Comparison of piezosurgery and conventional rotary instruments in schneider's membrane sinus lifting: A pilot randomized trial.

BACKGROUND: The present study aimed to evaluate and compare the postoperative effects of the piezoelectric device and conventional rotary instruments in Schneider's membrane sinus lifting procedure. MATERIAL AND METHODS: Twenty patients requiring bilateral maxillary bone graft augmentation in the posterior maxillary region were selected. Piezoelectric surgery was performed on one side and conventional surgery with a rotary diamond bur on the other. Postoperative pain, swelling, edema, and mouth opening were evaluated at one hour and two and seven days after the procedures. All variables were submitted to Friedman or Wilcoxon tests at a 5% significance level. RESULTS: The comparison between groups showed that postoperative pain after one hour and two days was significantly lower (p< 0.05) in the piezoelectric device group. Regarding the edema, the results of both techniques were similar at all times assessed (p> 0.05). Piezosurgery was statistically associated (p< 0.05) with greater mouth opening only at the 48-hour evaluation. CONCLUSIONS: Osteotomy with a piezoelectric device causes less pain and greater mouth opening postoperatively compared with the conventional technique. Key words:Piezosurgery, sinus lift, edema, pain, rotative instruments.

Prevalence of human papillomavirus in squamous cell carcinoma of the tongue.

Oncogenic human papillomaviruses (HPVs) are important agents in the genesis of gynecological cancer, and have also been implied in the genesis of oral cancer. With the purpose of evaluating the relationship between HPV and squamous cell carcinoma (SCC) of the tongue, a case-control study was performed. Fifty white male patients who were smokers and had the histological diagnosis of SCC of the tongue were selected. The control group was composed of 10 matched patients with no clinical evidence of tongue lesions. Polymerase chain reaction (PCR) was used to detect the presence of HPV genome in fresh-frozen tissue specimens from SCC of the tongue margin. Thirty-seven patients (74%) had a positive PCR for oncogenic papillomavirus, and only 1 specimen (10%) of the control group was positive for nononcogenic papillomavirus. Based on the statistical analysis of this study there was a 25.6% higher risk for SCC of the tongue to harbor oncogenic HPV than the healthy control tongue tissue.