Tooth fragment reattachment through the use of a nanofilled composite resin.

AIM: The purpose of this study is to evaluate resistance to fracture with static tests of dental fragments reattached through the use of different light-curing composite resins. For this purpose 40 bovine inferior incisors were utilised, which were randomised into 4 groups; one control group and 3 experimental groups. MATERIALS AND METHODS: All teeth of the 3 experimental groups were sawed at 3 mm from the incisal margin, and the respective fragments were then reattached utilizing different composite resins: in group 2_EI the hybrid composite Tetric EvoCeram (Ivoclar Vivadent AG) was used, in group 3_ZI the hybrid composite FiltekTM Z250 (3M ESPE) was used, and in group 4_SN the nanofilled composite FiltekTM Supreme (3M ESPE) was used. After reattachment, on each tooth were performed a chamfer on the buccal surface and an overcontour on the lingual surface along the fracture line, which were then filled with the composite resin corresponding to the respective group. Finally, all teeth were embedded in plaster blocks, and a force was applied on the buccal surface. RESULTS: All teeth in groups 2, 3, and 4 showed a significant loss of resistance to fracture compared to the teeth of the control group (P<0.0001). Resistance to fracture of the teeth belonging to groups 2_EI and 3_ZI was 37.35% and 47.35% of that of intact teeth respectively; in group 4_SN resistance to fracture reached 60.05%. Teeth of group 2 exhibited values of resistance to fracture statistically significant from those of group 4 (P=0.024), but no difference was found between group 2 and group 3 (P=0.298). The difference in resistance between group 3 and group 4 was not statistically significant (P=0.199). CONCLUSION: Static test showed that reattachment of coronal fragments do not restore resistance to fracture to the value of intact teeth. Resistance to fracture in in vitro studies is influenced by the type of composite resin utilised.

Solitary neurofibroma of the palate. A case report.

The neurofibroma is a benign tumor of neuronal origin not frequently located in the oral cavity. The possible association of this neoplasia with systemic pathologies, such as Von Recklinghausen's disease and multiple endocrine neoplasia, makes its diagnosis fundamental. The diagnosis is, in most cases, quite complex, because of the neurofibroma's strong similarities with a great number of benign neoformations of the connective tissue, of the epithelium, and of the bone. The histology represents, therefore, the fundamental diagnostic criterion, in particular, through the use of appropriate immunohistochemical analysis. This articles presents the case of a solitary neurofibroma, subtype I (common Schwann cell type), detected on the left-hand side of the posterior region of the palate in a 56-year-old woman, which presented itself as an otherwise non-symptomatic ulcerated mass. After a careful anamnesis, an incisional biopsy was performed in order to establish the histological nature of the neoformation. The immunohistochemical test, which resulted positive for S-100 and negative for the epithelial membrane antigen and keratin, allowed the diagnosis of a presumably benign lesion deriving from a neural differentiation. The surgical excision of the entire mass was accompanied by the extraction of the upper left-hand second molar, which was attached to the mass through its palatal root.