Aim: This study is aimed to evaluate the importance of collagen fi brils in the adhesion of diff erent self-etching adhesive materials to dentin. Methods: Sixty Class V restorations were prepared on the buccal and lingual surfaces of 30 recently extracted human premolars, with the cervical margins in dentin and the occlusal margins in enamel. These restorations were distributed to three groups of 20 cavities each based on the employed adhesive system used: Group A: G-Bond (GC, Corporation Tokyo, Japan); Group B: Xeno V (Dentsply Caulk Milford, DE, USA); Group C: Adper Easy One (3M/ESPE). Each group was subdivided according to dentin treatment: Subgroup 1-manufacturer's adhesive protocol and Subgroup 2-Removal of the collagens fi bers (total etch + sodium hypochlorite 5% for 2 min) + adhesive protocol. After the restorations, the teeth were subjected to thermal cycling, washing and scoring according to dye penetration. Dye penetration was evaluated using steriomicroscope. Results: When the dentin microleakage scores were compared in subgroups A1VsA2, B1VsB2 and C1VsC2, then Mann-Whitney test revealed signifi cant diff erences between Subgroup A1 and Subgroup A2 (P < 5%). There was no signifi cant diff erence in Groups B and C. Conclusion: The results revealed that the collagen fi brils are not required for adhesion, and their removal improves the marginal seal of G-Bond, an acetone based dentin bonding system.

Central giant cell granuloma (CGCG) is an intraosseous lesion which occurs as an uncommon benign condition in jaws. World health organization defines this intraosseous lesions as "a lesion that contains multiple foci of hemorrhage," consisting of cellular fibrous tissue, and there is trabeculae of woven bone. It may become aggressive leading to expansion and perforation of the cortex. Mobility and displacement of the involved teeth and root resorption are often observed. Here is a case report of an 18-year-old female patient who is diagnosed with an aggressive type of CGCG.

Basaloid squamous cell carcinoma (BSCC) is an uncommon and severe variant of squamous cell carcinoma (SCC). The tumor arises most commonly in the region of the head-and-neck. It is normally seen in the epiglottis, pyriform fossa, and the base of the tongue. It also occurs less frequently in areas like the palate, buccal mucosa, gingiva and the floor of mouth. Once compared to SCC, BSCC is documented for its aggressiveness in the head-and-neck area, along with its recurrence in local and cervical lymph nodes for its distant metastasis to the lungs. In addition, local lymph nodes are more common in regular recurrence rates. BSCC in the head and neck is more likely to spread to other parts of the body. It has an increased tendency to metastasize when compared with other tumours. We report a rare case of a BSCC arising in the buccal mucosa in a 65-year-old male patient and explain its clinicopathologic characteristics.