The main way to assess the presence and position of third molars is to take a panoramic radiograph and evaluate certain factors, such as the size of the teeth, the formation of their roots, the direction of eruption, the available space, the jaw bone, etc.
In an attempt to predict the eruption of third molars, several methods have been developed. Some are very ingenious and original, but none has proven to be accurate every time. Some are very simple while others rely on fancy calculations of tooth position and evaluation of future growth.
But… despite the availability of several analytical methods, predicting which teeth will erupt adequately or not is sometimes just a lucky guess!
Look at the following examples of radiographs that show the behavior of wisdom teeth over many year