INTRODUCTION: Dental retentions and cysts are common pathology necessitating proper surgical treatment. During the recent decade, platelet-rich plasma has increasingly been used in oral surgery. AIM: Our aim was to illustrate its application alone and in combination with autologous bone or collagen in patients after odontectomy for dental retenion and cystectomy for dental cysts. MATERIALS AND METHODS: A total of 53 patients, 28 males and 23 females, with retained molars or dental cysts were diagnosed and surgically treated between May 2017 and May 2019. Odontectomy was carried out in 36 pateints and cystectomy-in 21 ones. According to an original protocol of platelet-rich plasma preparation, it was applied alone in 21, along with autologous bone-in 14, and combined with collagen-in 19 patients. RESULTS AND DISCUSSION: The comparison with a sex-and age-matched control group without such applications demonstrated certain advantages in terms of the positive effects of platelet-rich plasma on wound healing, pain perception and bone regeneration. CONCLUSION: Further research is needed to more comprehensively assess the benefits of these growth factors in oral surgery.

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AIM:The aim of this research is to demonstrate the necessity of CBCT -examination for evaluation of the surgical approach of high-risk impacted lower third molars. As "high-risk" we defined lower third molars which have signs of proximity to the mandibular canal seen on standard panoramic radiography. MATERIALS AND METHODS:All patients who had undergone a CT examination between September, 2015 and October, 2016 were reviewed. We included images from cone beam computed tomography made in the Department of Radiologic Diagnostics, University Medical and Dental Centre of the Medical University of Varna. The device used was Planmeca ProMax 3D Max with software for images Planmeca Romexis. We chose 100 images randomly. From these images we selected 39 images with high-risk lower third molars. We examined different signs with which we defined the exact position to the mandibular canal of 60 wisdom teeth and we managed to asses the risk of damaging the IAN during a classical odontectomy of these teeth. In the research we included the panoramic radiographs of 20 patients from these 39 cases. RESULTS:From the examination of the CBCT images we found: 28 lower third molars where the mandibular canal runs apical and has contact; 11 where the mandibular canal runs apical in contact with the tooth and penetration of the apices of the tooth is seen; 10 where the mandibular canal runs buccal with contact; 8 where the mandibular canal runs lingual with contact; 3 where the mandibular canal runs between the roots touching one/both of them. In three of the cases we found severe deviation of the root apices.From the examination of the panoramic radiographs we found: 5 cases with darkening of roots in the apical area; 8 with interruption of the white line (lamina dura) of the mandibular canal; 1 with diversion of the mandibular canal with/without narrowing of the mandibular canal; 6 without any of these three signs. CONCLUSION:The development and rapid commercialization of new technologies like CBCT allows us to have precise images and exact diagnosis of the diseases in the oral and maxillofacial area.Our study confirmed the high diagnostic value of CBCT regarding to precise the position of the lower third molars to the mandibular canal and IAN.