Four teams tried to measure the canal width with four different techniques. Some food for thought:

• how would you estimate the canal width from all their measurements?
• the lazy guy took several measurements with the laser device: why did he get different values?
• what kind of errors may have affected the measurements of the different teams?
• how to find out which technique/approach was best?

Try to answer these questions yourself… If you don’t know (all) the answers, don’t worry. We are going to give you clues in this module, so you may review the questions after watching all video’s and completing all tasks in the module. And we will then give you our answers as well.