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Biomedical subjects

H Niederdellmann

Publications and source records attributed to H Niederdellmann.

At least 37 records · Page 2Linked to original sources
PubMed1995

[Involvement of the trigeminal nerve in fractures of the face].

It is an anatomical particularity of the trigeminal nerve that his three main branches evolve in its peripheral section via a relatively long passage up to an osseous canal. We have tried to provide, apart from a quantitative and qualitative analysis of the lesions of the trigeminal nerve in case of facial fractures, a statement as to their topography in order to enable prognosis as to such lesions. For the study, we used the data of 328 patients with a total of 468 fractures. All patients were asked to provide detailed information about any pre- and postoperative loss of sensibility in the area of the trigeminal nerve. The analysis of the research results allowed indeed for a quantitative statement, not a qualitative one, however. We were able to establish an interrelationship between the topography and a persistent lesion of the nerve for the maxilla and the mandible.

Cranial Nerve Diseases↗
PubMed1995

High-resolution SPECT of the temporomandibular joint in chronic craniofacial pain disorders: a pilot study.

Chronic craniofacial pain disorders commonly cause physicians diagnostic difficulties. The purpose of this study was, on one hand, to detect pathological focuses of the craniofacial skeleton using a new system of high-resolution single photon emission computertomography (SPECT), and on the other hand, to compare the results with those obtained via high-field magnetic resonance imaging (MRI) as far as temporomandibular joint affections are concerned. SPECT can be regarded as a supplementary diagnostic mean for patients displaying the symptoms of chronic craniofacial pain disorders, especially in cases where clinical and paraclinical investigations do not coïncide or which are refractory to treatment, not least to differentiate between somatic and psychogenic causes, respectively.

Adult↗
PubMed1994

[Indications for and pertinence of 3D tomodensitometry in panfacial fractures].

Successful treatment of panfacial fractures is dependent on precise clinical and radiological examinations. However, the complexity of fracture lines accounts for the problems and inadequacies of plain films. Three-dimensional CT-reconstruction is recommended to help the maxillofacial surgeon to conceptualize the overall injury. Subsequently, a case involving complex panfacial fractures is presented and the potential value of three-dimensional computed tomography is discussed.

Facial Bones↗
PubMed1994

[Mandibular condyle fractures: conservative treatment versus surgical treatment].

A review of medical literature on the various principles of medical care of condylar fractures confirms that the treatment is still controversial. For a long period of time, the conservative functional treatment of condylar fractures was a dominant philosophy. However, rigid internal fixation of condylar fractures is increasingly accepted as an alternative which presents an improved stability provided by the use of plate and screw fixation techniques. The purpose of this study is to compare the clinical and radiographic long-term results of patients with condylar fractures treated between 1984 and 1992 in our department. 51 patients were treated in a conservative functional way. Rigid internal fixation was performed in 25 patients using an intraoral approach, according to a technique described by Steinhäuser in 1964. The results of this retrospective analysis indicate that in fractures of the condylar head a conservative functional treatment is the therapy of choice. Fractures of the subcondylar region and also--in selected clinical circumstances--fractures of the condylar neck represent indications for a carefully executed rigid internal fixation. The intraoral approach has been proved to cause minimal morbidity and complications.

Adult↗
PubMed1994

Solitary lag screw fixation in the treatment of angle fractures in the mandible: state of the art.

The angle of the mandible forms an area of weakness and is a common site at which fractures occur. This review presents the current state of lag screw fixation of mandibular angle fractures. Treatment philosophies are discussed and the special advantages of this method are mentioned. Despite the positive results of treating angle fractures in the mandible with the solitary lag screw fixation technique, the limitations and complications are clearly pointed out in this article.

Bone Screws↗
PubMed1992

[Reconstruction of the function and shape of the middle region of the face].

The anatomical structures and biomechanical features of the middle third of the face require various methods of osteosynthesis in case of fracture. Compression osteosynthesis is mainly confined to the lateral margin of the orbits, where the transverse section of the bone is made so as to resist the force applied to attach the osteosynthetic material. If thin bone blades are fractured, as is often observed in the middle level of the face, adapting osteosynthesis is a method operating without compression. It can be regarded as the method of choice for this type of fracture.

Bone Plates↗
PubMed1991

[Treatment of dental trauma in childhood with particular consideration of splint therapy].

Injuries to the periodontium as well as to the crowns and roots of teeth are the most common results of traumatic insults in childhood. The main problem in the fixation of luxated teeth is associated with the state of dentition and the anatomy of the deciduous and permanent teeth. In a clinical follow-up examination the quality of several splints for treating luxated teeth was evaluated. We observed that some acrylic cap splints showed marked mechanical faults and poor fit. Modification of the Construction technique could eliminate such problems.

Child↗
PubMed1991

[On differential indications for endosseous implants and autologous tooth transplants for single posterior tooth loss].

A therapeutic alternative in treating the loss of single teeth, the treatment with implant-borne crowns or autologue transplantation of teeth is gaining increasing importance in clinical dentistry. Both surgical techniques were demonstrated, and the authors tried to differentiate the ranges of indications for endosseous implants and autologue transplantation of teeth.

Adult↗
PubMed1991

[Clinical aspects of implant-supported telescopic crowns in partially edentulous jaw].

First clinical experiences indicate the possibility for implant-supported cone-overdentures to be used in the treatment of partial edentulism. In situations with statically unfavorable abutment distribution or uncertain prognosis of the natural teeth, fixtures could be implanted in suitable positions and used as abutments in combination with the remaining teeth. Clinical and biomechanical aspects of implant-supported cones in the treatment of partially edentulous patients are discussed.

Crowns↗
PubMed1990

[Evaluation of the hemostyptic properties of a collagen preparation].

In vitro tests were carried out to determine whether the haemostyptic properties of a collagen monomer were lost during the manufacturing process. An increased recalcification time and thromboplastin time as well as failure of the thrombocytes to adhere to the collagen fibres were observed. This indicates that blood coagulation can be attributed only to mechanical irritation of the blood corpuscles and not to the properties of the collagen molecules.

Collagen↗
PubMed1990

[Mechanical properties of collagen or gelatine-stabilized blood clots].

Mechanical properties of blood clots stabilized with collagen (Pentapharm) and a gelatine (Gelastypt-M) sponge were compared with the help of thrombelastography and volumetric tests. The collagen songe was distinctly inferior to gelatine in stabilizing the clot against retraction. It appears that gelatine is a better material for filling large osseous defects that are subjected to mechanical stress.

Animals↗