Background : In 2005 the WHO reclassified the Odontogenic Keratocyst into Keratocystic Odontogenic Tumour (KCOT) due to its aggressive behavior and its high recurrence rate. Radiographically it can present as a unilocular or multilocular radiolucency. Thus, due to the fact that KCOT can radiographically mimic lesions with less aggressive characteristics, and when the objective is rehabilitation with dental implants it is necessary to take into account the pathological characteristics of these entities.Aim/Hypothesis : The purpose of this poster is to present a clinical case of an immediate implant after enucleation of a cyst in the edentulous área of 1.2, which was considered as innocent and came to be identified as a KCOT after anatomopathological examination.Material and Methods : In this clinical case, cyst lesion enucleation was performed in the edentulous region of 1.2 with immediate placement of a dental implant and regeneration with xenograft and reabsorbable collagen membrane. In addition, dental implants were placed in 1.3, 1.5, 1.6, 2.4 and 2.5. Orthopantomography showed a well defined radiolucent unilocular image superior to the roots of 2.1 and 2.3 and absence of 2.2.Initially it was treated as a residual cyst. Histopathological examination revealed a KCOT. After 6 months of osseointegration the dental implant was rehabilitated with screwed crown.Results : With a 3-years follow-up, the patient is free of disease. No evidence of recurrence. Conclusion and Clinical Implications: With this clinical case, the authors emphasize the need for a cautious approach of maxillary lesions even when they present non-aggressive aspects and non-aggressive behaviors, especially when the objective is the rehabilitation with dental implants.

Background : Millions of people around the world are toothless. Edentulism has an impact on the individual ' s personal and social life. With the increase of life expectancy, the number of total edentulous people also increases. Total removable dentures are rehabilitations associated with a discomfort and social and personal problems. The development of osseointegrated dental implants allowed patients to have trust and Comfort with removable dentures.Aim/Hypothesis : The purpose of this study was to evaluate the oral health-related quality of life of patients treated with implant-supported overdentures and the success rate of the implants used, in a dental unit center (UMD CCL -SSCGD), in Lisbon, Portugal.Materials and Methods : From a total of 49 patients (165 implants) treated with removable dentures supported by dental implants (BTI Biotechnology Institute -Spain) from 2016 to 2018, 29 patients were selected. All patients answered two OHIP-Edent Portuguese version questionnaires (one on the pre-implant and one after implant placement), the surgeries were all performed by the same oral surgeon and rehabilitated by the same Dentist with removable implant-supported prostheses, by six or two implants through the Locator system. The total number of implants was 127. The associations between the OHIP-Edent variables and the patient ' s age, gender, associated pathology and the number of implants supporting the overdenture, as well as the survival rate of the implants were evaluated.Results : A total of 127 implants were placed in 29 patients. The average number of implants per patient is 4.3. 27.6% of patients were rehabilitated with bimaxillary prostheses, 27,6% with maxillary prosthesis and 44,8% with mandibular prosthesis. 6 implants failed (4,72%) -3 implants failed because fibrointegration and the others 3 implants failed because of a postoperative infection in a 70 years older polymedicated patient with diabetic, hypertension and allergy to penicillin. Comparing the results of the two questionnaires (before and after treatment) patients treated with implanted-supported removable denture showed a significant statistical increase in their quality of life. Conclusion and Clinical Implications: Implant overdentures is a predictable treatment and a good option for edentulous patients to whom a fixed rehabilitation treatment is not na option and do not support traditional removable prostheses.

Background : Oral rehabilitation with dental implants is conditioned by the bone available and by the presence of anatomical structures which conditionate the size of dental implants. The use of short and ultrashort implants avoids extra surgical procedures and eventual complications.The definition of short implants has been changed successively. The last European BDIZ EDI consensus in 2016 defined short implants for those smaller 8 mm in size and ultrashort implants smaller than 6 mm in size Aim/Hypothesis : The aim of this study is to determine cumulative survival rate of short and ultrashort dental implants (BTI Biotechnology Institute -Spain), in a dental unit center (UMD CCL -SSCGD), in Lisbon, Portugal Materials and Methods : A retrospective study design was adapted. From a total of 388 patients with a 675 short and ultrashort dental implants over 3 years period (2016 to 2018), we selected 144 patients (60 woman 84 men) with 248 short and ultrashort dental implants placed by the same oral surgeon and rehabilitated by the same restorative dentist. 67.7% of implants are 8.5 mm length, 23% are 7.5 mm length, 8.1% are 6.5 mm length and 1.2% are 5.5 mm length. The follow-up varies from 3 months to 3 years Results : In this study the survival rate is 97.5%. 114 implants (45.97%) were placed in 60 female patients (41.7%) and 134 implants (54.03%) were placed in 84 male patients (58.3%). The mean age was 61.2. 6 implants failed (2.5%). 3 of these 6 implants were not placed because of lack of primary stability. The other three, one failed for late infection in the osseointegration phase and the other two failed because fibrointegrated (one in a total maxillary provisional bridge immediate loading and other one a single crown in maxilla with a implant-crown ratio of 3-1 and after 11 months of rehabilitation). Conclusion and Clinical Implications: Within the limitation of the study the use of short and ultrashort implants seems to be a good alternative treatment to regenerated surgery.

Background and Aim Methods and Materials

Background : Dental implant placement in osteofasciocutaneous free fibula flaps (OSCFFF) presents a special clinical challenge in implantology. Extensive vertical height loss caused by bone resorption, with a consequential width and height reduction of the alveolar ridge, remains a frequent problem and is often considered a major drawback. Because of the structural diversity, drilling into OSCFFF can be demanding. Often it is difficult to achieve primary stability of the implants, and therefore pre-surgical implant placement planning is necessary. As patients in need of OSCFFF represent a therapeutically demanding group of patients, even when satisfying dental implant osseointegration is achieved, it is not easy to obtain a satisfactory long-term oral rehabilitation.Aim/Hypothesis : To show advantages and the importance of pre-surgical planning in patients in need for mid-facial reconstruction using OSCFFF. We present a 10-year follow-up OSCFFF reconstruction case in which the importance of interdisciplinary cooperation between maxillofacial surgeons, oral surgeons and prosthodontists is shown.Materials and Methods : A female patient had undergone total medial maxillary reconstruction 10 years ago, due to the gingival squamous cell carcinoma. Radiotherapy had not been performed and two years after she had no signs of recurrence. Four 3.5 × 11 mm dental implants (Ankylos Dentsply Implants, Germany) were placed in the regions of the second incisors and first premolars. One year after, vestibuloplasty was performed and four osseointegrated implants were opened. Due to the absence of hard palate tissue, a bar retained reduced total prosthesis was placed. Patient was satisfied with the end-result and after 8 years she came to replace the prosthesis. A control panoramic x -ray was taken which showed no bone resorption around the implants.Results : After 10 years, satisfactory functionality and esthetics of the implant-prosthetic reconstruction in OSCFFF graft were observed. Conclusion and ClinicalImplications : OSCFFF presents a valuable technique for major facial reconstructions. After inserting dental implants in OSCFFF reconstructed jaws, the healing period should be extended from 9-12 months. Vestibuloplasty is recommended before placing the dentures. Dental implant placement in OSCFFF presents a valuable solution for major dentoalveolar defects.