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PubMed1990

[Hyperplasia of the coronoid processes of the mandible--case-history].

Hyperplasia of the coronoid processes of the mandible in a 36-year-old man was associated, in addition to difficult opening of the mouth, with noises of apparently articular origin. The noise was due to the shifting of the coronoid processes along the inner surfaces of the temporal processes of the facial bones. On the X-ray picture also the elongated styloid processes were striking as well as symmetrial exostoses at the lower borderline of the mandible and condylar processes deformed without any apparent cause.

Adult↗
PubMed1990

[Radiological assessment of invasion of the mandible by squamous cell carcinomas of the oral cavity].

Three cases of invasion of the mandible by squamous carcinomas of the oral cavity are presented in this study. The current literature is reviewed and the diagnostic capabilities of contemporary imaging methods are emphasised. The detection of the location and extent of the possible infiltration of the mandible is a determinant factor concerning the choice of treatment and prognosis.

Adult↗
PubMed1990

Angiomyoma of the mandible: a case report.

A rare case of intrabony angiomyoma affecting the mandible is presented. The patient was 25 years old male who complained of swelling and pain in the posterior segment of his lower jaw. Histopathologically diagnosed angiomyoma is discussed with emphasis on the pathogenesis in the present case. Literature concerning the lesion is reviewed. In the present paper we report a case of angiomyoma affecting the mandible. Angiomyomas are also known as vascular leiomyomas which commonly occur in the wrist and ankle region. They are painful tumours as was also evident in our case. These tumours are characterized histopathologically by convuluted thick walled vessels associated with bundles of well differentiated smooth muscle elements. They rarely affect the oral cavity. Therefore our case is one of the few cases affecting the oral cavity as reported earlier. Tumours of the smooth muscle cells which form involuntary muscle are known as leiomyomas. These commonly affect the alimentary tract. They are rarely found to affect the oral cavity.

Adult↗
PubMed1990

[Experimental study of growth and development of the dentofacial complex in the rat. Influence of anterior displacement of mandible].

The purpose of this study was to detect the influence on the growth and development of the maxillofacial cranium due to anterior crossbite in early childhood. The author observed the morphological changes of the maxillofacial cranium of rats in which of mandible was induced anterior crossbite artificially. Experimental animals used in this study were closed colony bred Wistar Crj rats. A total of 106 rats consisting of 65 in the experimental group and 41 in the control group were used. In the experiment, the appliance which was applied to the mandibular incisors of rats aged 30 days to induce anterior crossbite. X-ray photos of the head were taken in lateral and parietal at the age of 30, 60, 90 and 120 days and the soft X-ray photo of the right mandible isolated by sacrificing and decapitation of several animals at the respective ages. 1. The experimental rats have a tendency to lose weight in accordance with the appliance. The increase rate of weight in experimental group is similar to that in the control group and it was estimated that the appliance affected their weights a little. 2. The lateral cephalometric observation 1) The tip of the nasal bone was modified upwards in its position with advancing age. 2) In the mandibular angular region an inhibition of posterior growth was observed. 3) The dental arch length of maxilla was shorter and of mandibular was longer. 4) The molar changed its position upward, and the height of the upper facial region including the tooth and facial height had a lowering tendency. 3. The parietal cephalometric observation Parietal head X-ray photo showed a widening tendency of the width of anterior facial cranium and the anterior tip of zygomatic arch.

Animals↗
PubMed1990

Positioning and mobility of the mandibular condyle after surgical correction of the asymmetric, prognathic mandible.

Following the extraoral vertical subcondylar osteotomy in the correction of the highly asymmetric and prognathic mandible, only insignificant radiographic changes were observed in the temporomandibular joint 12 months postoperatively. Slight morphologic alterations of the condylar seating were demonstrated at occlusion, but there was no significant difference in condylar position between the two sides of the surgically corrected asymmetric mandible. The condylar axis did not deviate from the preoperative situation, and condylar axis did not deviate from the preoperative situation, and condylar mobility was fully resumed 12 months postoperatively. The extraoral vertical subcondylar osteotomy procedure is applicable in the treatment of combined mandibular asymmetry and prognathism and does not create morphologic changes that differ in the two temporomandibular joints.

Adolescent↗
PubMed1990

[Osteosarcoma of the mandible].

The report gives the example of the osteosarcoma in the mandible of the 76 years old female patient. As known from the literature, osteosarcoma in the maxillofacial region is a rare phenomenon, especially in the old age. Partial resection of the mandible with the elimination of tumor was performed.

Aged↗
PubMed1989

Resection and immediate reconstruction of parts of the mandible via intra-oral route.

Our experience in partial resection of parts of the mandible with immediate reconstruction using the iliac crest via the intraoral route is presented. 12 patients were treated in this way and the follow up varied between 1 to 3 years. The criteria assessed in the follow up included, behaviour of the bone graft, aesthetics functional behaviour of the bone transplant under the denture plates, and function of the mandibular branch of the facial nerve. Though infection with discharge of pus was noticed a few days post-operatively, with meticulous care with the use of systemic antibiotics and local irrigation of the wounds with antibiotics solution, the infection was usually overcome. Only in 2 cases were the bone grafts removed because the patients could not tolerate the nasogastric tube feeding for more than 2 or 3 days post-operatively and there was wound dehiscence with exposure of the graft. However the result achieved in this study made us conclude that the intra-oral approach for resection and immediate reconstruction of parts of the mandible will be our method of choice whenever possible.

Adolescent↗
PubMed1989

[Myxofibroma of the mandible].

In this article, a rare case of large myxofibroma of the mandible has been presented. The odontogenic myxoma originated from the mesenchym ise benign and can be arised from dental papilla, dental follicle or the periodontal ligament. Myxoma is mostly located in maxilla or mandible and accompanied by an unerupted tooth and can be seen in the second or third decade of the life. It is painless and uncapsulated and the growth of tumor is slow. Since it is uncapsulated, recurrence is about 25%. Myxoma can be confused radiologically with benign or malign lesions of jaws which are radiolucent in nature. Curretting, cauterization and resection are methods of treatment and the prognosis is good.

Adolescent↗
PubMedDate not supplied

[Stereognathograph--optoelectronic device for mandible movement recording].

The authors have presented the structure and potentiality of application of a new optoelectronic device called stereognathograph recording the function of mandibular condyles. The meter circuit of this device is placed on the sick's head and connected with the mandible's teeth by means of a peridental splint. It enables to record mandible's movements and in the view onto the horizontal and pterygoid plane and determine the mandibular condyles' position in relation to the chosen reference point in terms of measurable numerical three-dimensional quantities. Furthermore this device enables to designate the axis of rotation of mandibular condyles as well as to designate Bennet's angle and pterygoid angle precisely for individual setting of the SAM-2 articulator.

Dental Articulators↗
PubMed1989

[Repositioner of external fragment of mandibular ramus (ramus repositioner) in sagittal split ramus osteotomy of mandible].

In sagittal ramus split osteotomy of the mandible, rigid internal fixation of the fragments with screws has become one of the main fixation techniques. This screw-fixation has the advantages to reduce the period of intermaxillary fixation which is unpleasant for patients. On the other hand, it is necessary that the condyles are exactly positioned to the glenoid fossa after surgical correction. Incorrect repositioning of the mandibular ramus will induce serious problems, e.g. relapse caused by mandibular movement, pain of temporomandibular joint, occlusal dysfunction, etc. Some surgeons make efforts to avoid the problems by various methods. Postoperative radiographs are one of the procedures, which taken while the patient is on the operating table. Various appliances are also used for the purpose of repositioning ramus at operation. We have devised a simple appliance that allows the surgeon to be sure that the position of the external fragments of the mandibular ramus will be precisely established. We named this appliance "ramus repositioner". It consists of 1.2 mm orthodontic wire in diameter, cold-cure acrylic resin and titanium mini-plates. It is fabricated and tried to fit prior to the operation. At operation, both ends of its orthodontic wire are inserted into the tubes on the buccal surfaces of the maxillary first molars. The positions of the mandibular ramus involved condyles are recorded by mini-plates on this appliance with its exclusive self-tapping screws preoperatively. Then the appliance is removed and mandible is splitted. After splitting, the appliance is replaced with the screw hole landmarks that tapped before.(ABSTRACT TRUNCATED AT 250 WORDS)

Fracture Fixation, Internal↗
PubMed1989

[Paget's degeneration of the juxta-alveolar portion of the mandible in subjects with generalized osteoporosis. Clinical study].

After the description of the etiopathogenetic aspects and of the pathologic anatomy lesion more typical of the Paget's disease, the A.A. describe a interesting case of the mandible's degeneration in a patient with chronic osteoporosis. The patient does not masticate. The treatment has been to remodelling of the mandible. We made a scrupulous check of laboratory research and the radiographical, biological and histological reports to exclude osteosarcoma and gigantic cells tumour.

Calcitonin↗
PubMed1989

[Mandible function in taking construction bite for activator].

Functional effects of construction bite for activator (Andresen type) especially on lateral pterygoid muscle, as well as the positional changes of the mandible, hyoid bone and surface EMGs from bilateral anterior temporal (TA) and masseter (MM) muscle, were studied on the electric force scale, MKG, EMG and cephalometric radiographs in 14 subjects with anterior cross bite in mixed dentition. The cephalometric radiographs were taken at the start of each patient's treatment. One was taken with the mandible in the intercuspal position and one was also taken with the activator in the mouth at the overjet improvement. The activator patients were divided into two groups because of differences in the direction of movement of the hyoid bone in the FH plane. In group O (7 patients), the movement of the hyoid bone was at an oblique angle to the FH plane, while in group D (7 patients) the movement ot the hyoid bone with nearly direct below angle to FH plane. The patients were further divided into three types because of differences in the distance between the hyoid bone and mental spine, and combined with the groups OA (3 patients), OB (2 patients), OC (2 patients), DA (5 patients), DB (2 patients) and DC (Naught). The results obtained were as follows: The forces for the construction bite for groups O and D were 2.71 Kg and 2.72 kg, respectively. Type OC required significantly heavier force. (p less than 0.05) In the condylar test, O group was significantly smaller at the start of treatment, but not after overjet improvement. Type OA and OB were also significantly smaller at the start of treatment. (p less than 0.05) Velocity of opening for group D was significantly (p less than 0.05) faster at the start of treatment, but not after that. There was no significant difference in EMGs between the groups, with activator in the mouse D group much increased as it EMGs. The EMGs M/T ratio for both groups was approximately 100% at the start of treatment for overjet improvement. In cases with no or slight lateral shift in the recorded path of closure or in the incisal region, no large differences were recorded laterally. Large EMGs differences were recorded with lateral shift in the incisal region, especially when taking the construction bite.

Activator Appliances↗
PubMed1989

Concomitant osteitis fibrosa cystica and ameloblastoma of the mandible.

A patient with a multiloculated cystic lesion of the mandible, and clinical as well as biological features of hyperparathyroidism is presented. This association suggesting the diagnosis of brown tumor was actually due to an ameloblastoma of the mandible. Such a concomitant association of an ameloblastoma with symptomatic hyperparathyroidism has never been reported to our knowledge.

Adenoma↗
PubMed1978

[Biomechanical studies on various methods of osteosynthesis on a photoelastic model of the mandible].

Biomechanical studies on a model of the mandible served to verify the stability of a fracture treated with the techniques of pressure-plate osteosynthesis, traction-bandage osteosynthesis and percutaneous compression osteosynthesis, respectively. Stress distribution in the model were determined photoelastically. In this way, it has been possible to obtain informations about stresses caused by different loads (biting-off, stress on the left or right lateral region). Of the methods of osteosynthesis under investigation, plate osteosynthesis yielded the most stable union of the fragments. Satisfactory values were also achieved by means of traction-bandage osteosynthesis and percutaneous compression osteosynthesis. Consequently, these methods may be regarded as function-stable. Conclusions as to the optimal location of the osteosynthesis material can be drawn from an exact analysis of the stress curves. Maximum stress on the mandible, especially in the anterior region, should be avoided for a least 3 weeks.

Biomechanical Phenomena↗
PubMed1989

Desmoplastic fibroma of the mandible.

Desmoplastic fibromas of the facial skeleton are the bony counterparts to the soft-tissue desmoid tumors and are almost exclusively confined to the mandible. The diagnosis should be considered whenever a rapidly increasing swelling with little functional disability is noted in the mandible. Historical, clinical, radiologic, and histologic findings must be correlated to establish the correct diagnosis. Every effort must be made to distinguish these lesions from well-differentiated fibrosarcomas. An illustrative case is presented. The treatment of desmoplastic fibromas affecting the facial skeleton should be conservative. Curettage is recommended for small tumors. Wide resections with reconstruction should be reserved for larger lesions and for those that have recurred after conservative treatment.

Female↗
PubMed1979

Fatality from central hemangioma of the mandible.

Fatalities from central hemangiomas, including a new case, are reviewed. The importance of a thorough examination of young patients with suspicious gingival bleeding and mobile teeth before extraction is emphasized. The nature of the lesion and the methods of treatment are discussed. In the case reported, there were arteriovenous malformations in the soft tissues surrounding the mandible and a seemingly separate central mandibular lesion. The latter showed rapid growth throughout the mandible, ending fatally after spontaneous bleeding and extraction of the mandibular third molar. During the preceding three years, bilateral external carotid ligation had been performed and numerous conservative measures had been taken, including corticosteroid therapy, injections of Sotradecol, and telecobalt irradiation, all with little benefit.

Angiography↗
PubMed1986

Osteosarcoma of the mandible arising in fibrous dysplasia. A case report.

A Grade 3 chondroblastic osteosarcoma is reported in the mandible of a 37-year-old man with longstanding polyostotic fibrous dysplasia. There was also a history of multiple endocrine disturbances including hyperthyroidism, pituitary adenoma, and acromegaly. Malignant transformation of fibrous dysplasia is very rare and occurs most often when the lesion is polyostotic in distribution. The patient received preoperative radiation therapy followed immediately by marginal excision, i.e., left hemimandibulectomy. Forty-two months after initial presentation of the osteosarcoma of the mandible, he is alive with no evidence of disease.

Acromegaly↗
PubMedDate not supplied

Evaluation of bone scan by scintigraphy to detect subclinical invasion of the mandible by squamous cell carcinoma of the oral cavity.

A prospective study using scintigraphy was performed to compare the sensitivity of the Panorex roentgenogram and the bone scan in detecting subclinical invasion of the mandible by squamous cell carcinoma of the oral cavity and floor of the mouth. Twenty-five patients with squamous cell carcinoma of the floor of the mouth were evaluated preoperatively by both the Panorex and scintigraphic techniques and the results compared with postoperative pathologic findings. In 13 (52%) of the cases, Panorex and scintigraphic techniques were comparable in detecting tumor involvement in bone. In eight cases (32%) all three modalities had normal pathologic indications of the mandible. However, in four cases (16%) results of the scintigraphic techniques were abnormal and the Panorex, normal. In four separate cases, the extent of lesion demonstrable by scintiscanning was greater than delineated by Panorex; surgical specimen confirmed this finding. Pathologic examination of operative specimens confirmed tumor involvement. These data lead us to believe that the scintigraphic techniques may be more sensitive in detecting early mandibular involvement with squamous cell carcinoma than the Panorex technique and may help alter the therapeutic approach.

Adult↗