アブストラクト（29巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： BKDC CLINICAL AND RESEARCH TOPICS : DAWN OF OCCLUSION - New Aspects of Masticatory Organ / Preface
Subtitle　：
Authors　： Sadao Sato
Authors（kana）　：
Organization　：
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 29
Number　： 2
Page　： 100-100
Year/Month　： 2001 / 9
Article　： Report
Publisher　： Kanagawa Odontological Society
Abstract　： To understand the concept of occlusion, there are a few fundamental questions that need to be addressed: Why is occlusion important? When is it important? How can we provide perfect occlusion? In order to understand its significance, it may be helpful to review the role of anterior and posterior teeth during function and particularly during parafunction. We should recognize that there is substantial contact between opposing teeth while chewing, mild contact during swallowing, and almost no contact during speaking. If we consider the amount of time that teeth are in contact during functional activities, we recognize that this amounts to only 15-20 minutes each day. The amount of force between contacting teeth rarely exceeds 35 to 40 kg per square inch. Enamel, the hardest substance in the human body, can easily withstand that amount of force on a daily basis. The main concerns in the field of dentistry for the past twenty centuries regarding the subject of occlusion have been the functions of the masticatory organ for chewing, swallowing, speaking and esthetics. If human beings utilized their teeth only for these functions (and were able to avoid periodontal disease, dental caries and accidents), they could keep their teeth for a lifetime. In various studies of occlusion, exhaustive attempts have been made to understand the morphology of teeth as it relates to mandibular functional movement. The remaining threat to our teeth is that of attrition, abrasion, abfraction and excessive wear. What has the potential to render the most damage is "bruxism." Sleep bruxism can result in forces being exerted on the teeth ten times greater than those found in functional usage. Furthermore, such forces can be applied intermittently for from 1-4 hours each night. Contemporary dentistry, especially in the field of occlusion, now faces a most difficult and complicated subject: parafunction. Well-designed, harmonized occlusion allows the parts of the stomatognathic system to function without conflict, so that they will be useful throughout the lifetime of a man or woman.
Practice　： Dentistry
Keywords　：