18 August 2020>: Clinical Research
Root Anatomy and Root Canal Morphology of Maxillary Second Permanent Molars in a Chongqing Population: A Cone-Beam Computed Tomography Study
Yu Xia 123CDEF , Xin Qiao 123BC , Ya-jing Huang 123CD , Yue-heng Li 123AE* , Zhi Zhou 123AGDOI: 10.12659/MSM.922794
Med Sci Monit 2020; 26:e922794
Table 7 Numbers of roots in maxillary permanent second molars reported in previous studies.
Author (year) | Sample size of maxillary permanent second molar (n) | Ethnic population | Research method | The prevalence of one root | The prevalence of two roots | The prevalence of three roots | The prevalence of four roots |
---|---|---|---|---|---|---|---|
Zhang et al. 2011 | 210 | China | CBCT | 10.5% | 8.1% | 81.4% | – |
Khademi et al. 2017 | 460 | Iran | CBCT | 4.7% | 6.3% | 88.2% | 0.6% |
Neelakantan et al. 2010 | 205 | India | CBCT | 0.9% | 5.8% | 93.1% | – |
Ratanajirasut et al. 2018 | 457 | Thailand | CBCT | 3.5% | 9.2% | 87.1% | 0.2% |
Nikoloudaki et al. 2015 | 402 | Greek | CBCT | 5.47% | 8.21% | 85.07% | 1.24% |
Silva et al. 2014 | 306 | Brazil | CBCT | – | – | 45.09% | – |
Perez-Heredia et al. 2017 | 142 | Spain | CBCT | 16.9% | 4.2% | 78.9% | – |
Martins et al. 2018 | 802 | Portugal | CBCT | 13.3% | 13.2% | 72.9% | 0.5% |
Ghobashy et al. 2017 | 610 | Egypt | CBCT | 1.6% | 10.7% | 87.7% | – |
Kim et al. 2012 | 821 | Korea | CBCT | 10.2% | 13% | 76.3% | 0.5% |