• 沒有找到結果。

中國醫藥大學機構典藏 China Medical University Repository, Taiwan:Item 310903500/25040

N/A
N/A
Protected

Academic year: 2021

Share "中國醫藥大學機構典藏 China Medical University Repository, Taiwan:Item 310903500/25040"

Copied!
5
0
0

加載中.... (立即查看全文)

全文

(1)

行政院國家科學委員會專題研究計畫成果報告

計畫編號:NSC 90-2314-B-039-017

執行期限:90 年 8 月 1 日至 91 年 7 月 31 日

主持人:陳三餘

執行機構及單位名稱:中國醫藥學院牙醫系

一、中文摘要 為求改善義齒床用壓克力樹脂之機械 性質,本次實驗擬選用聚酯纖維及四種填

料:SiO2,Zirconium,glass beads,與NSi

微粒,作為強化材料。實驗標本分為三組: 第一組為市販義齒床用壓克力樹脂作為對 照組。第二組為壓克力樹脂中加入3 wt% 6 mm長之聚酯纖維。第三組則於加有3wt% 6mm 長聚酯纖維之壓克力樹脂中,分別加入不 等重量比之各類填料。實驗方法為:首先 以各種組成條件作成長70mm寬25mm厚15mm 之樹脂塊共12塊,其中5塊依ASTM256號規 格所述之方法,以標本切割機切出5個撞擊 強度之標本並測試其強度,使用過之撞擊 強度標本再用來測試諾氏硬度。其他之1塊 依ISO1567號規格所述之方法,切取彎曲強 度之標本6個並測試其強度。所得實驗之結 果顯示:添加纖維及填料之撞擊強度為未 加纖維組之7倍,添加填料可增加材料之表 面硬度,彎曲強度則未見有明顯之變化。 關鑑詞:壓克力樹脂,機械強度,撞擊強 度,表面硬度,彎曲強度 Abstract

In order to improve the mechanical properties of acrylic denture base resin, This study was designed to evaluate the effects of polyester

fibers and four kinds of fillers ( SiO2,

Zirconium, glass bead and NSi particle) as reinforcing material. Specimens were divided into 3 groups. In group 1, acrylic resin will be used as control group. In group 2, 3 wt% and 6 mm in length polyester fibers were mixed into acrylic resin. In group 3,various

concentrations of each kind of microfillers were incorporated into resin mixtures that containing 3 wt%, 6 mm in length polyester fibers. The test procedure as follows: all of the groups were prepared into twelve 70x25x15 mm resin blocks first. Then 5 resin blocks following the

specifications of ASTM No.256 to cut into 5 specimens for impact strength test, the specimens used will be reused for Knoop hardness number test . Another 1 block following the specifications of ISO No.1567 to cut into 6 specimens for bending strength test. The results revealed that all the fiber and filler reinforced materials have 7 times increased on impact strength and surface hardness, but no changes on bending strength.

Keywords: Acrylic resin, Mechanical

properties,impact strength, surface hardness, bending strength 二、緒言 牙科臨床上可撤性義齒之製作目前仍 以壓克力樹脂材料為主,然實用上最大之 問題在於義齒可能會因咬合力之分佈不均 或取出清洗時不慎掉落而斷裂(1),雖然此種 情形可用常溫聚合型樹脂再黏合(2~5),但因 材質不同故,常於原斷裂處重新裂開,故 如何加強樹脂材料本身之強度以減少斷裂 之發生,乃為本研究之主要目的。目前被 用來解決此一問題之方法大致可分成三

(2)

種:(1)添加化學物質使形成共聚合體以增 加強度(6)。(2)使用金屬線加強,或部份結 構用金屬取代(7~9)。(3)添加各種纖維材料於 樹脂材料中(10~12)。第一種雖可利用各種多官 能基之架橋劑或彈性體(elastomer)來增 加其硬度或韌性,但硬度增加脆性也增 大,韌性雖提高但效果似乎不明顯,故並 不十分理想(13,14)。第二種方法歷年來雖有壓 印床或鑄造金屬床之開發,但因製造手續 繁雜所需之設備昂貴,相對成本也提高, 實不符經濟效益(15,16)。至於添加金屬線之方 法則需要熟練之技巧,操作並不容易。第 三種方法則多年來各種纖維材料如:碳纖 維、玻璃纖維、或各種纖維布等均曾被使 用過,也有見其強度略有增加者,但仍因 操作性及美觀等問題而無法達到實用化之 程度(17~19)。綜上理由,個人曾嘗試選用淡色 或透明之纖維預先裁成不等之長度,並依 不同之重量添加於義齒床用壓克力樹脂 中,以求增加強度及克服美觀及操作性等 問題 。實驗結果顯示:雖然影響美觀之問 題可獲解決,且可增加數倍之撞擊強度, 但對於彎曲強度、表面硬度等機械性質卻 未能見到明顯之增強效果,甚有減弱之趨 勢(20-22) 。為期解決此一負面影響,本次實驗 擬參考前己發表之相關實驗,採用同時添 加聚酯纖維與填料之方法來解決此一問 題,希望能使義齒床用壓克力樹脂材料之 撞擊強度增加外,彎曲強度、表面硬度等 機械性質也能獲得較多之改善。 三、結果與討論 1. 撞 擊 強 度 之 測 試 結 果 顯 示 添 加 3% polyester 纖維後再加各種填料其強度 可增加 6 至 7 倍在各種填料中仍以添加 0.5g 之 SiO2 效 果 最 佳 (7.217 ± 1.294KJ/m2 ) 。 2. 表面硬度之測試結果顯示添加各種無 機填料均有效果,其中則以 Zr1g 之效 果最好(21.9±3.9kg/cm2 )。 3. 彎曲強度未見明顯之變化。唯添加較多 者似乎強度有減弱之傾向。各種填料中 以添加 Glass bead 1 g 之條件最好 (1176.74±72.38kg/cm2 )。 4. 綜合本次實驗之結果可知單純添加聚 酯纖維可增強撞擊強度之效果再度獲得印 証,而因纖維之添加所引起的表面硬度減 少的缺點,也因無機填料之使用而獲得比 原來更為增強之效果。至於彎曲強度未見 明顯之變化,正可符合實驗規格中對於此 項性質有一不可過高或過低之要求。整体 而言經由本次實驗所選用之材料及測式方 法己証明達到所欲克服之缺點。而最後獲 得之最佳條件應為添加 3wt%之聚酯纖維 與 2wt%之 Zirconium powder 最為理想。 四、參考文獻

[1] Darbar UR, Huggett R, Harrison A.

Denture fracture: a survey. Br Dent J , 176:342-345,1994.

[2] Beyli MS, von Fraunhofer JA. Repair

of fracture acrylic resin. J Prosthet Dent ,44:497-503,1980.

[3] Harison A,Belton EL,Meades K. Do

self-curing acrylic resin repairs gain strength with age? J Dent, 5:334-338,1977.

[4] Stipho HD, Stipho AS. Effectiveness

and durability of repaired acrylic resin Joints. J Prosthet

Dent,58:249-253,1987.

[5] Norma O., Waldemar G. de Rijk. Effect

of surface treatments on the repair strength of a light activated denture repair resin using censord data. Dent Mater, 10:122-127,1994.

[6] Matsukawa S., Hayakawa T., Nemoto K.

Development of high-toughness resin for dental applications. Dent Mater,10:343-346,1994.

[7] Carrol CE, von Fraunhofer JA. Wire

reinforcement of acrylic resin prostheses. Jn prosthet

Dent,52:639-641, 1984.

[8] Ruffino AR. Effect of steel

strengtheners on fracture

resistance of the acrylic resin complete denture base. J Prosthet Dent,54:75-78, 1985.

9.Vallittu PK. Effect of some

properties of metal strengtheners on the fracture resistance of acrylic

(3)

denture base material construction. J Oral Rehabil , 20:241-248, 1993. 10.Grave AM, Chandler HD, Wolfaadt JF.

Denture base acrylic reinforced with high modulus fiber.Dent Mater, 1:185-187,1985.

11.Manley TR, Bowman AJ,Cook M. Denture base reinforced with carbon fibers. Br Dent J ,146:25-28, 1979.

12.Goldberg AJ, Burstone CJ. The use of continuous fiber reinforcement in dentistry. Dent Mater,

8:197-202,1992.

13.Robinson, McCabe JF. impact

strength of acrylic resin denture base materials with surface defects. Dent Mater, 9:355-360,1993.

14.Craig R G. Restorative dental materials. 8th ed, Mosby,P.515, 1989.

15.Vallittu PK , Lassila VP. Effect of metal strengthener,s surface

roughness on fracture resistance of acrylic denture base material. J Oral Rehabil ,19:225-230, 1992. 16.Hero H, Ruyter IE, Waarli

ML,Hultquist. Adhesion of resins to Ag-Pd alloys by means of the

silicoating technique. J Dent Res, 66:1380-1385, 1987.

17.Nikos GK, Robin H, Alan H,Richard WV. The effect of esthetic fibers on the properties of an acrylic resin denture base material. Dent Mater ,10:2-5,1994.

18.Vallitu PK,BOdont DT,Lassila VP,Lappalainen R. Acrylic

resin-fiber composite-Part Ⅰ:The effect of fiber concentration on fracture resistance. J Prosthet Dent,71:607-612,1994.

19.Vallitu PK.Comparison of two different silane compounds use for improving adhesion between fibers and acrylic denture base material. J Oral Rehabil ,20:533-539, 1993. 20.陳三餘︰纖維強化塑膠在義齒床之應 用。中國醫藥學院研究年報第十七期 pp.184-195, 1991. 21.陳三餘,劉奕祥,梁文敏:(1999)義齒 床用壓克力樹脂機械性質之改良研 究。Chin Dent 18(2): 121-130.

22.San-Yue Chen,Wen –Miin Liang, Pau-Su Yen: (2001) Reinforcement of acrylic denture base resin by incorporation of various fibers. J Biomed Mater Res .

(4)

附件:封面格式

行政院國家科學委員會補助專題研究計畫成果報告

※※※※※※※※※※※※※※※※※※※※※※※※※※

聚酯纖維與填料之添加對義齒床用樹脂強化效果之評估

※ ※

※※※※※※※※※※※※※※※※※※※※※※※※※※

計畫類別:□個別型計畫

□整合型計畫

計畫編號:NSC90-2314-B-039-017

執行期間:

90 年 8 月 1 日至 91 年 7 月 31 日

計畫主持人:陳三餘

共同主持人:

計畫參與人員:

本成果報告包括以下應繳交之附件:

□赴國外出差或研習心得報告一份

□赴大陸地區出差或研習心得報告一份

□出席國際學術會議心得報告及發表之論文各一份

□國際合作研究計畫國外研究報告書一份

執行單位:中國醫藥學院牙醫系

(5)

5

參考文獻

相關文件

臺大機構典藏NTUR (National Taiwan University 二 Repository, http://ntur.lib.ntu.edu.tw) 經驗與協助推 動臺灣學術機構典藏TAIR (Taiwan Academic Institutional Repository,

In particular, we present a linear-time algorithm for the k-tuple total domination problem for graphs in which each block is a clique, a cycle or a complete bipartite graph,

Al atoms are larger than N atoms because as you trace the path between N and Al on the periodic table, you move down a column (atomic size increases) and then to the left across

You are given the wavelength and total energy of a light pulse and asked to find the number of photons it

Then, we tested the influence of θ for the rate of convergence of Algorithm 4.1, by using this algorithm with α = 15 and four different θ to solve a test ex- ample generated as

Particularly, combining the numerical results of the two papers, we may obtain such a conclusion that the merit function method based on ϕ p has a better a global convergence and

Then, it is easy to see that there are 9 problems for which the iterative numbers of the algorithm using ψ α,θ,p in the case of θ = 1 and p = 3 are less than the one of the

incapable to extract any quantities from QCD, nor to tackle the most interesting physics, namely, the spontaneously chiral symmetry breaking and the color confinement.. 