Annals of Japan Prosthodontic Society
Online ISSN : 1883-6860
Print ISSN : 1883-4426
ISSN-L : 1883-4426
Volume 5, Issue 1
The 121st Scientific Meeting of Japan Prosthodontic Society
Displaying 1-20 of 20 articles from this issue
Invited Articles
The 121st Meeting of Japan Prosthodontic Society - Symposium 3 -
The 121st Meeting of Japan Prosthodontic Society - Clinical Relay Session 2 -
Original Articles
  • Yoshinori Chiba, Shuichiro Yamashita, Kozaburo Hashii, Yusuke Nakatsuk ...
    2013 Volume 5 Issue 1 Pages 37-46
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Purpose: Playing instruments has been implicated in temporomandibular disorder (TMD) in youth. To date, however, there has been little research into clarifying the causal relationship between starting to play an instrument and the occurrence of symptoms. This study aims to clarify the conditions surrounding the occurrence of TMD symptoms in youth with experience playing an instrument, and to investigate the causal relationship between such experiences and the onset of TMD symptoms based on comparisons with adults.
    Methods: The subjects were junior high school students in Nagano Prefecture, Japan, who responded to a questionnaire as part of an epidemiological survey. A similar questionnaire was also administered to adult for the sake of comparison. Points of analysis were the relationship between thetimeof onset of TMD symptom and the time of starting to play an instrument, the rate of occurrence of TMD symptoms, factors contributing to the onset of TMD symptoms, and the relationship between personality and onset of TMD symptoms.
    Results: In both youth and adult, the rate of occurrence of TMD symptoms was higher in those with experience playing an instrument than in those without such experience. The time of onset tended to be either the same as the time for starting to play or later. In youth subjects with experience playing an instrument, daytime jaw clenching was associated with an onset of TMD symptoms, and those who experienced TMD symptoms tended to have a more neurotic personality than those who did not.
    Conclusion: Some association was found between the time of starting to play an instrument and the time of the onset of TMD symptoms. However, this trend was seen in both youth and adult. These results suggest that internal factors play a large role in adolescents with experience playing an instrument.
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  • Yorio Hayashi, Hiroshi Kobayashi
    2013 Volume 5 Issue 1 Pages 47-55
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Purpose: The aim of this study is to know the transmission of vibration of the dental motor in technical procedures and to protect dental technicians from vibration disease in hand and arm areas.
    Methods: Sixteen candidates, dental technicians (male: 12; female: 4; 57.1 years old on average) who have no disease on their hand and arm areas, were involved this study. Two small 2-axis accelerometers are put on a motor and a finger. Vibration was measured when the subjects were carving dental stones and plastics at two places: the center of the handpiece motor and a finger. As a control, the vibration made by hand-writing was measured. The speed of the motor was set at 40,000 rpm and the point to carve was a carbide burr.
    Results: In carving stones (0.089 G), greater acceleration was observed than inplastics (0.087 G) or in hand writing (0.068 G). No statistical differences were found between them. About absorption of the vibration, the stone showed greater value.
    Conclusion: Because the absorption of the vibration was small in the low-frequency area (<8 Hz). it was concluded that vibration was well transmitted from the handpiece to the finger. The impact of the carving work was estimated to be around 23 times greater than the writing work, calculating by mass ratio.
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  • —Comparison of the Immediate Surgical Obturator and the Definitive Obturator—
    Hana Nagai, Mai Murase, Yuka I, Hisashi Taniguchi
    2013 Volume 5 Issue 1 Pages 56-64
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Purpose: The purpose of this study is to compare the speech intelligibility between the immediate surgical obturator and the definitive obturator in Aramany class II cases.
    Methods: Ten maxillectomy patients in Aramany class II participated in this study. A speech intelligibility test with a 100 monosyllable Japanese intelligibility test sheet was carried out two times for each patient. The intelligibility with immediate surgical obturator and the intelligibility with definitive obturator were analyzed. The correcting rate of consonants were also analyzed.
    Results: The intelligibility with an immediate surgical obturator was 86.8%, and the intelligibility with definitive obturator was 89.2%. The significant difference was found between the immediate surgical obturators and the definitive obturators in dental consonants by the place of articulation classification (p=0.03).
    Conclusion: Not only the definitive obturator, but also the immediate surgical obturator is effective to improve the speech impairment for the maxillectomy patients in Aramany class II. However, the intelligibility of dental consonants are not as improved by the immediate surgical obturator as by the definitive obturator.
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Technical Procedure
  • Makoto Okamoto, Shogo Minagi
    2013 Volume 5 Issue 1 Pages 65-71
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Purpose: Maxillomandibular residual ridge relationship is one of the important pieces of information in prosthodontic treatment. However, visual examination of the casts on the articulator has been the only way that could easily be achieved in daily clinics. We have developed a simple method for the examination of maxillomandibular residual ridge relationship using digital image processing.
    Materials and methods: Standardized digital pictures of the upper and lower casts were taken using the indicator that was made to define the location, direction, and size of the picture. The standardized digital pictures were processed on a personal computer. The occlusal map that is the digital image that exactly reproduces the maxillomandibular residual ridge relationship is composed using digital processing software (Adobe Photoshop and so forth).
    Discussion: The occlusal map shows the image of the maxillomandibular residual ridge relationship viewing through the direction perpendicular to the occlusal plane. It is important information for prosthodontic treatment, and consequently the occlusal map is informative for the prosthodontic treatment planning and artifical tooth arrangement.
    Conclusion: Scientific and simple methods of analysis for the maxillomandibular residual ridge relationship was developed. The occusal map provides useful information to dentists and dental technicians for the planning of prosthodontic treatment and artificial tooth arrangement.
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Case Report (Specialist)
  • Takenori Yamanaka
    2013 Volume 5 Issue 1 Pages 72-75
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: The patient (an 83-year-old female) had high residual ridge resorption. A complete denture with a flange-technique treatment was immediately delivered to the maxilla and mandible to restore the occlusal-supporting area. A final complete denture with a flange-technique treatment was accomplished through the adjustment of provisional treatment dentures to satisfy the patient's concerns. A good prognosis was obtained during a 3-year period.
    Discussion: Restore the bilateral occlusal-supporting areas by denture with a flange-technique treatment that will contribute to the patient's satisfaction.
    Conclusion: A complete denture with a flange-technique treatment could stabilize the occlusal relationship immediately after loss of the occlusal-supporting area. A complete denture with a flange-technique treatment could also contribute to the patient's acceptance of and satisfaction with the final prosthesis.
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Case Reports (Specialist)
  • Masayasu Kageyama
    2013 Volume 5 Issue 1 Pages 76-79
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: A 65-year-old female patient presented dysfunction of masticatory with distal extension and esthetic dissatisfaction of the anterior teeth. Occlusal reconstruction was performed by dental implant and removable denture, then treatment of the anterior area.
    Discussion: The treatment denture was very concernment in barring any complications of maxillo-mandibular relations, in addition to the mandibular position of diagnosis and establish the therapeutic range. If necessary, change the therapeutic measures for the design denture for this case of asymmetrical dental treatment of the implant.
    Conclusion: Dysfunctions of masticatory caused by distal extension were improved by occlusal reconstruction with implant and removable denture.
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  • Jun Shimizu
    2013 Volume 5 Issue 1 Pages 80-83
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: The patient was a 55-year-old female who complained of difficulty of mastication with the mandibular right molar missing. To solve her chief complaint, an-implant-supported fixed partial denture was selected, because she had difficulty treating a removable partialdenture.
    Discussion: The chief complaint was improved by the treatment of implant prosthesis for a missing unilateral lower molar free-end. The patient's quality of life (QOL) was kept by the periodical follow-up. During the recall period of 15 years after the final restoration, neither progressive inflammation around the implant body nor fracture of the superstructure has been found.
    Conclusion: Implant prosthesis was useful to overcome the discomfort of an unsatisfactory removable partial denture.
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  • Yutaka Hosoda
    2013 Volume 5 Issue 1 Pages 84-87
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: The patient was a 38-year-old male with teeth mobility and esthetic appearance disorder. A root-fractured lateral incisor was extracted, and an ovate pontic was direct-bonded to adjacent teeth. The ovate pontic previously been made on a working cast.
    Discussion: A direct-bonding bridge was applied because of a request for an esthetic appearance at post-operation. It was a consideration using hybrid composite resin for ovate pontic material. After 3 years and 9 months, it was able to obtain the expected results that will keep the condition of papilla, alveolar bone, and gum level.
    Conclusion: A direct-bonding bridge for a missing lateral incisor was applied that resulted in a satisfactory long-term functional stable oral environment.
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  • Kazunobu Kamiya
    2013 Volume 5 Issue 1 Pages 88-91
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: A 54-year-old woman visited our department with chief complaints of poor appearance and masticatory disturbance as a result of diastema. After the gap was closed with minor tooth movement (MTM) treatment, prosthetic therapy using a removable partial denture with a custom-made attachment and magnetic attachment was performed.
    Discussion: Favorable results were obtained. The patient was satisfied with our treatments for aesthetic and masticatory functional points of view up to 11 years after denture delivery.
    Conclusion: A favorable course over a long period was obtained as a result of treatment for aesthetic disturbance from diastema by use of an MTM, as well as for masticatory disturbance by use of a removable partial denture with a custom-made attachment. Moreover, an improved periodontal condition and heightened motivation for plaque control were noted.
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  • Kenichi Matsuda
    2013 Volume 5 Issue 1 Pages 92-95
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: A 77-year-old male complained of disturbance caused by stability of complete dentures and discomfort while eating. The patient had severe bone resorption. Considering the area of mandibular ridge, we found that the stock trays couldn't take enough preliminary impressions. Then, after the individual tray was made twice and the PMP recorder was used, the complete denture was fabricated. After treatment, the patient had no complaints and was well satisfied.
    Discussion: In this case, after the appropriate individual tray was made and the comfortable vertical dimension was given, the complete dentures experienced improved masticatory function.
    Conclusion: In this case of severe bone resorption, appropriate individual trays and vertical dimension within a comfort zone were effective for a satisfactory outcome. The recovery of function by means of a complete denture with the appropriate above treatment and denture planning has resulted in a good prognosis.
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  • Takeyoshi Sugiura
    2013 Volume 5 Issue 1 Pages 96-99
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: A 77-year-old woman visited our clinic complaining of unaesthetic appearance and difficulty in chewing and speaking when wearing her dentures. She had removable partial dentures supported by her natural teeth, implants and edentulous regions, which caused impairment of her mastication, pronunciation and appearance. To overcome these problems, maxillary and mandibular cone-crown-telescope dentures were fabricated.
    Discussion: The use of newly fabricated cone-crown-telescope dentures improved the occlusal relationship and functional stability. Furthermore, a change of the denture design resulted in better oral hygiene, esthetics, and pronunciation.
    Conclusion: Cone-crown-telescope dentures for partially edentulous patients with a combination of natural teeth, implants and edentulous regions improved the patient's oral health related quality of life.
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  • Shin-ichiro Kawamoto
    2013 Volume 5 Issue 1 Pages 100-103
    Published: January 10, 2013
    Released on J-STAGE: February 22, 2013
    JOURNAL FREE ACCESS
    Patient: A totally edentulous 57-year-old male wanted new prostheses using dental implants. His chief complaint was an inadaptation to removable complete dentures because of epidermolysis bullosa hereditaria.
    Discussion: The restoration with an implant-supported removable bridge using a bar attachment for the edentulous mandible and a metal-base complete denture for the maxilla improved his masticatory function. It is considered that the bar attachment improved the support and the retention of the bridge, thereby greatly reducing the mechanical stress on the compromised oral mucosa.
    Conclusion: In a totally edentulous patient with an endermosis, the placement of new prostheses, of which exerted mechanical stress was considered to be within the capacity of oral mucosa, secured a successful clinical outcome.
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