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[in Japanese]
1999 Volume 43 Issue 1 Pages
1
Published: February 10, 1999
Released on J-STAGE: August 10, 2010
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Hajime Fuchihata
1999 Volume 43 Issue 1 Pages
2-5
Published: February 10, 1999
Released on J-STAGE: August 10, 2010
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Diagnostic imaging in dentistry has been performed mainly by intraoral and panoramic radiography. Computed tomography and magnetic resonance imaging were put in practical use in 1972 and 1980, respectively. Now it is possible to observe distinct horizontal section images of the human body which could hardly be obtained before. These advanced imagings have been utilized also in oral and maxillofacial region for diagnoses of TMJ disorders, tumors and so forth. Furthermore, through utilization of ultrasonography, scintigraphy and 3-D reconstructed images, these current diagnostic imagings have become much more important tools for diagnosis in the oral and maxillofacial region.
Advanced diagnostic imagings mainly of TMJ disorders and dental implant were considered from the view point of prosthodontic treatment.
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Noboru Ohata
1999 Volume 43 Issue 1 Pages
6-12
Published: February 10, 1999
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The purpose of this study was to investigate the problem of prosthetic diagnosis using periapical dental radiographs for crown and bridge. In general, periapical dental radiographs were on the following.
1. The form of pulp cavity.
2. The length ratio of crown to root.
3. The form of root trunk.
4. The resorption of root and bone.
5. The dental caries and the root fracture.
6. The structure of periodontal tissue (the space of periodontal membrane, the alveolar border, the lamina dura and the spongy substance of alveolar bone).
The radiographic findings are useful for periodontic and endodontic diagnosis. More useful and functional information must be obtained for prosthetic diagnosis. Thus, the suggested plans are as follows:
1. The crown and bridge made by prosthodontist with a 5-year guarantee.
2. The oral radiologist should administer and manage all periapical dental radiographs.
3. To investigate viewing radiographs from a functional perspective.
4. Practice of prosthetic treatment with team-approach.
Two cases were reported. One was a destruction case of periodontal tissue by ITI implant. The other was a reconstruction case of periodontal tissue by the transplantation of mandibular molar following iliac cancellous bone graft.
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Toshio Hosoi
1999 Volume 43 Issue 1 Pages
13-19
Published: February 10, 1999
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Rotational panoramic radiograph is widely used in screening as well as primary examination of various diseases in the stomatognathic area. In this report, how diagnostic imaging by rotational panoramic radiograph is performed to fit edentulous patients with prosthesis, focusing upon the mandible, which is often difficult to deal with, is presented, The density compensation system for the temporomandibular joint is used to examine the dental arches and temporomandibular joint simultaneously, which makes it possible to dentermine the morphology as well as the position of the condyles. By adding four fractional radiography of the mandibular condyle using a panoramic machine, movement of the condyles on both sides can also be examined to some extent. Furthermore, the recently developed multimodality panoramic radiography can create transverse section images of the mandible, providing useful information for examination and diagnosis of implant patients, for example, to determine the selection, the location, and direction of implants.
The following items were discussed:
1. The height of the mandible (the degree of bone resorption)
2. The form of the condyle
3. The position of the condyle
4. Cross sections of the mandible
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Tetsuo Ichikawa
1999 Volume 43 Issue 1 Pages
20-26
Published: February 10, 1999
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This article describes image examinations concerned with implant treatment and soft tissue for restoring partially and completely edentulous patients.
Image examination is necessary for implant treatment, preoperative evaluation of bone quality and shape, assessment of osseointegration and fitness between implant and abutment, postoperative assessment of bone remodeling, and marginal bone loss. Contrast X-ray media, pilot hole preparation, standard radiography, and digital image processing were used to evaluate the procedures. Especially, evaluation of bone quality was discussed.
It is very important to evaluate soft tissue, for example, tongue, cheek, lips, and so on for restoring partially and completely edentulous patients. The evaluation is often forgotten during prosthetic treatment. Cephalography, ultrasonic measurement, and MRI were proposed for the evaluation, and the problems and overlook for the evaluation were discussed.
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Hirofumi Yatani
1999 Volume 43 Issue 1 Pages
27-36
Published: February 10, 1999
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Dentists must assess the oral function of patients prior to prosthodontic treatment since dental treatment is completed prosthodontically in many cases. Mastication, the most important oral function, is closely associated with temporomandibular joint function. Therefore, examination and diagnosis of temporomandibular joint are the key to success for prosthodontic treatment. The purpose of this study was to review and discuss the selection criteria of imaging modalities of temporomandibular joint and how imaging diagnosis should be meaningfully used in clinical practice. Plain-film radiography, panoramic radiography, conventional tomography, computed tomography, arthrography, and magnetic resonance imaging are imaging techniques available for assessment of the temporomandibular joint. Although accuracy studies of these techniques have demonstrated that magnetic resonance imaging has the highest accuracy, the selection of techniques should be done based on what part of and how accurate images are needed for prosthodontic treatment planning.
Temporomandibular joint imaging is useful for differentiating temporomandibular disorders from other joint disorders such as synovial osteochondromatosis and rheumatoid arthritis. In addition, imaging gives prosthodontists important information for determining anterior guidance in cases whose upper anterior teeth should be totally reconstructed. The condylar position on imaging was also discussed in connection with the changing concept of the central relation. It was concluded from the discussion that the clinical significance of determining condylar position is not high at present.
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Hiroki Mori
1999 Volume 43 Issue 1 Pages
37-47
Published: February 10, 1999
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With the increase in the elderly population, the number of elderly patients seeking dental treatment is increasing. Therefore, it has become increasingly important to evaluate the relation between oral and general conditions of elderly patients.
A comparative study on the relationship between denture user and A.D.L., the change in A.D.L. before and after using of complete dentures, and the change in the laboratory evidence before and after using of complete dentures was conducted. For the subjects of the investigation, 247 inpatients over 65 years old who received dental treatment at geriatrics hospitals in Yachiyo City, Chiba Prefecture were used.
The results were as follows:
1. A high numerical value was indicated for A.D.L. of the group wearing dentures.
2. Wearing dentures could have some effect on the activity of the subjects.
3. Wearing dentures could have some effect on the eating habits of the subjects.
4. Wearing complete dentures colud have some effect on A.D.L. of the subjects.
5. The numerical value of the laboratory tests became good in accordance with the stability of the complete dentures.
These results suggested that the prosthodontic treatment could have some effect on A.D.L. for elderly patients.
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Part 2. In vivo Measurements of Removable Bridge with or without Saddle
Shunsuke Kitamura, Akira Ogata, Yoshimasa Igarashi, Akira Suzuki, Jun ...
1999 Volume 43 Issue 1 Pages
48-53
Published: February 10, 1999
Released on J-STAGE: August 10, 2010
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Purpose. In prosthdontic treatment, application of fixed bridge to the expanded intermediate tooth loss often causes overloading of the abutment teeth.
Removable bridge with saddle was considered to reduce this danger of over loading.
However, little is known about the degree of the reduction by the tissue support of the saddle.
The purpose of this study was to evaluate the reduction of occlusal force concentration to the abutments by applying the tooth-bound saddle.
Methods. The subject was the same as in the first report.
Measurement was carried out on the canine and second molar.
Each retainer was constructed with a telescopic crown.
Two types of removable bridge were assessed with or without tooth-bound saddles.
Test occlusal force of 60 N was applied to the center of bridges.
Occlusal force distribution to the abutments and to the bound saddle was measured simultaneously.
Conclusion. Support by the bound saddle on an alveolar crest was observed by giving saddle, and the decrease of occlusal force distribution to the abutment teeth was observed.
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3 D Motion Capture in Adults with Normal Dentition
Tetsuya Yamagata, Kensuke Yamagata, Yuhji Kohno
1999 Volume 43 Issue 1 Pages
54-66
Published: February 10, 1999
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Orofacial movement trajectories during speech were monitored in 10 dentulous young adults pronouncing the test sentence:[sakura-no-hana-ga-saki-ma∫ita].
Methods: Retro-reflective markers, which were recorded as reflective points with clear outlines when illuminated with infrared strobe lights, were used to provide trajectory data at the following reference points: the modiolus (Mo), menton (Me), vermilion border of lower lip (LL); and incisal point (IP). The facial markers of each subject were located and automatically tracked during pronunciation with the use of six video cameras to provide six different perspectives, and the video data were collected with a data station (Vicon 370, Oxford Metrics). Each time frame during which each consonant was pronounced was identified on the basis of its waveform and sound spectrogram. The movement of each facial target during each time frame was tracked automatically by a work station (Vicon 370), and the three-dimensional (3-D) coordinated data were transferred to a computer. The results of photogrammetric measurement during pronunciation of each tested consonant were analyzed with a 3-D analyzer (Movias 3 D, nac).
Results: Specific trajectories were apparent during pronunciation of [s], [m], and [∫] among other consonants and vowels in the test sentence. The results revealed that mandibular movements (IP) were greater than orofacial movements (Me, LL) during pronunciation of [s]. In contrast, orofacial movements (Me, LL) were greater than mandibular movements (IP) during pronunciation of [m].
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Application of Ultrasonic Cleaning for Improving Infiltration of Neutralizer
Hisanori Kurashige, Hiroyuki Minami, Mari Komuta, Hirofumi Ohashi, Tak ...
1999 Volume 43 Issue 1 Pages
67-72
Published: February 10, 1999
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Bacterial infection to the dentin surface of the prepared teeth is considered to be one of the important factors that cause pulpal inflammation or secondary caries. NaOCl solution is used as a disinfectant, but the application of the NaOCl solution to dentin surface is known to markedly decrease the adhesive strength of 4-META/MMA-TBBO resin cement to dentin.
The purpose of this study was to find a way to recover the adhesive strength of 4-META/MMA-TBBO resin cement to dentin after reduction by sterilization with the NaOCl solution.
After sterilization with the NaOCl solution, three solutions, 3% hydrogen peroxide, 5% sodiumthiosulfate, and 5% ascorbic acid, were used to neutralize the remaining Na0Cl, but the recovery of adhesive strength was 20-50% in comparison with only etching treatment.
In case of the neutralization with both the solutions and ultrasonic cleaning, the adhesive strength recovered approximate to that of only etching treatment.
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Shuu Fujiwara, Shigenori Saito, Kunio Nakajima, Atsushi Minami, Teruhi ...
1999 Volume 43 Issue 1 Pages
73-79
Published: February 10, 1999
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The purpose of this study was to evaluate the efficacy of disinfection method using a flow water system with electrolytic products of sodium chloride (BK) on alginate impressions and subsequent atone casts contaminated with Candida albicans and blood. The dimensional changes and surface roughness of alginate impression on BK water were evaluated.
Each alginate impression from a model of maxillary dental arch was inoculated with each
Candida albicanscell suspension at a density of 1.5 × 10
7 cell/ml and sheep blood. The impression was disinfected with BK flow water and residual microorganisms were harvested, cultured, and counted. The washing disinfection with BK flow water removed most
Candida albicans. Thus, after the washing disinfection of impressions with the flow BK water, the subsequent stone casts were disinfected again with flow water and then residual microorganisms were counted. The washing disinfection of alginate impression for 30 seconds and subsequent stone casts for 15 seconds with flow BK water removed all
Candida albicansinoculated. This infectant technique using flow BK water is effective and simple.
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Ikumi Shiozawa, Takahiro Sato, Yoshihiro Daidohji, Norihiko Funayama, ...
1999 Volume 43 Issue 1 Pages
80-89
Published: February 10, 1999
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The indirect method of full cast crown construction has been constantly improved by the introduction of new dental materials and impression techniques. However, the ideal materials and a technique for making crowns with a complete marginal fit have not been developed yet.
The purpose of this study was to clarify the influence of the indirect method on marginal fit of crown by altering various factors.
1. Conventional or fast-setting gypsum-bonded investments.
2. Three different types of impression materials: addition silicone with individual tray, double-mixed addition silicone and agar with irreversible hydrocolloid.
3. Water-saturated or dry ring lining material.
A microscope was used to measure the fit of castings. The fit of castings was defined as the casting margin difference from the original position when they were tried on a steel die.
The fit of castings made in the method using fast-setting gypsum-bonded investment was looser and the marginal difference was significantly smaller than that using conventional gypsum-bonded investment irrespective of the impression material and usage of ring lining materials.
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Hirotada Kajihara
1999 Volume 43 Issue 1 Pages
90-99
Published: February 10, 1999
Released on J-STAGE: August 10, 2010
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The thermocycling test is one of the most important methods for evaluating adhesion durability of metal-bonded resin system. However, researchers have adopted various kinds of thermocyclings pecimens which greatly differ from one another in size, shape, restriction method for adhesive area, etc. These differences in specimens make the comparison of test results difficult and the uniformity of adhesion specimens is to be desired.
In this study, adhesion specimens applied the three metal bonding systems were constructed, and the influence of the difference in configuration and material of the specimens were studied based on the results of thermocycling test up to 50, 000 times.
The results were as follows:
1. The shear bond strength of 5-mm diameter specimens showed higher value than that of 3-mm diameter when the bonding area was restricted by the shape of the handle end.
2. The specimen with adhesive area restricted by masking tape showed higher bond strength compared with the specimen whose bonding area was restricted by the shape of the handle end.
3. The highest bond strength was obtained in the specimen with a handle made of the same material as the adhered disk.
4. Thermocycling stress influenced most severely the specimen with a brass ring handle.
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Part 1. Identification ofHelicobacter pyloriin Denture Plaque
Yoko Terada, Katsuhiko Hirota, Kan Nagao, Toshiya Kashiwabara, Tetsuo ...
1999 Volume 43 Issue 1 Pages
100-104
Published: February 10, 1999
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There is increased awareness that infection with
Helicobacter pylori(H.
pylon) could be a causative agent of gastric diseases. The sources of H.
pyloninfection and the transmission routes are still unconfirmed. The purpose of this study was to investigate the presence of H.
pylonin denture plaque. Denture plaque was obtained from the fitting surfaces of dentures from 31 elderly inpatients. H.
pylonwas detected by using polymerase chain reaction (PCR). A polymerase chain reaction (PCR) was designed to amplify the H.
pylongenes encoding 16SrRNA and Urease A. Two patients were PCR positive for H.
pylonin denture plaque.
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Madoka Morii, Masako Furuya, Tadashi Nagashima, Takahiro Ono, Takashi ...
1999 Volume 43 Issue 1 Pages
105-110
Published: February 10, 1999
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The purpose of this study was to examine the causes of taste disorders of denture wearers. Ten subjects who had intact dentition and no taste disorders were investigated. Four kinds of experimental palatal plates were made after taking the subjects' impressions. They were “A plate”-covering anterior palatal region, “M plate”-covering middle region, “P plate”-covering posterior region, and “Basic plate”-covering the whole hard palate.
First, the chewing method was used to examine the gustatory responses of bitter and salty stimuli according to the threshold of judgment. Then, chewing movements were measured and analyzed by Mandibular Kinesiograph through chewing a testing gumi-jelly and peanuts, both with and without the experimental palatal plates, respectively. As a result, the threshold of judgment of the gustatory response and the chewing time increased more in the “P plate” and the “Basic plate” than those in the “A plate” and the “M plate”.
The results suggested that the experimental plates covering the whole and posterior regions of the hard palate have more influence on taste than those covering the anterior and middle regions.
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Noriyuki Narita, Hiroshi Endo
1999 Volume 43 Issue 1 Pages
111-121
Published: February 10, 1999
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Brain activities related to jaw movement were investigated to clarify the cortical control mechanisms from the standpoint of relationships between the type of mandibular movement and the appearance of magnetic fields in the primary sensorimotor cortex using magnetoencephalography (MEG) measurements. Three adult volunteers were asked to conduct movements such as jaw opening, lateral jaw, and finger abductive movements. Motor fields (MF) accompanying jaw opening appeared at bilateral primary sensorimotor cortices, while MF related to lateral jaw and unilateral forefinger abductive movements dominantly appeared in the hemisphere contralateral to the movement side. Further, movement evoked fields (MEF) accompanying jaw opening and lateral jaw movement appeared at bilateral primary sensorimotor cortices, while MEF accompanying unilateral forefinger abductive movement appeared in the hemisphere contralateral to the movement side. Forward dipole of MF was estimated at the primary motor cortex, while backward dipole of MEF was estimated at the primary somatosensory cortex in every session. From these findings, it was assumed that the dominance of activity at the primary motor cortex depends on the direction of mandibular movement, and the proprioceptive feedback afferentation accompanying jaw movements to the primary somatosensory cortex would arise from bilateral orofacial regions.
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Part 1. Influence of Physical and Chemical Surface Treatments on Coating Deposits
Shoji Hayashi, Tomoji Sawada, Naoki Yamada, Koichi Kurokawa, Tadashi S ...
1999 Volume 43 Issue 1 Pages
122-130
Published: February 10, 1999
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As apparatuses used in prosthesis have recently been increasing in size and complexity, it has often become difficult to fabricate prostheses by one piece casting. Particularly, considering the complicated environment of the mouth in mastication and the need for the protection of the abutment teeth, fitness accuracy is an important factor and the used of fusion welding and brazing has become indispensable for successful fitness of the prosthesis. However, existing bonding techniques are subject to certain limitations and it was necessary to research techniques for improving accuracy.
To deal with this problem, a coating deposit based on electrodeposition, which dose not spoil the characteristics of deposits metal and which can bond prosthesis apparatuses to similar materials without relying on indirect methods such as soldering or cast bonding was developed. In developing this technique, a deposit metal was treated physically and chemically, electro-deposition was made on the treated surfaces, and a tensile shear strength test was performed. Then the processes used in the treatment of the surfaces were analyzed by ESCA analysis and SEM observation. The results were as follows:
1. This technique enables the coating deposition of deposits metal.
2. Physical treatment consisting of sandblasting is the most effective method for improving the bonding strength.
3. Chemical treatment consisting of hydrochloric or sulfuric acid treatment can both activate the deposits metal surface and improve the bonding strength.
4. The deposit metal surface activation capability of hydrochloric acid is higher than that of sulfuric acid.
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Effects of Investment Fixation and Heat Treatment
Akitoshi Himi, Kazutoshi Kakimoto, Seiji Kawahata, Yutaka Komasa, Yosh ...
1999 Volume 43 Issue 1 Pages
131-137
Published: February 10, 1999
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Recently, the laser welding has gradually been applied as a joining method for dental alloys. Therefore, this study was conducted to develop a welding method for preventing laser welding deformation. In this study, the influence of the fixed strength on the prevention of welding deformation was examined by fixing Ag-Pd-Cu-Au alloy specimen with a soldering investment or silicone rubber. Moreover, the effectiveness of post-heat treatment after welding on the welding deformation prevention was examined. In addition, the deformation result of the laser welding was compared with that of soldering.
The conclusions were as follows:
1. It was effective to compensate for transverse shrinkage to expand joint gap considering the degree of the shrinkage by setting expansion of soldering investment on fixing specimens there with.
2. The strong fixation of specimens with soldering investment could reduce welding deformation.
3. Post-heat treatment of the specimen fixed by investment was effective in preventing the deformation.
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Yasuhito Suzuki, Tomoo Okada, Akiyoshi Shinya, Shigeo Yokozuka
1999 Volume 43 Issue 1 Pages
138-148
Published: February 10, 1999
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This study, for clinical application of dentistry, was conducted to investigate five physical properties of four porcelain candidates: Vickers hardness, fracture toughness, color stability, crack level, and firing shrinkage of the porcelain fused to titanium. The four candidates-Noritake-TITAN, Vident-Vita Titanium, Degussa-Duceratin, and Ohara-Titanbond-were investigated under the condition of loading 5 kgf to them for 15 seconds. The results were as follows:
1. Vickers hardness: 707 through 847 HV
2. Fracture toughness: 1.26 through 1.84 MNm
3/2 (The maximum with Ohara-Titanbond)
3. Color stability: a. Opaque's: L*=83.27 to 87.69, a*=1.40 to 2.45, b*=9.97 to 15.55; b. Dentin's: L*=67.60 to 73.77, a*=0.41 to 0.88, b*=6.00 to 9.26
4. Crack type: Median crack
5. Firing shrinkage: a. Opaque's: 10%; b. Dentin's: 15%
As shown in the data, the results were significant and almost equal to that of the conventional methods, which means that the usage of the porcelain fused to titanium is just as good. Two remarkable points were found: opaque to dentin in the color stability of Y range is higher; opaque to dentin in the firing shrinkage is lower. It was concluded that improving the two points could make it the best dental application.
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Eiichi Bando, Toyoko Satsuma, Shuji Shigemoto
1999 Volume 43 Issue 1 Pages
149-159
Published: February 10, 1999
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The pursuit of ideal occlusal contact is one of the fundamental objectives of the dental prosthesis. To attain this objective, the study on micro tooth movement is significant as well as the study on jaw movement. The purpose of this study was to evaluate a newly-developed extraordinary accurate motion detector that measures tooth movement in six-degree-of-freedom. The principle of the measurement is to detect magnetic field changes induced by Helmholtz coils. A right maxillary first premolar of an adult male volunteer was selected for the measurement. The tooth movement during buccal and palatal cusps loading was measured as the relative position changes to the opposite side maxillary first premolar. The results were as follows:
1. An extraordinary accurate motion detector that can evaluate tooth movement in six-degree-offreedom was developed. The resolution of the measuring system is 4 μm for translation and 0.0004°for rotation.
2. Under 23 kgf buccal cusp loading, the tooth was moved in the buccomedioapical direction. This movement ranged from 143 to 366 μm. Under palatal cusp loading, the tooth was moved in the palatoapical direction, ranging from 71 to 231 μm.
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Masaki Shirai, Akiyoshi Shinya, Shigeo Yokozuka
1999 Volume 43 Issue 1 Pages
160-170
Published: February 10, 1999
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The titanium crown is rapidly replacing other metallic crowns today. However, it has a crucial problem; the crown worked in a conventional way is less adaptable. To solve that problem, a new technique employing CAD/CAM with a laser measuring system has been developed to produce an accurate and desirable inner surface of the titanium crown. Then a coordinate measuring machine was set to measure and contrast two of the candidates:
1. The inner surface of the titanium crown worked in the conventional way:
Laser beams were applied to the titanium crown at 90°to the long axis of the tooth and the inner surface was finished with the ball-end-mill of a 2.0-mm diameter.
2. The inner surface of the titanium crown worked in the new technique:
The model abutment was set at a 10°angle to apply the laser beams effectively to the cervical part of the titanium crown for measuring the accuracy. The same ball-end-mill was used to rough-finish it, and then the 1.0-mm diameter one was used to elaborate it.
The result showed remarkable contrasts to reveal the superiority of the new technique: the conventional way produced a significant tolerance from the occlusal area to the cervical; the new technique produced a fine marginal form and a high adaptability in the working accuracy.
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Susumu Akagawa
1999 Volume 43 Issue 1 Pages
171-172
Published: February 10, 1999
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Hideaki Watanabe
1999 Volume 43 Issue 1 Pages
173-174
Published: February 10, 1999
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A 7 Years Postoperative Case
Yasuo Miyauchi
1999 Volume 43 Issue 1 Pages
175-176
Published: February 10, 1999
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A 6 Years Postoperative Case
Kazuhiro Watanabe
1999 Volume 43 Issue 1 Pages
177-178
Published: February 10, 1999
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Koh-ichi Kuremoto
1999 Volume 43 Issue 1 Pages
179-180
Published: February 10, 1999
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