Clinical evaluation of temporomandibular joint disorders (TMD) in patients treated with chin cup.

The purpose of this manuscript was twofold: (1) to provide more information on the incidence of temporomandibular joint disorders (TMD) in chin cup-treated patients during and after active treatment; and (2) to evaluate results of functional analysis for one orthodontically treated chin cup patient with temporomandibular joint (TMJ) pain and difficulty of maximum mouth opening. Eighty-six out of a total of 160 chin cup patients responded to our questionnaire and were checked for pain, clicking, and maximum mouth opening. Twenty-eight of the chin cup subjects showed one or more symptom(s) of TMD. Spontaneous pain was found most often during active treatment but clicking (sound) occurred more often during the retention phase. One retreated patient showed remarkable improvement of TMD symptoms.