巻号一覧
37 巻 (1993)
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- 1 号 p. 1-
前身誌
37 巻, 2 号
選択された号の論文の22件中1～22を表示しています
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吉田 和也1993 年 37 巻 2 号 p. 227-235
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to elucidate the unloading reflex of masticatory muscles during pulverizing of food.
EMG, incisal movement and velocity and pulverizing sound were recorded in 8 normal subjects. EMG was recorded at the superior head (SLpt) and inferior head (ILpt) of the lateral pterygoid muscle, the anterior digastric muscle (Da), the temporal muscle (Tp) and the masseter muscle (Mm).
1. After discharging, silent period of the SLpt, Tp, and Mm and excitatory response of ILpt and Da were observed.
2. The rate of discharging reflex increased in accordance with the increase of incisal velocity.
3. The latency of discharging reflex was 23.0 msec for the ILpt, 20.6 msec for the Da.
4. The latency of the silent period was 7.7 msec for the SLpt, 8.6 msec for the Tp, 9.5 msec for the Mm. The duration of silent period was 39.2 msec, 37.6 msec, 38.2 msec respectively.抄録全体を表示PDF形式でダウンロード (1982K) -
第1報インプラント長さが周囲骨内応力に及ぼす影松下 恭之, 水田 有彦, 末次 恒夫1993 年 37 巻 2 号 p. 236-245
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate stress distribution in bone around bone bonded and bone-adapted Titanium cylindrical implants of various lengths using 2-dimentional finite element analysis. In a bone-adapted model the slip element was used at the interface between the bone and implant. The following results were obtained:
1. Stresses were observed at the neck of bone-bonded implants and the compact bone around the neck of bone-bonded implants, while stresses were observed at the cancellous bone around the bottom of bone-adapted implants.
2. In bone-bonded implants, the longer implant decreased the stress in the compact bone around the neck. Especially, when the bottom of the implant reached the opposite of the cortical bone, called bicortical fixation, the stress decreased most. On the other hand, in bone-adapted implants, the stress in the bone around the bottom of the implants changed according to the shape of the mandible. Bicortical fixation did not decreased the stress in the bone around the bottom of implants.抄録全体を表示PDF形式でダウンロード (2132K) -
小城 辰郎, 呂 毓修, 大西 俊之, 林 宏杰, 世良 優裕, 浅尾 武, 稲永 悟, 内田 康也1993 年 37 巻 2 号 p. 246-255
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーIn this study, porous hydroxyapatite particles (HAP) were implanted in the fresh extracted sockets in order to demonstrate whether an adequate pontic/tissue relationships for fixed partial denture could be achieved.
Right and left maxillary second incisors were extracted separately in 6 mongrel dogs. HAP were inserted in the right postextracted sockets. The other site was left to heal without HAP insertion and served as the control.
Three months later a three-unit fixed partial denture was placed individually on both sites. The 4th and the 6th months after operation, both sites were examined by macroscope, radiography and histopathology methods.
The results were as follows:
1. In all of the dogs after 3 months, ridge of the implanted site presented a rounded contour whereas the contralateral ridge atrophied into a knife-edge shape characteristically.
2. Healthy ridge and proper relationship of pontic/tissue were obtained in the implanted site after fixed partial denture was setted. On the other hand, plaque accumulation and marginal gingivitis increased gradually in the unimplanted site due to poor pontic/tissue relationship.
3. In the implanted site, new bone formation was observed around and between HAP, it increased still further and consisted with matured structure of lamellar bones.
4. In the unimplanted site, the newly formed bone became thinner and shorter gradually because of the reconstruction of bone tissue.抄録全体を表示PDF形式でダウンロード (3585K) -
第1報内冠の形態が維持力に及ぼす影響城戸 寛史, 守川 雅男, 竹屋 克昭, 千草 隆治, 豊田 静夫1993 年 37 巻 2 号 p. 256-260
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーIn using the conic telescope crown for anterior teeth, it is necessary for the inner crown to have a larger taper and chamfered margin on the labial surface in order to keep sufficient space for facing material. Although there are a lot of reports on the relationship between the retention of the outer crown and the taper of the inner crown, the effect of the chamfer depth on the retention has been unknown. In this study, the retention of the outer crown was examined in relation to the chamfer depth or knife-edge diameter of the inner crown.
The results were as follows:
1. The retention of the outer crown was significantly larger with the chamfer type inner crown than with the knife-edge type.
2. The retention increased with increase in the chamfer depth.抄録全体を表示PDF形式でダウンロード (838K) -
竹迫 清1993 年 37 巻 2 号 p. 261-272
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study is to measure the dynamics of the atmospheric pressure under the maxillary complete dentures in the edentulous patients and to elucidate the relationship between the atmospheric pressure and the stability of the denture.
The dynamics of atmospheric pressure, which induced during the prescribed functions of the mouth, were recorded as the waves.
The following results were obtained.
1. In the process of the seating of the denture, the atmospheric pressure under the denture (APD) became higher than the external one.
2. APD increased and decreased alternately during tapping movements.
3. APD decreased during the light opening movements and decreased more during the following wide opening movements.
4. APD became lower than the external one during the tapping or the opening movements.
5. APD decreased gradually as repeating increase and decrease every biting movement, during mastication of the test food (peanuts, carrots, kamaboko).
6. APD equaled to the external one when the denture was separated completely from the tissue.
7. The dynamics of atmospheric pressure under the maxillary complete denture seems to be influenced by oral conditions, denture designs and foods properties, and to be useful as an index of the denture stability.抄録全体を表示PDF形式でダウンロード (2393K) -
遁出孔の数とスペーサー量濱野 徹, 川畑 直嗣, 西 恭宏, 是枝 美行, 長岡 英一, 廣安 敬之, 迫田 敏文1993 年 37 巻 2 号 p. 273-283
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate the designs of the individual tray for the impression of the flabby tissue, using the improved simulation model with silicon rubber mucosa.
9 kinds of tray designs were prepared by the number of escape hole of 2.5mm in diameter (0, 26, 52 pieces) and the thickness of spacer (1.5, 3.0, 4.5mm).
The impressions were made with the polysurfide rubber, by the same impression method used for the universal test machine in the previous study, under 3 conditions of tray inclination which meant the settling directions of impression (anteriorly 20°, 0°, posteriorly 20°). The loads induced during impression making, which were explained by the stress at the load cell of testing machine, were recorded and used for explaining the pressure of impression.
The following results were obtained.
1. The designs and the settling directions of the tray influenced the deformation of the flabby tissue.
2. The deformation of the contour of flabby tissue could be reduced by increasing the number of escape hole and the thickness of spacer, but escape holes have more effect than spacers and settling directions.抄録全体を表示PDF形式でダウンロード (2271K) -
長谷川 嘉平1993 年 37 巻 2 号 p. 284-295
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe mandibular arch width changes between the right and left first molars, incisal movements and electromyograms of the inferior head of the lateral pterygoid muscle (LPt) was analyzed during opening and protrusive jaw movement.
The average maximum mandibular arch width decrease in five subjects was 397.7μm during opening and 585.0μm during protrusion. The width did not change much during the early stages of opening, although it decreased markedly in the later stages. During closing, the width rapidly returned to its original state. The decrease in width during static maintenance of a given opening position was smaller than the decrease at the same position during dynamic opening.
There was an immidiate decrease in the mandibular arch width at the beginning of protrusion, a gradual decrease as the protrusion proceeded, and an accelerating decrease in the later stages. The width during static maintenance of a given protrusive or retrusive position was essentially the same as that during dynamic movement.
There was a significant correlation between the decrease in mandibular arch width and the electromyographic activity of the LPt (p<0.001). The results suggest that the LPt is the primary cause of decreases in the mandibular arch width during opening and protrusion.抄録全体を表示PDF形式でダウンロード (2365K) -
馬場 俊輔1993 年 37 巻 2 号 p. 296-307
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーEnergy metabolic events on skeletal muscle fatigue have been reported using31P magnetic resonance spectroscopy (31P-MRS). In this study the degree of rat masticatory movements during feeding was determined by the signal intensity of a force transducer. The biting force of anesthetized rat caused by electrical stimulation was measured with a original biting force meter, and also the changes of levels of phosphocreatine (PCr), inorganic phosphate (Pi) and intracellular pH (pHi) in the masseter muscle during masticatory movements were observed using in vivo31P MRS.
The results obtained were as follows:
1. There was a linear relationship between the biting force and the signal intensity in a biting force range of 0 to 90g. The highest frequencies of occurrence in masticatory force and cycle during feeding were 40g and 5Hz respectively, and the maximum masticatory time was 32min.
2. 31P-MRS measurements were carried under the conditions of the electrical stimulation for 32min and the various masticatory forces-cycles. PCr/Pi ratios during the stimulation increased significantly under the conditions of 40g -7Hz, 90g -3, 5, 7Hzs, and pHi value during the stimulation changed significantly under the condition of 90g -7Hz. Both of them recovered after the stimulation.
These findings may suggest that the energy metabolism in the rat masseter muscle contraction is performed mainly under aerobic circumstance, and relate to masticatory force and cycle.抄録全体を表示PDF形式でダウンロード (2402K) -
鷹股 哲也, 黒岩 昭弘, 落合 公昭, 各務 篤彦, 湯本 光希子1993 年 37 巻 2 号 p. 308-317
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーSoft linings to dentures are sometimes considered advantageous for patients who are capable of delivering a relatively heavy occlusal load to unfavourable denture-bearing tissues. The color change of heat and room temperature vulcanized soft lining materials have been discussed. The purpose of this study is to compare the color changes of two visible light curing soft lining materials. Tests were made on samples that were stored in four aqueous solutions and one oleaginous solution for 1, 2, 3, 4, 8 and 12 weeks. The aqueous solutions included saline, turmeric, instant coffee and red color No.102. The oleaginous solutions consisted of olive oil plus β-Caro-tene.
The results were obtained as follows:
1. Color difference of both visible light curing soft lining materials were larger than conven-tional soft lining materials such as silicone, fluoride and polyorefin.
2. Two examined materials had almost the same color differences in both saline and red color No.102.
3. Extreme color differences were observed in instant coffee, especially in the “Lite Line”.
4. In the comparison of the “Lite Line”, which composed of a polyether urethane dimethacrylate resin material and the “Astron LC”, the former had a greater color difference than the latter in oleaginous solutions.抄録全体を表示PDF形式でダウンロード (1816K) -
第2報各種条件による上部構造の応力分布Part塩山 司, 青木 美佳子, 山森 徹雄, 笹嶋 泉, 細川 貢, 北村 靖, 島崎 伸子, 山野目 聡之, 石橋 寛二, 金子 則夫, 藤野 ...1993 年 37 巻 2 号 p. 318-326
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーStress distribution depending on the material and shape of the superstructure of bioactive glass implants were analyzed by the finite element method to observe its function and stability. Focus was placed upon the effect of applying various degrees of force to different types of materials used in the coronal and body portion of the superstructure, as well as changing the width of the superstructure and observing its stress distribution.
Results were as follows:
1. Stress value was higher in the metal core portion of the superstructure when compared to the gold alloy.
2. Stress value was highest among the gold alloy crowns.
3. Stress build-up was irrelevant to coronal width when force was applied at the center of the occlusal plane.
4. As force was applied continuously from the implant axis, stress build-up was observed in the shoulder or base portion of the superstructure.
5. Stress build-up was affected more by force placement and direction, rather than force strength.
In conclusion, applied force in the center of the occlusal plane should be at a 75°-105° angle. However if force is to be applied on the outer oblique planes of the buccal cusp, the force should be at a 105°-120° angle.抄録全体を表示PDF形式でダウンロード (2251K) -
II-2.上顎総義歯の中心咬合位について織井 康亙1993 年 37 巻 2 号 p. 327-336
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of the present study was to elucidate how the distribution of bearing stress and dynamics of basal seat under upper complete denture on during mastication give influence on the disorder of the under denture. First, evaluation was made on bearing stress of basal seat under upper complete denture at the centric occlusion on the alveolar bone.
The results were as follows:
1. Distribution of bearing stress Compared with the case of alveolar mucosa, the bearing stress on the alveolar bone was remarkably low.
The bearing stress on the alveolar ridge was higher in both alveolar mucosa and alveolar bone than on the other measuring points. In paticular, the bearing stress was highest on the incisive papilla. Next to the alveolar ridge, it was high on the border. On the buccal region and palate, the bearing stress was lower compared with the alveolar ridge and border. The postdam region was the lowest.
2. Dynamics of bearing stress
1) The time of occurrence of the bearing stress on the alveolar bone was shorter than on the alveolar niucosa. Particularly, this was more remarkable on maxillary tuberosity and palate.
2) Time of the bearing stress occurrence was approximately equal to the load reaching time, but it was remarkably shorter on maxillary tuberosity and a part of the palate.抄録全体を表示PDF形式でダウンロード (2503K) -
郡 元治, 坂東 永一1993 年 37 巻 2 号 p. 337-349
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe aim of this study was to develop a new compact six degrees of freedom jaw tracking device.
The results were as follows:
1. A new compact six degrees of freedom jaw tracking device using two magnetic fields in quadrature phase and sensor coils was developed.
2. The measurement accuracy of jaw movement and maxillary arch target point is about 700 μm.
3. This device is easier to handle than the digital type jaw movement analyzer (MM-JI), and able to obtain important information about jaw movement in six degrees of freedom.抄録全体を表示PDF形式でダウンロード (4324K) -
水野 幹生, 古谷野 潔, 末次 恒夫1993 年 37 巻 2 号 p. 350-361
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーMaximal mandibular opening and closing movement is performed by a combination of condylar rotation and anterior translation. The purpose of this study is to clarify the timing of these two factors of this movement. The timing of the movement obtained by means of Kyushu University 3-D movement analyzing system was studied in 30 normal subjects. We plotted the condylar rotation vs. the anterior translation with the sagittal condylar path to evaluate the timing, and named this locus “timing curve”.
The following results were obtained:
1. We classified the timing curves of all subjects into 3 patterns.
2. By comparing the timing curves of both sides of condyles in each subject, it was clarified that one side can not be independent of the other side, and it is necessary to estimate the timing in consideration of the one on the other side.
3. The antero-postero length and shape of the condylar path affects the patterns of the timing curve.
4. There is a close relationship between the pattern of the timing curve and the pattern of the sagittal incisal path.抄録全体を表示PDF形式でダウンロード (2814K) -
大井 啓司1993 年 37 巻 2 号 p. 362-375
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this research was to study temporomandibular joint sounds, especially TMJ clicking, by using a jaw function diagnostic system. This system is capable of recording jaw movements with six degrees of freedom, electromyography of masticatory muscles and TMJ sounds simultaneously. Ten subjects with unilateral clicking sounds were investigated. The results were as follows:
1. Two types of clicking were observed by the analysis of condylar translation pathways; the clicking that occurred at the constant position in all jaw movements, and the clicking at variable positions depending on jaw movements. The first type was prevalent.
2. The condyle shifted backward, outward and upward at the occurrence of the opening click and forward, inward and upward at the occurrence of the closing click. This phenomenon was detected in 4 of the 5 subjects with anterior disc displacement with total reduction.
3. The peak sound pressure level can be used as an index for evaluating the magnitude of TMJ sounds. The mean values were 86.4dB and 72.1dB respectively for opening and closing clicks.
4. There was a correlation between the condylar translation velocity of the clicking side and the magnitude of TMJ sound.抄録全体を表示PDF形式でダウンロード (3180K) -
市川 竜司, 野内 昭宏, 島田 久八郎, 草刈 玄1993 年 37 巻 2 号 p. 376-390
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーNeural control of endosseous implant-masseteric reflex was investigated in the decerebrated cats. Motor unit activities were recorded electromyographically. Pressure stimulation (1.5kg, 3s) was applied axially or laterally to implants made of titanium or bioactive glassceramics 12 weeks after operation.
Reflex effects varied from excitation to inhibition with the level of ongoing activity (background activity: BGA). Excitatory effect was induced at low BGA, and inhibition occured in the high range. The reflex effect was weaker than that from natural teeth at any BGA. The inhibitory reflex was more easily elicited compared with periodontal jaw reflexes. Applying stimulation laterally in 4 directions to the implants, the directional selectivity of response was observed. This characteristics was relatd with the region of implantation in dental arch. Stimulating the implants, sustained discharges of mechanosensitive units were recorded from the inferior alveolar nerve.
These findings indicate that neural control elicited from endosseous implants analogize with periodotal jaw reflexes.抄録全体を表示PDF形式でダウンロード (3104K) -
玉澤 佳純, 木村 幸平1993 年 37 巻 2 号 p. 391-400
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーIn many reports and publications, the axis of the tooth crown is used as the standard axis for tooth preparation of vital teeth. However, in 1968, Oohashi reported reduction of survival tooth substance in the mesial horn of the pulp chamber when the axis of the tooth crown was chosen as the axis of tooth preparation for treatment of the upper central incisor. Furhermore, in such cases, unexpected pulp exposure and extended tooth reduction are frequently observed clinically. Considering the position of the coronal portion of the preparation relative to the pulp cavity, we examined whether the axis of the tooth crown is the most appropriate choice as the standard axis of the tooth preparation.
The following results were obtained with extracted upper central incisors as specimens.
1. More survival tooth substance was found on the distal side of the axial surface than on the mesial side when tooth preparation was done according to the axis of the tooth crown.
2. The distance from the incisal surface to the distal horn of the pulp chamber was longer than that to the mesial horn of the pulp chamber.
3. In order to maintain an even thickness of the distal and mesial survival tooth substance, it was found that the standard axis should be tilted to the mesial side at about 2.9 degrees relative to the axis of the tooth crown.抄録全体を表示PDF形式でダウンロード (1867K) -
第3報インプラントおよび周囲歯槽骨の応力分布笹嶋 泉, 塩山 司, 北村 靖, 青木 美佳子, 山森 徹雄, 細川 貢, 石橋 寛二, 金子 則夫, 藤野 雅美, 長谷川 達郎1993 年 37 巻 2 号 p. 401-406
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーBioactive glass has a unique trait for binding to bone. Therefore, in order to maintain the bondage for a longer period of time, it is necessary to investigate the stress distribution within the artificial tooth root and surrounding bone tissue. This research deals with analyzing these stress regions using the finite element method.
The results were as follows:
1. Large amounts of stress were found to be concentrated on the metal core layer of the artificial tooth root. Compared to the metal core layer, the glass layer showed less stress.
2. In the surrounding bone tissue, stress appeared to be concentrated along the alveolar ridge and restraining point.
3. The effect of the material of the superstructure upon the stress within the artificial tooth root and surrounding bone tissue appeared to be minimal.
4. When the width of the mandibular bone was narrow buccolingually, the original stress point tended to move toward an apical direction and increase at the same time.
5. When application of force upon the artificial root was not in direction of the tooth axis, the stress factor tended to increase.抄録全体を表示PDF形式でダウンロード (1636K) -
鎗田 敏之, 草刈 玄1993 年 37 巻 2 号 p. 407-419
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study is to evaluate the effect of low power laser on human gingivalmicrocirculation. In normal periodontal tissue, experimental gingivitis was caused in the upperanterior jaw of the 17 subjects by interrupting tooth brushing. After 0, 2 and 4 days and 1, 2 and 3 weeks of plaque accumulation, the gingiva was irradiated by Ga-Al-As laser (60mW). Beforelaser irradiation, immediately and respectively 30 minutes after laser irradiation, the gingival bloodflow and the gingival crevicular fluid was measured. At the same time, the shape of the bloodvessels beneath the oral sulcular epithelium was also estimated.
The results were as follows:1. In the first stage of gingivitis, blood flow was increased by laser irradiation.
2. By laser irradiation, no morphological change was observed in the blood vessels in anystage of gingivitis.
3. By laser irradiation, there was no significant quantitative change in the gingival crevicularfluid in any stage of gingivitis, however it decreased as a whole.
These results suggest that low power laser may improve the gingival circulation in the firststage of gingivitis.抄録全体を表示PDF形式でダウンロード (3546K) -
大久保 力廣, 鈴木 恭典, 中山 昇, 森田 潤一, 栗原 大介, 花谷 重守, 阿部 實, 宮田 孝義, 尾花 甚一1993 年 37 巻 2 号 p. 420-430
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe structural design of the metal alloy framework for removable partial dentures is critical. A double structure framework was the representative of these designs, which enables the mechanical strength and durability to improve and the abutment teeth and alveolar ridge to protect. In this study, several structural designs (double structure, T-shapes, trussed structure, rectangular column, nonuniform section) including resin block as control were subjected to a load-controlled fatigue test. The benefits on fatigue strength of five types of structures were evaluated to record the number of cycles at catastrophic failure, to measure continuously displacement and strain under loads repeatedly, and to observe the fracture patterns.
The results were as follows:
1. Maximum stiffness of double structure and T-shapes was approximately 20 times that of rectangular column and nonuniform section by theoretical calculations.
2. Fatigue strength of double structure was the highest, followed by that of trussed structure and T-shapes.
3. Double structure was found to be the significantly lowest of both displacement and strain.
4. Packed resin fracture was observed in all specimens except double structure.
5. The interface of fractured specimen frameworks were revealed inherently with fatigue.抄録全体を表示PDF形式でダウンロード (3581K) -
正常歯, 変色歯および変色歯形成後の色調の比較高 永和, 中村 隆志, 丸山 剛郎1993 年 37 巻 2 号 p. 431-435
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーThe aim of this study was to investigate the characteristics of discolored teeth after laminate veneer preparation. Normal teeth, pre-and post-preparation of discolored teeth were used for the study. Measurements were performed in the mouth using a small area colorimeter to evaluated the color with the CIE L*a*b*color system.
The following were obtained.
1. Postpreparation of discolored teeth was more reddish and yellowish than that of prepreparation, however, no significant difference of lightness was observed between pre-and post-preparation.
2. Postpreparation of discolored teeth was darker, more reddish and yellowish than that of normal teeth.抄録全体を表示PDF形式でダウンロード (1146K) -
榎本 友彦1993 年 37 巻 2 号 p. 436-445
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーIn the present study, with the view of elucidating the influence of gum chewing on the body sway, 14 subjects without subjective and objective abnormal equilibrium and stomatognatic functions (12 males and 2 females aged 23-28 years, averaging 24.2) were measured for the area, distance and standard deviation-area in mandibular rest position (NR), gum chewing (NC) and occlusal interference-given gum chewing (IC) according to the measurement criteria recommended by the Japan Society for Equilibrium Research.
The following results were obtained:
1. Compared with NR, all subjects in NC showed smaller values of each of the analytical items of area, distance and standard deviation-area. For the subject population, the difference was highly significant for each of the analytical items.
2. NR and IC values showed their respective different relationships among subjects and analytical items. For the subject population, the difference between these two conditions was significant for each of the analytical items.
3. Compared with IC, all subjects in NC showed smaller values of the analytical items of area and distance, and 11, 1 and 2 subjects showed smaller, equal and larger values, respectively of the item of standard deviation-area. However, the difference for the latter 2 subjects was not statistically significant. For the subject population, the difference between these two conditions was significant for each of the analytical items and to a great extent especially for the area and distance.
4. The above results suggest that gum chewing has an inhibitory effect on the body sway.抄録全体を表示PDF形式でダウンロード (2175K) -
土田 富士夫1993 年 37 巻 2 号 p. 446-458
発行日: 1993/04/01
公開日: 2010/08/10
ジャーナル フリーA method was devised to calculate mandibular alveolar bone height in edentulous patients from panoramic radiographs.
Panoramic radiography is generally unsuitable for determing alveolar bone loss because of distortion and indeterminate magnification of the radiographs.
The method utilizing five metal tubes were placed on the alveolar crest at the incisor, premolar and molar regions of three dried human mandibles. The known dimensions and the position of the tubes enabled correction for distortion and magnification to be made as well as the height of the mandibular alveolar to be calculated.
The metal tubes were attached to the alveolar bone perpendicular to the mandibular plane in a position which fell within the image plane of the radiograph.
The mandibular height was measured along perpendicular lines drawn through the central axis of the tubes.
From the known height of the dried mandible a factor was calculated for application to the measurement from the panoramic radiographs. The errors were almost found to be less than 3-4% of the actual mandibular height.
From these results it was found to be possible to calculate mandibular alveolar bone values clinically by placing the standard metal tubes on the alveolar crest of patients before exposing the panoramic radiograph.抄録全体を表示PDF形式でダウンロード (4589K)
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