Answer:

Explanation:
The question can be answered by using the thermal expansion theory. We need to use the formulas for the volume expansion.
Let's assume we have some material with a linear thermal expansion coefficient
, an initial volume
to an initial temperature
which is later to a final temperature 
The change in volume due to thermal expansion is

The teeth filling has an initial volume of

At a temperature of

Its linear thermal expansion coefficient is

The final temperature of the ice cream which caused the filling to come out was

Since the thermal coefficient is expressed in reciprocal Kelvin degrees, we need to convert the temperatures to 


Thus we have



This differential contraction of the filling relative to the rest of the tooth caused the event