Dental anatomy question

[herasasil]

The primary MANDIBULAR CANINES are usually exoliated by what age?
-6-8yrs
-7-9yrs
-9-12yrs
-14-16yrs

I thought the mandibular permanent canines came in at around 9 years of age. The answer is apparently 9-12 years, how is it not 7-9 or for that matter 6-8yrs?

There is a chart they have to memorize but I am trying to rationalize it based on the anatomy and resorption of the primary tooths root. Is it just 9-12 yrs because there is variability in the resorption time?

Thanks

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[tinman831]

The mandibular canines erupt at around 9-10 years of age. 6-7 would just be too early.

 

[skabbaraju]

The mandibular canines erupt at around 9-10 years of age. 6-7 would just be too early.

The answer s'd have been 7-9yrs. 9-12 seems too delayed.

 

[herasasil]

Looking through my texts, and again found it says the range is between 9-12 years. I know tooth eruption can be delayed. However, its not making any sense to me that the 12 years is in the range. I too agreed it would be 7-9 years or in my mind if the choice existed(8-10yrs) but can anyone explain how 9-12 is right.