日本補綴歯科学会雑誌
Online ISSN : 1883-177X
Print ISSN : 0389-5386
ISSN-L : 0389-5386
33 巻, 4 号
選択された号の論文の20件中1~20を表示しています
  • 下顎片側性遊離端欠損症例における印象圧の相違による影響について
    楳津 徳弘
    1989 年 33 巻 4 号 p. 757-770
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The purpose of this paper is to investigate the difference of impression pressure under denture bases made by the pressure impression-taking method, which considers the resiliency of ligaments under abutment teeth and mucosa under dentures, and under those made by the non-pressure impression-taking method, and then analyzed its influence on the distribution of pressure curve produced by bite force with the case of unilateral mandibular free-end edentulousness. The findings were as follows:
    1. As for the pressures under the dentures, dentures made by the pressure impressiontaking method in all cases showed an apparent increase at the mesial part, while at the distal part, a decrease was detected in three out of five patients.
    2. The pressure curve caused by bite force tended to rise sharply immediately before the application of maximum bite force.
    3. Ratio of pressures resulting from the increased bite force tended to increase with dentures using the non-pressure impression-taking method, while dentures using the pressure impression-taking method showed a clear tendency to equalize toward 0.5, regardless of the values of the bite force.
  • 上顎前歯部について
    石崎 隆弘
    1989 年 33 巻 4 号 p. 771-785
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    This research used the spectroradiometer (Pritchard Model 1980 B) to measure the spectral radiance factors of women's maxillary anterior teeth. The following conclusions were reached:
    1. The spectral distributions of the anterior teeth were all similar at the cervical, middle, and incisal areas respectively. Their spectral distributions ran in parallel at an almost equal distance, with the curves for the central incisor at the top, below which were those for the lateral incisor and the canine, respectively.
    2. The spectral distribution of each area of the central incisor, lateral incisor, and the canine showed their respective distribution curves. The trends of these curves were almost the same for all areas of each tooth.
    3. The spectral distribution of each measured portion for women resembled the corresponding portion for men. However, with the central incisor, the spectral distribution curves for women were in a higher position than those for men. With the lateral incisor and the canine, the spectral distribution curves for men were in a higher position than those for women.
    4. The spectral distribution of the cervical area showed some absorptional bands, which were identical to those of hemoglobin.
    5. Research of the spectral distribution of natural teeth is judged to be helpful in resolving the problem of metamerism.
  • 川崎 彰人, 河野 敬一, 寺田 善博, 平安 亮造
    1989 年 33 巻 4 号 p. 786-790
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The interaction of Hydroxyapatite (HAP) with organic molecules is of biological importance, since the former is considered as the prototype mineral found in calcified tissues, such as bone and teeth. Some proteins display a high affinity for HAP and they are involved in the mineralization of bone.
    Another important aspect in biological systems is the role that various molecules play as inhibitors of crystal growth.
    We investigated the interaction of HAP with amino acids and thier derivatives by comparing HAP adsorption experiment with crystal growth experiment. It was reported aspartic acid or phosphoserine adsorbed onto HAP and that they inhibited the seeded crystal growth. In this work, histidine and imidazole derivatives also displayed the crystal growth inhibitory activity and its adsorption isotherm was described by a Langmuir-type model.
  • 今岡 勢喜, 小澤 隆幸, 齊藤 実, 田中 茂生, 日比野 和人, 蛭川 登夫, 平沼 謙二
    1989 年 33 巻 4 号 p. 791-803
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The present report discusses our new simplified measuring method of masticatory efficiency by counting particles in the matter of making test materials and the standard equation for subjects with normal dentition.
    1. Two kinds of hydrocolloid impression materials, reversible and irreversible, were used as the test materials.
    2. For evaluating the shape of test materials, 12 subjects with normal dentition were tested and for calculating the standard equation, 108 subjects with normal dentition were tested.
    3. Each subject was investigated by the simplified method of counting particles through a sieve system. The number of remaining particles on the mesh was calculated as a masticatory performance.
    4. As indicated in a previous report by Dr. Ozawa about cubical test materials, columnar test materials are easier to make than the others and these were avairable for the present particle counting method for investigating masticatory efficiency.
    5. We obtained the standard equation for both kinds of test material using 108 subjects with normal dentition.
    To simplify the measuring method, we selected the standard equation of a 5-mesh sieve with 10 strokes chewing for the index of masticatory efficiency. The standard equation of a 5-mesh sieve for both test materials are as follows;
    1) Reversible hydrocolloid test material:
    Y=-1.605X+29.058
    2) Irreversible hydrocolloid test material:
    Y=-1.116X+23.868
    6.5, 10-mesh sieve with 10 strokes chewing showed the smallest variation in the individual coefficient of variation with both kinds of test material.
  • 第2編周波数パラメータについて
    徳永 徹
    1989 年 33 巻 4 号 p. 804-817
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    During sustained isometric contraction of the jaw muscles, muscular fatigue causes a shift towards lower frequencies in the EMG frequency power spectrum. This shift is due to a reduction of myoelectric conduction velocity. The purpose of this study was to investigate the effect of surface electrode location on the estimates of frequency components, and to determine the appropriate frequency parameters of surface EMG which provided the best fit when comparing conduction velocity. Studies were performed in the masseter muscles of 8 healthy subjects. The myoelectric potentials were derived using 12 differential amplifiers from electrode arrays. The frequency parameters calculated were as follows: peak frequency, mean power frequency, cumulative power function (10, 25, 50 and 75%), median frequency ratio, low frequency ratio and measure H.
    As the results, following findings were obtained:
    1. The high frequency content occurred at the region of end-plate zone and tendonous insertion of the muscle.
    2. EMG spectra obtained during fatigue were shifted to lower frequencies for all regions except adjacent end-plate zone.
    3. The relationships between conduction velocity and frequency parameters during fatiguing contractions were almost linear except peak frequency.
    4. It was concluded that the location between distal end-plate and the tendon was“stable”zone for studying muscular fatigue.
  • 第1報製作過程における応力変化
    寺田 善博, 江頭 有三, 平安 亮造
    1989 年 33 巻 4 号 p. 818-821
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The radiograph stress measurement method is the only known means of a non-destructive measurement, and this method is used to assess the residual stresses of various metals.
    This study was made to evaluate the possibility of radiograph stress measurement of the metallic denture base formed by the wire explosion energy. Radiograph stress measurements of stress changes during various stages of manufacturing metallic denture base were successfully obtained.
  • 西川 啓介
    1989 年 33 巻 4 号 p. 822-835
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    Jaw movement in six degree-of-freedom and 8 ch EMG of masticatory muscles were studied in 9 subjects to investigate the influence of occlusal contact on jaw function. The results are as follows.
    1. The border jaw movement and the chewing movement changed according to the change of occlusal contact.
    2. The toothcontact on balancing side is not good for jaw function because of two following reasons. First, tooth contact on balancing side limited the border jaw movement.Second, tooth contact on balancing side decreased jaw closing muscle activities of non-chewing side.
    3. Existence of craniomandibular control system that controls jaw function under the influence of central nervous system and peripheralsystem was suggested.
  • 多田 望
    1989 年 33 巻 4 号 p. 836-847
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    Through simulation method, the influences of occlusal force loading point, posterior pontics arrangement, palate thickness and denture base material on pressuredistribution over supporting tissues under maxillary complete denture were studied.
    The results were the following:
    1. Pressure distribution over supporting tissues showed remarkable variation according to the position of the occlusal force loading point.
    2. Pressure on the buccal side of the alveolar ridgewas greater in the buccally shifted arrangement of posterior pontics than in thestandard and lingually shifted arrangements.
    3. Reduced palate resin thickness below normal value increased pressure on the palate midline region.
    4. For the standard and lingually shifted arrangements of posterior pontics, pressureon the incisor and palate midline regions is decreased in metal base compared toacrylic resin base. In the buccally shifted arrangement, pressure on buccal sideof the alveolar ridgeis lesser in metal base than in acrylic resin base.
  • 顔面形態の変化に対する注視点の動向について
    本間 秀裕
    1989 年 33 巻 4 号 p. 848-862
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The following experiment was designed to investigate the affects of eye movements in visual performance on alternation of the facial appearance using Vision analyzer.
    Major concern in this study was whether a casual relationship betweeneye movements and alternation of the facial appearance could be established suchthat eye movements necessarily preceded an alternation of the stimulus perception.
    Nine students who did not have any dental education and three dentists were selected as subjects.
    Three stimuli were presented to subjects which weremade of the full face photographic slide of adult male with two different vertical dimension of occlusion in complete upper and lower dentures and normal facialheight. Subjects were first shown in the normal stimuli, then they were presented with differnt version of the stimuli and asked to record their percept.
    Tow condition of instructions were used which elicited differnt scanning patterns.
    The results were as follow
    1. Evidence that individual differences in eye movement patterns were existed.
    2. Before instruction, their eye movementsin visual performance tend to be dispersed all over the face.
    3. After instruction, they were able to clearly identify altered facial appearances with good understanding of anatomical facial form.
    4. Dentists were able to evaluate the altered facial appearances focusing their anatomical knowledge.
    The present investigation has demonstrated that the study of eye movements scanning strategies involved in two-dimensional face comparison and recognition is fruitful area of research.
  • 堀内 政信
    1989 年 33 巻 4 号 p. 863-877
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The purpose of this study was to investigate the influence of the alteration of palatal form on pronunciation.
    Three types of artificial palatal plates simulating the upper complete denture, which artificial posterior teeth position wasmore lingually than natural dentition, were made foreach dentulous subject.
    Difficulty of articulatory movements and sound qualities were assessed when the subjects pronounced/sa/, /si/, /ka/, /ki/, /ci/, /hi/, and/ri/with each plate. The distortional sounds judged by auditory psychological experiment were analysed by acoustic methods, and mandibular movements during pronunciation of them were measured.
    Results
    1./ki/and/hi/were affected remarkably when the posterior position was more lingually, and /ri/, /ci/and/sa/were also affected.
    2. The acoustic characteristics of distortional sounds were estimated by peak trajectories, supectrum envelopes, peak frequencies and sound waveforms of consonant parts, formant frequencies and formant trajectories of following vowels, and segmental durations.
    3. Mandibular movements did not influence directory on the acoustic characteristics of distortional sounds. It was thought that tongue and lipsmainly influenced on those.
  • 後藤 英伸, 堀田 浩史, 白石 和宏, 山辺 芳久, 藤井 弘之, 永野 清司
    1989 年 33 巻 4 号 p. 878-884
    発行日: 1989/08/01
    公開日: 2010/11/26
    ジャーナル フリー
    This study was made to clarify the retentive force of a denture retainer, i.e., a cone-type stud and sleeve attachment. In order to measure the wearing effect, an engaging and disengaging cycle test of 1, 000 times was performed. The effectsof taper angle (cone angle), sleeve height and thrusting force at engaging stud and sleeve on retentive force were also analyzed.
    1. The cycle test had little effect on the retentive force (P∼0.41).
    2. The retentive force became greater with decrease of taper angle (P<0.0001, Fig. 4).
    3. The effect of the sleeve height on retentive force differed with taper angle (P>0.0001, Fig. 6).
    4. The retentive force became greater with increase of thrusting force (P=0.0009), and this effect was greater as the taper angle decreased (P<0.0001, Fig. 5).
    5. The contributions of the factors were approximately 38% intaper angle, 30% in thrusting force and 2% in sleeve height (Table 1).
    6. Itcould be interpreted that we had better use the retainer with taper angle of 6 to 8 degrees, although the retainer with taper angle of 5 degrees could be applicable to the tooth on which the less occlusal force transmitted.
  • ノンプレシャスメタルについて
    萩原 芳幸
    1989 年 33 巻 4 号 p. 885-898
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The purpose of this study is to measure the three-dimentional displacement and distortion in the Non-precious (Ni-Cr) ceramometal bridges during laboratory procedure.
    At the time of pre-soldering stage, the author examined the phosphatic investment (low and high thermal expantion: ph, ps) to addition of gypsum investment which was usualy to used to fix the position for soldering.
    The following results were obtained.
    1. The displacement of the framework at the pre-soldering stage, in case of using phosphatic investment mixed by water (ph), it was small on the horizontal and vertical plane. And in the other case of mixing by 100% colloidal silica (ps), a kind of displacement was seen where the curve of the bridge opened as result of the position of two soldering bodies getting out of order from each other.
    So that phosphatic bonded investment, it can be used to because thermal expantion can be controlled, the soldering block.
    2.Throughout the surface grinding of framework to grazing, displacement was minimal, at the time of opaque porcerain firing, the curve of the bridge closed but ithad no effect on clinical adaptation.
    3. In the case of assembling multi-unit non-precious ceramometal bridge mainly the displacement caused at pre-soldering stage, so it is important to check the adaptation after soldering.
  • 宮内 修平, 桑原 俊也, 丸山 剛郎
    1989 年 33 巻 4 号 p. 899-910
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    In our previous study, we concluded normal subjects did not present an abnormal morphology of condyle, while 30% of stomatognathic dysfunction patients revealedabnormality, and especially about 20% presented atrophy. In this study, we selected 146 patients with stomatognathic dysfunction and analysed patients with atrophy in condyle comparing patients without atrophy. We obtained following results.
    1. 37 patients (25%) with dysfunction showed atrophy in condyle. Among them, 15 patients showed bilateral atrophy, and 22 showed unilaterally.
    2. Among 22 patients with unilateral atrophy in condyle, 15 patients (68%) showed correspondence between symptomatic side and atrophy side.
    3. Among 37 patients with atrophy in condyles, 30 patients (81%) showed organic changes in TMJ components.
    4. Mean age of atrophy (+) group was significantly younger than that of atrophy (-) group.
    5. No significant relationship was observed between the distinction of sex and atrophy existence in condyle.
    6. Significant relationship was observed between loss of lower first molar and atrophy existence in condyle. Most of the patients of atrophy (+) group lost their lower first molars in growth period of TMJ components from mixed dentition through puberty and left them without restoration.
  • TS 200 Data系列の判別分析
    藤本 明伸
    1989 年 33 巻 4 号 p. 911-923
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    This paper represent one of the important index of gingival color to various conditions. Generally the gingival color is very difficult problem to measure, so experimental gingivitis has to be treated by special technique such as Discriminant Analysis in spectrum pattern analysing.
    On measuring gingiva, Standard Measuring System is used in our department. Tissue Spectrum Analyzer TS-200 is used for measuring gingival color and spectrum pattern. Spectrum patterns are classified by its strength into three cathegories, that is Normal, Slightly-Redness and Redness. Discriminant Analysis and Graph Analysis (Constellation Graph) showed each group of property.
    The following results were obtained; Spectrum patterns have two peaks, that is 542 nm and 577 nm. With gingivitis change on three steps, that is Normal, Slightly-Redness and Redness, spectrum powers and difference of absorption in spectrum degrees and brightness is down. With gingivitis change, the Z1 value was obtained by Discriminant Analysis and showed a tendency to sign change from minus to plus. In the result of Discriminant Analysis distinction rate is 97.4% in N Group, 98.5% in SR Group and 100% in R Group. Constellation Graph represented each group of property clearly.
  • 伊谷 充礼
    1989 年 33 巻 4 号 p. 924-937
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The purpose of this study was to represent the amount of the vibration as a response in experimental full crowns that occurs at a shock impulse and to offer therelation between the response and abutment forms. Several authors have reported the use of shock forces as a method of prosthetic vibration reserching, but in those cases the importance is to require how to gain the REAL SHOCK. The author used two types of shock apparatus and obtained the optimal shock force in the experimental crown vibrations. Shock response increased as input increase, but the response decreased at the maximal point.
    Optimal shock was obtained at the condition, that is, 195.56 gr Ecm/sec. in momentum. Experimental crown response was related to the contact area of the crown and abutment. Decayed abutments decreased the value of the optimal shock force.
  • 前頭面における咀嚼運動パターンの分類について
    宮内 修平, 中南 匡史, 西尾 公一, 丸山 剛郎
    1989 年 33 巻 4 号 p. 938-951
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    Occlusion is one of the most important factors to affect chewing movement.
    In this study, chewing movements of subjects who have posterior crossbite were recorded to analyze the relationship between chewing pattern and crossbite occlusion.
    Chewing movements of 22 subjects of posterior crossbite and 5 normals were recorded with Sirognathograph Analysing System II. Subjects were to chew softgum; on each specified side, both at the posterior crossbite region and at another resion of the side. On the other hand, normal subjects were to chew only on each side. Chewing patterns were classified into several specific ones examined with chisquare test concerning the relationship between chewing pattern and occlusion.
    From the results we obtained following conclusion.
    1. Frequency ofnormal chewing pattern, posterior crossbite group is lower than normal group.
    2. Among the posterior crossbite group, specific patterns are found with highly frequency such as 'Concave Type', 'Crossover I Type', 'Crossover II Type' and 'Reverse Type'.
    3. By segmental chewing at the posterior crossbite region, 'Normal Type' and 'Concave Type' are lower and 'Crossover I Type', 'Crossover II Type' and 'Reverse Type' are higher in frequency in comparison with posterior crossbite side voluntary chewing.
    4. By segmental chewing at the posterior crossbite resion, 'Normal Type' and 'Concave Type' are lower and 'Crossover I Type', 'Crossover II Type' and 'Reverse Type' are higher in frequency in comparison with segmental chewing at non-crossbite resion.
  • 第1報二次元非線形弾性解析の導入
    野川 哲義
    1989 年 33 巻 4 号 p. 952-965
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    Recently there have been a number of studies concerning the dynamic behavior of removable partial denture under the loading, but none of previous studies have dealt with non-linear analysis.
    The purpose of this study is to demonstrate the usefulness of two-dimensional non-linear analysis. The behavior of abutment teeth and saddle in relation to the distribution of force on the teeth and the supporting tissues are the objects of this analysis. In this study, a comparative analysis between non-linear and linear analysis was performed utilizing finite element method. The results were as follows.
    1. A two-dimensional model simulating the behavior of teeth and the supporting tissues in vitro could been made by changing the values of the Young's modulus and Poisson's ratio of the periodontal membranes and the mucosa of edentulous alveolar ridge at two stages.
    2.In the conditioned high loading (5 kg), displacement of abutment teeth and saddle in the linear analysis was larger than that of the non-linear analysis.
    3.In the conditioned high loading (5kg), the distribution of the force on the mesial abutments in linear analysis was larger than that of non-linear analysis.
    The results of this study suggested that the non-linear analysis was desirable in the conditioned masticatory and biting force.
  • 第1報 合着用セメントおよび支台築造用コンポジットレジンの圧縮強さについて
    宮本 諭, 高川 徹一, 野崎 顕, 谷中 信彦, 中村 善治, 今井 敬晴, 野口 幸彦, 花村 典之
    1989 年 33 巻 4 号 p. 966-976
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    In this study, we investigated compressive strength of various luting cements and composite resin cores in both dry and wet condition, and then influences of repeating load on compressive strength in wet condition of distilled water at 37.
    As frequency of repeating load increased, compressive strength of all materials decreased. It means that the repeated load cycling test used in this studyis adequate for evaluating durability of various dental materials.
    The results were as follows:
    1. In the condition of no loading in both dry and wet condition, resin cement indicated the highest compressive strength of all cements examined and was followed by glass ionomer cement, zinc phosphate cement and polycarboxylate cement. Glass ionomer cement was notably influenced in wet condition.
    2. After 10, 000 cycles of loading in wet condition, resin cement indicated the highest compressive strength again and was followed by glass ionomer cement, polycarboxylate cement and zinc phosphate cement. In particular, compressivestrength of zinc phosphate cement decreased remarkably.
    3. In the condition of no loading, visible light-cured composite resin core was superior to chemicalone. Visible light one was notably influenced in wet condition.
    4. After 10, 000 cycles of loading, visible light-cured composite resin core was superior to chemical one.
  • ラバー系印象材の種類とトレー形態の影響
    石田 和弘
    1989 年 33 巻 4 号 p. 977-990
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    The purpose of this study was to investigate and compare the accuracy of complete dental arch impressions and stone casts made from two kinds of impression materials (addition type silicone and polysulfide rubber) and trays (custom tray andmodified custom tray).
    In addition, the effect of quantity of gypsum was examined. Impressions were made from a metallic model of a simplified maxillary dentition. Impressions and stone casts were measured respectively using the three-dimensional measuring microscope.
    The results were as follows:
    1. Distortion of impressions was so small that the reproducibility of impressions was superior three-dimensionally.
    2. These kinds of impressions and trays did not influence the accuracy of impressions but had an effect on the accuracy of the stone casts.
    3. Generally, the setting expansion of gypsum in the impression occurred in all directions.
    4. Arch widths and lengths on the stone casts tended to increase in number.
    5. Stone casts made from an addition/type siliconeimpression material and a custom tray were the most accurate because the combination of the impression material and tray effectively suppressed the setting expansion of gypsum.
    6. By controlling the quantity of gypsum, the accuracy of stone casts could be improved.
  • 篠原 直幸, 嶺崎 良人, 自見 忠
    1989 年 33 巻 4 号 p. 991-999
    発行日: 1989/08/01
    公開日: 2010/08/10
    ジャーナル フリー
    A mechanical simulation model of tooth and alveolar bone in the application of 3/4 crown and porcelain-fused crown restorations was made and analyzed using three-dimensional finite element technique.
    The results obtained were as follows.
    1. When the physiological tooth mobility was less than 150 pm, the teeth were sufficiently fixed using the splint and the bridge connected with more than two teeth, in the case of 20 percent absorption of the alveolar bone, and more than three teeth in the case of 40 percent absorption. In the case of 60 percent absorption, the teeth were fixed with the splint of six teeth connections, and were fixed with the bridge of five teeth connections.
    2. The periodontium supporting force decreased markedly according to the increase of the number of the abutment teeth.
    3. The teeth accompanied with the absorption of the alveolarbone were connected, in order to inhibit the tooth mobility and the periodontiumsupporting force. In this application, it had the inhibitory action when the replacing ratio of metal and ceramics to a crown of the tooth was less than 35 percent.
    4. According to the finite element analysis, the design bases of fixed restorations applied in the teeth accompanied with the absorption of the alveolar bone were preferred.
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