ABSTRACT
@#Dental implants are valuable devices for restoring lost teeth. At this moment, nanotechnology has emerged with several techniques to modify implant surfaces. In addition, some evaluation techniques at the nano level are contributing important information regarding tissue and cell interactions with the implanted material. The purpose of this study was to analyze and compare the bone responses to 3 different types of 4.1-mm-diameter, 10mm-long implant surfaces on a dog femur model: 1) Sand blasted with alumina and Acid etched (SA), 2) Resorbable blast media (RBM), functioning as control groups, and 3) Anode oxidation nano-titana (Anodized TiO2) surface implants as experimental group. For this study, implants were placed in 3 beagle dogs (age, 18 months; weight, 11-14 kg). Their purchase, selection, management, and experimental procedure were carried out according to established conditions by the Department of Laboratory Animal Medicine, Medical Research Center, Medical College of Yonsei University. Nineteen turned screw-shaped implants with 3 different surfaces (4.1mm in diameter, 10mm in length) were made from commercially pure titanium (grade IV). Thirteen implants were placed in each beagle dogs no. 1 and 2 and six implants were placed in the remaining beagle dog. Implants placed in beagle dogs no. 1 and 2 underwent histology analysis, X-ray and CT taking, and analysis of relative bone mineral density with Dataviewer program. While removal torque was measured in the implants placed in beagle no. 3 after a healing period of 4 and 8 weeks. A histological evaluation of the specimens in this study showed that osseointegration was achieved for all control and experimental group after a healing period of 4 and 8 weeks. The following means were obtained for bone-implant contact (BIC) percentage for 4 and 8-week groups, respectively: SA: 85.16%, 38.88%; RBM: 41.62%, 58.87%; and Anodized TiO2: 43.85%, 61.3%. The following means were obtained for bone volume (BV) percentage for 4 and 8-week groups, respectively: SA: 34.48%, 51.55%; RBM: 58.56%, 81.56%; and Anodized TiO2: 47.22%, 63.53%. In this study, 8-week consolidated Anodized TO2 surface implants showed increased removal torque value (RTV) compared to that of the 4-week group. The obtained RTV means were 86.0 and 99.7Ncm, respectively, for 4 and 8-week Anodized TiO2 implants. The present study showed that osseointegration occurred in all investigated types of surface-treated implants. However, the control groups showed slight increase in the BIC and BIV values compared to the experimental groups. Therefore the clinical relevance of the observed results remains to be shown.
ABSTRACT
Myofibroblastic sarcoma is a rare tumor that mostly develops in the soft tissues of the head and neck. Within the oral cavity, a tongue lesion is the most common. A myofibroblastic sarcoma tends to recur locally instead of metastasizing. We encountered a myofibroblastic sarcoma of the mandible of a 9-year-old male and performed mass excision and additional marginal alveolectomy. So far, there is neither recurrence nor metastasis. We report this case because of the uncommon location of this tumor type and its surgical approach compared to other forms of sarcomas.
Subject(s)
Child , Humans , Male , Alveolectomy , Head , Mandible , Mouth , Myofibroblasts , Neck , Neoplasm Metastasis , Recurrence , Sarcoma , TongueABSTRACT
A keratoameloblastoma is a histologically variant of the ameloblastoma group, which varies in size and contains keratin material in the fibrous connective tissue among cystic lesions. A keratoameloblastoma is a rare disease with only 13 cases reported in the literature since Pindborg's first report in 1970. A 41-year-old man visited, complaining of pus discharged from the right maxilla. He had been diagnosed with an odontogenic keratocyst and was treated with cyst enucleation in the past. The clinical and radiology examination found evidence of recurrence and finally diagnosed him with keratoameloblastoma after enucleation and biopsy. This report discusses the clinical, radiological and histological characteristics of keratoameloblastoma and its treatment. In addition, we report another case of keratoameloblastoma that had transformed from an odontogenic keratocyst.