No abstract

Membranes that aid the guided bone regeneration (GBR) process have been the subject of studies of compatible biomaterials that contribute to this repair process. The present study compared different membranes used in critical-size defects of rat calvaria by assessing GBR as well as histological, histomorphometric, and immunohistochemical reactions. Forty-eight male albino Wistar rats were randomly allocated into four groups (n = 12 each), namely, C: membrane-free control group (only blood clot, negative control group); BG: porcine collagen membrane group (Bio-Gide®, positive control group); GD: bovine cortical membrane group (first experimental group); and GDF: thicker bovine cortical membrane group (second experimental group). Rats were euthanized at 30 and 60 days postoperatively. Quantitative data from the histometric analysis were submitted to two-way ANOVA and Tukey’s posttest when p<0.05. Histomorphometric results of the thicker bovine cortical membrane at 30 and 60 days were promising, showing improved new bone formation values (p<0.05), and the CD group presented similar results in both analysis periods, being surpassed only by the GDF group (p<0.05). The immunohistochemical results were associated with the histomorphometric data. A less-thick membrane also assisted in GBR. All membranes promoted GBR, especially the positive control and experimental groups.

The ameloblastic fibro-odontoma (AFO) is a mixed odontogenic tumor, with characteristics of ameloblastic fibroma, presenting enamel and dentin, which occurs more frequently in individuals aged 5 to 17 years. This paper reports na extensive case of ameloblastic fibro-odontoma in the mandible of a 3-year-old patient, discussed in comparison to cases selected from a brief literature review on the clinical characteristics, Evolution and therapeutic options for this lesion. In the last years, there was no consensus in the literature concerning its etiopathogenesis and classification, yet recently the AFO was classified as a developing odontoma. This case is in accordance with the 7 cases reported in the literature of AFO in the mandible of children aged 10 years or younger, especially concerning the lesion pattern and evolution and treatment adopted. The patient did not present relapse and exhibited local bone regeneration at the 3-year follow-up.

Aim:To report the rehabilitation of a female patient, 40 years old, with a microstomia.Case Report: The Z-plasty surgery was performed in the region of the labial commissure to increase the mouth opening. In the mandible, two implants were installed in the interforaminal region and an overdenture with bar/clip attachment system was made. The maxilla was atrophic, with the presence of two bone sites in the intermaxillary suture region: the first one anterior to the incisive foramen and the second one in the middle of the hard palate. Two implants were placed without a graft in those sites. The conventional maxillary denture was converted into an overdenture with ball attachments system. Conclusion:Based on the presented case, with a 2-year follow-up, it can be concluded the validity of the use of the techniques of surgeries to increase the mouth opening, implants in intermaxillary suture and overdentures as rehabilitation therapy for patients with microstomia.