Norio Takishin

Survey on use of titanium dentures in Tsurumi University Dental Hospital for 11 years

PURPOSE The purpose of this study was to survey the production of titanium dentures in Tsurumi University Dental Hospital and to study the actual use of titanium dentures in our university. METHODS The survey was based on the metal base dentures produced at Tsurumi University Dental Hospital during an 11-year period between April 1995 and March 2006, with relation to the types of metals used in the dentures, types of dentures, dental condition, and the number of artificial teeth. RESULTS 1871 metal base dentures were produced in the study period. The dentures consisted of 1290 cobalt-chromium alloy dentures (68.9%), 350 titanium dentures (18.7%) and 231 platinum-added gold alloy dentures (12.3%). Within the titanium denture groups, 132 were complete dentures (37.7%), 55 were complete overdentures (15.7%) and 163 were removable partial dentures (46.6%). JIS type 3 pure titanium was used in the titanium base of 252 dentures (72.0%). The average number of artificial teeth was 10.9, which was the highest among the three types of metal bases, exhibiting significant differences (P<0.01). CONCLUSION Approximately 32 titanium dentures per year on average were delivered at our university and they were applied to almost edentulous arch compared with the other metal base dentures.

Prevalence of Bone Change in the Condyle with Panorama Radiographic Findings-For Patients Having No Complaint in Temporomandibular Joint-

目的: 本研究は, 顎関節症を主訴とせず, 歯や歯周組織などの観察を目的に撮影されたパノラマX線像を対象に, 下顎頭骨変化の出現頻度を調査し, 骨変化と年齢, 性別, 欠損型や咬合の支持との関連について検討を加えたものである.方法: 1999年12月から2000年3月の間に鶴見大学歯学部附属病院で, 各科から依頼され, 画像検査部においてパノラマX線撮影を行った25歳以上の患者, 970名を対象として調査を行った. 下顎頭の骨変化としてErosion, Osteophyte, Deformityを評価し, さらに年齢, 性別, 欠損型, 咬合の支持 (Eichnerの分類に準じた分類) について検討を加えた.結果: 調査対象970名中, 骨変化を認めたものは113名 (11.6%) で, 出現頻度は男性よりも女性に高かった (有意差あり, 女性14.4%, 男性7.8%).女性では, 骨変化の出現頻度は各年代ともに大きな差はなく, 年齢, 欠損型, 咬合の支持では有意差は認められなかった. 男性では咬合の支持の減少と65歳以上の年齢で骨変化の出現頻度が高くなる傾向にあった. 骨変化所見はDeformityが最も多く, Deformity, Erosionは若い層に, Osteophyteは高齢者層に多かった.結論: 顎関節症を主訴としない患者の11.6%に下顎頭の骨変化が認められ, 出現頻度は性別によって大きく異なることが判明した.