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Biomedical subjects

H Niederdellmann

Publications and source records attributed to H Niederdellmann.

At least 19 recordsLinked to original sources
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↗
PubMed1989

Technical improvements in the sagittal split ramus osteotomy.

This article addresses the potential sources of morbidity associated with the sagittal split ramus osteotomy. Refinements in the instrumentation and technique are described; these enhance the exactness of the procedure, thereby minimizing the complications and improving the stability of the surgical result.

Bone Plates↗
PubMed1989

[Comparison of two operative techniques for odontogenic maxillary sinusitis].

The bone lid method introduced by Lindorf (1974) was compared with a conservative procedure leaving a small defekt in the malar buttres. The operation is partly done with an endoscope. The results of 60 operated maxillary sinuses show a higher incidence of dysesthesia and postoperative discomfort in the bone lid method. Thus this method should in our opinion be reserved to special indications.

Endoscopy↗
PubMed1989

[Integration of pyrolized bone graft material in major bone defects].

In a clinical post-treatment evaluation during the past 3 years the wound healing of bone defects after substitution with a pyrolized xenogenic bone graft was observed in 90 patients. In most cases we found that wound healing was impaired and that the material did not show any osteointegration. As a result, inflammatory reactions of the bone with loss or demarcation of the bone graft occurred. Although some authors have reported a stimulation of osteogenesis after implantation of pyrolized bone graft, we cannot confirm their view.

Alveolar Process↗
PubMed1989

[Reoperation of root amputation with titanium pin].

A clinical follow-up of 238 patients confirmed the good results of root amputation with titanium pin for apical closure. An analysis of reoperations because of failure of primary surgery rendered similarly good results. Therefore the use of a titanium pin will not impair the success of secondary surgery for root amputation which shows good results most of the time anyway.

Dental Pins↗
PubMed1989

[Insertion of collagen matrix into open bony defects].

The use of collagen as a bone substitute was examined in a clinical study involving 70 patients. In a standardized operation impacted mandibular third molars were removed simultaneously. Collagen fleece was implanted in one osseous defect while the other defect was packed with iodoform gauze. Postoperative pain, swelling and complications were analyzed. There were significant differences between the two methods. The use of collagen fleece to obturate bony defects following surgical removal of impacked molars appeared to be of no advantage. On the contrary, there was a considerably higher rate of postoperative bleeding and complications. This could probably be related to the poor stability of the implanted material.

Adult↗