Evaluation of prognostic value of Periapical and Endodontic Status Scall (PESS), based on two years observation of endodontically treated teeth with apical periodontitis

Abstract

Study aims: to evaluate the survival rate of the endodontically treated teeth with apical periodontitis (AP) over two years, based on Cone Beam Computed Tomography (CBCT) and on digital periapical intra-oral images (DPI), and to estimate the prognostic value of the newly proposed Periapical and Endodontic Status Scale (PESS). Objectives: 1. To compare efficacy of the CBCT and of DPI, for evaluation of the periapical changes in the endodontically treated teeth over two years follow up. 2. To evaluate the impact of the selected anatomical and treatment-related parameters for survival and healing of the endodontically treated teeth, over two-year follow up period. 3. to estimate the prognostic value of Periapical and Endodontic status scale, based on the observed periapical changes over 2 years time. Materials and methods: Prior to the study, the approval of Regional Bioethics committee of Kaunas, Lithuania, will be obtained. The intended beginning of the study - December, 2016, duration - 2 years. The sample of this longitudinal, prospective clinical study will be adult patients (age from 18 to 60 years), referred for treatment to specialist in endodontology. Sample size calculation is based on the data from a clinical study reported by Patel et al, 2012. Thus, with the power of 0,9 and α = 0.05, the estimated study sample should comprise a minimum of 150 teeth. A total number of 165 teeth would allow for a 10 % drop out over the two years period of the study. [...].