It has been researched, that lateral force is not only the cause of tooth destruction and mal-posi-tioning, but might also be the primary or promotional factor leading to related periodontal diseases, the result of which ends with the tooth or teeth having to be removed. Author has already reported about the relationship between sleeping posture and tooth loss. And it has become obvious that sleeping posture dose very definitely play an instrumental role in tooth and periodontal tissue damage, and sleeping on one's back was found to be far healthier for the teeth and periodontal structures than sleeping face down on one's cheek or jaw. The study, however, was conducted with only 96 patients and did not include detailed information about sex or age.
697 Japanese dental patients were used for this current study to make it clearer that poor sleeping posture can and will bring about tooth loss. The sleeping postures of patients who were diagnosed as having periodontal abscesses in a dental clinic were also checked.
It was obviously recognized in patients 60-69 years of age, that MT (the number of missing teeth) was larger in the group that did not sleep on their back compared to those that did (p<0.05) . This was especially true with male patient (p<0.01) . In the case of females in their 20's, the number of decayed or filled teeth on anterior (p<0.05) and the number of missing teeth on the posterior (p<0.10) was smaller in those that slept on their back compared to those that did not. Concerning periodontal abscess, 11 of 13 patients had the same side cheek pressed due to poor sleeping habits.
These findings point out that lateral force caused by poor sleeping posture is very harmful to oral health, and that it can result in tooth loss and periodontal diseases worse.

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In prosthesis for defects, the duration for which prostheses can be used is very important both for patients and dentists.
As a prosthetic method with minimum risks for both patients and dentists, the telescope system among rigid support removable prostheses was evaluated.

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