Anatomy MB2 second molar

Anatomy MB2 second molar

 

Palazzolo Endodontic Practice 2015  40% MB2, more in men (bigger?), more in younger=less calcified (70% drop to 39% both first and second though), more in those without crown=less calcified and maybe better access, and more in older endo residents

Silva JOE 2014 – Brazil CBCT  306 teeth – 3 roots 3 canals 45% – 3 roots 2 MB 34% – fusion of roots with 1, 2, or 3 canals were 2%, 4%, and 2% respectively – 2 roots 2 canals 4% – 2 roots 3 canals 9%
4 canals – 34%
3 canals – 56%
2 canals – 8%
1 canal – 2%

24% of these have MB2 July 2012 Versaini 2012 (sample of 25)  consistent with 3 rooted molar.  They also created a classification system based on root divergence for these, which is kind of stupid

3 roots 3 canals – 57%

3 roots 4 canals with MB2 – 23%

3 roots and 3 canals that the buccal canals join – 9%

2 roots 2 canals – 7%

1 root 1 canal – 3%

Korean population study CBCT 660 teeth 2012 JOE Single root 5% and 11% fused 34% MB2 .3% MidBuccal root .3% DB2 and 2% P2

Corcoran 2007 JOE 46% to 63% from beginning to end of endo residency.  Initial experience helps

Wolcott 2005 JOE 2038 teeth but includes retreats so little lower.  34% found in untreated teeth  40% in retreats

al Shalabi IEJ 2000 MB2 58% the occurrence of two canals and transverse anastomoses decreased significantly with increasing age

Stropko JOE 1999 Clinical 611 second molars.  MB2 51% as separate canal 47%. However, as the operator became more experienced, scheduled sufficient clinical time, routinely employed the dental operating microscope, and used specific instruments adapted for microendodontics, MB2 canals were located in 93.0% of first molars and 60.4% in second molars.

Peikoff 1996 IEJ 520 completed RCT  23% MB2

Kulild 1990 JOE 54% by hand, 86% with bur, and 94% with scope.

4 roots (2 palatal)1200 radiographic result .4% have 4 Libfeld JOE 89

CBCT studies of second molar root canal anatomy MB2

42% one canal and 11% have 2 POE. 68% have 2 at some point. Small number are single rooted Ghobashy JOE 2017

C Shaped canal

Martins JOE 2016 4% have c shaped canal somewhereC shape canal maxillary molar

 

Palatal canal studies

Variation in palatal canals is very low, 2%, but can be much higher in certain Asian ethnic groups reaching 14% in first molars. Nosrat JOE 2017

DB root studies

Fogel lit review JOE 2017 shows 1.7% have 2 canals, unsure how first and second molars differ.

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