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cent criteria. Demographic and clinical data were retrieved. Im-munohistochemistry was performed to detect S-100 and CD57antigens.

Results: There were 29 PNST: 6 traumatic neuromas (TN),7 neurofibromas (NF), 7 Schwannomas (SW), 5 granular celltumors (GCT) and 4 palisaded encapsulated neuromas (PEN).There was no sex predominance, most patients were youngadults, the tongue was the most affected anatomical site, and thetumors were usually asymptomatic. All tumors showed diffusereactivity for S-100. Reactive nerve fibers permeated NF, GCTand PEN, in different pattern, and were absent within SW cases.

Conclusions: Schwann cells do not reach complete differ-entiation in PNST. Nerve fibers arrangement is useful to differ-entiate PNST.

METASTASES TO THE MAXILARY SINUS FROM COLONADENOCARCINOMA Ramos LMA1, Sabino-Bezerra JR2,Esteves SCB3, Vargas PA4, Almeida OP, Lopes MA2 - 1PI-RACICABA DENTAL SCHOOL, STATE UNIVERSITY OFCAMPINAS, PIRACICABA, SÃO PAULO, BRAZIL - ORALDIAGNOSIS/ORAL SEMIOLOGY, 2PIRACICABA DENTALSCHOOL, STATE UNIVERSITY OF CAMPINAS, PIRACI-CABA, SÃO PAULO, BRAZIL - ORAL DIAGNOSIS/ORALSEMIOLOGY, 3ONCOLOGY CENTER, HFC - RADIO-THERAPY, 4PIRACICABA DENTAL SCHOOL, STATE UNI-VERSITY OF CAMPINAS, PIRACICABA, SÃO PAULO,BRAZIL - ORAL DIAGNOSIS/ORAL PATHOLOGY

A 32-year-old woman presented to the radiotherapy depart-ment for palliative treatment of a maxillary tumor. Extraoralexam showed a swelling corresponding to maxillary and lateralnose region. Intraorally there was a painful enlargement on thehard palate. The medical history revealed that the patient had aprimary colon adenocarcinoma two years ago. Histological fea-tures of the slides obtained from maxillary biopsy showed ade-nocarcinoma infiltrating bone. Immunochemistry panel was pos-itive for CDX2 and AE1/AE1 cytokeratin, confirming thehypothesis of metastatic colon adenocarcinoma. Image examswere performed and showed other lesion in T1 vertebra. Afterthree months of the palliative treatment the patient died becauseof disseminate disease. Metastases to the maxillary sinus fromcolon adenocarcinoma is uncommon and the patient generallyhas a poor prognosis.

PARAFUNCTIONAL HABIT LESION: A DIAGNOSTICCHALLENGE Nicolielo LFP1, Pagin O1, Bravo-CalderónDM2, Oliveira DT2, Santos PSS1 - 1FACULDADE DE OD-ONTOLOGIA DE BAURU - USP - ESTOMATOLOGIA,2FACULDADE DE ODONTOLOGIA DE BAURU - USP -PATOLOGIA

A 26-year old man, complaining about rough, dry and peel-ing sensation in the lower lip mucosa for two months, was usingtopical corticosteroid by himself. Oral examination revealedslight edematous lower lip with normal mucosa. Parafunctionalhabits were not found. As toothpaste allergy was suggested,neutral toothpaste was prescribed and corticosteroid withdrawal.Within six weeks of presentation, the mucosa displayed a wrin-kled aspect of two centimeters long. Histological analysis afterbiopsy revealed oral mucosa with focus of intraepithelial leuko-cytes and chronic inflammatory infiltrate in the subjacent con-nective tissue. Two-week follow-up no alteration was observed.

However, one discovered that patient frequently rubbed his

tongue against his lower lip. Habit termination, avoiding hotdrinks, spicy food and applying of artificial saliva were recom-mended. One month later lesion was slightly increased and theguideline was kept. Then, total healing was observed and para-functional habit diagnosis was given.

RECONSTRUCTION OF BILATERAL MAXILLA WITHMICROVASCULAR FIBULA FLAP: VARIABLE IX SassiLM1,2,3, Pedruzzi PAG4, Guebur MI5, Silva AB6, DissenhaJL5, Groth AK7, Ramos GHA8, Oliveira BV9 - 1CHEFE DOSERVIÇO DE CIRURGIA BUCO-MAXILO-FACIAL, 2HOS-PITAL ERASTO GAERTNER DE CURITIBA, 3CHEFE DOSERVIÇO DE CIRURGIA BUCO-MAXILO-FACIAL DOHOSPITAL ERASTO GAERTNER, 4HOSPITAL ERASTOGAERTNER - SERVIÇO DE CIRURGIA DE CABEÇA EPESCOÇO, 5HOSPITAL ERASTO GAERTNER - SERVIÇODE CIRURGIA BUCO-MAXILO-FACIAL, 6UFPR; HOSPI-TAL ERASTO GAERTNER - SERVIÇO DE CIRURGIAPLASTICA, 7HOSPITAL ERASTO GAERTNER - CHEFE DOSERVIÇO DE CIRURGIA PLASTICA, 8UFPR; HOSPITALERASTO GAERTNER - SERVIÇO DE CIRURGIA DECABEÇA E PESCOÇO, 9HOSPITAL ERASTO GAERTNER -CHEFE DO SERVIÇO DE CIRURGIA CABEÇA EPESCOÇO

The experience of each surgical team counts a lot in suchsituations.

Objective: Rebuilding case submitted to bilateral maxillec-tomy because squamous cell carcinoma.

Method: Patient underwent maxillectomy with immediatereconstruction Microvascular fibula flap. two osteotomies wereperformed resulting in three bone segments to remake the alve-olar region of left anterior and right maxillary alveolar ridge,which were fixed together with titanium miniplates and fixedsegments the zygomatic bone with a titanium miniplate andscrews and one on each side. Is required at the ends of thesegments on each side with a fixing screw in a 90 ° angle with thesegment that has remade the trailing edge of the maxilla.

Results: The flap, and close the wound, provides a basis fororal rehabilitation by dental implants. After one year underwentdental implants and overdenture later.

Conclusion: The patient had satisfactory evolution, aesthet-ics, function and phonation were recovered.

EXTENSIVE JUVENILE OSSIFYING FIBROMA: A CASEREPORT Figueiredo LMG1, Oliveira TFL2, Valente ROH3,Costa WRM4, Almeida ECB5, Lisboa JFC6, Sarmento VA7,8 -1UNIVERSIDADE FEDERAL DA BAHIA - MESTRANDO-INSTITUTO DE CIÊNCIAS DA SAÚDE, 2FACULDADE DEODONTOLOGIA DE BAURU- USP - DOUTORANDA EMESTOMATOLOGIA, 3HOSPITAL GETULIO VARGAS -CIRURGIA BUCO-MAXILO-FACIAL, 4INSTITUTO DE ME-DICINA INTEGRAL PROFESSOR FERNANDO FIGUEIRA -CIRURGIA BUCO-MAXILO-FACIAL, 5UNIVERSIDADEFEDERAL DE PERNAMBUCO - DOUTORANDA EMCLÍNICA INTEGRADA, 6UNIVERSIDADE FEDERAL DEPERNAMBUCO - PROFESSOR ADJUNTO DE PATOLO-GIA ORAL, 7UNIVERSIDADE FEDERAL DA BAHIA - PRO-FESSOR ASSOCIADO DE ODONTOLOGIA, 8UNIVERSI-DADE ESTADUAL DE FEIRA DE SANTANA-BAHIA -

PROFESSOR TITULAR