SLOB buccal object rule

[jsvlad]

[[[

According to the buccal object rule, when the xray tube is repositioned either at a more mesial or at a more distal angulation and a film is exposed, the root or canal farther from the film (the buccal) will:
a. move in the opposite direction that the cone is directed
b. move in the same direction that the cone is directed..... ANSWER
c. not move at all


this ans is right ans as , they have mentioned that the object on the buccal side move in the same direction cone is directed , that means if cone is directed distally its rays are directed distally but originally cone is moved toward the mesial side, and it is the opposite side .
I hope I am able to explain it , anyone else?



]]]

i found this on another thread that is closed.

this doesn't make sense to me because this would indicate that the answer is always B because even the lingual root will appear to move distally. That is, the lingual root will appear to move in the direction in which the cone is directed!

is this a stupid question?

---

Members don't see this ad.

 

[goldendoc]

I'll try to explain..I'm not sure if it's going to be clearer. This is whawt I've understood.
When the cone is directed more mesially, it implies that it is from a more distal direction( tube head more distal than the previous position).. thus the buccally placed object would move in the direction opposite to this according to the SLOB rule, that is it will move mesially. Thus in effect, when it will move in the same direction as the cone is directed to , but opposite of the angle from which it is directed.

 

[preOMFS]

Think about riding in a car down the freeway lined by trees. If you look out the side window, the trees closest will be zooming by because they are closer, but the trees further away look like they are following you.

In order to keep looking at the trees further away, you have to move your head slightly back in the direction of where the car just came from, which is the same direction that the closer trees appear to be moving.