**6. Conclusions**

This review used Micro-CT studies to provide detailed information atop the anatomy of the root and canal morphology in permanent dentition of various populations. Further,

it revealed wide disparities concerning root and canal morphology in permanent dentition, which could perhaps derive from the geographical area studied. In Micro-CT findings, the mandibular incisors followed by maxillary molars were the most studied teeth. The use of multiple categorization systems and Micro-CT allowed for a more precise description of the root canal system and its ramifications, with some inconsistencies noted for molars. This Micro-CT study adds to the existing categorization methods by providing a detailed description of the diversity among root canals and their ramifications and clinically relevant data on the presence and location of lateral canals in all human tooth groups.

**Supplementary Materials:** The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/jcm11092287/s1, Table S1: Quality of included studies by JBI critical appraisal checklist for included studies.

**Author Contributions:** Conceptualization, M.I.K. and T.Y.N.; methodology, M.I.K., S.A., N.A., S.N.B. and T.Y.N.; software, S.N.B. and S.W.P.; validation, A.M. and C.M.M.; formal analysis, A.M. and C.M.M.; investigation, M.I.K., S.A. and N.A.; resources, S.N.B. and S.W.P.; data curation, M.I.K., S.A. and N.A.; writing—original draft preparation, M.I.K., S.A. and A.M.; writing—review and editing, T.Y.N., P.M. and G.A.S.; visualization, N.A.; supervision, T.Y.N. and G.A.S.; project administration, M.I.K.; funding acquisition, P.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This systematic review received no outside funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data used in the current study will be made available at a reasonable request.

**Conflicts of Interest:** The authors declared no conflict of interest.
