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研究生:吳如惠
研究生(外文):Ju-Hui Wu
論文名稱:不同局部活動義齒設計之應力分析
論文名稱(外文):Stress distribution of removable partial denture with different designs
指導教授:李惠娥李惠娥引用關係王兆祥
指導教授(外文):Huey-Er LeeChau-Hsiang Wang
學位類別:碩士
校院名稱:高雄醫學大學
系所名稱:牙醫學研究所
學門:醫藥衛生學門
學類:牙醫學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:92
中文關鍵詞:光彈應力分析局部活動義齒設計義齒基底所分擔的應力及比率
外文關鍵詞:photoelastic stress analysisRPD different designsdenture base shearing load and ratio
相關次數:
  • 被引用被引用:1
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游離端(free-end)缺牙是臨床上相當常見的缺牙狀態。此種情形常會以局部活動義齒來修復,而修復時常會使牙醫師發生很大的困窘,也常常造成患者的痛苦。其主要原因為遠伸性(distal extension)局部義齒的兩種支持組織─支柱牙的牙周膜及齒槽黏膜的支持能力具有極大的差異性。為此之故在設計上,有以保護支柱牙為主之傳統flexible support理念的維持器(retainer),以及儘量把支持給支柱牙之rigid support理念的維持器。而本實驗則以類三次元光彈應力分析法(quasi - 3D photoelastic stress analysis)來進行分析:下顎單側游離端缺牙受力時應力分布的狀態,支柱牙分別為34、37及44,以PL-1及PL-2光彈樹脂分別模擬支柱牙及齒槽骨嵴、addition permanent silicone soft liner模擬齒槽黏膜。分別比較不同維持器所設計之9組不同局部活動義齒,在支柱牙44的設計分別有阿克斯牙鉤、Krol type RPI clasp、鍛製金屬線牙鉤、RPPI clasp及conical crown telescope,在支柱牙37的設計則有阿克斯牙鉤及環鉤。並測量其游離端義齒基底所分擔之應力及比率(denture base shearing load and ratio)。結果發現在光彈模型的應力分布上以rigid support為理論的維持器,如conical crown telescope所產生的力量大小在支柱牙及齒槽骨嵴上較為平均,且在義齒基底所分擔的應力值只有1.05 kg;以具有flexible support為理論之維持器,鍛製金屬線牙鉤的設計在齒槽骨嵴造成最明顯的應力集中情形,在義齒基底所分擔的應力值有5.59 kg。以Oneway ANOVA進行分析發現兩者間具有統計學上的意義。
When a removable partial denture (RPD) is expected to restore the missing posterior teeth in distal free-end edentulous ridges, the designs of a distal extension RPD constantly make dentists so puzzles and cause the patient’s discomfort. To prevent abutment teeth from being harmed, some designs and devices called stress-breakers have been developed over the past half-century. On the contrary, the other controversial design philosophy ─ the ”rigid support” design, also advocated in a lot of articles. Therefore, The purposes of this study were to compare the various retainer designs that belonged to the two different designing philosophies.
The technique of quasi-three dimensional photoelastic stress analysis was used for this investigation. Photoelastic model was made with individual simulative materials for tooth structure (PL-1) and alveolar bone (PL-2). A model was fabricated that included the anterior teeth, right 1st premolar, left 1st premolar and 2nd molar. RPD designs included wrought wire clasp, Krol’s RPI clasp, RPPI clasp, the conical crown telescopic retainer, Aker’s clasp and ring clasp. This study indicated that the unfavorable stress gradient was found in wrought wire clasp design, the maximum stress concentrated at residual ridge while the minimum stress occurred at abutment teeth and the value of denture base shearing ratio is 30.25% in the design of wrought wire clasp. The minimum stress gradient between the abutments and the residual ridge was found in conical crown telescopic retainer and the value of denture base shearing ratio is 5.73%. This study concluded that minimum stress gradient between the abutments and the residual ridge might be the most important issue when fabricated an adoptable RPD.
頁 次
中文摘要
英文摘要
第一章 緒論
第一節 研究背景------------------------------------------------------------1
第二節 文獻探討------------------------------------------------------------6
第三節 光彈應力分析簡介-----------------------------------------------13
第四節 研究目的-----------------------------------------------------------16
第二章 材料與方法
第一節 模型製作-----------------------------------------------------------18
第二節 析量冠的製備-----------------------------------------------------20
第三節 義齒基架的製備--------------------------------------------------22
第四節 圓盤製作及測試--------------------------------------------------23
第五節 校正工作-----------------------------------------------------------24
第六節 模型測試-----------------------------------------------------------25
第七節 統計分析-----------------------------------------------------------26
第三章 結果
第一節 模型之材料條紋--------------------------------------------------27
第二節 應力分布圖----------------------------------------------------- -27
第三節 義齒基底的剪應力及比率-------------------------------------30
第四章 討論
第一節 實驗方法的採用------------------------------------------------- 31
第二節 本實驗不同局部活動義齒的比較-----------------------------32
第三節 與其他學者研究之比較---------------------------------------- 34
第四節 本實驗之限制性------------------------------------------------- 36
第五章 結論與未來研究方向---------------------------------------------39
第六章 參考文獻----------------------------------------------------------- 40
表格---------------------------------------------------------------------- ---------48
圖形-------------------------------------------------- ----------------------------64

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