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Volume 62 (1995)
- Issue 4 Pages 473-
- Issue 3 Pages 347-
- Issue 2 Pages 193-
- Issue 1 Pages 1-
Volume 62, Issue 2
Displaying 1-13 of 13 articles from this issue
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Soji Enosawa1995 Volume 62 Issue 2 Pages 193-211
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe effects of experimental premature contacts (PC) on the mandibular rest position (RP) were investigated using 5 subjects.
Metal castings were fabricated for the unilateral maxillary teeth to simulate various premature contacts. Subjects were asked to sit with their mandible relaxed after 50 tapping efforts at different force levels, and positions of their mandible were measured for 180 seconds. Furthermore, subjects were divided into two groups depending on their chewing patterns ; one was grinding type group and the other was chopping type group.
The results were as follows :
1. The area of RP after the insertion of PC differed from that of RP without PC.
2. There was a positive correlation between the width of distribution of RP without PC and the amount of the RP change after the insertion of PC.
3. The RP shift pattern of grinding type subjects showed the tendency to be influenced strongly by the tapping forces, while that of chopping type subjects was less influenced.
4. The results of this study suggest that the nature of reception of the stimulus by the premature contact has some relationship to one's own chewing pattern.View full abstractDownload PDF (2984K) -
Toshiaki Ueno1995 Volume 62 Issue 2 Pages 212-253
Published: June 30, 1995
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSTo investigate the relationship between teeth clenching in Intercuspal position and isometric shoulder adduction movement in 12 normal subjects, the muscle strength and electromyogram (EMG) of the seven muscles concerned were measured by using Cybex 6000 Extremity Testing and Rehabilitation System and surface EMG analyzing system. Normalized peak torque (n-PT) and normalized average torque (n-AT) were analyzed to find muscle strength. Normalized integrated EMG (n-iEMG) was analyzed to find muscle activity.
The results were as follows :
1. For n-AT, the value in 100 %MVC significantly increased by 5.4% as compared with that in the rest position (RP) .
2. There was a significant positive correlation between biting force of intercuspal position (ICP), 20%MVC, 50%MVC and 100%MVC and muscle strength of n-PT and n-AT.
3. For n-iEMG, the value of latissimus dorsi, teres major, triceps brachii and forearm extensor muscles in 100%MVC significantly increased by 8.4%, 13.0%, 9.3% and 18.9% respectively as compared with that in RP.
4. There was a significant positive correlation between biting force of intercuspal position (ICP), 20%MVC, 50%MVC and 100%MVC and muscle activity of pectralis major, latissimus dorsi, teres major, biceps brachii, triceps brachii, forearm extensor and forearm flexor muscles.View full abstractDownload PDF (7949K) -
Sanae Kasuta1995 Volume 62 Issue 2 Pages 254-268
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSHistochemical and electron microscopic observations were made on normal and denervated masseter muscles of mice to elucidate differences of characteristics between the masticatory muscles and other skeletal muscles.
The three types of muscle fibers were classified by means of Succinic dehydrogenase (SDH) reaction. In masseter muscles of normal adult mice, the three types of fibers, that is, high SDH activity fibers, intermediate SDH activity fibers and low SDH activity fibers, were recognized. More oxidative fibers in the deep portion of masseter muscles were found than that in the superior portion, which suggests that each portion has its own functional role.
It is generally believed that denervation gradually causes atrophy in skeletal muscles. On the other hand, denervated masseter muscles of mice clearly showed different reactions which had two phases. In the first phase right after denervation, many masseter muscle fibers were degenerated, necrosed and regenerated. A few weeks later, in the second phase, muscle fibers remained immature, denervation atrophy was occurred, and dense connective tissue was proliferated.
The other side of nondenervated masseter muscle was not influenced by denervated ones.View full abstractDownload PDF (18411K) -
Kenji Funayama1995 Volume 62 Issue 2 Pages 269-280
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSA comparative study was made between the crowding group and the normal aligned group to clarify the relationship between the growth of the maxilla, occlusion and the alignment of teeth. The material consisted of longitudinal dental casts and lateral cephalograms (II A, III A, III C of Hellman's dental age) taken from each of the 10 children. Differences between the two groups were investigated concerning the size of teeth, dental arches and the coordinates of the landmarks. Then a factor analysis on the growth change, which the coordinates of landmarks showed, was performed.
The results were as follows
1. The differences of both the tooth size and the coordinates of the landmarks on the cephalograms were not significant.
2. From the factor analysis, it was observed that in the crowding group the migrations of the upper anterior teeth and molars were related more closely to the cranial base, the palate and the apical base, and also the dental arch migrated in unity.
3. It was suggested from the above results that although, in the normal group, the anterior teeth and molars migrated independently, stringently controlled migration of the teeth in the crowding group caused the united migration of the arch, resulting in uncompensatory accommodation of the teeth.View full abstractDownload PDF (1375K) -
Kayoko Shinada, Fumiko Ozaki, J. G. O. Cordeiro, Shogoro Okada, Kazuhi ...1995 Volume 62 Issue 2 Pages 281-286
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDenture stomatitis is caused mainly by infection of Candida albicans and Streptococcus mutans, the most predominant members of the bacterial flora on denture surfaces. The purpose of this study was to investigate the adhesion in vitro of C. albicans and of S. mutans to acrylic surfaces and their interactions.
Concentration of C. albicans and of S. mutans (mutational phase I and III in which activities of glucosyltranspherases are higher and lower respectively) were of high levels (≥5.0 × 107 colony-forming-units per ml; CFU/ml) . The colonies in brain-heart-infusion (BHI) broth added 5% sucrose were incubated at 37°C for 18 and 72 hours. Then the samples were dried and evaporated, and examined by S-700 and S-4100 SEM (HITACHI) .
It was found that S. mutans (mutational phase I) synthesized water-insoluble glucans concomitantly with the adhesion of both S. mutans and C. albicans to the acrylic surfaces. Also, adhesion of C. albicans, mediated by cell-to-cell interactions with S. mutans (especially mutational phase III), to the surfaces was observed.View full abstractDownload PDF (5394K) -
Part 1. Anterior Components of Lateral OcclusionTatsuya Shinogaya, Kazuyoshi Baba, Satoshi Akishige, Tooru Sakima, Mak ...1995 Volume 62 Issue 2 Pages 287-302
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSa) Angle of frontal and horizontal inclination b) position c) numbers and d) area of the contact points at several lateral occlusions which have different distances from the intercuspal position (ICP) were examined on 12 normal subjects to suggest the normal form of lateral occlusion. Each lateral contact point was different due to the LED jaw tracing device with which the angle was measured, and the position, numbers and the area were measured using black silicon methods.
The results were as follows:
1. On the angle of frontal inclination, 70% of the subjects showed 25-45 degrees, and especially at the canine's edge to the edge lateral position (EDGE position), C. P. group and G. F. group had significantly different frontal angles. The angle of horizontal inclination had a negative correlation to the frontal inclination, 70% of the subjects showed 20-35 degrees for this angle.
2. The angle of frontal and horizontal inclination was not affected by the balancing contacts.
3. At a 2 mm lateral position from the ICP, the correlation between the angle of frontal inclination with the numbers and area of lateral occlusal contact was more negative than that at another lateral position.View full abstractDownload PDF (1644K) -
Takahito Miyasaka1995 Volume 62 Issue 2 Pages 303-324
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to analyze the recovery process of masticatory muscle activity after mandibular set-back osteotomy. The subjects were 11 adult patients with skeletal mandibular protrusion. They received surgical orthodontic treatment and attained a stable occlusion. E. M. G. recordings of clenching and habitual jaw movement were taken from the temporalis anterior, posterior, and masseter muscles with surface electrodes before preoperative orthodontic treatment, just before surgery, and 6 months, l year and over 5 years after surgery. The parameters of E. M. G. analysis were 70% of the maximum voltage, the buildup time from the onset of activity to 70% of the maximum voltage and the time difference of the onset of activity in reference muscles. The results were as follows
1. The initial level of E. M. G. activity was related to the rate of recovery following surgery.
2. Differences in masticatory muscle activity were reflected in the activity levels of the respective muscles during the recovery period.
3. A fairly complete recovery of E. M. G. activity was attained about ten months after surgery.
4. The time from the onset of activity to attaining 70% of the maximum voltage became progressively shorter.
5. The time difference of the onset of activity in reference muscles decreased.
It was I concluded that masticatory muscle activity could well adapt to the newly surgicallyestablished maxillomandibular skeletal relationship.View full abstractDownload PDF (23826K) -
Nobuyuki Tanaka, Norimichi Inai, Kazuyoshi Baba, Kazuko Uchida, Hideak ...1995 Volume 62 Issue 2 Pages 325-330
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDental treatment was performed on the inhabitants of Iriomote Island, which is a non-dentist island at present, in Okinawa ; two hundred forty-five patients received the treatment for 647 man-days during the period from July 6 through 28, 1994.
Since completion of the treatment plan was considered to be necessary during that period, treatments for many teeth had to be done simultaneously because a large number of dental caries and periodontal disease were found.
Dental hygienic education such as brushing instruction was made but the long-term educational program is considered to be important so as to prevent dental disease as well.
It is to be desired that many dentists become interested in the treatment in non-dentist areas.View full abstractDownload PDF (5701K) -
[in Japanese]1995 Volume 62 Issue 2 Pages 331
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (172K) -
[in Japanese], [in Japanese]1995 Volume 62 Issue 2 Pages 332
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (128K) -
[in Japanese]1995 Volume 62 Issue 2 Pages 333
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (129K) -
[in Japanese], [in Japanese]1995 Volume 62 Issue 2 Pages 334
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (196K) -
[in Japanese], [in Japanese]1995 Volume 62 Issue 2 Pages 335
Published: June 30, 1995
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (152K)
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