It is important to stress that challenges to microscopic diagnosis include biphasic differentiation of salivary gland tumors even to the point of hybrid tumors with features of two different, well-defined tumor entities.14 With few immunohistochemical markers available for differentiation of tumors, truly accurate diagnosis of minor salivary gland tumor may be quite difficult. In order to help the histopathological diagnosis, we decided to use the immunohistochemistry. Such data have demonstrated strong positivity for calponin antibody (Figure 3), a marker of myoepitelial cells, and cytokeratin (Figure 4), an immunomarker for epithelial cells. Therefore, this emphasizes its epithelial and glandular origin. Most studies have shown that minor salivary gland tumors are more common in females than males with a male-to-female ratio ranging from 1:1.

02 to 1:2.0.2 Moreover, major studies have also reported that the palate was the most common site for minor salivary gland tumors and that approximately 40�C80% of all tumors occurred in this site.1 In this case, the patient was female and the upper lip was the site of involvement of basal cell adenoma. Altogether, this report supports the belief that the precise identification of lesions in the upper lip is important, particularly because basal cell adenoma has a potential to malignancy, as for example the conversion to basal cell adenocarcinoma.
Vertical alveolar distraction osteogenesis (ADO) has received considerable interest in terms of an extremely resorbed edentulous mandible as a way to augment bone prior to implant placement.

Compared with the conventional techniques of bone grafting and guided bone regeneration, ADO offers the advantages of decreased bone resorption, a lower rate of infection, and no donor site morbidity;1,2 also, tissue is gained.1,3,4 Disadvantages consist of the difficulty in controlling the segments, a lack of patient cooperation and the need for more office visits, and the cost of the device.5�C8 Common complications related to distraction osteogenesis are basal bone or transport segment fracture, fixation screw loss, nonunion, premature consolidation, wound dehiscences, lingual positioning of the transport segment, resorption of the transport segment, excessive length of the threaded rod, neurological alterations, and distractor fractures.

7,9�C11 In addition to these complications, the irritation of the oral mucosa on the opposite jaw caused by the distractor rod can be mentioned. The purpose of this study is to introduce a simple appliance to prevent distractor fracture and the irritation caused Brefeldin_A by the distractor rod. CASE REPORT A 60-year-old woman, who was completely edentulous in both the maxilla and mandible, was referred to our clinic with a complaint of poor retention of her conventional lower denture. Clinical and radiographic examinations revealed severe atrophy in the mandible.