ABSTRACT
Furcation involvement is a condition in which the destruction of interradicular periodontium occurs in the branching area of multirooted teeth, for which different treatment modalities have been suggested. The aim of this study was to compare the response of grade II mandibular molar furcation defects to Bio-oss versus Platelet Rich Plasma [PRP] and Bio-oss treatment. In this randomized clinical trial, five patients with bilateral grade II furcation involvement of mandibular molars were selected from those referred to the School of Dentistry, Shahed University of Medical Sciences. The molars were treated with Bio-oss and PRP on one side and Bio-oss on the other side. Measurements of the probing pocket depth [PPD], and clinical attachment level [CAL] were recorded at baseline, 1.5 and 3 months after surgery. Wilcoxon signed-rank test was used for statistical analysis. At 1.5 and 3 months after surgery, the mean PPD reduction in the middle area of the furcation, was 2.4 +/- 1.67 mm and 3 +/- 2.0 mm in the test and 1 +/- 1.22 mm and 1.1 +/- 0.89 mm in the control groups, respectively. The mean attachment gain at the same place was 1.6 +/- 0.54 mm at 1.5 months and 1.8 +/- 0.44 mm at 3 months in the test group, and 1.5 +/- 1.0mm at 1.5 months and 1.4 +/- 1.34 mm at 3 months in the control group. The results of this study showed no significant difference between treatment with Bio-Oss with and without PRP in regeneration of grade II furcation involvement
ABSTRACT
Endodontic smear layer [SL] can reduce the apical seal and adaptation of gutta-percha to root canals [RCs]. Instruments with adequate flexibility and proper speed create less smear during RC preparation. The purpose of this in vitro study was to compare the amount of SL following canal preparation by hand and rotary instrumentation. Sixty freshly extracted single-rooted teeth with minimum curvatures were divided into two groups. All canals in group 1 were instrumented with SS-type K-files using a step-back technique. The remaining teeth constituting group 2 were divided into 3 subgroups and prepared by employing the GT profile system at rotational speeds of 1000, 8000, and 24000 rpm. In both groups, 2 teeth were selected as controls, which were placed in 17% EDTA for 15 minutes and then washed with 5.25% Naocl. All specimens were cut bucco-lingually, and evaluated under an electron microscope. Kruskal-Wallis and Man-Whitney U tests were used to compare the groups. A significant difference in the amount of SL was not observed between the three rotational speeds at the coronal portions of the RCs. These sections were cleaner in the 1000 and 24000 rpm groups. No significant difference was found between the two instrumentation techniques in the apical portions. The mean size of the smear plug was larger and showed a greater amount of attachment in group 1 as compared to group 2. Ni-Ti rotary instruments produced a thinner SL with less attachment to the root canal walls making it easy to remove with sufficient irrigation