Öz
Objective: The purpose of this retrospective study was to investigate morphological configurations of root canal anatomy and crown-to-root ratio of mandibular premolar teeth by gender, age intervals and occurrence of bilateral harmony using cone beam computed tomography scanning.
Material and Methods: A total of 1200 cone-beam computed tomographic images of mandibular first and second premolar teeth were obtained from 300 patients. The images were evaluated considering i) morphology of the root canal configurations, ii) crown length, iii) root length, iv) total tooth length, v) crown-to-root ratio; according to gender, age, and unilateral harmony. The data were analyzed with independent sample t-test and one-way analysis of variance (ANOVA). The p value was established as <0.05.
Results: Significant differences were present in gender, age and symmetrical comparisons both mandibular first and second premolar teeth (p<0.05). According to Vertucci's classification, the examined teeth exhibited six different root canal configurations as type I trough out type VI. Significant differences were found between age intervals in determination of crown length, root length, total teeth length and crown-to-root ratio (p<0.05).
Conclusion: In mandibular first premolar teeth, the frequency of two canals was approximately two times higher than second premolar teeth. The crown length and crown-to-root ratio decreased; otherwise, the root length increased by age.