日本補綴歯科学会雑誌

テーマ・セラミックス

福島俊士

1999 年 43 巻 2 号 p. 193
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.193

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歯科用セラミックスの理工学的性質

堤定美, 関野雅人

1999 年 43 巻 2 号 p. 194-202
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.194

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In the last couple of decades since the a11-or fu11-ceramic crowns in dentistry were proposed, the ceramic materials for dental restorations have been remarkably improved at the request of dentists and technicians from the point of view of improving esthetics and biocompatibility.
In this paper, the present situation of the dental ceramics with fabricating systems was reported focusing on their material properties, especia11y static and dynamic mechanical properties.

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歯冠色の構築からみたオールセラミッククラウンの特徴

石橋寛二, 永井成美, 照井崇之

1999 年 43 巻 2 号 p. 203-208
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.203

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A lot of all-ceramic crown systems have been developed in the last decade. Current all-ceramic crown systems show great mechanical strength compared with previous porcelain crowns. With regard to color reproduction of esthetic and natural tooth color, all-ceramic crown systems have an advantage due to the lack of a metal frame. This paper describes colorimetric indications related to the following points for color reproduction of all-ceramic crowns.
·oe Color space of natural tooth color
·oe Tooth color as the turbid-media
·oe Color reproduction with stratiformed ceramic layer
·oe Colorimetric properties of ceramic crown
·oe Color adjustability of luting resin cements
·oe Application of CCM for color reproduction

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キャスタブルセラミックス (OCC) への期待と現状

伊藤裕, 穂積英治, 山本司将, 阿部俊之, 橋本和佳

1999 年 43 巻 2 号 p. 209-216
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.209

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All-ceramic crowns and restorations have advantages of esthetic character, good biocompatibility and so on. Especially, the application of castable ceramics might bring about the profitable effect to fabricate each functional form of crown or other restorations because it can be applied to the lost wax process which has been used for the metal casting by dentists and dental technicians. However, all-ceramic crowns and restorations fabricated by castable ceramics also have the problems of fracture after each clinical application and limitation of use like the other types of ceramics. These problems and the latest improvement of Olympus Castable Ceramics (O.C.C.), based on our previous studies, are presented in this paper.

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オールセラミッククラウンへの期待と現状

セラミックスの加圧成型によりクラウンを製作するシステムについて

中村隆志, 六人部慶彦, 丸山剛郎

1999 年 43 巻 2 号 p. 217-224
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.217

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Since the 1980's, various kinds of all-ceramic crowns have been developed. These all-ceramic crowns have higher esthetics and biocompatibilities than conventional porcelain-fused to metal crowns. Among them, Empress (Ivoclar AG), a heat-pressed ceramic, is known as a material that can reproduce the color and light transmission of the natural tooth.
Empress is a leucite reinforced ceramic made by heat-pressing of glass-ceramic ingot with the lost wax technique. Empress provides two kinds of techniques, layering technique and staining technique. If the esthetic consideration is the most important like anterior teeth, the layering technique is the method of choice by cutting the labial surface and building up with enamel porcelain. Advantages of Empress crowns are as follows: 1) esthetical appearance similar to natural teeth, 2) enough resistance to masticatory forces, 3) excellent fitness, 4) less irritation to gingiva and soft tissue, 5) sufficient radiolucency and 6) less solubility and sufficient durability.
In clinical studies on Empress crowns, the sufficient success rate was registered when the adhesive technique was used. These results demonstrated that Empress could be reliably used to make single crowns.
Recently, Empress 2 was developed to fabricate all-ceramic bridges. Empress 2 consists of the lithium disilicate framework ceramic and the apatite layering ceramic. As a result, the Empress system is useful in anterior bridges as well as crowns, inlays and veneers.

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オールセラミッククラウンの各種支台に対する接着

安田登

1999 年 43 巻 2 号 p. 225-231
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.225

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Although all-ceramic crowns have been recognized as very good esthetic restorations, they need a great deal of tooth substance elimination and a sufficient crown thickness because they are brittle. Many strong and tough ceramics have been developed to overcome this weak point such as a core-strengthened ceramics and a castable glass ceramics. The progress of adhesive dentistry has subsequently contributed so that all-ceramic crowns have been widely used in daily practice. Strong bondings between all-ceramic crowns and abutment teeth as a dentinoenamel junction of the natural tooth have reinforced the brittleness of all-ceramic crowns. Many adhesive resins have been developed to bond restorations to tooth substances (enamel, dentin and cementum), dental alloys, ceramics and composite resins. These bonding systems, however, are very technique-sensitive and can not demonstrate the ability if not applied properly. The most effective surface treatment of abutments for ceramic bonding are presented in this paper.

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全身麻酔下でのCohen症候群患者のブリッジによる補綴治療の1症例

吉田隆義, 中村全宏, 北川尚, 真柳昭紘, 長谷川成男

1999 年 43 巻 2 号 p. 232-235
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.232

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The dental treatments of severely disabled patients who cannot understand the necessity of dental treatments are very difficult due to behavior problems. It is important to find solutions of oral hygienic problems for such patients who have muscle hypoactivity in the oral region and dislike teeth brushing. Removable prostheses are also not applicable to these patients because of lack of understanding and accidental swallowing. Therefore, treatment with a fixed prosthesis is effective. A Cohen syndrome patient was treated with an almost full fixed prosthesis having a small number of abutment teeth under general anesthesia at dental clinic of Tokyo Metropolitan Higashiyamato Medical Center for the Severely Disabled. The results were as follows:
1. In biting and occlusal adjustment, the mandible of the patient had to be guided to the proper mandibular position by the operator. It was effective to maintain the intercuspal position of upper and lower left second molar teeth during treatment. However, it was very difficult to judge whether the position guided to by the operator is appropriate.
2. Functional restorations including better posture, lip closure and swallowing were obtained after treatment.

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実験用口蓋床が味覚閾値に及ぼす影響

形態的要因について

古谷暢子, 野首孝祠

1999 年 43 巻 2 号 p. 236-243
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.236

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The purpose of this study was to investigate the cause of taste disorders of denture wearers. In this study, the following experiments were performed for twenty normal subjects with intact dentition and without taste disorders.
Five kinds of experimental plate were made; they were “Basic plate” covering the whole hard palate and “Half-covered plate” covering the anterior half of palate (thickness of both plates were 1.5 mm), “A-plate”(thickness of the plate covering the whole hard palate was 3.0 mm), “B-plate”(thickness of only front area of the plate was 3.0 mm), and “C-plate”(thickness of only around the posterior teeth area of the plate was 3.0 mm). After producing each palatal plate, the gustatory responses of salt and bitter tastes shown by the threshold of judgment were investigated by the chewing method. The gustatory test, masticatory efficiency and mandibular movement (Mandibular Kinesiograph, K 5 AR) during chewing gumi-jelly were investigated with and without each plate. The results were as follows:
1. The area of the plate was large or the thickness of the plate was not regular (B-plate and C-plate), the threshold of judgment was high and masticatory efficiency was low.
2. When wearing the plate, the opening phase time and cycle time were long and the stability of mandibular movement was disordered. These changes became notable when the area of the plate was large or the thickness of the plate was not regular (B-plate and C-plate).
These results suggested that masticatory movement and gustatory response could vary by change of shape and thickness of the palatal plate.

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口腔衛生に関する患者意識

患者の口腔衛生行為や義歯治療に対する満足度との関連性

堀田浩史

1999 年 43 巻 2 号 p. 244-250
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.244

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The purpose of this study was to investigate the characteristics of patients' consciousness of dental health, using the information obtained through the questionnaire that was reorganized from our previous study. Applying the quantification method of the third type, the patients' information obtained through the questionnaire was expressed in figures. In this study, the relationship between these scores and how well patients practice dental health or how satisfied patients are with prosthetic treatment with removable dentures was investigated.
The results were as follows:
1. The scores of patients' consciousness of dental health manifested the degree of patients' interest in dental health.
2. In the scores of patients' consciousness of dental health, a significant difference was observed according to the frequencies of patients practicing dental health (p<0.001).
3. Patients' satisfaction with prosthetic treatment with removable dentures was dependent on a high score of patients' consciousness of dental health.
4. It was considered indispensable to grasp the structure of patients' consciousness of dental health for empowerment on prosthetic treatment.

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接着性レジンセメントの接着強度に関する研究

セラミックコアーに仮着材が及ぼす影響

吉田剛, 小泉寛恭, 田中秀享, 桟淑行, 五十嵐孝義

1999 年 43 巻 2 号 p. 251-259
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.251

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Temporary cements and difference in the cleaning conditions exerted on adhesive strength of the adhesive resin cement and ceramic core were evaluated by performing shearing adhesive strength test, determing surface roughness and contact angle, and scanning electron microscopy (SEM).
The results were as follows:
1. Temporary cementation decreased adhesion strength in some cases, but no significant change was observed in various temporary cements.
2. As for the adhesion strength and the surface roughness, a relationship was not recognized.
3. Contact angles became large due to temporary cementation, and wetness declined.
4. Difference in the characteristic figures were observed by scanning electron microscopy after removal of temporary cements and cleaning method.
5. A method of cleaning temporary cements was expected for silane coupling treating after temporary cement removal by toothbrushing.

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レーザ溶接による高精度な歯科補綴装置の製作法に関する研究

氷見彰敏

1999 年 43 巻 2 号 p. 260-268
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.260

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In this study, the influences of fixation of soldering investment and post-heat treatment after welding on the prevention of the welding deformation were investigated by using a 3-unit bridge.
Moreover, the metal die for the welding and fixation bar were made for trial purposes to gain strong fixation, and they were used in the experiment. In addition, the deformations induced bywelding on a super hard stone model, soldering, and one-piece casting were compared with the result of laser welding.
The conclusions were as follows:
In the laser welding of Ag-Pd-Cu-Au alloy, thebest method of obtaining adental prosthesis with good agreement is post-heat treatment after welding, while its castings are fixed stronglytothemetaldiefor welding.
Moreover, the adaptability of the 3-uni tbridge that was welded by this method wasmoreexcellentthan that of the bridge made by soldering or one-piece casting.
As a result, welding on the super hard stone model was undesirable, because large transverse shrinkage was induced and it was not possible to heat-treat it after welding because it was fixed.

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チタン焼付用陶材の破壊靱性, 色調と焼成収縮に及ぼす焼成条件の影響

大津光寛, 新谷明喜, 横塚繁雄

1999 年 43 巻 2 号 p. 269-278
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.269

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An experiment was conducted to determine fracture toughness, color stability, and firing shrinkage of porcelain-fused-to-titanium in relation with firing conditions. Titanium (VT), Duceratin (DD), Titanbond (OT) and Titan (NT) were examined under firing temperatures of 10, 20, and 30°C higher than the reference temperature, respectively, with either 1, 3, or 5 rounds of firing.
The results were as follows:
1. With the rise in firing temperature, the fracture toughness level was decreased in VT and increased in NT, while the level remained constant in DD and OT. Repeat firing also influenced the fracture toughness level, which was reduced in VT and OT with increasing number of firings, though the level remained constant in NT and DD.
2. When the color obtained at the reference firing temperature was regarded as the standard color, the color difference ΔE^* from the standard was observed in all except for VT at 10°C higher than the reference temperature. In addition, when the color obtained by one firing was taken as the standard color, the color difference ΔE* from the standard was recognized in all repeat firings.
3. The degree of linear shrinkage was increased in VT and decreased in NT, with the rise in firing temperature and increasing number of rounds of firing, but it remained constant in DD and OT.

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射出成形法によるマイクロ波重合型レジンで作製した上顎総義歯の重合に伴う寸法変化

小柳進祐, 王暁容, 高橋裕, 羽生哲也

1999 年 43 巻 2 号 p. 279-285
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.279

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The dimensional changes of denture base of maxillary complete dentures following polymerization were measured by using sa three-dimensional measurement system. The maxillary complete dentures processed with injection type microwave-cured resin, conventional type microwave-cured resin and heat-cured resin were compared. Within the conditions imposed in the study, the results were as follows:
1. The maxillary complete denture processed with injection type microwave-cured resin showed minor dimensional changes compared with that processed with heat-cured resin and conventional type microwavecured resin after deflasking.
2. The denture processed with injection type microwave-cured resin showed a gradual dimensional change after deflasking up to 3 or 4 weeks.

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硬質レジン歯を支台歯に接着固定するブリッジの研究

接着耐久性に関する実験的評価

中島由佳, 嶺崎良人, 宮里ありさ, 梶原浩忠, 木村孝広, 南弘之, 鬼塚雅, 田中卓男

1999 年 43 巻 2 号 p. 286-292
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.286

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The adhesion fixed partial denture applied resin teeth as pontic, i.e., adhesionpontic bridge, is effective prosthodontic treatment to conserve the tooth substrate of intact abutment teeth.
The purpose of this study was to improve the bond strength and durability between adhered pontic applied composite resin teeth and abutment teeth. At first, the bond strength of resin teeth pontic bonded to extracted human teeth with two self-curing resin adhesives were measured after thermocycling test up to 50, 000 times, and the specimen bonded with Super-Bond C & B showed higher bond strength than with Enamagic. However, the bond strength with Super-Bond C & B after thermocycling 50, 000 times decreased to about30% of the value before thermocycling, and the failure of all specimens occurredat the adhesion interface between composite resin teeth and Super-Bond C & B.
Then some methods to reinforce the bonding durability of Super-Bond C &B to composite resin teeth were evaluated. The highest bond strength was obtained in the specimen with the hole in the proximal plane of composite resin teeth.
The results suggested that the combination of mechanical retention and bond applied resin adhesives is effective to achieve the durable bond and lengthen thelife of adhesion pontic bridge.

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顆路傾斜角が関節円板前方転位に及ぼす影響

金村清孝

1999 年 43 巻 2 号 p. 293-298
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.293

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To understand the relationship between anterior disc displacement of temporomandibular joint and condylar guidance inclination, condylar movements were analyzedin 100 outpatients (27 males and 73 females, mean age: 33.6 y). To avoid the effect of contralateral condylar movement, the condylar point on the nonworking side was selected to obtain the changes of inclination for every 1.0 mm during lateral excursion.
Articular disc positions were determined in MR images both in saggital and coronal sections.
The results were as follows:
1. Steep inclination of condylar guidance could be one of the intrinsic factors of anterior disc displacement of the temporomandibular joint.
2. Inclination of condylar guidance only showed statistical significance between patients with disc displacement and those with normal disc position in the range of condylar movement from intercuspal position to 3.0 mm.
3. There was no significant difference in inclination of condylar guidance between anterior disc displacement with and withoutreduction, as well as between degrees of displacement.

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歯の喪失が高次脳機能に及ぼす影響に関する行動学的, 組織学的研究

千葉晃

1999 年 43 巻 2 号 p. 299-311
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.299

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The purpose of the present study was to investigate changes in spatial learning and memory in mice after extraction of maxillary and/or mandibular molar teeth, in addition to investigating the neural mechanisms underlying that change.
Male ddY mice, 30 weeks old, were used. In each experimental group, the molar teeth on both sides were extracted as follows: Maxillary, mandibular, both maxillaryand mandibular, and no extraction group as control. Spatial learning and memory were measured by performance in an 8-arm radial maze 1, 7 and 20 weeks followingextraction. Following completion of these behavioral tests on all four groups, histological investigation was carried out by pyramidal cell count of tissue samples (Nissl staining) from the frontal section in CA 1, CA 3 and CA 4 of the hippocampus.
The experimental group showed significantly slower search times and an increase in error rate, compared to the control group. The experimental groupshowed a significant decrease in the number of hippocampal pyramidal cells compared to the control group. A further decline in both spatial memory and the number of cells was observed, especially in the maxillary molar loss group.
In conclusion, it was found that spatial memory and neurological changes of the brain were impaired by the loss of tooth after a long time.

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義歯Qualityが総義歯装着者の咀囎筋断面積の減少に及ぼす因子

田邊忠輝, 虫本栄子, 田中久敏, 井上大一, 遠藤義樹, 長谷剛史, 山田芳夫

1999 年 43 巻 2 号 p. 312-320
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.312

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The objective of this study was to determine whether denture quality might have an effect on masticatory muscle cross-section in the complete denture wearer.
Seventy complete denture wearers were equally divided into a higher denture quality group (G 1) and a lower denture quality group (G 2) by using denture quality scale, described as 16 categories, which related to denture form, mandibular position, clinical findings, etc. The denture quality score for G 1 were significantly higher than G 2. MRI was used to analyze the masticatory muscle cross-section area. Masticatory muscle activity, during voluntary maximum clenching, was measured electromyography. Facial morphology was measured using cephalometric radiography. There was a significant reduction of the masticatory muscle cross-sections (masseter, temporalis posterior and medial pterygoid) as well as masticatory muscle activity (masseter, temporalis posterior) in G 2 (p > 0.05, ANOVA). G 1 showed a significant positive correlation between cross-section and masticatory muscle activity (r=0.393, p > 0.05), however, G 2 showed no correlation. In conclusion, denture quality was a significant factor in reduced masticatory muscle cross-sections and decreased muscle activity. In elderly edentulous patients, a complete denture with higher quality could help maintain masticatory muscle cross-section and activity.

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咬合紙記録における咬合接触像の評価

池田隆志, 首藤謙一, 坂東永一, 松浦広興, 安陪晋, 三好礼子, 山内英嗣, 森木裕貴, 中野雅徳

1999 年 43 巻 2 号 p. 321-327
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.321

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In this study, occlusal contact image on articulating paper record in the intercuspal position was clarified about the relation with occlusal adjacent portion determined from black silicone record and difference of reproducibility by the recording methods. Four kinds of recording methods, 3 times tapping, 3 times tapping with a middle clenching, 5 times tapping and 5 times tapping with a middle clenching, were examined. The occusal contact image of the first molar was changedto a binary image and analyzed via the personal computer.
The results were asfollows: 1. There was no significant difference between the area of occlusal contact image by each method. 2. In all methods, the coefficient of correlation between the area of occlusal contact image and occlusal adjacent portion increased according to the increase of the binary threshold of the occlusal adjacent portion. 3. For the correlation between the area of occlusal contact image and occlusal adjacent portion divided every 10μm (up to 40μm), the coefficients of 10-20μm and 20-30μm were successful. 4. There was no influence of the number of tapping times on dispersion of the area of occlusal contact image, but the dispersion decreased by clenching.
Finally, an occlusal contact image could be influenced by dynamic change of occlusal contact, and the recording method that includes clenching has high reproducibility.

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咬合接触部位の違いが側方クレンチング時の下顎の変位に及ぼす影響

馬場一美, 湯上圭, 屋嘉智彦, 秋重智司, 羽毛田匡, 藍稔

1999 年 43 巻 2 号 p. 328-334
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.328

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To investigate the relationship between occlusal scheme and joint loading, mandibular displacement was measured during lateral clenching under experimentally altered occlusal conditions. Acrylic occlusal devices were fabricated for the lower working-side canine, working-side second molar, and balancingside second molar. With the aid of these devices, various occlusal states were simulated. Eight healthy subjects volunteered for this study and performed clenching tasks. Vertical displacements of the mandible were recorded by linear variable differential transformers, and the results were as follows:
1. Clenching efforts in the lateral mandibular position caused elevation of the mandible.
2. When a single occlusal device was placed unilaterally, the amount of the upward displacement near the supporting tooth tended to be smallest.
3. Insertion of three occlusaldevices (bilateral tooth contacts) reduced the amplitude of mandibular displacement.
These results suggested that the nature of reaction forces at the temporomandibular joints caused by the elevation of the mandible would be influenced by the occlusal status.

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新規シリコーンラバー系軟質裏装材デンチャーリライニングと各種床用材料との接着強さ

廣瀬英晴, 井上豊仁, 山中信幸, 林純子, 大木裕玄, 西山實

1999 年 43 巻 2 号 p. 335-343
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.335

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The tensile bond strength (TBS) to denture base materials of silicone-rubber soft relining materials (DRS: Denture Relining Soft type, GC) immersed in water at 37°C from 1 day to 8 weeks was investigated. Four denture base metals (18 K-Au alloy, Ag-Pd-Au alloy, Co-Cr alloy and Pure Ti) and two denture base resins (polycarbonate resin and polysulfon resin) were used. The TBS of DRS was 1.39-2.05 MPa to denture base metals and 1.59-1.81 MPa to denture base resin after 1-dayimmersion, and 1.59-2.75 MPa and 1.47-2.33 MPa respectively after 8-week immersion. These values were significantly superior to those of two ordinary silicone-rubber relining materials.

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上顎第一小臼歯の運動の6自由度測定と解析

薩摩登誉子

1999 年 43 巻 2 号 p. 344-354
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.344

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Soundness of stomatognathic system can be achieved with a functionally adequate occlusal contact. A study on this occlusal morphology requires the analysis of micro tooth movement as well as analysis of jaw movement. The purpose of this study was to investigate micro upper first premolar movement under several occlusalloading conditions. Our jaw tracking device was modified to develop the new motion analyzer in six-degree-of-freedom that can perform simultaneous measurement of tooth and jaw movements.
The results were as follows:
1. The resolution of the recording system was improved up to 1.3 μm for translation and 0.00017° for rotation.
2. Three male adult volunteers were selected as the subjects. Movements of right upper first premolars against left upper first premolarsof these subjects were measured with this device. Occlusal load was provided perpendicularly on buccal cusp, central fossa, palatal cusp and canine cusp. Directions of tooth movements of these subjects were almost the same under the same loading conditions.
3. In some loading conditions, the rotation centers of tooth movement were found.

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高機能金合金焼付用陶材の破壊靱性値に及ぼす焼成回数・焼成温度の影響

今村健, 新谷明喜, 横塚繁雄

1999 年 43 巻 2 号 p. 355-362
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.355

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The purpose of this study was to investigate the effects of firing conditions onfracture toughness. Three commercially available porcelains for high functional gold alloys, Carrara (CA), Deguceram Gold (DE) and Duceragold (DU), were used. In experiment 1, fracture toughness was investigated under firing treatment of 1, 3, or 5 times and firing temperatures of 0, 20, and 40°C higher than the manufacturers' standard temperature (CA: 845°C, DE: 780°C, DU: 780°C). In experiment 2, the effects of the mooring procedure on fracture toughness was investigated.
The results were as follows:
1. No difference was observed among fracture toughness of firing times in CA and DU, but fracture toughness wasincreased in DE with repeated firing. The maximum value of fracture toughness was 1.96±0.5 MNm^-3/2 in DU with firing treatment of three times and the standard temperature. The minimum value was 1.35±0.12 MNm-3/2 in DE with firing treatment of once and 20°C-higher temperature.
2. There was nodifference between fracture toughness in DE and DU before and after mooring.

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空間記憶学習能の評価に用いる各種迷路装置の検討

田中久敏, 虫本栄子, 千葉晃, 岩渕安信, 猪苗代盛昭

1999 年 43 巻 2 号 p. 363-372
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.363

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The purpose of this study was to compare the effectiveness of two types of mazes, multiple maze and 8-arm radial maze, in relation to age and sex difference, onthe acquisition of spatial learning and memory in mice, in addition to estimating memory retention.
Three groups of male and female ddY mice were used: 4 weeks old (Young group), 7 weeks old (Adult group), and 82 weeks old (Aged group).Spatial learning and memory were measured by performance in both mazes.
Differences between search times and the error rate study in all groups could not be detected in the multiple maze acquisition. Furthermore, a study using a simplified multiple maze showed that there was no significant difference between groups during memory retention tasks.
As for search times using an 8-arm radial maze, the aged group showed significantly slower time compared to other groups, and the aged female group showed significantly slower time compared to the aged malegroup, but these results were not in accordance with the error rate. However, studies using the 8-arm radial maze could show data that aged groups and female mice experienced decreased memory retention compared to other groups.
The present study confirmed that an 8-arm radial maze could be helpful in the retention of spatial learning and memory.

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電気刺激に伴う下顎上下移動の分析による咀嚼筋緊張の評価

高木一徳

1999 年 43 巻 2 号 p. 373-382
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.373

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Masticatory muscle tone was investigated by analyzing vertical mandibular movement with electric stimulation. Healthy subjects and patients with type I TMD wereexamined. Under various conditions, masticatory muscle tone was evaluated by recording vertical dimension and velocity of mandibular movement.
The results were as follows:
1. Ten stimulations were applied with the mandible in the resting position. The descending dimension and maximum velocity of descent were measured.
2. The mental anxiety of the subjects only slightly affected the mandibular movement with electric stimulation.
3. Both parameters were lower in TMDpatients than in healthy subjects.
4. Both of these values were lower before treatment for TMD than after treatment, and the values after treatment became similar to those in healthy subjects.

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両側遊離端欠損症例に応用したITIインプラントの長期経過の1例

10年経過の臨床的評価

藤関雅嗣

1999 年 43 巻 2 号 p. 383-384
発行日: 1999/04/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.43.383

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