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Results for “Mandibular Prosthesis”

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PubMed1994

Mandibular reconstruction with cancellous bone, hydroxylapatite and titanium mesh.

Over the past 20 years, titanium mesh combined with autologous iliac crest spongiosa and hydroxylapatite has performed well in the restoration of mandibular discontinuity defects in 79 patients. In 14 irradiated patients with a transplant bed of inferior quality, however, complications and failures occurred more often than in the 65 non irradiated patients. The results of our investigation clearly show that the success of mandibular reconstruction mainly depends on a well vascularized transplant bed.

Adult↗
PubMed1991

Experience with AO reconstruction plates after partial mandibular resection involving its continuity.

A report is presented on experience with the use of 54 plates, without primary bone grafts, after resections for malignant tumours involving the continuity of the mandible, in 52 patients. There were complications in 27 cases: postoperative infection or soft tissue dehiscence occurred 20 times, chronic soft tissue perforation once, screw loosening twice, and plate fracture four times. Adjuvant radiotherapy and/or chemotherapy had no effect on the incidence of the complications. Seventeen of the plates (a good 30%) had to be removed prematurely due to the complications. Major deformity did not always occur if relative stabilization had developed through cicatrix formation. Thirty-seven plates (barely 70%) remained: in 19 cases until the death of the patient, in 3 cases until recurrence, in 12 cases until bone grafting, and in 3 cases they were still in situ up to 65 months. In principle, reconstruction plates have proven themselves. However, application and soft tissue coverage need great care and a great deal of experience.

Bone Plates↗
PubMed1998

Primary temporary AO plate reconstruction of the mandible.

OBJECTIVE: This study assessed the incidence of complications and revisions after primary temporary AO plate reconstructions of the mandible performed from 1971 through 1996. STUDY DESIGN: In a retrospective record review, the data of 51 patients undergoing primary temporary AO plate reconstructions after composite mandibular resection were analyzed according to age, gender, date of reconstruction, anatomic location of reconstruction, use of additional radiotherapy and/or flap surgery, and incidence of associated complications and revisions. RESULTS: Associated complications and revisions accompanying primary temporary AO plate reconstructions were evaluated through use of the incidence rates of associated complications (IACs) and revisions (IARs), which are reported as the numbers of associated complications and revisions, respectively, per 100 patients. Of the entire sample, the highest incidence rate of associated complications was associated with infection (33.5); this was followed by the rates for plate exposure (27.9) and plate fracture (10.7). With an overall incidence rate of 38.3 revisions per 100 patients, the corresponding site-related incidence rates of associated revisions were found to be 55.0 for reconstructions of the anterior mandible crossing the midline, 37.1 for those of the body segment of the mandible, and 31.1 for reconstructions involving the ramus and/or condyle area of the mandible. Revision rates were observed to be significantly higher in irradiated (53.6 vs 31.5) and non-flap-added reconstructions (43.2 vs 24.8). Analysis of treatment group-related incidences revealed irradiated non-flap-added reconstructions to be associated with the highest failure rates, whereas additional flap surgery resulted in a significant reduction in complications (50.0 vs 108.0) and revisions (20.0 vs 65.7). CONCLUSIONS: This study showed primary temporary AO plate reconstructions after composite mandibular resection to be associated with a high rate of complications and revisions. The results emphasize the need to relate outcome measures to site-related and treatment-related parameters.

Adult↗
PubMed1977

Cancer of the floor of the mouth: surgical management.

After discussing the changing incidence and known difficulties in the management of mouth floor cancer, reasons are given for the increased use of surgery in treating the more extensive lesions. The significance of the topographic anatomy, patterns of lymph drainage and surgical pathology is emphasized. Principles of treatment, indications and types of operation are discussed for the main lesions encountered. Following this the preparation of patients for surgery, the methods of anaesthesia and certain technical details of surgical treatment are given. The importance of after-care and particular measures to avoid complications are stressed and conclusions reached. The paper is based on experience in the Head and Neck Unit of the Royal Marsden Hospital, London, mainly since 1965. It also derives from an extensive report on 189 cases of floor of mouth cancer seen and treated at the Hospital from 1950-1974.

Anesthesia↗
PubMed2002

Bone resorption after alloplastic augmentation of the mandible.

Augmentation mentoplasty is a commonly performed operation especially in conjunction with rhinoplasty. While various materials have previously been used for this procedure, silastic has been the implant of choice for the last three decades. Concerns have been raised due to the occurrence of bone resorption beneath these implants. Controversy prevails as to the cause and the long-term effects of the resorption. It has been suggested by some that the resorption is self-limiting although this has not been confirmed in clinical studies. In total, 40 patients with silastic implants, who had a mean follow-up of 20 months (8-60 months), were studied radiologically. In 21 of them (52%), a degree of resorption from 0.5 to 2 mm was observed. Spearman's rank correlation showed a statistically significant relationship between the degree of resorption and the time lapse since surgery (P = 0.048).

Adolescent↗
PubMed1999

Clinical efficacy of prosthetic mandibular advancement on obstructive sleep apnea syndrome.

In order to clarify the efficacy and indication of prosthetic mandibular advancement (PMA) on obstructive sleep apnea syndrome (OSAS), we made a comparison of both the polysomnographic findings and the upper airway configuration between before and during PMA on 19 OSAS patients. During PMA, there was a significant decreased apnea hypopnea index compared to before treatment. The changes in magnetic resonance imaging of the upper airway during sleep with PMA indicated that the treatment is regarded to be the first choice for OSAS patients with glossopharyngeal obstruction. In addition to that, the treatment might be considered for use in velopharyngeal obstruction.

Airway Resistance↗
PubMed2002

Fracture of mandibular reconstruction plates used after tumor resection.

PURPOSE: We assessed the incidence of fractured plates after primary temporary AO plate reconstruction of the mandible following tumor resection. PATIENTS AND METHODS: One hundred ten patients were retrospectively evaluated according to the extent of the tumor, anatomic location of the reconstruction, type of plate, additional use of radiotherapy or flap surgery (or both), and the incidence of fractured plates. RESULTS: Fractured plates occurred in 8 of 110 patients. Most occurred less than 6 months after surgery. All of the 8 patients had a malignant tumor; 2 had received radiation therapy and 4 had skin flaps placed. The fractured plate was the straight type in 1 patient and the angular type in 7 patients. Among patients who had fractured plates, the average number of remaining teeth was 12.8 in the maxilla and 9.5 in the mandible. CONCLUSIONS: Fractured plates were more common among patients with oral cancer with a segmental defect that did not cross the midline in whom an angular-type plate was used and no bone grafting was performed.

Adolescent↗
PubMed2002

Long-term functional outcome of mandibular reconstruction with stainless steel AO reconstruction plates.

Mandibular continuity defects are usually reconstructed with bone grafts. However, factors associated with the tumour and the patient can still be reasons to choose reconstruction plates. The aim of this study was to find out the results of mandibular reconstructions with stainless steel AO reconstruction plates after a long follow-up period. The records of 36 patients were reviewed for personal data and the history of disease, treatment and complications. Patients with failed reconstructions were compared with those in whom the procedure had been successful. Patients and surgeons gave their opinion on the functional and cosmetic results. The mean follow-up was 39 months (range 4-99); 4 patients were withdrawn because they developed early recurrent disease and in 17 patients the reconstruction failed. We found no significant differences between the successful and the failed group. Fourteen patients could be evaluated for functional outcome, 10 of whom were totally or satisfactorily rehabilitated. Therefore, stainless steel reconstruction plates can be used in patients when other options are inappropriate.

Adult↗
PubMed2002

Mandibular reconstruction: a clinical and radiographic animal study on the use of autogenous scaffolds and platelet-rich plasma.

This paper reports on an experimental animal study evaluating a method of mandibular reconstruction. After a successful pilot study, 28 goats underwent a continuity resection of the mandibular angle. Primary reconstruction was carried out using specially designed osteosynthesis plates and screws. The defect was bridged by the original cortical scaffold, filled with an autogenous bone graft from the iliac crest. To accelerate bone healing, platelet-rich plasma (PRP) was mixed with the particulate bone graft in 14 goats. All goats had uneventful healing. The osteosynthesis plates and screws withstood immediate loading for periods varying from 3 weeks to 3 months. The use of PRP appeared to enhance bone healing considerably.

Animals↗
PubMed2000

Oromandibular reconstruction.

Oromandibular reconstruction is one of the greatest challenges of the head and neck surgeon. The ideal rehabilitation of the mandible and associated soft tissues requires maintaining premorbid occlusion, providing the opportunity for dental restoration, and preventing salivary incontinence. The approach to each patient must be individualized to maximize speech, swallowing, and mastication. Additionally, the surgeon must strive to fulfill these goals while achieving the most pleasing cosmetic result possible. Although some patients may be treated without reconstruction or with a metal plate and soft tissue flap, the majority of patients benefit from bony reconstruction utilizing a free flap. Reconstruction with free flaps results in more primary healing and fewer wound complications. Challenges specific to reconstructing the temporomandibular joint are discussed. We also review the indications for the different rehabilitative options and the merits of the individual flaps.

Arthroplasty↗
PubMed2003

Genioplasty.

Genioplasty has been a useful and frequently employed technique in the aesthetic facial surgeon's armamentarium. However, as the prevalence of obstructive sleep apnea becomes more apparent and its diagnosis more frequent, genioplasty has also evolved to a commonly performed procedure for reconstruction of the upper airway. This article discusses patient evaluation and surgical techniques used in aesthetic and functional surgery of the chin. Because these topics have been discussed extensively in the literature, this will serve as a synopsis of current techniques.

Airway Obstruction↗
PubMed2003

[Congenital teratoma of the skull base: case report of an interdisciplinary treatment].

Teratomas of the oropharynx are quite rare congenital tumors. Even more rare than oropharyngeal teratomas are those with additional intracranial extension. Reviewing the literature the prognosis of these cases has been poor. In the majority stillbirth or immediate postpartum death following respiratory obstruction is reported. We present a case of a congenital teratoma of the oral cavity with intracranial extension in a female neonate. After several intraoral tumor resections to establish secure airway in the postpartum period the total tumor resection had to be performed at the age of 6 month via a lateral transmandibular approach to the skull base. By using extraoral distaction devices the operation related microsomia of the mandible could be corrected at the age of 5 years. At 7 years follow-up the girl presented free of recurrence and without any neurological or functional deficits.

Female↗