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The purpose of this book appears to be the introduction of a "pain-dysfunction" syndrome, defined as spasm of the masticatory muscles and facial pain. It is based on the assumption that stretching of the masticatory muscles in long sessions of dentistry produces a tender or "trigger" area within the masseter and temporal muscles, as described by Travell and Rinzler. The author at first denies, as did Sicher, that deranged condyle and joint impulses could produce the syndrome and then later lists "painful impulses arising with the joint, as likely."
Early in this book malocclusion is found unimportant in exciting afferent stimuli. In chapters 3 and 4, however, elaborate discussion, describing cases, "led to the conclusion that abnormalities in dental occlusion may contribute to muscle spasm" and that the reaction is reversible, altering occlusion. In other words, the spasm (or trismus) is within the reversible cycle.
Schwartz prefers to use the
Disorders of the Temporomandibular Joint: Diagnosis, Management, Relation to Occlusion of Teeth.. AMA Arch Otolaryngol. 1960;71(6):1029–1030. doi:10.1001/archotol.1960.03770060141013