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fucation of roots

User Level:
Student
Posted by: leicester  (2 years ago)
What is the point of multiple roots? Why do different teeth have different numbers of roots? and why do maxillary teeth have more roots than mandible teeth? If anyone could answer my question and suggest some good scientific papers/book on this subject I would be very grateful
Thanks x
User Level:
Dentist
What is the point of multiple roots? Why do different teeth have different numbers of roots? and why do maxillary teeth have more roots than mandible teeth? If anyone could answer my question and suggest some good scientific papers/book on this subject I would be very grateful
Thanks x


It is bio-engineering. Molar teeth take more force so need more support. The palate is a much wider bone so three roots is possible. The mandible is narrower, so only two wide roots are possible. It is basic human anatomy, really.
Posted 2 years ago
User Level:
Student
Posted by: leicester  (2 years ago)
Thanks for your reply. Is there benefits of this, say better anchorage and improved nutrient/nervous/lymphatic supply? Why would the teeth near the posterior of the mouth need more of the latter? x
User Level:
Dentist
Thanks for your reply. Is there benefits of this, say better anchorage and improved nutrient/nervous/lymphatic supply? Why would the teeth near the posterior of the mouth need more of the latter? x

There is four times the occlusal load on 2nd molars than incisor. Plus forces near the front of the mouth are more vertical in nature (except the canines), where forces in back have more lateral components for grinding. Diverging roots, in the case of upper molars, tend to distribute later forces better.

You will note the canine teeth are responsible for guidance and have facial-lingual forces on them. It is for this reason that canines have the longest root lengths in the mouth. You could not have roots this long on the upper molars or you would have no room for the sinus. So instead of having one very long root,

On the lower molars, there are two broad roots, or sometimes two mesial roots and one wide distal root.
On the upper molars, there are three roots, with the sinus sometimes dipping between facial and palatal roots.

The whole scenario can be understood by efficient distribution of force to the maxilla and mandible.
Posted 2 years ago
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