| Mastication is an important physiologic function of the oral cavity. Many factors have some effects on it, among of them although heredity plays the leading role, the facors of environment also plays an important part on it. Occlusal force, myoelectricity, curve of mandible movement were used to study masticatory function, among of which masicatory efficiency can most directly reflect mastication and represent chew ability. It can not only support the treatment for some oral, dentofacial diseases, but provide evidence for estimation of oral orthopaedic. Nowadays ,with the increasing incidence rate of dental caries, periodontal diseases, malocclusion, temporomandibular joint disturbance syndrome, oral soft tissue inflammation and the decreasing function of masticatory muscles, the masticatory efficiency of modern people is significantly decreasing, which has aroused the greatest concern in the field of stomatology. It is of great clinical significance to study the masticatory efficiency and its important influence factors. My research team did some research on masticatory efficiency of 7-9-year old children and 13-15-year old middle school students. So in this study, Spectrophotometric method and Dental prescale method were used to do some research on the masticatory efficiency and situation of occlusal contact about medical students whose average is 25-year old and primary school students who are at the mixed dentition period, and to research the correlation between them and relative factors of oral health with the method of salivary occult blood test and questionaires. To study the masticatory efficiency among different ages, sexes, specialities, malocclusions and the effects of oral health had on it. To guide the treatment of malocclusion and the propaganda of oral health.The study consists of the following four partsPart one: A study of salivary occult blood test and its relativefactors about medical college studentsObjective: To research the situation of oral hygiene and oral health care of medical college students and the relative factors which had effects on them. Method: Salivary occult blood test and questionnaires were applied to investigate oral health of medical college students, and analyze its relative factors with SPSS 133.0 system. Result : Positive rate of salivary occult blood test was 43.2% in medical college students, 43.6% in male students, 42.98% in female students, 31.25% in stomatology students, 53.13% in students whose speciality was not stomatology. The rate of gingival diseases and disorder dentition in positive group respectively was 53.95% and 31.58%, in negative group was 37.00% and 17.00%. The rate of oral treatment in positive and negative group was 61.84% and 42.00% respectively, there was significant difference between them. Conclusion: The oral health of medical college students is not optimistic. As far as positive rate of salivary occult blood test, there was no significant difference between sexes but significant differences between different specialities. Half college students like sweet food and carbonated drinks. And it had significant correlation with gingival diseases and disorder dentition. The use rate of dental clean tool as dental floss was low. The rate of salivary occult blood about college students who were not mayor in stomatology was high but the rate of oral treatment was low.Part two: A study of salivary occult blood test and its relativefactors about primary school studentsObjective: To research the situation of oral hygiene and oral health care of primary school students and the relative factors which had effects on them. to explore feasible preventive measures of oral health care. Method: Oral examination, questionnaires and salivary occult blood test were conducted to investigate oral health of primary school students, and analyze its relative factors with SPSS133.0 system. Result: Positive rate of salivary occult blood test was 42.3% in primary school students, 40% in male students, 45.2% in female students, and there was no significant difference between sexes. Among testers 81.69% had mixed dentition, 18.31% were young permanent dentition. 90.1% of testers like sweet food, 47.9% like soft food, 28.2% drink sweet drinks beyond 2 times every day. 31.0% eat snacks above 2 times every day. 12.7% of tester's eating time was less than10minutes every time, 7.04% have crowded anterior teeth(≥4mm). 4.23% have overjet (>5mm), 12.68% have overbite(above half area of the lower teeth was covered by the upper teeth), 19.72% have malposition teeth. 40.85% have the habit of mouth breathing. 16.9% bite tongue, cheek, lip, 30.99% bite finger, pen, 4.23% have tongue thrust. Conclusion: Soft diet, decreasing of eating time and the malocclusion of teeth malposition, crowded, overjet and so on had important effects on the oral health of primary school students. Which also were the relative factors of positive rate of salivary occult blood . Inaddition sweet diet, oral habit had effects on primary school students .Part three: The correlation study of masticatory efficiency and situation of occlusal contact about medical college studentsObjective: To study the masticatory efficiency and the situation of occlusal contact among different sexes , specialities, malocclusions in medical college students. Analyze the relative influent factors about them. Method: Roasted peanuts were used as the test materials to determine the masticatory efficiency of medical college students with the light absorbtion method, to determine the situation of occlusal contact with Dental prescale system. To investigate the oral health and relative factors with the method of oral examination and questionnaires. The datas were analyzed with SPSS 13.0. Result: The average masticatory efficiency of medical college students was 1.069, the occlusal contact area and occlusal bite were 68.67 and 48.03; male students's masticatory efficiency was 1.192, female students's was 0.979; the maticatory efficiency of stomatology students was 1.127, not stomatology students's was 1.007. Average masticatory efficiency in normal occlusion was 1.176, in malocclusion was 0.945. in crowded anterior was 0.974, in overbite was 0.841, in open bite of posterior teeth was 0.738, other malocclusion (crowded degree<4 mm, malposition of several teeth, edge-to-edge bite)was 0.987. The masticatory efficiency of normal occlusion was significantly higher than malocclusion(P<0.05). and have significant difference among overbite, open bite of posterior and other malocclusions(P<0.05). but have no significant difference with crowded anterior teeth(P>0.05). Conclusion: There was significant difference about masticatory efficiency among different malocclusions , sexes and specialities(P<0.05). But no significant difference between male and female medical college students . crowded teeth, sweet food and soft food have important effects on medical college students.Part four: Research on correlation of occlusal contact situation about primary school students at the end of mixed dentition period with Dental prescale systemObjective: To research the occlusal contact situation of primary school students at the end of mixed dentition period and analyze the relative factors. Method: Dental prescale was used to research the situation of occlusal contact, to investigate the oral health and its relative factors with the method of questionnaires and salivary occult blood test, discuss the effects which had on the situation of occlusal contact. Result: The contact area and occlusal force which were bite with maximum force in ICP of primary school students were the followings respectly: 47.337 and 28.528 of male students's, 45.646 and 26.105 of female students's, 45.708 and 26.292 of positive group of salivary occult blood test, 46.849 and 28.674 of negative group, 46.183 and 26.383 of III B, 47.806 and 28.667 of III C. Conclusion: Sex, oral health, diet and malocclusions were the factors which had effects on the primary school students who are now 10-13-year old and at the end of mixed dentition period.
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