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Biomedical subjects

D Wiechmann

Publications and source records attributed to D Wiechmann.

8 recordsLinked to original sources
PubMed2003

[Computer-assisted occlusal finishing].

The finishing of a fixed appliance case is one of the greatest challenges in our specialty and is playing an ever-increasing role in treatment considerations as patients become more demanding. The quality of the finishing is, in fact, often seen as an indicator of the orthodontist's skills. The finishing of a lingual case is subject to exceptionally exacting requirements. This often leads not only to longer chair times towards the end of the treatment but to longer treatment times overall. The procedure described in this article permits high-quality finishing with no greater clinical resource input than with conventional labial appliances. Five essential factors are presented and discussed.

Computer-Aided Design↗
PubMed2001

Incremental validation of situational judgment tests.

Using 3 different samples, the authors assessed the incremental validity of situational judgment inventories (SJIs), relative to job knowledge, cognitive ability, job experience, and conscientiousness, in the prediction of job performance. The SJI was a valid predictor in all 3 samples and incrementally so in 2 samples. Relative to the other predictors, SJI's partial correlation with performance, controlling for the other 4 predictors, was superior in most comparisons. Subgroup differences on the SJI also appear to be less than those for cognitive ability and job knowledge, but greater than differences in conscientiousness. The SJI should prove to be a valuable additional measure in the prediction of job performance, but several additional areas of research are suggested.

Adult↗
PubMed2000

Lingual orthodontics (Part 4): Economic lingual treatment (ECO-lingual therapy).

One key factor in the economic lingual treatment concept presented in this series of articles is the use of prefabricated, customized nickel titanium arch wires with superelasticity and temperature-dependent spring-back qualities (memory effect). Using a modern, e-modulus driven archwire sequence, a non-extraction case can be treated with 1 or 2 wires per arch, and an extraction case with 2 or 3 wires per arch. This article, the last in the Lingual Orthodontics series, uses clinical examples to show the various clinical potentials of these wires with temperature-dependent superelasticity, as not only part of but occasionally all the treatment is done with these prefabricated, customized nickel titanium wires.

Copper↗
PubMed2000

Lingual orthodontics (Part 3): Intraoral sandblasting and indirect bonding.

Bracket loss is a severe complication in the course of orthodontic treatment, especially when using lingual appliances. High adhesive strength between bracket and tooth is therefore an important requirement for the successful integration of lingual orthodontics into everyday practice. The present article examines the influence of intraoral sandblasting prior to etching on the adhesive strength of indirect bonding. The shear bond strength of 20 cylinders made of composite were measured 24 hours after these had been bonded onto the enamel of bovine teeth. The enamel was prepared by sandblasting (Microetcher, 50 microns Al2O3) for 3 seconds prior to bonding, followed by 30 seconds of enamel etching with 37% phosphoric acid. Twenty specimens were tested without sandblasting in the control group. The results show that intraoral sandblasting prior to etching can significantly (p < 0.001) increase the adhesive strength between enamel and bonding material. Thus intraoral sandblasting is an integral part of the indirect bonding record described in the second section of this article.

Acid Etching, Dental↗
PubMed1999

Lingual orthodontics (part 1): laboratory procedure.

A key factor for successful correction of a malocclusion with lingual orthodontics is optimal bracket positioning. This presentation focuses on the development of an innovative laboratory procedure for indirect bracket positioning using a modified positioning device (TARG Professional) called Transfer Optimized Positioning System (TOP). In contrast to commonly used approaches to indirect bonding such as CLASS and BEST, the TOP System uses a target set-up technique in order to facilitate the 3-dimensional individualized positioning of brackets while allowing the brackets to be placed on the malocclusion model. The reliability and accuracy of this system in both the laboratory and the clinical environment are discussed. This discussion highlights the high precision of the TOP System and its significance in eliminating the usage of second and third order corrective archwire bends in the finishing stage of lingual orthodontic therapy. In other words the TOP System allows for the usage of almost flat orthodontic arch wires to successfully treat a malocclusion with lingual braces. This is the key factor in enhancing the cost effectiveness and success of a lingual treatment concept.

Bicuspid↗
PubMed1999

Lingual orthodontics (part 2): archwire fabrication.

One essential component of a successful lingual treatment concept is the precise calculation and manufacture of individual lingual arch wires. As in several parts of daily life, the use of modern CAD/CAM technology leads in lingual orthodontic treatment to a rationalisation of working processes with maximized precision. The lingual module developed by the author is a new scanner-independent procedure for calculation and manufacture of individual lingual arch wires with the Orthomate/Orthotherm system (OrthoTel, Berlin/Dallas, Tx). Especially the precise individualization of superelastic, shape-memory materials reduces the archwire sequence and simplifies lingual treatment considerably. Individual second and third order overcorrections (incisal torque, reverse curve of Spee) can be programmed into the first archwire, with further three-dimensional corrections being added for each single tooth during finishing. Embedded in a systematic treatment concept, the use of modern CAD/CAM technology for individual lingual archwire production with the Orthomate/Orthotherm system is an important aid to successful integration of lingual orthodontic treatment into routine practice.

Computer-Aided Design↗
PubMed1997

[A prefabricated, calibrated double-base procedure--KDMMS. For the simulation and 3-dimensional planning using an articulator in orthognathic surgery].

A tight cooperation between the orthodontist and oral surgeon is a key factor for success in orthognathic surgery. The quality of the final result is determined a great deal by the pre-operative model-surgery. The KDMMS is a planning tool which allows, even in the most complex cases, accurate and quick model-surgery. The two main components of the KDMMS are the double base plates and the model positioning system, which resemble a "fixation extérieure". The double base plates enable the operator to reproduce the original, pre-operative situation at all times. This allows multiple set-ups for one case, three dimensional measurement and positioning of models with occlusal control can be achieved by use of the positioning system. Especially, in complex surgery cases, the KDMMS is an effective aid in three dimensional planning of orthognathic surgery.

Cephalometry↗