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Part 2. Investigation for the validity of the constancy in EMG parameters
Akihiko Watanabe
1987 Volume 31 Issue 3 Pages
539-550
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The evaluation of prognosis is very important. The purpose of this study was to investigate whether the EMG (tapping movement and clench and chin taps) was valid or not for the evaluation of prognosis in complete denture wearers. In part 2, EMG was recorded during 6 months after the end of the adjustment of new complete denture, and the validity of the constancy in EMG parameters was investigated. EMG parameters were same as part 1.
Results were summarized as follows:
1. In part 2, the constancy of the EMG parameters (duration and mean average of the integration) were observed in the clinical good condition of the prognosis. So, it was suggested that the contancy of EMG parameters were valid. But, in the 6 months after the end of the adjustment of new complete denture, the constancy of EMG parameters were observed 1/4 in all parameters.
2. It was also suggested that the S. P. recognition ratio was valid.
3. It was very difficult for the durations in EMG parameters to be applied for the evaluation of prognosis.
4. Most of the mean average of integration had been increasing during 6 months.
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Mitsuru Suzuki
1987 Volume 31 Issue 3 Pages
551-563
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The viscosity of the saliva contributes to the retention and stabilization of the denture base. Salivary proteins are thought to provide such viscosity.
High performance liquid chromatography (HPLC) was applied to analysis of salivary proteins and mixed, parotid and submandibular salivary samples were analyzed, and their constituent proteins were compared. HPLC was found to be useful for salivary protein analysis. It was also found that highly viscous mixed saliva and submandibular saliva were rich in acidic proteins containing a large amount of sugar.
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Akio Takayama
1987 Volume 31 Issue 3 Pages
564-575
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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In this study, for the purpose of evaluate the self-administered relining materials sold on the market, conducted both the physical and the bacteriological studies.
Consequently, the following conclusions were obtained.
1. Physical studies
1) As for the pH, it was about pH 6 mediately after measuring, and about pH 4-7 at the 60 minutes later.
2) The viscosity increased to about twice as much as that at the start of using self-administered relinig materials; LDT-about 30 minutes, CRT and EIZ-about 6 hours.
3) The compressive stress in the gap volume 2.0-0.5mm was found to be larger than that in the gap volume 2.5-1.0mm.
4) The tensile adhesiveness was extremely small.
2. Bacteriological studies
1) No antibacterial action whatever was noted as against
Escherichia coli, Staphylococcus aureus and
Candida albicans.
2) The number of bacteria stuck to
Candida albicans increased gradually with the passage of time.
3) While the cleaning effect of the denture cleaner was marked as against
Candida albicans.
3. From this study, it is necessary to have a dentist give them guidance and monitor the developments.
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I-2. Concerning the Quantitative Analysis of the Ranges of Frontal Masticatory Movements in a Person with Normal Dentate Jaws
Sadahiro Miyazawa
1987 Volume 31 Issue 3 Pages
576-589
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The author for the purpose of clarifying the aspects of masticatory movements and their transitions who possesses a normal set of dentate jaws of group functioned occlusion, recorded the ranges of frontal masticatory movements with the Saphon visi-trainer C-II. Then, the analysis and examination of the frontal masticatory movements were conducted by means of the quantitative analysis. As a result, the following conclusions were obtained.
1) In the mastication of peanuts and TAKUAN, about the same ranges were observed in the early and the middle periods but the ranges decreased in the late period.
2) In the mastication of ham, the ranges were large in the early period but they decreased in the middle and the late periods.
3) In the mastication of peanuts, the variation rates in the early and the middle periods were 74.4-112.2% and those in the late period were 47.7-100.2%, respectively.
4) In the mastication of ham, the variation rates in the early period and those in the middle and the late periods were 49.5-80.9% and 77.7-108.0%, respectively.
5) In the mastication of TAKUAN, the variation rates in the early and the middle periods were 70.5-117.2% and those in the late period were 78.1-139.5%, respectively.
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Maxillary Edentulous Impressions
Masahiko Kikuchi
1987 Volume 31 Issue 3 Pages
590-596
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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It was previously reported that pressures produced during compression of impression materials between parallel disks were affected by several factors, and that hydrodynamical analyses well characterized the results of experiments.
The present study was undertaken to measure and theoretically demonstrate pressure distributions during mechanical impression making of a maxillary edentulous cast and intraoral impression procedures.
The highest pressures were recorded over the anterior palate and pressures decreased with approaching to the posterior end when an unmodified tray was used. Little difference in pressures was found in right-angled direction to the median line of the palate, and small pressures were recorded even on the borders. Such distributions were caused by differences in width of the paths where impression materials flowed.
Addition of relief or an escape hole to the tray brought identical effects as shown in the previous experiments using parallel disks, that is, the pressures distributed rather evenly in the relieved area, while pressures remarkably decreased beneath the escape hole.
The pressure distributions occurred during intraoral impression makig showed same tendencies as those of mechanical impressions of the cast, but some variations were considered according to the manner in which the tray was manually seated.
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Part 2. The Effect of Air-Powder Abrasive System on Gingiva
Kazuhiro Arizumi, Mutsuo Yamauchi, Makoto Segawa, Kensuke Uematsu, Joj ...
1987 Volume 31 Issue 3 Pages
597-605
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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It is considered that clinical application of an air-powder abrasive system for cleaning the cervical area has some effects on gingiva sprayed. These effects are due to changes in distance, angle, et. of the spray. The authors conducted this research to investigate the influence exert on gingiva. Six males, aged 23-25, with normal upper central incisor gingiva were used as subjects. Spraying location and duration were decided as 10 seconds for the cervical area, and one second for direct spray of gingiva. Splaying angle was 60° at a distance of 5mm. Macroscopic and gingival replica observations, and examination of bleeding index and gingival crevicular fluid were carried out before and immediatery after spraying, and one, two, three and seven days folowing spraying.
The following results were obtained.
1. Both the ten second cervical area and one second direct sprayings caused marginal gingival damage that required a one week period to recover macroscopically.
2. Bleeding index and gingival crevicular fluid increased immediately after spraying but soon returned to pre-spraying levels by the next observation period.
3. Damage was discerned by replica observation even one week after spraying in more than half the subjects.
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Shin'ichi Masumi, Shigeki Miyake, Shizuo Toyoda, Yoshio Kozono
1987 Volume 31 Issue 3 Pages
606-611
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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In order to apply Ni-Ti superelastic alloy to wire clasp in dentistry, the bending characteristics and the shape memory treatment of the wire were investigated.
The wire cooled in iced water was more easily bent than that stored at room temperature. In both conditions, however, most of the wire specimens were broken by bending before the radius of curvature became less than three times the diameter of the wire. It was emphasized that a new design of the clasp should be developed for this wire.
At the shape memory treatment, the gypsum-bonded casting investment material was suc-cessfully used to maintain the prepared shape of the wire during the treatment. The optimum treating temperature was 450°C to give the wire superelasticity at the intraoral temperature.
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Part 4. Curvature of Sagittal Condylar Path of Balancing Side
Akihiro Mayanagi, Minoru Kuriyama, Shigeo Hasegawa
1987 Volume 31 Issue 3 Pages
612-617
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The objective of this study is to explain mathematically the effect of curvature of sagittal balancing condylar path on that of tooth path. Conclusions from the calculation are;
(1) Curvature of tooth path increases similar to that of sagittal balancing condylar path.
(2) The relation of curvature between balancing condylar path and tooth path is hardly affected, even if the direction of condyle movement and the inclination of sagittal incisal path altered.
(3) The amount of curvature of balancing molar path is generally equivalent to half value of sagittal condylar path. The amount of curvature of working molar path and incisal path are tenth value.
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Keizo Morimoto, Akihiro Kihara, Takeshi Okamoto, Tsuneo Suetsugu
1987 Volume 31 Issue 3 Pages
618-624
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The general physical and dental features of cleido-cranial dysostosis have been reported. The diagnosis, treatment and histological findings of supernumerary teeth of a patient with cleido-cranial dysostosis is presented. Cellular cementum was much less in a impacted tooth than in erupted supernumerary teeth. The impacted tooth had some deep fissures at occlusal surface of enamel. One of the erupted teeth had evident dysplasia, which is divided into two dentine and pulp.
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III. Microbiological Study
Tomofumi Manako, Keizo Morimoto, Chihiro Sakashita, Hiroko Uetsuhara, ...
1987 Volume 31 Issue 3 Pages
625-630
Published: June 01, 1987
Released on J-STAGE: November 26, 2010
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20 patients with denture stomatitis (DS group) and 22 patients without denture stomatitis (control group) were studied by means of the microbiological approach, including Stomastat and Impression culture. The results obtained were as follows;
1) Stomastat
About 90% of control group were found negative (-) and almost negative (±), but 60% of DS group were found positive (+).
2) Impression Culture Colony formation was not observed in 63.6% of control group and in only 10% of DS group. On the other hand, a great many (more than 25) colonies were observed in 35% of DS group and in only 4.5% of control group. The fungi were mostly identified as Candida albicans, by Candida check and the detection of Chlamydospores.
3) Positive cases of Stomastat formed always the colonies by Impression culture. The both methods were seemed to be correlated. Stomastat was found useful for the identification of fungi.
4) After treatments, 5 patients among 8 with denture stomatitis were changed from positive to negative by both methods.
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Kenji Takahashi
1987 Volume 31 Issue 3 Pages
631-645
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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Cephalometric laminagrams of T. M. J. under the mandibular movements were obtained with “Sectograph”. They were four positions on nonworking side of lateral movement and on protrusive movement. The purpose of this first report was to research the shape of front wall of mandibular fossa, and also to research the movements of condylar top and center with computer operated superposition method and interpolation method. In this study, the standard of horizontal plane was F-H-L.
The results obtained were as follows:
1. Continuous condylar movement could be known through a few sectograms with computer graphics.
2. Anatomical gradient of the front wall of mandibular fossa was 40.41° on average of both sides right and left, and prosthetic gradient was 55.18°.
3. The curved line of condylar center was highly the same with that of condylar top.
4. The condyles under the lateral and protrusive movements showed bodily shift.
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Kiyoharu Kuroki
1987 Volume 31 Issue 3 Pages
646-660
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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Considering the clinical aspects of dental materials used for cast restoration, the presents experiments was undertaken using the original methods to establish the relation beteen tooth and cast restorations under sliding abrasion at the marginal region. The following results were obtained.
1. Abrasion phase was observed using sliding abrasion test machine where the experimental abrasion phase resembled to those occuring inside the mouth. In addition prolonged use of the machine showed no instrumental fatigue.
2. SEM photograph indicated that in type-I cast gold alloy of other metals (Type-IV cast gold alloy with heat-hardening treatment, gold-silver-palladium alloy, silver-indium alloy) the sliding abrasion of tooth was due to extension of metal which maintained the marginal seal.
3. Volume of abrasion in type-I cast gold alloy at the margin was minimum and the tendency of abrasion in tooth and metal surface was well-balanced.
4. Surface form of type-I cast gold alloy after abrasion test depicted smooth margin which indicated better adaptation of the cast restorations to the tooth.
5. The results of this experiments suggested that proper selection of metal for cast restoration can minimize the occurence of secondary caries even after slight attrition at the margin of the restoration.
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Takao Kuwahara, Fumio Takasima, Shuhei Miyauchi, Takao Maruyama
1987 Volume 31 Issue 3 Pages
661-674
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The purpose of this study is to investigate how the effects will appear on the parameters of chewing movement when the physical property of test foods -hardness, viscosity, elasticity, cohesiveness and stickiness- is changed.
Chewing movements of eight types of food texture are recorded and analysed on six subjects with Sirognathograph Analysing System.
The results of analysing eighteen parameters of chewing movement by using score order are followings.
In cuttlefish chewing, amount of jaw opening, lateral shift of closing path, lateral chewing width, cycle time, duration of opening phase and duration of closing phase are increased, while lateral shift of turning point and anteroposterior shift of mean opening path ate decreased.
When chewing carrot, while anteroposterior shift of mean opening path and lateral chewing width are increased, amount of jaw opening, cycle time and duration of opening phase are decreased.
When chewing mashmallow, duration of occluding phase is increased.
Lateral shift of mean opening path, anteroposterior shift of mean closing path and anteroposterior chewing width are unchanged among test foods.
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Takashi Ikeda
1987 Volume 31 Issue 3 Pages
675-688
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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In a daily clinic the hypersensitivity of a vital tooth caused by occlusal overload sometimes is experienced, but this mechanism is an open question.
In this paper, the influenece of occlusal overload on tooth sensation and periodontal tissue was studied. A high inlay was placed in a tooth of a volunteer and the height of super contact was measured with IP-Checker. The threshold of tooth pain elicited by electrical stimulation, the value of vertical tooth migration and the amplitude of periodontal pulsation were measured and the condition of occlusal contact in dental arch was observed before and after the placement, with the following results.
1. In 21 teeth studied, 16 decreased in the threshold of tooth pain, three increased, while two did not show the characterized change.
2. The threshold changes of tooth pain had a significant relationship to the state of the vertical tooth migration and the amplitude of periodontal pulsation.
3. A high inlay sometimes induced the change in the condition of occlusal contact throughout the dental arch even after the proper occlusal adjustment was done.
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Kazuo Kondo
1987 Volume 31 Issue 3 Pages
689-701
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The purpose of this paper is to investigate the functional property of the masseter muscle at the motor unit level in man. The responses of the surface EMG and the bite force were studied by averaging technique, with the following results.
1. The higher threshold units with large twitch tensions were found in the superficial layer of the muscle, the lowers were throughout the muscle.
2. Positive correlation was found between voluntary threshold force and peak twitch tension, linear correlation coefficient was 0.76.
3. The motor units with a larger twitch tension tended to have shorter contraction time, but those of smaller had the wide range.
4. There was a tendency for deeper-layer units to contribute less to the wave form of the surface EMG than did the superficial units.
5. There was a significant tendency for the units recruited with larger forces to contribute extensively to the surface EMG. The linear correlation coefficient was 0.70.
6. In 106 force records, DEM (the discrepancy between electrical activity and mechanical contraction) was observed. It seemed that DEM was similar phenomenon to the latency relaxation.
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Kunihiko Ito, Shigemi Ishikawa, Kunihiko Takahashi, Tooru Onodera, Hid ...
1987 Volume 31 Issue 3 Pages
702-711
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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Success in treating consecutive missing second premolar, first molar, and second molar, may depend upon how the third molar is used as an abutment. Our department tested the third molar as an abutment for such removable partial denture appliances as attachments and telescopic crowns.
This report deals with the effects of these appliances on third molars having short vertical coronal lengths. Retention strengths of the following were measured and compared;
1) Angles of the contacting wall surfaces of two primary crowns both set at 2 degrees, with different mesial and distal wall lengths labelled S and M.
2) I-C attachment, 202 EL, Ipsoclip 783 C, and a telescopic crown where a horizontal pin was placed in the axial surface.
3) Battesti 1183, Conod 1071, and Ceka 723.
Results of the telescopic crowns in condition 1 showed the retention strength to be S=500g and M=860g, and that of the I-C attachment, Ipsoclip, and horizontal pin was720 g, 800g, and 740 g respectively. A retention modifier instrument was used to control the retention strength of the Battesti, Conod, Ceka, and horizontal pin telescopic crowns to its recommended strength of between 500-1, 000g.
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Atsushi Suzuki
1987 Volume 31 Issue 3 Pages
712-725
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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Mandibular movements were studied in six degree-of-freedom with a newly developed Jaw Movement Analyzer in 10 subjects. This analyzer realized that the data of mandibular movements was in correspondance with the morphological data of craniomandible, with the following results.
1. A kinematic condylar point was found in a unilateral side. In the point, paths of border movements including lateral movements converged into a curved surface. This kinematic condylar point was located within the condyle reconstructed three-dimensionally by using a simultaneous lateral tomography in 18 of 20 condyles studied.
2. The range of mandibular border movement was larger than that reported before because of unrestrained condition of the subject's head.
3. The rotational angles of the mandible were 37.34° in the opening direction, 2.44° in the closing direction, 7.10° in the horizontal plane and 2.69° in the frontal plane.
4. The kinematic condylar point was located 0.6 mm anterior, 2.5 mm medial and 0.3 mm inferior to the morphological center of the condyle reconstructed three-dimensionally.
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Concerning the Effects of the Arrangement of Artificial Posterior Teeth
Fumiaki Kawano
1987 Volume 31 Issue 3 Pages
726-739
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The purpose of this study was to investigate how the arrangement of the artificial posterior teeth of the complete denture influenced pressures of supporting tissues under denture. The eight diaphragm pressure sensors were placed on the lower complete denture base to measure the pressures.The pressures were measured dynamically during mastication.
The results were as follows:
1. The pressures in tapping movement were much different among subjects, but the pressures of lingual side showed the common tendency to be greater than the pressures of buccal side.
2. In the cases of subjects 1 and 2, the difference between the pressures in mastication and those in tapping movement was minimum with the standard arrangement. In the case of subject 3, it was minimum with the lingually shifted arrangement.
3. During mastication, total pressures much increased on the chewing side with the buccally shifted arrangement than the standard arrangement, and its difference between on chewing side and non-chewing side got bigger. In the case of the lingually shifted arrangement, its difference got bigger.
4. As the above-mentioned showed, the following was found: The arrangement of the artificial posterior teeth of the complete denture influenced the distribution of the pressures of supporting tissues under denture greatly, and especially in the case of the buccally shifted arrangement, the pressures increased.
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Tetsuo Ichikawa
1987 Volume 31 Issue 3 Pages
740-752
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The purpose of this study was to investigate articulatory movements of tongue and mandible on pronouncing /S/ sound by analysing the timing of articulation and the pattern of tongue-palate contact. The lingual articulation, mandibular movements and speech sound of ten subjects were simultaneously recorded with an electropalatograph and a mandibular kinesiograph.
Results
1. The timing of lingual and mandibular articulation on pronouncing /S/ was generally constant regardless of sounds and was obtained on the average as follows:
(1) The closing movement of mandible began about 110 msec before (V 1), the offset of preceding vowel and tongue-palate contact began about 40 msec before (V 1).
(2) The mandible reached the closest speaking level about 10 msec after (V 1) and the tongue formed the maximum constriction about 20 msec after (V 1).
(3) The opening movement of mandible began about 30 msec before (V 2), the onset of following vowel and releasing the maximum constriction began at the same time.
2. As regards analysing the pattern of tongue-palate contact by numerical methods, there was individual variability in the pattern, but several characteristics among subjects were found as follows:
(1) The variability of the pattern with the same subject and sound was small.
(2) The perturbation of the pattern by the adjacent vowel was greater at the posterior portion of palate as compared with the anterior.
(3) The influence by the preceding vowel at the forming time of the constriction and the influence by the following vowel at the releasing time was recoginized.
(4) The pattern of tongue-palate contact for the muximum constriction was generally constant regardless of sounds except [ASK].
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Takao Maruyama, Toshiya Kuwabara, Fumio Takashima, Shuhei Miyauchi
1987 Volume 31 Issue 3 Pages
753-763
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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This study was carried out to evaluate the effectiveness “Disk Recapturing Bite Plane” for the treatment of anterior disk displacement without reduction (closed lock).
The conclusions are summerized as follows.
1. Eight subjects were selected for this study. They were diagnosed as anterior disk displacement without reduction by clinical physical examinations, radiographic examinations, and chewing movement analysis using Sirognathograph Analysing System.
2. All subjects were treated by “Disk Recapturing Bite Plane”. This bite plane was adjusted so that symptomatic side was unilaterally high (0.5-1.0mm) at premolar and molar legion.
3. After treatment, evaluations were done as follows.
1) All signs and symptoms were disappeared.
2) Rapid recovery of mouth opening degree and appearance of clicking were observed.
3) The condyles of the patients with condylar retrodeviation were located centrally in the mandibular fossa after the treatment.
4) Bone changes of the TMJ components were disappeared.
5) Characteristic chewing patterns of closed lock were disappeared.
4. As mentioned above, it was suggested “Disk Recapturing Bite Plane” could successfully recapture the disk of the patients with closed lock.
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Shoji Kohno, Keiichi Yoshida, Hiroshi Kobayashi, Hiroyuki Miura
1987 Volume 31 Issue 3 Pages
764-769
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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Many TMJ patients who have occlusal interferences often complain of pains in the sternocleidomastoid muscle. The pain occurs mainly in the insertion of the muscle (SCM-I) rather than in the middle of the muscle (SCM-M). In order to investigate a causative mechanism of pain in the sternocleidomastoid muscle in relation to occlusion, the activities of sternocleidomastoid and masticatory muscles were studied by means of EMG during functions in relation to the occlusal contact on six normal subjects. EMG activities of temporal, masseter, SCM-I and SCM-M were recorded by surface and needle electrodes.
EMG activity was recorded from SCM-I in accordance with the activity of the masticatory muscles during tapping, clenching, and mastication. On the other hand little activity was registered from SCM-M. The amplitude of the EMG of SCM-I increased as the occlusal force increased. During chewing the sternocleidomastoid muscle was functioning more actively on the working side than on the non-working side.
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Tohru Tokunaga, Naoji Yuba, Kunio Ohta, Shigeo Kiyohara, Masahiro Tana ...
1987 Volume 31 Issue 3 Pages
770-777
Published: June 01, 1987
Released on J-STAGE: August 10, 2010
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The thermal therapy is one of the effective treatments of temporomandibular joint disorders.
This study was made to investigate the effects of some thermal therapies (ultrasound, heating packs, microwave, far infra red ray and soft laser) on the deep temperature of the masseter muscle.
Five males (from 24 to 28 yrs.) volunteered as normal subjects.
The deep and skin temperatures of the masseter muscle were recorded before and after the thermal stimulation.
The following results were obtained:
1) The deep and skin temperatures of the masseter muscle rose after each thermal stimulation except soft laser.
2) After applications of the moist and dry heating packs, the skin temperature rose much larger than the deep temperature. However, after the applications of ultrasound and microwave, the deep temperature rose as much as the skin temperature.
3) It was concluded that ultrasound and microwave therapies were effective treatments in patients with temporomandibular doint disorders.
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1987 Volume 31 Issue 3 Pages
785
Published: 1987
Released on J-STAGE: August 10, 2010
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1987 Volume 31 Issue 3 Pages
785a
Published: 1987
Released on J-STAGE: August 10, 2010
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