日本補綴歯科学会雑誌

空嚥下時における下顎の動態について

その1.歯牙接触および下顎安静位

小林仁一, 寺田善博, 平安亮造

1989 年 33 巻 1 号 p. 1-7
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.1

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We investigated the swallowing of saliva on 11 adults with a normal tooth alignment and a normal occlusion.
The envelope of sagittal incisal point movements of the mandible was analyzed by means of the infrared sensor system. Frankfurt horizontal plane was used as a reference plane.
The following conclusions were obtained based on the experimental results.
1. The mean linear distance between retruded tooth contact position (RCP) and intercuspal position (ICP) was 1.35 mm.
2. The mean linear distance between most retruded tooth contact position during swallowing saliva (SRCP) and ICP was 0.13 mm. The ratio of SRCP to RCP was about 10 percent.
3. The rest position of the mandible induced by swallowing saliva (RP) was 1.05 mm apart from ICP.
4. The maximum interocclusal distance during a cycle of swallowing saliva (MOP) was 1.70 mm in the average of 11 subjects. RP and MOP were significantly different from each other in the average of 11 subjects. However, individuals whose RP and MOP were significantly different were 6 subjects of 11.

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装着材の違いが全部被覆冠の適合精度ならびに維持力に及ぼす影響

従来型歯科用セメントと接着性レジンの比較

赤瀬公計, 矢谷博文, 近藤康弘, 山下敦

1989 年 33 巻 1 号 p. 8-16
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.8

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The ability of luting materials to minimize the marginal opening during the cementing process is an important factor in preventing recurrent caries and gingival inflammatory response. The newly developed adhesive resins may have the possibility to achieve better retention and to minimize the microleakage at the tooth/restoration interface since they have the ability to adhere both dental alloy and tooth structure.
The purpose of this study is to compare the marginal fit and tensile strength of full veneer crowns cemented by two adhesive resins-Panavia EX and Super-Bond C&B-with those cemented by three usual luting materials-zinc phosphate cement, polycarboxylate cement, and glassionomer cement-.
The results were summarized as follows.
1. Panavia EX provided the most excellent marginal fit, whereas Super bond C&B the worst.
2. There was no significant difference in marginal fit between the shoulder and the chamfer configuration in every luting material examined.
3. The tensile strength of full veneer crowns cemented by the two resins was approximately times as large as that cemented by other three luting materials.
4. The results show that Panavia EX was superior to other four materials in that it had the highest tensile strength and the least marginal opening at the crown/abutment interface.

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義歯床下組織の負担圧に関する基礎的研究

第1報顎堤の高さと荷重の相違による影響について

藤森克俊

1989 年 33 巻 1 号 p. 17-28
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.17

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The purpose of this report is to investigate influence of difference in shape of ridge (height) and load (point, direction and strength) on bearing stress of basal seat. The stress against various loads (200-2, 000 gf) onto artificial tooth (maxillaly first molar) were measured by using dentures, buried stress sensor, upon simulations of maxillaly edentulous posterior ridges with three types in height (9-15mm). The summary of results are shown below:
1. When vertical loads onto mesial pit were applied, stress in working was most at ridge. The stronger load was, the more increased stress, and the shorter height of ridge was, the more decreased stress. Stress in balancing was most at palate. The stronger load was and the shorter height was, the more increased stress.
2. When oblique loads onto buccal cusp were applied 30° to vertical, stress in working was most at palate. The stronger loads was, the more increased stress. In balancing, the stronger load was and the shorter height was, the more happened negative atmospheric pressure and breakaway of denture.
3. When oblique loads onto lingual cusp were applied 30° to vertical, stress were most at buccal in working and at palate in balancing. At both areas, the stronger load was and the shorter height was, the more increased stress.

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全部床義歯患者の予後に関する臨床的研究装着5-10年の観察

第3報義歯床の適合試験

森戸光彦, 新井保幸, 森正博, 竹重利枝子, 小崎恒範, 大月峰子, 柘植英一, 土田富士夫, 松本亀治, 椎名順朗, ...

1989 年 33 巻 1 号 p. 29-36
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.29

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The purpose of this study was to estimate the clinical condition of complete denture wearers. 72 patients came to our Dental Hospital according to our recall. The examination consisted of a questionnaire and clinical examinations. For objective evaluation, the fitness test of lower complete denture base was taken place and was classified into four groups by the thickness of the white-silicone film (A-zone 0-30 μm, B-zone 30-70 μm, C-zone 70-130 μm, D-zone 130 μm -).
Results
1. The average ratio of four groups of the white-silicone film were A-zone 9.3%, B-zone 35.8%, C-zone 24.5% and D-zone 30.4%.
2. The fitness of anterior portion was ill fit in comparison with posterior portion.
3. There was statistically significant difference between the fitness of lower complete denture and dentist's judgment diagnosed as ill fit denture.
4. There was significant difference between the fitness test and the patients who complained about loose fit of the denture.

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かみしめによる咀嚼筋疲労とその回復に関する筋電図学的研究

第1報各種周波数分析法の比較

堀久至

1989 年 33 巻 1 号 p. 37-42
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.37

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The aim of this paper was to determine the best parameter for describing the muscle fatiguing process. Three parameters of mean power frequency (MPF), median frequency (MF), and peak frequency (PF) were tested with healthy subjects.
During 10 sessions at more than one week intervals, the subjects performed the same endurance test with clenching at 80% of maximal electromyographic activity. Changes in the surface electromyogram of the bilateral masseter and temporal muscles were obtained in the above three parameters.
From the comparison between the three parameters, PF showed the largest scattering, and MPF indicated a clear difference calculated from the values before and after fatigue. Thus it is concluded that MPF may be the best parameter.

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咀嚼時の歯牙滑走運動に関する研究

第1報咀嚼様空口運動時の歯牙滑走運動と側方滑走運動の比較

水野亨

1989 年 33 巻 1 号 p. 43-56
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.43

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The purpose of this study is to clarify the relationship between grinding movements during chewing, and lateral excursions starting from the intercuspal position. For this purpose, I measured two different types of three-dimensional mandibular movement ; lateral excursions and empty-jaw movement like chewing in 10 subjects, and compared these paths with each other in the lateral occlusal position, when the incisal point is 2.0 mm distant from the intercuspal position.
The results can be summarized as follows:
1. The two positions of the incisal point were statistically coincident.
2. The position of both working and non-working side molars during chewing tended to be inferior to that during lateral excursion.
3. The moved distance of the working side condyle during chewing was significantly less than that during lateral excursion.
4. The position of the non-working side condyle during chewing tended to be medial to that during lateral excursion.
5. The difference in the condylar position was deeply related to that in the molar position.
The differences mentioned above were considered to be originated from the difference in the masticatory muscle activity and the occlusal contact.

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陶材焼付金属冠の非破壊的応力解析

第2報各種焼付用金合金のX線回折およびX線応力測定

寺田善博, 徳丸哲也, 吉田龍生, 平安亮造

1989 年 33 巻 1 号 p. 57-63
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.57

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Porcelain-fused-to-metal crowns though having a better aesthetic appearance, are admittedly inferior in strength, as compared with full cast crowns.
We have used the X-ray stress measurement method that is the means of a non-destructive measurement, and this method is used to assess the residual stresses of various metals.
X-ray diffraction examinations were made to evaluate the possibility of X-ray stress measurement of precious metals.
Precious metal strips were then prepared to determine the change in the stress value during the porcelain firing process. The high compression stress produced by polishing was reduced by degassing.
X-ray stress measurement of precious metals were successfully obtained.

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窒化物系セラミックスの歯科鋳造への応用

第2報Co-Cr合金に対するコーティング材としての可能性

金谷貢, 野村修一, 石岡靖, 堀田憲康, 木村勇雄

1989 年 33 巻 1 号 p. 64-69
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.64

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Nitrides used in this experiment are hBN, AN and Si₃N₄. We studied feasibility of nitrides as wax pattern coating materials for Co-Cr alloy in an atmosphere of argon. Wax patterns were painted with coating material of nitrides (first investing), then a mixture of phosphate bonded investment and water was used in outer investing (second investing). The temperature of mold was 800°C, and an argon arc vacuum-pressure casting machine was used. We cast the thin specimens in Co-Cr alloy (composition Co: 63wt%, Cr: 27 wt%, Mo: 5 wt%, Bal.: 5 wt%; melting point: 1, 380°C). Surfaces of cast specimens were investigated using the unaided eye, a scanning electron microscope and a surface roughness analyzer.
Furthermore, the thick specimens (globular form:φ 6.5mm) using coating material of hBN were investigated using the unaided eye.
Results were summarized as follows;
1. The nitrides controlled remarkably the reaction between cast specimen and investment.
2. The nitrides had the good effect of separation.
3. The cast surface coated the nitrides had less clinging than uncoated one, and this indicated that its cleansability was improved.
4. The nitrides decreased the surface roughness (Rz) of the cast to about 1/3.
5. hBN had the best effect in nitrides.
6. hBN also had the effect in a thick globular specimen.

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光重合型硬質レジンの重合性に関する研究

第3報オペークレジンの接着強さへの影響について

吉田圭一

1989 年 33 巻 1 号 p. 70-81
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.70

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New light-curable adhesive opaque resins were prepared using 4-methacryloxyethyl trimellitate anhydride (4-META), triethylene glycol dimethacrylate (TEGDMA), di (naethacryloxyethyl) trimethylhexamethylene diurethane (UDMA) and titanium dioxide. The purpose of this study was to investigate the relation between the conversion of opaque resins and the bond strengths. Amounts of residual monomers in the bulk-photo-polymerized resins with various compositions were determined by high-performance liquid chromatography. Shear bond strengths of light-cured opaque resins joined to surface-treated Au-Ag-Pd alloy were measured with various primers, components and curing conditions. Photo-polymerized resins which contained mehyl methacrylate (MMA) showed lower conversion compared with bifunctional methacrylate resins. Favorable shear bond strengths were obtained from TEGDMA/UDMA based opaque resins. The opaque resins without MMA bonded strongly to heated and 4-META primed Au-Ag-Pd alloy and 22-23 MPa strengths were maintained after 20, 000 thermocycles.
The results revealed that the conversion of MMA with photo-initiater system was lower than that of bifunctional methacrylate, which affected bond strength of opaque resins.

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冠・架工義歯補綴に関する統計的観察

甘利光治, 片岡滋, 岩井啓三, 石原善和, 高橋喜博, 宮崎晴朗, 竹下義仁, 大島俊昭, 稲生衡樹, 森岡芳樹

1989 年 33 巻 1 号 p. 82-93
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.82

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A study was made of 11, 425 crowns and 2, 385 bridges which had been fabricated for 5, 588 patients at the Prosthetic Clinic of Matsumoto Dental College during the fourteenyear period, from January 1973 to December 1986.
Some of the results were as follows:
1. 753 patients, 1, 585 crowns and 372 bridges in 1983 were the most numerous in all the survey years.
2. The rate of vital teeth of crowns has increased from 1984.
3. Of crowns, 22.1% and of bridge retainers, 22.3% were fabricated as porcelain fused to metal crown in 1985.
4. The rate of resin facing crowns of crowns and bridge retainers increased sharply in 1986.
5. Of crowns, 19.0% and of bridge retainers, 30.5% were fabricated as partial coverage crowns in 1986.
6. The rate of more than 5-unit bridges increased from 1982 to 1985.

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テレメータリングによる全部床義歯の咬合接触

小林賢一, 守澤正幸, 渡邊竜登美, 関田俊明, 長尾正憲

1989 年 33 巻 1 号 p. 94-105
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.94

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The purpose of this study was to develop a telemetry system and to analyze the occlusal contacts of complete denture during mastication.
The telemetry system consisted of a transmitter unit and a receiver unit. The transmitter allowed 6 channels of information of the occlusal contacts to be telemetered by time division multiplex communication method within the approximate distance of 2 m.
The occlusal surface of the upper complete denture was made of metal and that of the lowerdenture was made of metal contact plates of 0.5 mm in width with each space of 0.5 mm. Then the transmitter was embedded in the lower complete denture. Occlusal contacts of 66 aged edentulous male were investigated both on the chewing side and on the nonchewing side in the premolar, the 1st molar and the 2nd molar regions.
The results were as followed:
1. The occlusal contacts in the nonchewing side preceded those in the chewing side, with higher frequency and longer duration.
2. In the nonchewing side, the occlusal contact occurred at different time; the occlusal contact was observed first in the 2nd molar, then 32-48 ms later in the 1st molar, and 2-48 ms later in the premolar regions.
3. It is suggested that the balancing contact should be considered for stabilizing the denture in mastication.

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リベース用常温重合レジンの重合時の温度変化について

安藤雅康, 山内六男, 川野襄二

1989 年 33 巻 1 号 p. 106-113
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.106

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Maximum temperatures, time elapsed to reach them and setting times of four kinds of self-curing resins for rebasing were measured during polymerization at 37°with attention to curing conditions which might lead to the discomfort of patients in direct rebasing. The temperatures were lower and both times were longer than those of ones for making temporary crowns. When varying thickness of the resins, the maximum temperature and the setting time significantly increased depending on an increase in the thickness, although the time clasped to reach the maximum temperature showed no difference. All values measured were remarkably influenced by pre polymer powder/monomer ratios.

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マイクロ波重合型義歯床用レジンの寸法精度

内田欣臣, 岡本史江, 尾形和彦, 佐藤隆志

1989 年 33 巻 1 号 p. 114-118
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.114

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Recently, microwave-cured denture base resin was developed, and the resin solved the problem of internal porosity which had been generated by curing the conventional denture base resins with microwave irradiation.
In this study, the dimensional accuracy of microwave-cured denture base resin was compared with that of other denture base resins, such as pour-type resin, heat-cured resin and heat-shock resin. From the experiment, the following results were obtained.
1. Dimensional accuracy of microwave-cured denture base resin was better than that of heat-cured resin and heat-shock resin, and was similar to that of pour-type resin.
2. Dimensional accuracy of microwave-cured denture base resin by slow cooling method and rapid cooling method was almost the same.
Those findings suggest that microwave-cured denture base resin is valuable in clinic.

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顎顔面欠損患者の1治療例

Deltopectralflapによる口蓋閉鎖術および頬部再建後の補綴処置

染谷さき子, 福田廣志, 舟久保太, 根本一男, 金沢孝, 下平聖志, 諏訪綱義

1989 年 33 巻 1 号 p. 119-126
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.119

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The patient, a 72-year-old edentulous man, had an extensive maxillofacial defect caused by treatment of the maxillary cartinoma. As his left maxillary and zygomatic bone, a portion of the soft palate, orbital cavity contents and soft tissues of the cheek had been excised, his face was ugly, and his speech and eating were extremely poor.
For this patient, first of all, plastic surgeons reconstructed the cheek and palate using deltopectral flap. Secondly, dentists prepared a facial prosthesis and a set of complete dentures. Four months after prosthetic treatment, plastic surgeons corrected the left corner of the mouth using temporal muscle flap and fascia lata, and strengthened infraorbial region of deltopectral flap by grafting the left 5th rib. Lastly, dentists remade the facial prosthesis. As a result, the patient had great improvement in his face, speech and eating. Periodic examination of the surgical site can be practiced through the remaining facial defect.
The advantages of the surgical reconstruction in this case were as follows.(1) As reconstruction of the cheek narrowed a facial defect, it was easy to improve patient's appearance by a small facial prosthesis.(2) The closure of the palate was effective to improve hypernasal speech, to prevent fluid leakage into the nasal cavity and to improve the retention and stability of the upper complete denture.

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酸化亜鉛ユージノール印象材に関する研究

硬化速度に及ぼす温度と湿度の影響

熊谷啓二, 民谷暢敏, 岩本一夫, 谷口雄二, 武田秀雄, 菊月圭吾, 根本秀樹, 平井東英, 長谷剛史, 山田芳夫, ...

1989 年 33 巻 1 号 p. 127-132
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.127

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Zinc oxide-eugenol paste are widely used in clinical dentistry, principally forimpression of non-undercut edentulous ridges, or bite taking materials. However it has beenrealized by those who use these paste that different products, direction for mixing, or differentconditions for mixing, have different characteristics.
An experiment have been made to observe the influence of different conditions for mixingto the setting time.
Zinc oxide-eugenol impression pastes were mixed in accordance with the manufacturer'sinstruction when supplied. The condition for mixing was at temperature of 15±1, 20±1, 25±1, 30+1° and at humidity of 40±5, 70±5, 90±5%. The setting time (a initial settingtime, a final setting time) was defined in the A.D.A. specification No.16.
The following results were obtained.
1. A higher temperature and humidity shortened the initial setting time of all paste.
2. A higher temperature and humidity shortened slightly the time interval between a initialand a final setting time of all paste.
3. In clinical use, sample C is better than other ones, so that a setting time of the sampleis property for impression making.

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老化と必須微量元素の欠乏に関する研究

第1報義歯装着者の血清亜鉛濃度と味覚閾値の変動について

吉田鐘一, 田中久敏

1989 年 33 巻 1 号 p. 133-142
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.133

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The zinc appears to play a significant roles in enzymatic activities as well as taste qualities, and it has been given cosiderable attention to the decreased serum zinc concentration patients who has been suffering from changes in taste acuity. There is, however, no report regarding the influence of the zinc concentration related to the denture wearers taste qualities.
This study was undetaken to elucidate the correlation between serum zinc concentration and taste acuity in denture wearers. Total of 66 subjects were selected on 35 male and 31 female, aged 22 to 81 years. Within 66 subjects, 16 male and 18 female were denture wearers on aged 35 to 81 years. Serum zinc levels were made using atomic-absorption flame spectrophotometry, and taste thresholds were tested using electrogustometer on the anterior and posterior part of thetongue and on the soft palate.
The results were as follows:
1. Significant decrease in serum zinc concentration with advancing age were obtained in both male and female subjects (Male: Y=123.1 - 0.4 X, R= -0.67, p < 0.01, Female: Y = 103.5-0.2 X, R= -0.37, p< 0.05, where Y is serum zinc concentration in μg/dl and X is age in years).
2. Significant increase in taste-thresholds in every area with advancing age were obtained in both male and female subjects.
3. Denture wearers showed low value of serum zinc concentration (Male: 90.7 μg/dl, Female: 91.7 μg/dl) compared to young subjects (Male: 110.8 μg/dl, Female: 102.6 μg/dl).
4. Denture weares showed high value of taste thresholds (Anterior part of the tongue: 18.8 dB, Posterior part of the tongue: 15.8 dB, Soft palate: 18.9 dB) compared to young subjects (Anterior part of the tongue: 6.6 dB, Posterior part of the tongue: 7.6 dB, Soft palate: 8.8 dB).

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金属原型を用いた場合のポストの印象精度

依田正信

1989 年 33 巻 1 号 p. 143-157
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.143

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The purpose of this study is to investigate how differences in post shape, storage time and condition after removal affect impression accuracy with respect to dimension and shape. The following results were obtained for various elastic impression materials which were tested using a metal model with five different post shapes.
I. Alginate, polysulfide (regular type) and agar-agar showed substantial deformation due to undercut in post shape. Polysulfide (injection type) and polyether showed slight deformation due to undercut. Silicone (both condensation and addition types) showed very little deformation regardless of post shape.
2. As for elapse of time after removal, dimensions of all impressions decreased in varying degrees depending on type of materials.
3. When impressions were placed horizontally, increased deformation was observed as time elapsed with both the polysulfide and the alginate. Increased deformation was not observed with elapse of time for other impression materials.
While the above results show that accurate impressions with little deformation at time of and after removal are obtainable depending on the types of materials, nothing currently available fully satisfies the demand for the type of impression materials that would slightly decrease in dimensions with no deformation for best results. This finding indicates the need to develop new impression materials to better satisfy the demand.

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接着性補綴物が歯牙の動揺度と支持組織の負担力に及ぼす影響

篠原直幸

1989 年 33 巻 1 号 p. 158-169
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.158

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A mechanical simulation model of tooth and alveolar bone was made and analyzed using three-dimensional finite element technique. And the variations of tooth mobility and the periodontium supporting force caused by the absorption of alveolar bone was investigated.
The results obtained were as follows.
1. When the physiological tooth mobility was 150 μm, the teeth were sufficiently fixed using the resin-bonded splint and bridge connected with more than three teeth in the case of 40 percent of alveolar bone absorption. However in the case of 60 percent of alveolar bone absorption, the teeth were not fixed with splint and bridge of six teeth connections.
2. In the application of resin-bonded splint and bridge, when the metal frame thickness was 0.5 mm, the effect of the connected place on tooth mobility was large, and the abutment teeth were sufficiently fixed when the abutment teeth were connected up to the neck.
3. The periodontium supporting force decreased markedly according to the increase of abutment teeth.
4. When the abutment teeth were less than five teeth, the inhibitory action for tooth mobility of the resin-bonded splint and bridge was widely different, and resin-bonded splint was more effective compared with bridge.

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適合試験におけるホワイトシリコーンの平均被膜厚さ測定法の開発

森戸光彦, 米山喜一, 鶴岡美帆, 三輪悦子, 細井紀雄

1989 年 33 巻 1 号 p. 170-177
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.170

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A new system is developed for measuring the mean film thickness of the white silicone on the fitness test of the denture base. This system is based on analysing the B/W film density replaced from the thickness of the silicone.
The detective feature of this system is as follows:
1. An adequate correlation between the logarithm of the thickness of the white silicone and the logarithm of the B/W film density was estimated from the results of experimental values.
2. With use of the computer assembled into the system, it is capable to quickly process data.
3. Compared with the conventional method, the proper suggestion was gotten to the clinical data.
4. The system is available to use of investigating the bite force and the mean film thickness of the white silicone.

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上顎中切歯の歯髄腔形態のX線学的研究

玉澤佳純

1989 年 33 巻 1 号 p. 178-192
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.178

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The purpose of this study is to estimate the form of pulp cavities of upper central incisors using roentgenograms. Materials were fifty extracted upper central incisors.
First, roentgenograms of these materials were taken from labio-lingual and mesio-distaldirections. Then ten dentists read and traced the form of pulp cavities as shown by the roentgenograms, after which the percentage of readability was determined. Furthermore, the incisors were then cut in order to trace the actual form of pulp cavities and these tracings were compared with those made by the dentists as based on the roentgenograms.
It was shown by this study that the tracings of pulp chamber at the dental cervix based on the roentgenograms taken from the labio-lingual direction and the tracings at the horn of pulp chamber based on the roentgenograms taken from the mesio-distal direction closely approximated the tracings of the cut materials. It was also found that readability of these points was 100% for all ten dentists. Based on these results, the two above mentioned points were designated as the datum points to be used when estimating the form of pulp cavities. Furthermore, the form of pulp cavities of the cut teeth was concidered in order to determine the angle of the mesial and distal projection of the horn of pulp chamber against the datum plane of the dental cervix.
In the above manner, a possible method of estimating the form of pulp cavities of upper central incisors using two roentgenograms was investigated.

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前装用硬質レジンの色調に関する研究

上斗米博

1989 年 33 巻 1 号 p. 193-207
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.193

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Based on the viewpoint that stresses the importance of achieving natural colors and forms for veneer crown, four representative kinds of thermosetting resins were investigated colorimetrically in an attempt to clarify the relationship between the thickness and color of resins in opaque, dentin and enamel colors respectively. A spectrophotometer was used to measure the colors, the CIE colorimetric system employed to show the readings, and the CIE 1964 U*V*W* space was utilized to indicate the color differences, with the following results.
1. In the case of dentin, certain specific colors were observed for thicknesses of 1.3 to 1.8 mm when used alone, but when applied over opaque the range was 0.2 to 0.5 mm lower than when used alone.2. Enamel resins were grouped into two types according to different color groups, one group similar to achromatic color with low limpidity and the other similar to the dentin color with high limpidity. The former type became more grayer with an increase in thickness when applied over dentin. The latter type showed no difference in color even when the thickness increased.
This study has shown that the facing color results vary depending on the color properties of the different resins used. Therefore, it is advisable that careful consideration be given to these differencies in order to achieve the intended color facing.

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義歯性口内炎の臨床的研究

第1報デンチャープラークと義歯性口内炎との関係

小谷博夫, 貞森紳丞, 二川浩樹, 浜田泰三

1989 年 33 巻 1 号 p. 208-214
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.208

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Denture stomatitis is a very frequent complication of the denture wearers. In this study, the relation between denture plaque and denture stomatitis was evaluated by a simplified culture (STOMASTAT®). 583 patients wearing dentures (1981-1987) were selected, from 47 to 91 years old.
The following results were obtained.
1. Degree of denture plaque in 583 patients was severe, moderate, and no detection: 30, 35 and 35%, respectively.
2. Grade of denture stomatitis in 583 patients was severe, moderate, and no symptom: 24, 36 and 40%, respectively.
In this survey, the occurrence of denture stomatitis was about 60%.
3. The good correlation between degree of denture plaque and grade of denture stomatitis was recognized in this study.
The present results suggest that denture plaque plays an etiologic role in denture stomatitis and, in daily practice, it is important to instruct denture plaque control for denture wearers.

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咬合力による下顎の変位に関する研究

第2報穎頭の変位の分析

井上匡

1989 年 33 巻 1 号 p. 215-224
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.215

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Part of the biting force is believed to be transmitted to the temporomandibular joint and cause interarticular pressure. This pressure's degree and function, however, are not clarified. In this paper, I shall examine this pressure from condylar movement measured by the face-bow.
For the measurement of condylar movement caused by biting-pressure, I used an intraoral appliance which consisted of a pair of Co-Cr clutches and a pivot. While the patient exerted both maximum and medium biting force on the pivot located at the first molar, mandibular movements were measured.
Both sides of the condyle tended to move anterosuperiorly. Condylar movement averaged 0.29 mm on the working side, and 0.46 mm on the balancing side during maximum bite force. Distance and direction of the condylar movements were equal to the results of previous investigations, excepting the direction of working side condyle. The difference was considered to be primarily due to experimental variables.
The condylar movement during biting was smaller than that during pushing the jaw upward with manual forces. This suggests that interarticular pressure is only slight on both sides during first molar bite action.

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下顎運動の加齢による変化に関する研究

第1報矢状面内運動の分析

西克師

1989 年 33 巻 1 号 p. 225-236
発行日: 1989/02/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.225

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It is known that the temporomandibular joint changes with age. However, it isn't clarified yet how these changes affect mandibular movements. Therefore, I investigated the changes which occur in mandibular movement with aging.
This study details 62 cases whose age ranged from 20 to 79 years, and whose dentition was either complete or nearly so, and whose intercuspal position was firm.
First, I investigated the path of protrusive movement at representative points on the mandible, such as incisor, canine, first molar, second molar, the condylar center and the kinematic axis point. Results were as follows: 1) Data obtained from the 20 to 29 year old age group differed little from the results of previous investigations, 2) The sagittal inclination of the condylar path became less acute in subjects 60 years and over than in the younger subjects.
Second, I evaluated the vertical mobility of the condyle by the gap between opening path and closing path of the condyle in sagittal border movement and the location of the kinematic axis point. The results showed that the gap between the two paths of the condylar center was slightly larger and the kinematic axis point was tended to locate more anteriorly in subjects 50 years and up than in the others.

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1989 年 33 巻 1 号 p. 240
発行日: 1989年
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.33.240

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