• The Accuracy and Efficiency of a Dynamic 3D Navigation System for Negotiating Calcified Canals

      dianat, omid; Chand, Priya (2020)
      The purpose of this study is to compare the use of a dynamic navigation system (DNS) to a freehand (FH) method for locating calcified canals. Sixty single-rooted teeth with obliterations were selected. In the DNS group, access preparation was made under navigation and in the FH group without any guidance. Linear and angular deviations and reduced dentin thickness were measured. Furthermore, efficiency was evaluated. The mean linear and angular measurements showed significantly less deviations in the DNS group compared to the FH group. Reduced dentin thickness, at both levels, was significantly less in the DNS group. Furthermore, DNS was faster and more successful than FH method. The DNS group showed only one unsuccessful attempt, compared to five perforations and three large transportations in the FH group. Within the limitation of this study, the dynamic navigation system allowed for more accurate and efficient negotiation of the calcified root canal system.
    • Comparison of Setting Expansion of White MTA and Endosequence Root Repair Material Putty Fast Set

      Ghiasi Afjeh, Seyedeh Pegah; Chand, Priya (2020)
      The purpose of root end filling material in endodontic surgery is to provide a seal to prevent the ingress and egress of bacterial toxins into the periapical area. One reason for the sealing ability of these materials is their expansion upon setting. The aim of this study was to compare the percent linear setting expansion of WMTA and ERRM putty fast set using a linear voltage displacement transducer (LVDT) under controlled temperature of 37° Celsius. Materials were prepared according to the manufacturer’s instructions and packed into the hollow hydrophilic porous tubing. Approximately 200 µL of HBSS was added to the porous tube in order to initiate the setting reaction. Expansion changes were measured until it appeared to have plateaued. ERRM putty showed a significantly greater mean percent expansion compared to the MTA (P≤0.005). MTA expanded an average of 0.109% (0.08%-0.20%) while ERRM putty expanded an average of 6.63% (2.93%-8.89%).
    • The Relationship Between Short Term Healing of Periapical Lesions and Glycemic Control: A Pilot Study

      Zhou, Zuwu; Chand, Priya; Tordik, Patricia (2019)
      The aim of this study was to evaluate the relationship between HbA1c level and short-term healing of periapical lesions after non-surgical root canal treatment (NSRCT). After NSRCT, digital periapical radiographs were taken and blood samples were drawn for HbA1c analysis. To assess short-term healing (PAI difference), subjects returned after six months for a radiograph and blood draw. A calibration exercise established the reliability of the PAI scoring process. Thirty-eight subjects returned for the recall. The relationship between HbA1c level and also the co-variables, with healing was explained using Spearman’s rho and logistic regression. There was a significant correlation between healing and HbA1c level (rs = -.52, p ≤.0001), age (rs = -.44, p ≤.003), recall days (rs =.29, p ≤.036), and cardiovascular status (rs = -.34, p ≤.018). A final logistic regression showed a significant relationship between HbA1c level and short-term healing of periapical lesions (R = .62, p≤ .05).