orthodontic and periodontal considerations in treatment of adult patients the coordination of orthodontics with periodontics in treating adult patients with high esthetic expectations is essential in this article three broad categories of relationships between the two specialties are described in addition several simple clinical situations illustrate how the interactions can help to improve the outcome of dental treatments lack of postextrasystolic potentiation in a normal heart lack of postextrasystolic potentiation in a normal heart is described the phenomenon might be attributed to calcium channel blocker treatment we could not find a previous description of such a phenomenon in the english literature