Background: Salivary gland tumors are the most complex and diverse of any organ in the body. Assessing the pathological characteristics of salivary gland tumor, contributing to early diagnosis and effective treatment as well as avoiding tumor-induced complications is the focus of the study. Objective: To study clinical, paraclinical features and to evaluate the results of salivary gland tumor surgery. Materials and Methods: 41 patients with salivary gland tumor who were examined at Hue University of Medicine and Pharmacy from Jun 2019 to Jun 2020 were recorded about clinical, paraclinical and evaluated results 1 week, 1 month and 3 months after surgery. Results: Male cases were in the majority (58.5%), the mean age of patients was 52.4±12.4. Majority of the parotid gland tumor size in CT scanner encountered were between 2 and 4 cm (67.7%). Benign parotid tumors often had isodense 61.3%, clear boundaries and non - invasive surrounding. Pleomorphic adenoma was found the most often among the benign tumors at a ratio of 24.4%, followed by Warthin tumors (34.1%), with other types of benign tumors remaining. After parotid surgery, the most common complication was numbness around the earlope (77.4%), facial paralysis (41.9%), hemorrhage (29.1%), seroma (3.2%) and salivary fistula (3.2%). And after submandibular surgery, the most common complication was numbness around the wound (50%), hemorrhage (10%) and hypoglossal nerve damage was very rarely. Conclusion: FNA - Fine Needle Aspiration, Ultrasound and CT scanner were very valuable for diagnosis. Surgery was the main treatment method for salivary gland tumors. Key words: Parotid gland, parotidectomy, facial paralysis

Background: Parotid gland tumors account for 80% of all salivary gland neoplasms, but 80% of parotid tumors are benign. In the presence of a parotid mass, a physical examination is the first diagnostic tool and, in most cases, it guides the clinician in the appropriate direction. A fine needle aspiration biopsy (FNA) has been indicated by several authors for the diagnostic work-up. Ultrasonography, computed tomography, and/ or magnetic resonance imaging are useful complementary studies for proper surgical planning. Objective: Study clinical, paraclinical features of parotid gland tumor surgery. Materials and Methods: 31 patients with parotid gland tumor who were examined at Hue University of Medicine and Pharmacy Hospital from June 2019 to June 2020 were recorded about clinical, paraclinical of tumour. Results: Parotid salivary gland tumors in men account for 54.8, the mean age of patients was 53.7±12.3. Majority of the parotid gland tumor size in ultrasound were between 2 and 4 cm (67.7%), homogenous (67.7%). Majority of the parotid gland tumor size in CT scanner encountered were between 2 and 4 cm (67.7%), homogenous (61.3%) and in the superficial lobe (96.8). Preoperative fine needle aspiration biopsy (FNA) results showed 35.5% pleomorphic adenoma. Conclusion: FNA - Fine Needle Aspiration, Ultrasound and CT scanner were very valuable for diagnosis. Key words: salivary gland neoplasms, tumors

Background: The alveolar bone can be damaged by a variety of causes such as trauma, bone tumors and cysts, infection and tooth loss, affecting function, aesthetics, comfort and confidence of the patient. In order to reconstruct the alveolar bone defect, besides autologous bone, cellular and inorganic biological materials are being developed and widely applied including Biphasic Calcium Phosphate (BCP). Therefore, it is very essential to establish an animal model of alveolar bone defect to evaluate the progress of bone formation and the potential of materials before clinical application. Materials and Methods: The study was performed on 18 white, male, healthy rabbits weighing 2.5 ± 0.2 kg, 8-to-10-week aged, divided into 2 groups: group 1 (control), group 2 (BCP). The alveolar bone defect formation was performed in 2 groups, then reconstructed with BCP (group 2). Evaluation of soft tissue healing characteristics in 2 groups after 1, 3, 5, 7, 14 days after surgery and assessment of alveolar bone regeneration by X-ray and histological analysis after 2, 4, 6 weeks. Results: Healing score in each group increased gradually from day 1 to day 14, having statistical significance from day 5. Healing score of 2 groups tended to increase gradually in order: control group < BCP group (p > 0.05). X-ray scores in each group increased from week 2 to week 6, with statistical significance at week 6 (p < 0.05). X-ray scores of 2 groups tended to increase in order: the control group < BCP group (p > 0.05). New connective tissue formed in the control group reached the highest at week 4 and decreased after week 6 (p < 0.05). New bone formation in each group increased statistically from week 2 to week 6. The amount of newly formed bone in BCP group was significantly higher than in control group (p < 0.05). Conclusions: The above established model allows us to evaluate the capability of the bone regeneration of various materials. In addition, BCP is a potential material which can be used to reconstruct alveolar bone defects in patients

Background: Benign tumors account for 80% of parotid salivary gland tumors, early diagnosis and effective treatment will contribute to reducing complications of surgery. Objective: To evalutate surgical results of benign parotid tumors on facial paralysis and other complications. Research Methodology: including 51 patients with benign parotid salivary gland tumors at Hue University of Medicine and Pharmacy Hospital from June 2019 to October 2021 were operated on and monitored for facial paralysis after 1 week, 1 month, 3 months, and 6 months according to the House-Brackmann facial nerve grading system and noted other complications. Results: Pleomorphic adenoma and Warthin tumors are the two most common types of benign tumors. The rate of facial paralysis at the time points after 1 week, 1 month, 3 months, and 6 months gradually decreased by 56.9%, 35.3%, 19.6%, 0%, respectively. Most temporary facial paralysis grade II (mild) and grade III (moderate) (classification of House - Brackmann). The surgical method was significantly related to facial paralysis (p < 0.05). Other complications such as numbness around the ear, hemorrhage, sialocele, salivary fistula, depression of facial contour, bad scars. Nevertheless, no cases of tumor recurrence and Frey’s syndrome were recorded after 6 months. Conclusion: Surgery is an effective and safe treatment for benign parotid salivary gland tumors. Facial paralysis accounts for a high incidence after surgery, but it will fully recover after 6 months. Choosing the appropriate treatment method helps to minimize complications and recurrence after surgery of parotid salivary gland tumors. Key words: benign parotid tumors, facial paralysis, parotidectomy.

Background: Pleomorphic adenoma, accounting for 80% of all parotid benign tumors and associated with a high recurrence rate after surgery. Early diagnosis and effective treatment will contribute to reducing complications of surgery. Objective: Evaluation of surgical results of pleomorphic adenoma on facial paralysis and other complications. Materials and Methods: including 25 patients with pleomorphic adenoma who were operated at Hue University of Medicine and Pharmacy from January 2020 to December 2020 and evaluate complications after 1 week, 1 month, 3 months, and 6 months. Results: After surgery at 1 week, 1 month, 3 months, and 6 months, the rate of facial paralysis gradually decreased by 76%, 52%, 32%, 0%, respectively. After 6 months, 100% reaching grade I on the House-Brackmann scale. cervicofacial branches accounted for the highest rate (48%). Other common complications include numbness around the ear, hemorrhage, sialocele, salivary fistula. Nevertheless, no cases of tumor recurrence and Frey’s syndrome were recorded. Conclusion: Parotidectomy is an effective and safe treatment method of pleomorphic adenoma. Facial paralysis accounts for a high incidence, but it will fully recover after 6 months. Choosing the appropriate treatment method helps to minimize complications and recurrence after surgery for pleomorphic adenoma of the parotid gland. Key words: Pleomorphic Adenoma, Parotidectomy, Facial paralysis