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Biomedical subjects

K E Kahnberg

Publications and source records attributed to K E Kahnberg.

At least 55 records · Page 3Linked to original sources
PubMed1989

15 years follow-up on condylar fractures.

The masticatory system was examined, clinically and radiographically, in 14 children, 8 teenagers and 14 adults, 15 years after conservatively treated condylar fractures. In children, no major growth disturbances were observed and in most cases, there were no signs of the earlier fracture and the function of the masticatory system was good. In teenagers, the anatomical and functional restitution of the TMJ was not as good as in the children, but hardly gave rise to objective symptoms. In the adult group, signs of dysfunction were frequently observed but were not considered serious by the patients.

Adolescent↗
PubMed1989

Intraalveolar transplantation of teeth. IV. Endodontic considerations.

Twenty-six teeth with crown-root fractures have been subjected to intraalveolar transplantation. In 13 teeth the endodontic treatment was instituted before transplantation and in another 13 teeth 3-4 weeks after transplantation. Bacteriological tests showed that endodontic treatment after transplantation was preferable with statistically fewer treatments and more reliable results. The results thus points in favour of a late endodontic treatment with controlled aseptic conditions.

Adult↗
PubMed1989

Combined use of bone grafts and Brånemark fixtures in the treatment of severely resorbed maxillae.

Bone grafts from the hip in combination with Brånemark self-tapping fixtures have been used to rehabilitate patients with extremely resorbed maxillae. Experiences and results from the first ten consecutive cases have been analyzed to form the basis for further use of the method. Eight of 57 fixtures placed have been lost to date. Surgical complications, including exposure of the bone transplant, have occurred in three patients. The method should be used with caution, and cases should be meticulously chosen to exclude those who do not have proper motivation to endure the long-lasting and demanding surgical and prosthetic procedures required. The combined use of implants and transplants should not be used routinely until a long-term evaluation of the method and results has been made.

Bone Resorption↗
PubMed1988

Recurrence of keratocysts. A long-term follow-up study.

The aim of the study was to investigate the recurrence rate of keratocysts based on a material with a follow-up of at least 5 years, and to evaluate the relationship between different features of these cysts and their recurrence. It was found that of 75 keratocysts with follow-up times ranging from 5 to 17 years (mean 8.3), 32 (43%) recurred. The cumulative recurrence rate of the 67 annually examined cysts increased from 3% after the 1st year following the operation to 37% after the 3rd year. Thereafter, no new recurrences were noted. Recurrence of keratocysts in patients with basal cell nevus syndrome occurred more frequently than that of patients without the syndrome. Keratocysts enucleated in one piece recurred significantly less often than cysts enucleated in several pieces. The recurrence rate of keratocysts with a clinically observable infection, with fistula or with a perforated bony wall was higher than that of keratocysts without these features. Recurrence was also found more frequently in cysts with multilocular radiographic appearance than in unilocular cysts. The size or the location of the keratocysts did not have an influence on the recurrence rate.

Adolescent↗
PubMed1988

Surgical treatment of the open bite deformity. Surgical correction of combined mandibular prognathism and open bite by oblique sliding osteotomy of the mandibular rami.

Treatment of open bite deformity combined with a prognathic mandible using the oblique, sliding osteotomy of the mandibular rami has been followed for 2 1/2 years to evaluate the final outcome of the operation. The clinical and radiographic examination during the control period show a remarkably stable result with a relapse magnitude the same or slightly less than that for a straight, set-back procedure. A certain dental compensation occurs during the skeletal relapse. The thought of creating a certain "freedom-space" in the muscular fibres during the set-back procedure, thus facilitating closure of the open bite is proposed. Surgical correction of the anterior open bite today is otherwise most frequently focused on solutions with maxillary le Fort I or subapical procedures to ensure minimal influence from the jaw muscles.

Cephalometry↗
PubMed1988

Combined Le Fort I osteotomy and oblique sliding osteotomy of the mandibular rami. A follow-up.

Bimaxillary surgery involving mandibular set-back and maxillary advancement has been performed on eight patients with severe prognathic mandibles and in two patients with pronounced retropositioning of the maxilla. The combined surgical approach turned out to give a very satisfying result both from the functional and aesthetic points of view. Whereas a certain skeletal horizontal relapse occurred in the mandible and a vertical one in the maxilla, the occlusal stability was maintained in all but one case. A good postoperative occlusion obviously retains the teeth in position. The soft tissue adaptation and final configuration postoperatively takes a long time, and should if possible be subjected to more sophisticated analysis before surgery. The bimaxillary approach with step-wise surgery, using an intermediate wafer is, in our opinion, a good solution to marked malpositions and in many cases preferable to single jaw surgery.

Adult↗
PubMed1988

Healing of experimental midline osteotomies in the rat palate.

An experimental study in the white rat (Sprague-Dawley) was undertaken to evaluate the frequency of fisula formation after palatal midline osteotomies as used in surgical-orthodontic "rapid-expansion" procedures. The mucosal incision was made in the palatal midline above the osteotomy region. The healing process was followed during three and six weeks in two groups of animals. In one of the groups the width of the osteotomy was one millimeter and in the other two millimeters. The frequency of fistula formation was in the larger osteotomy group higher and reached 85% after six weeks healing. The frequency of fistula formation was never less than 33%. Osteoid formation in the osteotomy region was almost nill in all cases.

Animals↗
PubMed1988

Surgical approach in severe cases of maxillonasal dysplasia (Binder's syndrome).

Binder's syndrome or maxillonasal dysplasia is a malformation characterized by an extremely flat and retruded nose. Severe cases of the syndrome do also have a retrognatic maxilla often combined with an open bite deformity which demands a combined surgical solution with both maxillary osteotomy and secondary nose correction. The two-stage surgical procedure in the advanced cases of maxillonasal dysplasia has in our opinion been preferable to a Le Fort II osteotomy. Two cases with severe Binder's syndrome where the two-stage procedure has been performed will be presented and the surgical approach discussed.

Adolescent↗
PubMed1987

Recovery of maxillary sinus and tooth sensibility after le Fort I osteotomy.

The post-operative effects of maxillary le Fort I osteotomies on tooth sensibility and recovery of maxillary sinus integrity has been studied in thirty patients. The results show that tooth sensibility is lost in over 90% of the teeth post-operatively but gradually returns by 18 months in almost all of the teeth. Radiographic examination of the maxillary sinus post-operatively shows total or almost total radiopacity in all patients whereas later controls at 2 months and 6 months show normalisation of the bony and soft tissue structures in over 55% of the patients. At 6 months some of the patients (30%) show latent mucosal borderline swelling either bilateral or unilateral. A certain remodelling of the maxillary sinus was seen in all patients.

Adult↗
PubMed1987

Accuracy of cephalometric prediction in orthognathic surgery.

The reliability of predicting the results of orthodontic surgical treatment was analysed. The sample consisted of 30 patients treated with one of the following six types of surgery: mandibular anterior alveolar surgery; maxillary anterior alveolar surgery; mandibular setback surgery; mandibular advancement surgery; Le Fort I surgery; and a combination of Le Fort I and mandibular setback surgery. Comparisons of tracings of the initial cephalometric radiographs, the prediction tracing and the six-month follow-up film showed great variation in the results both within and between the surgical subgroups. Generally, it was easier to predict the treatment results of alveolar segmental osteotomies, especially in the mandible, than of operations in which the whole mandible was repositioned. The results from Le Fort I surgery with or without a concomitant mandibular setback showed the greatest difference between the predicted and the actual outcome. The postoperative vertical dimension appeared to be particularly hard to predict. Explanations for these discrepancies are offered and possibilities for improvements suggested. It is concluded that prediction tracings are still of value despite the poor accuracy in some cases.

Adolescent↗
PubMed1987

Transposition of the mental nerve in orthognathic surgery.

Transposition of the mental nerve in association with orthognathic surgery was performed 25 times in 16 patients. Indications for transposition generally were use of the premolar region for surgical correction of anterior open bite or dentoalveolar prognathism. In one case, reduction of the mandibular base was the surgical indication. Postoperative hypesthesia occurred in 16 mental nerves but sensibility gradually returned to normal in almost all the patients at between six and 18 months. Partial nerve damage occurred accidentally in three cases with reduced sensibility at follow-up.

Adult↗
PubMed1987

Autotransplantation of teeth (I). Indications for transplantation with a follow-up of 51 cases.

The indications for autotransplantation of teeth in 45 patients have been analysed together with a follow-up of the success rate of surgery. Most of the transplants were mature teeth, 37 out of 51, with closed apex. The majority of transplantations were carried out in order to replace single tooth losses (40) but in 11 cases, the teeth were used as an abutment in prosthetic rehabilitation. In 14 cases, an impacted tooth was transplanted to its normal position. The follow-up ranged from 3 months up to 10 years. No progressive root resorption has been observed so far; only 6 cases with slight surface resorption. Clinical signs of anchylosis were noticed in 4 teeth and shallow bone defects in 6 patients. Small- or medium-sized periapical destructions were observed in 4 cases. Mature transplanted teeth were always subjected to endodontic therapy within a month; the immobilisation varied between 2-4 weeks, while trying to keep it as short as possible with maintained stability. The experiences so far achieved do encourage a more comprehensive use of the method to solve problems associated with oral rehabilitation, from both prosthodontic and orthodontic points of view.

Adolescent↗
PubMed1987

Le Fort fractures (I). A study of frequency, etiology and treatment.

The cause and frequency of maxillary fractures as well as type of treatment performed has been reviewed in this study. During the time period between 1969 and 1982, a total of 301 maxillary fractures have been treated at our Department of Oral and Maxillofacial Surgery in Gothenburg. The period has been subdivided in 3 parts to evaluate whether differences in the amount of severe fractures could be observed. Since a law was instituted in Sweden in 1975 calling for a mandatory use of front seat belts, the frequency of fractures related to the time periods before and after 1975 could be of interest. We found a surprisingly equal number of fracture incidents during the different periods of time, but a decreasing number of maxillary fractures of type le Fort I, II and III; partial maxillary fractures on the other hand, had increased in number.

Accidents, Traffic↗