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Biomedical subjects

H Droschl

Publications and source records attributed to H Droschl.

At least 37 records · Page 2Linked to original sources
PubMed1989

[Orthodontic treatment of adults].

Orthodontic treatment of adults has become an integral part of orthodontic routine. Adults can only be treated with fixed appliances. The amount of force and the resulting moments need careful calculation. The factors listed below distinguish orthodontic treatment of adults from that in juveniles: (1) Preceding periodontal treatment is a sine qua non. It should also accompy orthodontic treatment. (2) A growth effect can no longer be expected. (3) Bite opening can only be achieved by intrusion and torque of incisors. (4) Skeletal disharmonies invariably need surgical correction. (5) Treatment time is considerably longer. (6) Motivation of adult patients is much higher. (7) Therefore, oral hygiene is not a problem. (8) The cosmetic appearance is an important factor, which is best taken care of by ceramic or lingual brackets. (9) Final adjustment of occlusion should be done with gnathologic positioners. (10) Adult treatment should only be done by orthodontists trained and experienced in modern fixed appliance use.

Adult↗
PubMed1989

[Critical evaluation of the relations between onset and outcome of treatment in the management of mesial bite].

In patients with mesial bite the outcome of treatment by chin caps and/or Fränkel's functional appliance was evaluated. Of 30 patients with Angle class III anomalies pre- and posttreatment telemetric films and models were reviewed. Patient were subdivided in 2 groups: Group I with deciduous teeth on their pretreatment films (ID) and group II with permanent teeth on their pretreatment films (IP). In group I (ID) patients treatment produced more extensive skeletal modifications than in group II (IP) patients, who had shown severer abnormalities before treatment. In group I (ID), the modifications obtained by treatment appeared to be more persistent than in group II (IP). Patients in group I (ID) showed reduction of the gonion angle, shortening of the ramus, reduction of the SNB and SNPog angles and increase of the ANB angle. In group II these parameters were not substantially improved. Overbite and overjet readings were ideal in group I (ID). Signs of dental compensation were seen in both groups.

Activator Appliances↗
PubMed1989

[Fixed appliances current state of the art].

Recent advances in fixed appliances are reviewed and discussed. These include cosmetically more appealing brackets (ceramic, lingual); new wires (nickel-titanium and titanium-molybdenum alloys); new biomechanical approaches (accurate computation of forces and torques according to Burstone resulting in the use of new mechanical concepts); experiences in the treatment of transplanted teeth made in the past 15 years; new approaches to the orthodontic finish (implementation of Andrews' "six keys to normal occlusion" with straight wires, accurate positioning of brackets, and gnathological positioners). Cases will be demonstrated.

Adolescent↗
PubMed1989

[Different applications of various wire alloys in fixed appliance technic].

Steel, beta-Titanium and NiTi archwires (0.016 inch) as well as twisted steel wires (0.0175 inch) were subjected to a bending test. The results were presented graphically. Steel (Tru-Chrome), beta-Titanium (TMA), the twisted steel wires and only one NiTi wire (Nitinol) showed linear force-deflection-diagrams. The other NiTi alloys showed a curved line with a constant force in the middle part. The superelastic wires delivered the same initial force, whether 2 or 4 mm activated. The larger the deformation the longer became the range with a constant force (superelasticity). With an activation of 1 mm a conventional force deflection diagram was found. The steel wire (Tru-Chrome) showed the steepest curve, followed by TMA, Nitinol, some superelastic wires, Twistflex and Respond as well as Pentacat. The last two wires showed an identical diagram. The NiTi-alloy Sentalloy yellow was comparable to Wild Cat, Sentalloy blue to Respond. Some examples of the application of the different arch wires in patients are presented.

Alloys↗