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Biomedical subjects

B Neumayer

Publications and source records attributed to B Neumayer.

7 recordsLinked to original sources
PubMed1992

[Tensile strength studies of self-cutting titanium osteosynthesis screws].

The tapping screws of the Medicon Osteosynthese System applied in the jaw and facial area were checked for their mechanical sturdiness. Screwing tests with bones and aluminium were carried out. The minimum fracture moment, the moment transferrable by the screw slot and the required moment for a tight seat of the Osteosynthese plate on the bone surface were calculated. The screws and plates are of titanium alloy TiA16V4 (US standard) for implantats. In a sample taken at random of test screws the fracture moments were measured and examined. All the screws support considerable loads and the fracture moments are almost 20% higher that the minimum fracture moment for TiA16V4 screws specified in DIN 267, part 18.

Alloys↗
PubMed1991

[Automation for the orthodontics model analysis using a digital caliper].

1. The discussed program structure is a common one and is transferable to other computer systems. 2. The structure is independent from computer language and thus is usable with various computer languages. 3. This proposal for automation is helpful in treatment planning but it cannot substitute the orthodontists diagnostic work. 4. Because of the modular structure the program can be used for daily practice as well as for extensive scientific works. 5. The program can be included totally or partly in other programs and used as an integral part of existing programs.

Cephalometry↗
PubMed1989

[Torque measurement of self-threading bone screws. Test procedure for new surgical screws].

Different systems of self-cutting screws are tested by a measuring instrument to test the torsional strain. Modern methods of measuring techniques are applied to get results of the torsional force and the torque by screwing into the bones. To get a self-cutting screw system several methods of biomechanical properties must be applied. A variety of quality tests, of biomechanical screws, are used, before performing the operations, that flaws may be detected.

Bone Screws↗
PubMedDate not supplied

[Optimizing titanium osteosynthesis miniplates. Some basic considerations].

Most recently there seems to be a general turning away from the use of rectangular osteosynthesis miniplates in the treatment of maxillofacial fractures and in plastic surgery. Meanwhile a novel design based on circular arcs and connecting bars has been successfully employed. Its particular two-dimensional shape allows three-dimensional deformation without damaging the plates or the openings required for screw insertion. Apart from a reduced plate-bearing area and an increased torsional stability during adaptation to the bone surface, this new plate geometry and the complete system excells by its high tissue compatibility. This later characteristic is attributable to the choice of the bioinert material titanium, which has been processed into a special alloy.

Bone Plates↗
PubMedDate not supplied

[Basic geometrical principles of profile harmony as an aid in planning and simulating maxillofacial surgery].

Dividing the facial profile into three sectors according to the principle of the golden section with one circle around the auditory meatus as the center provides a basis for a harmonic profile. An additional important factor for the general harmony of the profile is the nose. Based on a great number of measurements, computer programs allow preoperative profile simulations and the assessment of surgical feasibility. As numbers and the resulting numerical relationships play a fundamental role in the classification of the human body, it is possible to express beauty in terms of geometry. It is, however, only at certain definite numerical relationships of these three facial sectors to each other that a harmonic profile of the human head is produced. The resulting constructive ideals of beauty provide aids and guidelines in plastic surgery.

Cephalometry↗
PubMedDate not supplied

[Comparative studies on stability of titanium and V4A osteosynthesis screws].

Three years of clinical use and testing provided clear support to the advantages of the self-tapping titanium splithole screws. Although having rather flat heads these screws afford a fast grip with the screw driver blade. In addition to this, the pin offers good axial guidance and adhesion of the screw. The cylindrical design of the screw equator improves the fit of the screw in the chuck of the screw driver. The spherical shape of the lower half of the screw head increases the circular contact to the osteosynthesis plate, which is particularly favorable in the case of a minor angular error.

Bone Plates↗