Anchor: Since then, researchers have studied bonding, implants, and periodontal disease.
Entailed: Researchers studied bonding, implants and peridinysl disease. 
Contradiction: Researchers decided to study distraction. 
Contradiction: No it isn't.
Contradiction: It is possible to quickly tell the difference between makers, and Mavens can do it.
Contradiction: A dog is running through a cul-de sac.
Contradiction: The proposed rule was published in the Federal Register.