Gül Çelik Ünal

Comparative investigation of 2 rotary nickel-titanium instruments: protaper universal versus protaper

OBJECTIVE The objective of this study was to evaluate whether the changes in the design of the ProTaper canal instruments contribute to the shaping ability of the instrument in terms of the morphology of curved canals measured by the cross-sectional area using the Bramante method. STUDY DESIGN Ten extracted human mandibular molars with root canal curvatures between 25 degrees and 41 degrees were used. Ten mesiobuccal canals were instrumented with ProTaper and 10 mesiolingual canals were instrumented with ProTaper Universal rotary instruments. Pre- and postoperative sections were obtained from the coronal, middle, and apical portions and analyzed. Statistical analysis was performed using the Student t test (P < .05). RESULTS No statistically significant difference was observed in terms of amount of dentin removed, transportation, variation of canal shape factor or change in working length, and working time (P > .05). Only one instrument fracture (F2 in the ProTaper group) and 2 instrument deformations (S1 and F3 in ProTaper and ProTaper Universal, respectively) were noted. CONCLUSION Within the limitations of this study, the modifications on ProTaper instruments were found to not create any discrepancy on the shaping abilities of instruments and the evaluated other factors. In addition, both rotary nickel-titanium instruments prepared a well-shaped root canal with minimal canal transportation.

A successful treatment of vertical root fracture: a case report and 4‐year follow‐up

This case report describes a successful treatment of vertically fractured tooth which was reconstructed with a self-etching dual-cured adhesive resin cement and intentionally replanted without using rotation in conjunction with a bio-absorbable barrier membrane. At a follow-up consultation 4 years later, the tooth was asymptomatic, and attachment gain and bone regeneration were observed. In addition, no ankylosis was detected clinically or radiographically.

Eğe iletkenliği ile Root ZX elektronik apeks bulucu doğruluğunun ilişkisi

Objective: The aim of this study was to determine the relationship between the accuracy of the Root ZX apex locator and conductivity of hand files. Material & Method: A group of 47, extracted maxillary anterior teeth were used. Each tooth was mounted in an alginate model so that an electronic apex locator could be used to measure canal length with four different hand ISO 15 K-file groups. All file groups were tested for electrical conductivity using the four-point probe method (n=188). The relationship between the accuracy of Root ZX and electrical conductivity of the files was analysed with Kruskal Wallis at a significance level of 0.05. Results: Whilst 34% of samples were short of the control working length, the highest conductivity values were obtained in Group 2 (p < 0.05). Conclusion: For the conductivity results, there was correlation between accuracy of the Root ZX apex locator and the conductivity of hand files. However clinical trials that involve further apex locators and files of observations are needed. Keywords: Electrical Conductivity, Nickel-Titanium Alloy, Stainless Steel.