Case Study #6

That answer is incorrect. This is an example of Case Type IV. Case Type IV is also known as advanced perio, and it is displayed in the furcation of the molar since the bone loss is over 50%.

What Case Type is displayed between the molar and premolar and also between the two premolars:

Case Type I (gingivitis)
Case Type II (early perio)
Case Type III (moderate perio)
Case Type IV (advanced perio)