Background: Radical cysts are the most common inflammatory odontogenic cystic lesions that can be treated by Marsupialization, especially if the cyst is large and has vital structures. There are a few things to consider when treating a growing patient with an odontogenic cyst. Marsupialization has more benefits for the growing patient than enucleation to overcome treatment morbidity, such as damage to vital structures, bone loss, jaw growth disorders and pathological fractures. Purpose: This article reports on the success of marsupialization of odontogenic cysts "that have been associated with very decaying deciduous molars" to reduce treatment morbidity and to discuss enucleation in young patients. Materials and Methods: A healthy 9 patients with average age of 8 years old with unilateral radicular mandibular cysts. Marsupialization was done before the end of cyst enucleation incorporating a multipurpose space maintainer. Results: Periodic contraction of the cysts was observed in all patient cystic site. The position of the cyst wall was placed superficially and an enucleation was performed. The treatment result was satisfactory with low morbidity. Conclusion: Marsupialization with a versatile space maintainer for the odontogenic periapical cyst in growing patients has more advantages than enucleation in reducing treatment morbidity.

Aim:The purpose of this study was to evaluate the efficacy of the (PRF) combined with collagen membrane in the management of gingival recession compared to the use of (PRF) alone. Subjects and methods: 10 sites including at least one tooth with Miller's class II or class III buccal/labial gingival recession defect after phase I therapy were divided randomly into 2 groups, Group (I) was treated with open flap surgery while using (PRF) and Group (II) was treated with open flap surgery while using (PRF) combined with collagen membrane. Clinical parameters were recorded at baseline, 3and 6 months postoperatively. Results: both treatment groups showed no significant root coverage, Probing sulcus depth (PSD) reduction, Clinical attachment level (CAL) gain 6-months after surgery when compared with baseline between two groups. However, there was a significant increase of Height of keratinized gingiva (HKG) between (Group I) and (Group II) at 3-months and 6-months. Conclusion: Both the treatment modalities proved to be effective techniques in treatment of root coverage and Using of PRF + Collagen membrane showed superior effect compared to PRF alone, suggest that PRF + Collagen membrane can provide additional benefits not in the treatment of gingival recession but in increasing of the width of attached gingiva Gingival recession can be categorized using Miller's classification. This classification remains the most widely employed system for local recession defects. It is based on the morphological evaluation of the defect and the likelihood of achieving full or at least partial root coverage following surgery. Class I and class II recession defects of less than 5 mm have been shown to be favorable for complete root coverage. Class III recession defects have a poor prognosis for complete root coverage. When dealing with class IV defects, root coverage is unlikely to be achieved (2) .

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Tatum [2] described the enlargement of the maxillary sinus for the insertion of implants in this region for the first time. This surgical procedure allows the implant to be placed by increasing the height of the alveolar bone in this area. A variety of graft materials have been used to enlarge the bottom of the maxillary sinus. Autogenic bone grafts are considered the gold standard because they are not immunogenic and have osteogenic, osteoinductive and osteoconductive properties [1, 3-6]. However, there are several disadvantages, including donor site morbidity, lameness when the graft is removed from the iliac crest, prolonged healing time, second surgery, the need for general and hospital anesthesia, higher treatment costs, and unpredictable absorption of the graft [7, 8]. These disadvantages have led to the search for suitable graft materials, which are a biocompatible, and osteoinductive or at least osteoconductive alternative to autogenous bone replacement in the procedure for enlarging the sinus floor. Various bone graft materials such as alloplastics (hydroxyapatite, b-tricalcium phosphate and bioactive glass) [9-14] , xenografts (bovine or coral hydroxyapatite) [15-20] , or allografts (freeze-dried demineralized bone) [21] are currently in use as an alternative or supplement to autogenous bone. These biomaterials serve as a scaffold for additional bone formation. However, bone reconstruction is slower than with autogenous bone grafts [22]. Coral hydroxyapatite (CHA), a type of xenograft, has proven to be a safe and biocompatible bone graft material with osteoconductive properties [23-25]. In addition, several experimental and clinical studies have shown positive results with CHA graft materials in augmentation of the maxillary sinus floor [22]. Another popular graft material that has shown promising results with osteoconductive properties is beta-ABSTRACT Background: Choosing augmentation equipment is a critical factor in maxillary sinus augmentation. The choice of one of these materials for sinus augmentation remains controversial. Purpose: The aim of this clinical study was to compare the biological performance of the new coral hydroxyapatite (CHA) graft material and the synthetic material made from tricalcium phosphate (b-TCP) in sinus augmentation. Materials and Methods: The study consisted of 20 patients (10 men and 10 women) who were edentulous or partially edentulous in the posterior maxilla and required the placement of implants. A total of (20) sinus transplants were performed in a single step using implant installation procedures. CHA was used in 10 patients and b-TCP in 10 patients. Results: An average increase in the height of the mineralized tissue of 7.1 ± 1.1 mm in the b-TCP group and 4.6 ± 1.17 mm in the CHA group was when comparing the preoperative CT scan with that after 9 Months. After the maxillary sinus augmentation procedure. The average percentage of the density of the transplanted area after 9 months, based on the initial alveolar ridge density at the implantation site, was 63.6 % ...

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