Reabilitação protética de paciente maxilectomizados: relato de caso / Prosthetic rehabilitation of patients maxilectomizados: case report

O Ameloblastoma é uma neoplasia composta por epitélio odontogênico, sendo tumor de crescimento lento, localmente invasivo, e com grande capacidade de destruição e expansão, clinicamente persistente. O tratamento de escolha, na maioria dos casos, é a intervenção cirúrgica radical, que consiste na ressecção em bloco. A reabilitação protética é uma das alternativas de tratamento para solucionar defeitos faciais congênitos ou adquiridos. Este artigo irá relatar a reabilitação de paciente com prótese obturadora após ter passado por cirurgia de maxilectomia com sequelas de comunicação buco antral. A prótese obturadora foi confeccionada de forma que formaram-se bolsas pneumáticas para alívio do peso da mesma. A paciente compareceu à Clínica Odontológica Universitária de Universidade Estadual de Londrina (COU-UEL) usando prótese obturadora desadaptada e que causava desconforto. Após analise da prótese, planejou-se a reabilitação protética com prótese obturadora superior, e prótese parcial removível inferior, para melhor adequação do sistema estomatognático. Utilizou-se a técnica de dupla moldagem do arco superior e inferior com silicone de adição de consistência pesada. Foram confeccionadas zonas de alívio nos moldes obtidos da primeira moldagem e em seguida foram realizadas as moldagens com silicone de adição de consistência leve. Foi registrada a relação intermaxilar que possibilitou a adequada montagem dos dentes que, após prova e ajustes adequados, foi acrilizada. A prótese obturadora proporcionou melhor qualidade de vida devido a melhora na fonação, deglutição, estética, melhorando sua autoestima e reintegrando o indivíduo à sociedade

Ameloblastoma is a slow growing tumor of odontogenic epithelium, locally invasive, and with great capacity for tissue destruction and is clinically persistent. The treatment of choice in most cases is the radical surgical intervention, which constitutes of bloc resection. The prosthetic rehabilitation is an alternative treatment to solve congenital facial defects or acquired. Another treatment option is the reconstructive plastic surgery, but it depends on patient’s age, medical history, financial condition and defect extension. This clinical case will report the patient rehabilitation with obturator prosthesis after maxillectomy surgery with antral buco communication. The patient attended the COU / UEL using an obturator prosthesis. The prosthesis was poorly fitting and causing discomfort. After prosthesis analysis, prosthetic rehabilitation was planned with a maxillary obturator prosthesis and mandible removable partial dentures. Double impression technique was performed for both arches with heavy consistency addition silicone. Relief areas were prepared in the first impression and then another impression was performed with mild consistency silicone addition. The molds were cast in plaster type IV, for dies and production of evidence bases in clear acrylic resin with wax rollers for intermaxillary records. Intermaxillary relationship was recorded and allowed adequate teeth positioning. The obturator prosthesis provided a better quality of life due to improvement in speech, swallowing, aesthetics, and patient self-esteem

Comparison of obturator prosthesis fabricated using different techniques and its effect on the management of a hemipalatomaxillectomy patient.

Odontogenic tumours involving the maxilla or mandible are usually treated with surgical resection. To prevent recurrence, extensive surgical intervention might be carried out leaving the patient with anatomical defects. However, rehabilitation of such patients with an obturator can improve function, facial form and social acceptance. In this case, we have evaluated the different designs and techniques of fabrication of an obturator prosthesis used for the rehabilitation of a hemipalatomaxillectomy patient. A 40-year-old man presented with a loose fitting obturator prosthesis. He had undergone hemipalatomaxillectomy for the treatment of an ameloblastoma 2 years earlier and had been using an obturator prosthesis since then. Hollow-bulb obturator prostheses were fabricated using two different methods, the lost salt and open lid techniques. The obturator prosthesis fabricated with the lost salt technique weighed less than the patient's old obturator. But the obturator fabricated using the open lid technique did not only considerably reduce the weight of the prosthesis but also improved health, function, aesthetics, phonetics and quality of life in this hemipalatomaxillectomy patient.

Rehabilitation with dental implants in microvascular iliac graft after solid ameloblastoma resection: a case report.

PURPOSE: Ameloblastoma is a true odontogenic tumor that is most frequently found in clinical practice. Osseous resection with clear margins is the recommended treatment followed by bone reconstruction, such as a vascularized graft. The use of osseointegrated dental implants for rehabilitation is advisable, as it allows the recovery of the masticatory function. MATERIALS AND METHODS: This case report includes 1 subject, a patient who presented with a large ameloblastoma treated by resection, a microvascular iliac graft, and dental implants. RESULTS: After 6 months of regular control, the patient exhibited perfect healing of both the soft tissues and bone graft. At the time of this report, the patient had undergone 36 months of clinical and radiographic follow-up and had not exhibited any sign of osseous loss, implant mobility, or tumor recurrence. CONCLUSIONS: The outcome of this case indicates that a microvascular graft and subsequent dental implantation is a good treatment plan that aids in a quick functional rehabilitation in ameloblastoma patients.

Replacement of mandibular posterior teeth with implants in a postmandibular resection case: a case report.

This case report describes the prosthetic rehabilitation of a patient who was treated for ameloblastoma by segmental resection of the mandible. Because of the size of the defect it was decided to use a healing obturator to facilitate bone formation in the defect. At the end of 3 months, bone formation had led to complete obliteration of the defect with an almost complete fill to the crest of the ridge. The next phase of the treatment was prosthetic rehabilitation. The patient preferred a fixed replacement of teeth as opposed to a removable option. The final treatment plan was an implant-supported fixed prosthesis that was progressively loaded.

[Plate related complication after mandibular reconstruction].

OBJECTIVE: To evaluate the complications and factors associated with titanium plates in mandibular reconstruction with different methods. METHODS: A retrospective analysis of 660 patients who received primary reconstruction of the mandible was conducted. The characters of the mandibular defect and methods of reconstruction were recorded. The complications and factors associated with the reconstruction were analyzed. RESULTS: The majority of mandibular defect was in a shape of L (n = 324 ). The total complication rate was 14.7% (97/660), which included screw loosening 5.8% (38/660), plate fracture 3.3% (22/660), plate exposure 3.8% (25/660), infection 7.4% (49/660) and malunion or ununion 2.9% (19/660). The mandibular defects reconstructed by reconstructive plates had a higher complication rate than that by bone grafts. The complication rate was 10.8% (63/586) in cases reconstructed by bone grafts with miniplates. The complications were associated with radiation therapy and diabetes. Radiation therapy had a significant effect on plate exposure. CONCLUSIONS: Reconstruction with bone grafts can minimize the rate of plate related complication. The complications were associated with radiation therapy and diabetes.

Mandibular resection and reconstruction in the management of extensive ameloblastoma.

PURPOSE: To present our experience with the management of 31 extensive mandibular ameloblastomas treated with segmental mandibulectomy, reconstruction with free fibula or iliac crest flap, and rehabilitation with immediate or delayed endosteal dental implants. PATIENTS AND METHODS: The study sample comprised 31 patients with histologically confirmed mandibular ameloblastomas. Primary ameloblastomas were treated in 23 patients, and recurrent ameloblastomas affected 8 patients. Mandibular defect sizes ranged from 3.5 to 12.5 cm (mean, 5.6 cm). A free fibula osseous or osteocutaneous flap was used 17 times for reconstruction; in the remaining 14, a free iliac crest osseous or osteomuscular flap was chosen. Dental implants were positioned in 25 patients; implant procedures were performed simultaneously with reconstruction in 21 cases. RESULTS: All flaps were transplanted successfully, and no major complication occurred postoperatively. Final histologic examinations showed 27 multicystic and 4 unicystic ameloblastomas. Free margins were achieved in all patients. The duration of follow-up was 18 to 120 months (mean, 53.6 months). No patient showed clinical or radiologic signs of recurrence. The dental implant success rate was 100%. CONCLUSIONS: Segmental mandibular resection followed by immediate defect reconstruction with bone-containing free flaps with immediate dental implant placement should be considered as the treatment of choice for extensive mandibular ameloblastomas.

Mandible reconstruction with transport-disc distraction osteogenesis in children of deciduous dentition.

Reconstructing segmental mandibular defects in children of deciduous dentition is a challenge. The authors treated a 23-month-old girl with a segmental mandibular defect secondary to tumour resection. Considering the unpredictable negative impacts of the autogenous bone grafting method on the musculoskeletal system of the donor sites, which was growing rapidly at this age, the authors applied transport disc distraction osteogenesis (TDDO) to reconstruct the mandible discontinuity. To the best of the authors' knowledge, this is the first time TDDO has been used for mandible reconstruction in such a young patient with deciduous dentition. Aesthetics and function were restored satisfactorily at the end of treatment. The facial appearance and occlusion were stable through the 35 month follow-up, possibly due to the growth of the regenerated bone parallel with the rest of the maxillofacial skeleton. The satisfactory reconstruction also contributed to the patient's physical and psychological development. The success of mandible reconstruction with TDDO in this study casts new light on the management of segmental mandibular defect in children with deciduous dentition.

Implant mandibular rehabilitation postoncologic segmental resection: a clinical report.

In cases of reconstruction of a discontinuity defect of the mandible, the surgeon has a major responsibility to maximize function as well as cosmetics and to preserve quality of life, restoring mastication, speech, and appearance. Treatment of mandibular discontinuity defects is a complex process and, among other methods, includes the use of free vascularized flaps. A variety of donor sites have been used for this purpose, including the iliac crest, radius, scapula, and fibula.At this time, the iliac crest free flap represents a versatile reconstruction method after mandibular ablation. This article reports a clinical case using the iliac crest free flap for comprehensive reconstruction of discontinuity defects in the mandible after resections of an aggressive odontogenic tumor. The immediate implant positioning reduced the number of surgical procedures and the rehabilitation time.

[Application of computer aided design-computer aided manufacture technique in mandible defect reconstruction with individual titanium prosthesis].

OBJECTIVE: To investigate the application of computer aided design-computer aided manufacture (CAD-CAM) technique in the reconstruction of mandible defect with individual titanium prosthesis. METHODS: Six patients with large mandibular ramus and angle tumor were spiral CT scanned preoperatively, and the CAD-CAM was used to design and make individual titanium prosthesis for reconstructing the mandibular defects after resection of the tumor. The prosthesis were assembled during operation. Postoperative follow-up period was 9 - 38 months. RESULTS: The design and manufacture of titanium prosthesis by use of CAD-CAM technique was convenient and the prosthesis fitted the defects very well. The outline of the face, the occlusion and function were restored. After 9 - 38 months of follow-up, the mandibular symmetry was good. CONCLUSIONS: The application of CAD-CAM provided accurate simulation and fast manufacturing process for the titanium prosthesis in the repair of mandibular defect.

Complete oral rehabilitation of a postresection ameloblastoma patient: a clinical case report.

Conventional ameloblastomas are rare, benign, epithelial odontogenic tumors that tend to grow slowly in the mandible or maxilla, but are locally invasive and can be highly destructive of the surrounding dental anatomy. Aggressive resection is the most effective method of eliminating the tumors, but treatment can further contribute to patient deformity and malfunction. Ameloblastomas also have a high rate of recurrence, which significantly diminishes 8 years after resection, but still requires vigilant clinical monitoring. This case report describes the complete oral rehabilitation of a postresection ameloblastoma patient with a mandibular reconstruction plate and partial edentulism. An autogenous graft was taken from the patient's iliac crest, shaped to fit the defect, and attached with bone screws. After graft incorporation, dental implants were successfully placed into the augmented ridge and restored with a fixed partial denture. There was no evidence of tumor recurrence during the 10 months of treatment or 8 years of subsequent clinical monitoring.

Autotransplantation of two maxillary premolars in a free vascularized fibula reconstructed mandible.

A 10-year-old female patient with a fibula transplant in her left hemimandible due to ameloblastoma treatment was referred for combined orthodontic and surgical planning and treatment to observe and prevent expected asymmetric facial development and malocclusion, because the premolars and molars on the left side of the mandible were missing. The patient had an Angle Class II malocclusion and arch length discrepancy in the upper jaw. The two second premolars in the maxilla were transplanted into the neomandible to create occlusion on the left side and retention for orthodontic treatment. Clinical and radiological examination 3 months postoperatively showed good integration of both premolars without pocket formation. After 4 months, active orthodontic treatment with fixed appliances was started to create sufficient arch space in the upper jaw for both canines to erupt and to extrude and for the transplanted premolars in the lower jaw to rotate and align into the planned positions. This case report demonstrates that autotransplantation of premolars into a fibula transplant can be a successful dental rehabilitation procedure.

Implant stability and peri-implant parameters in free vascularized iliac graft transplantation patients: report of three ameloblastoma cases.

BACKGROUND: Ameloblastoma, a benign but locally aggressive tumor, accounts for 9% to 11% of all odontogenic tumors. Radical procedures, including resection, are performed. To restore functions after resection, free vascularized iliac grafts followed by a dental implant-supported prosthesis are used as a successful treatment option. The aim of this case report is to evaluate the peri-implant clinical status and stability of dental implants placed in patients with advanced-stage mandibular ameloblastomas. METHODS: Examinations of three patients revealed extensive ameloblastomas, and hemimandibulectomies were performed. Six months after surgeries, two to four dental implants were placed. After 6 months of healing, one fixed prosthesis and two removable prostheses were delivered. The stability of implants was evaluated at the surgical baseline and 1, 3, 6, 9, and 12 months after surgery by resonance-frequency (RF) analysis. Peri-implant clinical parameters (i.e., plaque index [PI], gingival index [GI], gingival bleeding time index [GBTI], and peri-implant probing depth [PD]) were recorded at the delivery of the prosthesis and at follow-ups at 1, 3, and 6 months. RESULTS: Nine implants that supported one removable prosthesis and two fixed prostheses were placed. RF analysis revealed no significant changes in implant stability during 12 months of follow-up. Peri-implant clinical parameters (PI, GI, and GBTI) showed slight improvements during follow-up. Although advancements were observed in 6 months, PDs were found to be deeper than optimal measurements for the whole observation time. CONCLUSION: The implant-supported prosthetic rehabilitation of patients with ameloblastomas reconstructed with free vascularized iliac crest grafts can be a predictive alternative for improving the quality of life of patients in which a high implant stability and acceptable peri-implant health may be achieved.

Esthetic and functional reconstruction of the posttumoral interrupted mandible with double-barrel fibular free flap graft: rationale for a microsurgical and prosthodontic approach.

Reconstruction after substantial osseous, cutaneous, and muscular tissue loss following a mandibular resection is a challenge. The use of a fibular free flap is an outstanding, but delicate, treatment option. These grafts, using the double-barrel technique, can achieve an almost complete reconstruction of the mandibular defect. The challenge posed by these treatments is to achieve an end result that is both functional and esthetically pleasing-an endeavor that requires a defined prosthetic plan prior to complete microsurgical reconstruction. Using a detailed clinical case, this article discusses the importance of planning the mandible reconstruction with double-barrel fibular graft in view of an implant-supported fixed partial denture. Immediate implant loading was even possible in this case. This approach allows improvement of the final esthetic and functional result of such a complex rehabilitation. Maxillofacial reconstructive surgery should seek to establish a near-as-normal anatomic situation that will allow a permanent implant rehabilitation that is both esthetic and durable.

Rehabilitation of recurrent unicystic ameloblastoma using distraction osteogenesis and dental implants.

Ameloblastoma is a true neoplasm of odontogenic epithelial origin. Surgical resection of the ameloblastoma is well-documented and an accepted treatment modality. Vertical distraction of the alveolar process is an efficient method for augmentation. This method of providing additional bone and soft tissue for implant placement is becoming more common. This clinical report describes the use of distraction osteogenesis and fixed implant supported prosthesis to treat a post-surgical alveolar defect as a result of the resection of a unicystic ameloblastoma in the anterior mandibular region. As a result of alveolar distraction a segment of mature bone was transported vertically in order to lengthen the crest, for better implant anchorage. Further clinical and experimental studies of the technique with long-term follow-up are needed, to confirm bone and implant stability, as it relates to alveolar height.

Clinical case report: a multidisciplinary solution to a complex restorative problem and a macro-esthetic dilemma.

The restoration of facial harmony and establishment of a functional occlusion can pose unique problems in the treatment of complex dentoskeletal malformations. The advantages offered by the conjoint treatment planning, proper treatment sequencing, and the cooperation of various dental providers can create the best solutions for complex problems in patients. This case presentation demonstrates the interdisciplinary approach used by implant and restorative dentists, oral and maxillofacial surgeons, and orthodontists in a case that required "thinking outside the box" for optimal functional and esthetic solutions.

Two-step transport-disk distraction osteogenesis in reconstruction of mandibular defect involving body and ramus.

One-step transport-disk distraction osteogenesis (TDDO) is effective for repairing segmental mandibular defects. The authors studied whether it was effective for reconstructing angled large mandibular defects using a two-step TDDO procedure in seven patients suffering from neoplasm. In the two-step TDDO procedure, the first distraction (horizontal distraction) was initiated immediately after mandibulectomy, aimed at restoring the mandibular body. It was followed by the second distraction, which was obliquely vertical and aimed at restoring the height of the ramus. The distraction rate was set at twice 0.4mm/day. The treatment lasted for 14-18 months. The horizontal distraction length ranged from 48 to 55mm, and the vertical one from 33 to 43mm, with full ossification in the distraction area. No obvious shift of mandible, malocclusion or mouth opening limitation was observed. Patients had a regular diet and spoke clearly. In conclusion, the two-step TDDO is still an option for the reconstruction of large angled mandibular defects when patients are prudently selected, despite the long treatment period required.

Oral rehabilitation with osseointegrated implants in oncologic patients.

PURPOSE: The esthetic and functional rehabilitation of oncologic patients subjected to major resection surgery constitutes one of the greatest challenges for the head and neck surgeon. Immediate bone reconstruction with microsurgical free tissue transfer and dental implants has constituted a genuine revolution in the management of such patients. MATERIALS AND METHODS: We present a series of 111 oncologic patients, involving a total of 706 implants, who underwent reconstruction with pedicled or free microsurgical flaps. RESULTS: The osseointegration success rate was 92.9%, with a global failure rate (malpositioning or failed osseointegration or loading) of 15%. Failure particularly affected the group of irradiated patients and those subjected to lateral osseomyocutaneous trapezial pedicled flap reconstruction. Excellent results were obtained with the fibular and iliac crest free flaps and osseointegrated dental implants. CONCLUSIONS: The difficulties of prosthetic rehabilitation are discussed, along with the individualized solutions applied, the repercussions on the temporomandibular joint, and the management protocol adopted by our service.

Pediatric mandibular reconstruction after benign tumor ablation using a vascularized fibular flap.

This study evaluated the aesthetic and functional outcomes of vascularized fibular flaps used for pediatric mandibular reconstruction. Six pediatric patients ranging in age from 12 to 15 years underwent mandibular reconstruction using a vascularized fibula flap with a skin paddle, after benign tumor ablation. All of the flap transfers were successful, and there were no complications. Panorex radiographs showed good bone union in all patients. The flap conferred adequate support for dental rehabilitation. The mean follow-up was 24.2 months. The aesthetic and functional outcomes were normal. No patient had recurrence. A vascularized fibular flap is a very reliable method for reconstructing the pediatric mandible after benign tumor ablation.