Canine extraction

[Qnesp]

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I'm faced with a question that I'm having trouble answering.

If a maxillary canine were to be extracted on the left in an Angle class I mutually protected articulation arch relationship, what kind of occlusion would be seen on the left side of the arch during a left laterotrusive and mediotrusive excusions?

A. Anterior guidance will still have some influence
B. The posterior teeth will function in a unilateral balanced articulation without any anterior influence.

I'd appreciate if anyone could weigh in with their expertise on this. Thank you in advance.

 

[THS]

I would assume that if the left max canine was extracted, the distal teeth would eventually drift mesially and may or may not compensate for the missing tooth in terms of canine guidance, it's hard to predict how that will effect excursive movements.

However, assuming the teeth stay in place for a short time: mediotrusive movements (assuming the left side is the working side) would not be affected, since the right canine guidance is still functioning. During protrusive movements, anterior guidance would probably not be affected either. However, for working side movements, I would have to assume that the cusp inclines of the left posterior teeth will cause the rest of the arch to disocclude.

So in my opinion, A for left mediotrusive and B for left laterotrusive.

 

[Mahmoud12125]

I would assume that if the left max canine was extracted, the distal teeth would eventually drift mesially and may or may not compensate for the missing tooth in terms of canine guidance, it's hard to predict how that will effect excursive movements.

However, assuming the teeth stay in place for a short time: mediotrusive movements (assuming the left side is the working side) would not be affected, since the right canine guidance is still functioning. During protrusive movements, anterior guidance would probably not be affected either. However, for working side movements, I would have to assume that the cusp inclines of the left posterior teeth will cause the rest of the arch to disocclude.

So in my opinion, A for left mediotrusive and B for left laterotrusive.

What about the role of the premolars in guiding the occlusion in this situation sir ..can u give ur opinion plz

 

[OhioDMD]

You would have a balanced working occlusion in the premolar and molars in a left laterotrusive movement due to the lack of canine guided disclusion. On a mediotrusive movement there will still be canine guided disclusion due to the presence of the maxillary and mandibular canines on the right.