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The influence of percussion, occlusion and mastication on the occurrence of silent periods in masseter muscle activity.

The occurrence of silent periods in masseter muscle activity was investigated during percussion of the bony structures of the head and neck, during occlusion of the teeth on surfaces of varying hardness, and during chewing of different food-stuffs. Silent periods were demonstrated on percussion during isometric and isotonic contraction of the masseter muscles and the occurrence of silent periods was influenced by the force of occlusion and by the nature of the surface contacted. Mandibular velocity was investigated during tapping and chewing sequences by ultra-high-speed cinematography, but it was not found possible to identify a critical change in mandibular velocity associated with the occurrence of silent periods. More silent periods were observed during the chewing of hard foods than of soft foods and there were more silent periods near the beginning of chewing sequences than towards the end. Differences in latency and duration of silent periods were observed in relation to artificial changes in the occlusion.

Dental Occlusion↗

Temporomandibular joint disfunction syndrome and myofascial pain dysfunction syndrome: a critical review.

Temporomandibular joint (TMJ) dysfunction syndrome and myofascial pain dysfunction (MPD) syndrome have been primarily viewed as dental problems and have only recently received close attention by psychologists. The literature reviewed in the present paper reveals that a substantial portion of the population is affected by these disorders. There is, however, a great deal of confusion that exists in relation to the aetiology and treatment of these syndromes. In an attempt to clarify the current understanding of these disorders, the present review first presents a discussion of the symptoms which comprise each of these syndromes and the proposed physiological mechanisms associated with each symptom. Next, the aetiological theories for each of these syndromes are reviewed and critically evaluated. Treatments which have been derived from the theoretical models are then discussed. Finally, methodological considerations involving classification, assessment and treatment issues are presented and future research needs are outlined.

Auscultation↗

Study of Bleier tubal clip for fertility control.

Sterilization by oviduct occlusion with plastic mono-construction clips was carried out on a series of 21 doe-rabbits; effective sterilization resulted. Subsequent oviduct re-anastomosis over nylon splints resulted in 58% restoration of fertility as proven by term pregnancies. There were no complications attributable to the clip application.

Animals↗

Orthotic therapy for the partially or fully edentulous patient.

The limited research on the correlation between partially and fully edentulous patients and temporomandibular dysfunction leads this author to believe that a practitioner could expect 25 to 75% of the patients in need of phase 1 orthotic therapy to be in one of these two groups. Unfortunately, most of the literature on orthotic therapy documents cases with a full complement of natural teeth. This chapter gives a systematic approach to the fabrication and insertion of orthotics on and over full and partial dentures.

Dental Occlusion↗

Reproducibility of occlusal contacts utilizing a computerized instrument.

This study was designed to examine clinically the accuracy and reproducibility of occlusal contacts made by a computerized device (the T-scan) in ten asymptomatic subjects. The results showed 100% accuracy and reproducibility for all contacts in all subjects. A great advantage of this instrument over silk marking ribbon is that it not only records contacts but can also analyze the timing and force of each contact.

Adult↗

Nonsurgical management of disc-interference disorders.

Disc-interference disorders are a group of intracapsular problems that make up one category of temporomandibular disorders. The dental profession's understanding of these disorders has changed greatly in recent years. This article reviews current concepts regarding the diagnosis and management of these disorders as revealed through recent clinical studies.

Cartilage, Articular↗

[Effect of wire ligature splint reinforced with preparing groove and employing composite materials on the teeth with severe periodontitis].

Teeth with severe periodontitis exhibit alveolar bone loss, teeth mobility and even teeth loss. The author made groove along the buccal and labial surfaces of teeth, twisted the stainless steel wire and placed ultraviolet light polymerized composite resin over the wire. Teeth with mobility 2-3 degree from 39 patients were treated and the effect was evaluated in the period of 2 to 4 years. The results demonstrated that the treatment had advantages of stabiliting very loose teeth and forming a firm unit. It minimized teeth mobility and improved greatly teeth occlusal function. When occlusing, the device could redirect force to other teeth, thereby reduced traumatism and facilitated periodontal tissue repairing and regeneration and protected loose teeth.

Adult↗

The etiology, diagnosis, and treatment of TMJ dysfunction-pain syndrome. Part III: treatment.

There is general agreement that TMJ dysfunction-pain syndrome is multicausal. Definitive diagnosis is sometimes difficult, and as a result, empirical methods must be utilized. However, in most patients, etiologic causes can be established and specific treatment plans utilized for correction. There are many approaches and methods for palliative treatment which are usually used in combination. Since TMJ dysfunction is multicausal, many clinicians favor one definitive treatment procedure over another, with generally positive results. Those not intimately involved with the treatment of patients with TMJ dysfunction-pain syndrome regard the current state of the art as in complete disarray. If palliative therapy were separated from causative therapy, a new clarification would be possible. Definitive techniques and methods that improve the health of the joint and/or the muscles will usually improve the condition of the patient. There are different approaches to the same disease or dysfunction. This does not alter the essence of the problem, but only how it is viewed and treated by different clinicians. There is much to learn, and only by more documented research can the gaps in current knowledge be filled so that better service can be rendered to our patients.

Acrylic Resins↗

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