The pleomorphic adenoma (PA) or mixed tumor is the most common neoplasm of the salivary glands, usually presenting with a non-specific clinical manifestation and a diverse histopathological pattern. The region of the lips is the second most common site for minor gland neoplasms. The aim of this paper is to report the case of a 39 year old caucasian woman presenting with a swelling on the right side of the upper lip combined with a history of trauma in the region of the upper right central incisor, eight years ago. The swelling was attributed to the periapical lesion of the upper right central incisor that was observed on the orthopantomography. Intraoperatively the surgeon came upon a nodule of firm consistency in the mucolabial fold. The histopathologic diagnosis of this lesion was benign mixed tumor of salivary gland. This report discusses the deviation in frequency of mixed salivary gland tumor between upper and lower lip, the clinical differential diagnosis, the histopathological pattern and the appropriate treatment.

Intraoral approach for the removal of impacted third molars represents a common surgical procedure for the specialized clinician. However, in some cases such as ectopic third molars, extraoral surgical removal seems to be inevitable. We present a step by step case of a 56 year old woman with an ectopic third molar of the lower jaw along with a cystic lesion, which were surgically removed by a submandibular approach. Postoperative clinical course was uneventful and there were no signs of facial nerve paresis. In such cases, appropriate preoperative planning must be made based on careful study of radiographic imaging and clinical examination. The more conservative technique that would minimize adjacent anatomic structures risk should be the surgical technique of choice. Key words: Ectopic third molar, mandible, cyst, extraoral approach.

Introduction: Bone regeneration techniques are essential prior to dental implant placement in cases of mandibular or maxillary bone deficit. Depending on the area and the extent of bone loss, as well as the type of prosthetic rehabilitation to be applied, different bone regeneration techniques can be used. Aim: The scope of this study is to analyze a series of patients that underwent mandibular or maxillary bone regeneration, in effort to highlight the most widely used techniques and their outcome. Materials and Methods: 358 cases that underwent max- illary or mandibular bone regeneration in an oral and maxillofacial private clinic within the last 5 years are thoroughly analyzed retrospectively in terms of various parameters from their demographic and medical re- cords, the type of bone regeneration technique that was applied and the final bone augmentation and implant osseointegration outcome. Results: The most widely used technique for bone re- generation was GBR (n=184, 51.3%), followed by sinus floor elevation (n=162, 45.3%) and autologous onlay bone block grafts (n=12, 3.4%). In 1 case of GBR with a non-resorbable membrane, membrane exposure was noted. In 5 cases of sinus lift, inflammation occurred. In one case with bone block grafts from the iliac crest, inflammation presented a few weeks after surgery and one of the bone blocks was partially resorbed. Conclusions: GBR with a resorbable membrane barrier and sinus lift appears to have the most predictable outcomes in terms of mandibular or maxillary bone augmentation.

Background : 3D-printing is a method of 3-dimensional object production via melting or deposition of plastic, ceramic, liquid or even living cells. Three types of printers exist. The 1st uses LASER for the peripheral formation of an object and then creates the bulk of the object by adding layers of the material. The 2nd uses thermic piezo-or electromagnetic radiation for deposition of ink droplets or other material, according to a digital model. The 3rd uses heated plastic that is cooled down during its exit. Aim/Hypothesis : The purpose of this poster is to present clinical cases where the mandible was reconstructed with a patient-specific pre-bent titanium reconstruction plate, with the use of 3D printing technology. Materials and Methods : In this study, five cases where 3D-printing for mandible reconstruction after segmental mandibular resection or marginal osteotomy were applied, are presented. Three cases concern segmental mandibulectomy and two cases concerns marginal osteotomy. Out of the mentioned cases, one involves an osteosarcoma of the mandible, one involves an ameloblastoma of the mandible, two involve a squamous cell carcinoma of the buccal mucosa and the mandible and one involves a squamous cell carcinoma of the sublingual area and the mandible. All the cases involving squamous cell carcinoma underwent cervical lymph node resection, as well. Results : The patient-specific pre-bent titanium plates were excellently matched with no visible gaps between plates and the bone surface. No additional intra-operative plate bending was required. No adverse events were recorded during or after the operation. The overall intraoperative and postoperative success rate was 100%. The facial appearance and aesthetic outcomes were acceptable based on the objective judgment of the surgeons and the subjective reports of the patients. During follow-up, the occlusion was evaluated by intercuspal position and no significant changes were identified. Conclusions and Clinical Implications : Reconstruction with 3D-printed titanium plate following segmented or marginal mandibulectomy is an optimal method, due to its precision during surgical planning and restoration, which eventually leads to the reduction of the surgery duration and the optimal rehabilitation of the patient.

Background : Alveolar ridge split technique (ARST) is a surgical procedure performed for horizontal ridge augmentation in cases of narrow crestal ridges. It is a biologically oriented technique, taking advantage of the osteogenic and osteoconductive dynamic of the native bone. Recently, the utilization of devices such as thin diamond disks or piezoelectric cutting devices has enhanced ARST success rate, reduced surgical time and patient ' s morbidity, regardless of bone quality. Aim/Hypothesis : The purpose of this poster is to present and discuss our experience in a series of clinical cases where ARST was performed for horizontal bone augmentation with simultaneous implant placement, using classical or piezoelectric-assisted surgical procedures. Materials and Methods : ARST was performed in 6 patients with 10 sites of horizontal defects. Under local anesthesia, a crestal incision was performed and a full thickness mucoperiosteal flap was reflected. Initial osteotomy was done using the classical technique in 6 cases (diamond disk, rotary burs), while a piezoelectric device was used to the remaining 4 cases. Osteotomes and chisels with gradually increasing dimensions were used to expand the alveolar ridge to facilitate the immediate placement of 18 implants, approximately 2 mm subcrestally in order to prevent marginal bone loss. The remaining space between bony plates was filled with allograft or xenograft and covered with collagen membrane in 9 cases, while in one case no bone graft or membrane were used. Primary closure without tension was achieved with periosteum releasing incisions of the buccal flap. Post-operative instructions included administration of antibiotic and analgesic, chlorhexidine solution, smoke cessation and thorough oral hygiene. Results : Sutures were removed 10 days postoperatively. Follow up was uneventful for 5 out of 6 patients. One patient did not comply with the postoperative instructions, applying poor oral hygiene and continuing smoking as before which resulted in exposure of the collagenmembrane the second week, leading to secondary wound closure compromising the augmentation. A new CBCT was performed 4 months following the split which revealed successful bone augmentation and implant osseointegration without any significant bone loss around the implants. Oral rehabilitation with either fixed or removable prosthetics was accomplished and the patients remain under systematic review. Conclusions and Clinical Implications : ARST is a predictable and reliable procedure characterized by its low invasiveness and morbidity. The major advantage is the simultaneous bone augmentation-implant placement, which provides reduced treatment time and cost. Piezoelectric devices make the split technique easier and safer, decreasing the risk of complications in the treatment of extremely atrophic crests. ARST ' s success and efficacy depends greatly on patient selection in order for the basic anatomical criteria to be fulfilled.