocclusion in Austrian men.

A comparison between occlusal deviations in the permanent dentition in the skulls of 94 19th century and 157 present-day Austrian males was made by means of the PAR Index. It was found that the contemporary dentitions showed significantly higher malocclusion scores than the 19th century sample (weighted PAR Index 11.79 and 6.62, respectively). The results show that secular changes in malocclusion have occurred during the last 100 years.

Adolescent↗
PubMed1996

Goal-oriented positioning of upper second molars using the palatal intrusion technique.

This article describes an orthodontic mechanical variation to reduce prominence of the palatal cusp of the upper second molar and to correct buccal crossbites in the molar area. By using a modified transpalatal arch with a soldered spur, a button bonded to the palatal surface of the second molar, and an elastic chain intrusion of the palatal cusp with control of buccal root torque is accomplished. The palatal intrusion technique provides a simple and very efficient approach to correct upper second molar position.

Dental Stress Analysis↗
PubMed1996

Evaluation of continuous arch and segmented arch leveling techniques in adult patients--a clinical study.

The purpose of this study was to compare the efficacy of overbite correction achieved by a conventional continuous arch wire technique and the segmented arch technique as recommended by Burstone. The sample comprised 50 adult patients (age 18 to 40 years) with deep bites. Twenty-five patients were treated with a continuous arch wire technique (CAW); in the second half of the sample, the segmented arch technique (Burstone) was used for correction of the vertical malocclusion. Lateral cephalograms and plaster cast models taken before and immediately after treatment were evaluated. Statistical analysis was performed on the collected data. The results showed that both techniques produced a highly significant overbite reduction (CAW: -3.17 mm, p < 0.001; Burstone: -3.56 mm, p < 0.001). The CAW group showed an extrusion in the molar area with subsequent posterior rotation of the mandible (6occl-ML: +1.30 mm; 6occl-NSL: +1.63 mm; ML/NSL: +1.94 degrees, all p < 0.001). The Burstone group, however, showed overbite reduction by incisor intrusion without any substantial extrusion of posterior teeth (upper 1-NSL: -1.50 mm; lower 1-ML: -1.72 mm; both p < 0.001). As a consequence, no significant posterior rotation of the mandible took place (ML/NSL: +0.52 degrees, n.s.). It is concluded that in adult patients the segmented arch technique (Burstone) can be considered as being superior to a conventional continuous arch wire technique if arch leveling by incisor intrusion is indicated.

Adolescent↗
PubMed1995

Treatment of Class II malocclusions with the Jasper Jumper appliance--a preliminary report.

The effect of the Jasper Jumper appliance (American Orthodontics, Sheboygan, Wis.) on the dentofacial complex was studied in 17 consecutive growing patients who had Class II, Division 1 malocclusions. Lateral cephalograms taken before treatment and immediately after removal of the Jumpers were analyzed according to the method of Pancherz. The following results were found: (1) Class I occlusal relationships were achieved in all patients in an average treatment time of 6 months. (2) The correction of the Class II malocclusion was a result of skeletal (40%) and dental (60%) changes. (3) Skeletal Class II correction was predominantly restricted to the mandible. (4) The dentoalveolar part of total molar relationship correction took place to the same extent in both jaws, whereas in overjet correction the maxillary dental changes outweighed the mandibular changes by far. (5) When compared with normal growth changes (Bolton standards), treatment with Jasper Jumpers distalizes the upper dentition and moves the lower teeth mesially. Mandibular growth seems to be increased to some extent. It was concluded that treatment with the Jasper Jumper appliance presents an effective method to correct Class II malocclusion in growing patients.

Activator Appliances↗
PubMed1994

The role of occlusal discrepancies in the long-term stability of the mandibular arch.

To assess the influence of occlusal discrepancies on the long-term stability of orthodontic treatment, the dental casts, and cephalometric records of 40 patients were evaluated, pretreatment, post-treatment, and at least 9 years post-retention. Post-treatment and post-retention casts were mounted in a semi-adjustable articulator in RCP. In addition to arch dimension measurements, discrepancies between RCP and ICP were measured in three spatial planes using a condymeter. Arch width and length decreased significantly after retention. The position of the lower incisors was relatively stable, whereas the lower molars moved forward substantially. Lower anterior irregularity increased after treatment. As a consequence, 60% of the cases had unsatisfactory lower anterior alignment after retention. The long-term records generally showed a trend towards moderate crowding. The amount of slide decreased over time and had a statistically significant, though clinically only moderate, influence on the increase in lower anterior irregularity.

Adolescent↗
PubMed1991

[Anterior tooth intrusion with the base arch: preactivation by tip-back bending or curvature?].

Burstone's intrusion mechanics has been found to be effective in the treatment of a deep bite due to intrusion of the anterior teeth. The pre-activation of the intrusion arch by a tip-back bending shows a shortening in the activation. Measurements objectified the extent of the shortening and the resulting horizontal forces for TMA arches of a dimension of 0.017 x 0.025 inch relating to different distances between molars and anterior teeth and pre-activation by means of tip-back bending or curvature. The change of the vertical force in connection with a simulated intrusion of 5 mm was also registered. Clinical consequences of the therapy are discussed.

Cuspid↗