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2002 Fiscal Year Final Research Report Summary

Three-dimensional occlusal examination of the contacts of maxillary premolars and molars in three different age groups

Research Project

Project/Area Number 13470423
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 補綴理工系歯学
Research InstitutionOsaka Dental University

Principal Investigator

KAWAZOE Takayoshi  Osaka Dental University Professor, 歯学部, 教授 (50076022)

Co-Investigator(Kenkyū-buntansha) TOSA Junichi  Osaka Dental University Assistant, 歯学部, 助手 (50148459)
KUSUMOTO Tetsuji  Osaka Dental University Lecturer, 歯学部, 講師 (70186394)
TANAKA Masahiro  Osaka Dental University Assistant Professor, 歯学部, 助教授 (60163573)
TATSUTA Mitsuhiro  Osaka Dental University Assistant, 歯学部, 助手 (60309185)
Project Period (FY) 2001 – 2002
KeywordsOcclusal contact / Intercuspal position / Occlusal examination / CAD (computer-aided design) / Elderly / Attrition
Research Abstract

We attempted to determine whether occlusal contacts of the maxillary premolars and molars changed with age. Silicone occlusal registration was taken for five subjects each in three age groups, young, middle-aged and elderly. The subjects had no restorations with full occlusal coverage. All readings were taken at 30% of maximum voluntary clenching in the intercuspal position. A non-contact three-dimensional form measuring device (Surflacer VMS-250R, Unisn Inc., Osaka Japan) digitized the silicone occlusal registration. The three-dimensional data were analyzed by CAD software (Surfacer, Imageware Inc., Michigan USA) with a personal computer. The occlusal surface of the maxillary premolars were divided into four regions: the buccal cusp, lingual cusp, mesial marginal ridge, and distal marginal ridge. The occlusal surface of maxillary molars were divided into six regions: the mesial buccal cusp, distal buccal cusp, mesial lingual cusp, distal lingual cusp, mesial marginal ridge, and distal … More marginal ridge. We evaluated the occlusal contacts, which were defined as less than 60 μm of silicone thickness between opposing teeth, and analyzed their number, rate, area, and orientation. We found that occlusal contacts on the functional cusps were significantly different between the young and middle-aged, and between the young and elderly.
The purpose of this study was to clarify the differences in amount and direction of mandibular displacement from habitual occlusal position to intercuspal position, between normal adults and volunteers with temporomandibular joint (TMJ) noise. The mandibular displacement in the volunteers with TMJ noise was larger than that in the normal adults. The direction of MOD (movement of dentition) was superior, and the direction of MOC (movement of condyle) was posterior, in all of the volunteers with TMJ noise. These results suggested that the mandibular displacement from habitual occlusal position to intercuspal position was associated with noise in the joint. Less

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 朴 康鉐: "健常者および顎機能障害者における習慣性咬合位から咬頭嵌合位への下顎変位の比較"日本補綴歯科学会雑誌. 47. 117-124 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐々木泰照: "三次元咬合検査法からみた上顎臼歯における年代別の咬合接触状態"歯科医学. 66. 86-96 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西川学: "歯周疾患患者のadd画像法による咬合接触状態について"日本顎頭蓋機能学会雑誌. 14. 33-38 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Park Gang-Suk: "Comparison of Mandibular Displacement from Habitual Occlusal Position to Intercuspal Position in Normal Adults and Volunteers with Temporomandibular Disorders"The Journal of Japan Prothodontic Society. 47-1. 117-124 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] SASAKI Y: "Three-dimensional occlusal examination of the contacts of maxillary premolars and molars in three different age groups"JOURNAL OF OSAKA ODONTOLOGICAL SOCIETY. 66-1. 86-96 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] NISHIKAWA M: "The Analysis of Occlusal Contacts in Patients with Periodontal Disease by Add-Picture System"The Journal of the Japan Association of Cranio-Mandibular Orthopedics. 14-1. 33-38 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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