He introduced the concept of experimental malocclusion by inducing the over-eruption of teeth, placing restorations in the dentition in supra-occlusion.[3] Anderson carried out a study on five human adult subjects aged 19–49 years; by placing a 0.5mm metal bite-raising cap on the occlusal surface of the subjects’ lower right first permanent molars, he found that each of the subjects were able to occlude their teeth after an experimental period of 23–41 days. He observed the changes in the distances of teeth in opposing arches using reference points on the capped tooth and its opponent, where he identified the introduction of an inter-occlusal space. It was not possible, however, to determine whether the creation of this space was due to the intrusion of the teeth in contact with the bite-raising cap or the eruption of the separated teeth due to the lack of fixed reference points.[3]