PubMed Health⌕ Search

Biomedical subjects

H L Obwegeser

Publications and source records attributed to H L Obwegeser.

At least 19 recordsLinked to original sources
PubMed1988

Variations of a standard approach for correction of the bird-face deformity.

Variations of a standard operation technique for the correction of the bird-face deformity on the basis of fundamental planning principles are described. The main principle is the lengthening of the mandibular base in the retromolar and mental regions. The preconditions for the feasibility of this procedure are: appropriate tooth extraction and retropositioning of the lower anterior segment in spite of a seemingly good preoperative occlusion. The correction planning must, in addition to the mandible, also consider the maxilla. The asymmetrical bird-face deformity is also corrected in one operation but it is first made symmetrical to facilitate its correction. Case illustrations with corresponding operation drawings demonstrate the variation possibilities of the surgical technique as adapted to particular cases.

Adolescent↗
PubMed1987

Two ways to correct bird-face deformity.

Two different ways of correcting micromandibularism inherent in the bird-face deformity have been described. Both procedures may be applied to correct the symmetric or the asymmetric types of bird-face deformity. Both have the elongation in the front area by means of one- or two-step advancement genioplasty in common. The difference between the two procedures lies mainly in the way the elongation of the mandibular body is achieved. Procedure 2 advocates the elongation of the mandible by means of vertical osteotomy within the tooth-bearing area, and procedure 1 advocates the elongation of the mandible behind the tooth-bearing area by means of the extended sagittal split osteotomy. Both procedures are demonstrated by drawings and by cases of patients who have been operated on.

Chin↗
PubMed1987

Findings of mandibular movement and the position of the mandibular condyles during maximal mouth opening.

An investigation with respect to position of the mandibular condyles in relation to maximal vertical mouth opening was undertaken. For this purpose, 51 subjects of different nationalities were examined. None of the 51 persons had a TMJ disorder. The mobility of the mandible in different directions was clinically measured. With the use of two different reference lines (Methods A and B), the amount of the movement of the condyle from closed to maximal mouth opening position was measured in the sagittal plane on lateral tomograms. All of the measurements were recorded, and the means, SD, and range of variation were calculated. Statistical analysis was subsequently performed. The clinical results are comparable to those of other previous clinical studies. As seen in the lateral tomograms, the condyle in 41 out of 51 subjects moved beyond the articular eminence during maximal mouth opening. It was occasionally situated higher than the eminence. In only ten subjects, the condyle reached only the top of the articular eminence during maximal mouth opening. A moderate degree of dependency and correlation was found between maximal vertical movement of the mandible and the amount of movement of the right and left condyles from closed to maximal open position of the mouth, as seen in tomograms. None of our subjects had any sign of luxation despite the position of the condyle beyond the articular eminence with maximal mouth opening. Therefore, the diagnosis of condylar luxation cannot be established by radiologic investigation alone.

Adolescent↗
PubMed1986

Profile planning based on alterations in the positions of the bases of the facial thirds.

To analyze the profile properly, the size and position of the bases of the facial thirds must be known. In this study an average face was created by standard cephalometrics. The bases of the facial thirds were then moved in the horizontal or vertical direction, and the soft tissue profile was drawn to correspond to the skeletal changes. The results show how underlying skeletal abnormalities influence the profile. The terms used to describe the size and position of the bases serve as an aid in profile planning.

Cephalometry↗
PubMed1986

Hemimandibular hyperplasia--hemimandibular elongation.

Clinical and radiographic experience as well as histological findings leave no doubt that the term "condylar hyperplasia" refers only to hyperplasia of the condyle alone and should therefore not be used to mean the two hemimandibular anomalies as is the case in the literature today. There are two basically different malformations of one side of the mandible which we call hemimandibular hyperplasia and hemimandibular elongation respectively. We are convinced that there exist pure and mixed forms of both growth anomalies because we have observed several such clinical cases. The stimulus for the abnormal growth either lies within the fibrocartilaginous layer or is produced by it. Different histological patterns within the condylar growth zone were seen in the two anomalies. The pathophysiological bases of the abnormal growth are discussed. They seem to contribute to the understanding of the normal and abnormal mandibular growth and consequently also of many of the mandibular anomalies. The explanations are demonstrated by the illustrations of some cases.

Adolescent↗
PubMed1986

[Temporal bone approach to the retromaxillary-infracranial space and the orbit in tumor surgery].

The article gives a detailed description of a temporal approach to the retromaxillary infracranial space and to the orbit, developed by one of the co-authors (H. Obwegeser) of this article. Case reports show the broad spectrum of indication in surgery of benign, and especially of malignant, tumours in this region. Surgery is performed via an extended type of incision in the scalp. The cheekbone and the coronoid process, or the upper portion of the ascending ramus of the lower jaw, can be osteotomized and transposed as muscular flaps. The great advantages of this surgical procedure are an excellent overview, absence of visible scarification, and preservation of all tumour-free parts of the facial skeleton, combined with the possibility of radical en-bloc removal of the neoplasm.

Adult↗
PubMed1978

Experiences with intra-oral partial resection and simultaneous reconstruction in cases of mandibular osteomyelitis.

A review of the surgical treatment of 17 cases of mandibular osteomyelitis is presented in which, following certain special indications, resection and simultaneous reconstruction of parts of the mandible were performed. This treatment was successful in 15 of the 17 patients considered. In two cases, the necrotic graft had to be removed. In one of them, the immediate reconstruction was successfully repeated. The indications for immediate reconstruction are given and the principles of the procedure described.

Adolescent↗
PubMed1978

Facial duplication -- the unique case of Antonio.

A case of facial duplication with its surgical correction in childhood and the consequences on facial growth is reported. It is a unique case in the duration of observation. The following structures were fully duplicated: the nose, the premaxilla, the cribriform plate, the crista galli. In addition there was an enormous facial cleft including lip, alveolus and palate. Additionally there were two rudimentary eye sockets, eyes, and two supplementary eyebrows. The monstrous hypertelorism with the facial duplication was corrected at the age of ten. The surgical procedure is described and the postoperative complications are discussed. Gross lack of growth of the middle third of the facial skeleton was observed. This was probably the consequence of the initial corrective surgery. Overgrowth of the mandible created a gorilla-like appearance by the end of the growth period. This was corrected in one operation by advancement of the middle third in three sections and repositioning of the mandible as a whole together with the mandibular anterior alveolar segment. Finally all parts of the lower half of the nose had to be enlarged, both soft tissues as well as the cartilaginous framework. A pharyngoplasty in addition to the correction of the intermaxillary abnormalities did much to improve the speech quality of the patient. A large secondary cranial defect was successfully reconstructed with the use of 14 halved ribs. In spite of the removal of four ribs from one side and three ribs from the other, there were no postoperative respiratory problems. Spontaneous rib regeneration was found where ribs had been removed one year earlier.

Adolescent↗