幾丁聚醣與其交聯物質修飾鈦合金表面之生物相容性研究

The Study of Biocompatibility of Surface Modified Titanium Alloys by Chitosan and Its Crosslinked Agent

陳靜慧(Jing-Huei Chen)

指導教授 ： 林忻怡

國立臺北科技大學/工程學院/生物科技研究所/碩士(2011年)

摘要

鈦與鈦合金為常見的金屬植體且被廣泛地使用在牙科及骨科手術上，因為鈦與鈦合金具有良好的機械性質及生物相容性，然而，以鈦金屬做為植體在臨床上仍然有一些缺點，因為不適當的細胞貼附或植體對細菌的易感染性而導致 植體與骨頭組織接觸面造成磨擦而產生鬆動，抑或作為植體經過長期磨損會釋放出金屬粒子，對骨骼生成造成影響；因此，本研究以鈦金屬作為基質，經由表面鈍化處理後，利用幾丁聚醣(Chitosan)塗佈於金屬上，並分別以褐藻酸(Alginate)、槴子素(Genipin)及果膠(Pectin)等天然高分子與幾丁聚醣塗層交聯，其後進行物理性測試及生物相容性測試。物理測試實驗結果顯示經由褐藻酸及果膠交聯的幾丁聚醣材料在澎潤率、藥物釋放及酵素降解都較經由槴子素交聯的材料來的高；另外，在細胞相容性測試方面，以CCK-8測定細胞活性，經由骨母細胞分化指標測試該材料的生物相容性，透過LIVE/DEAD assay及掃描試電子顯微鏡觀察細胞生長型態，以及利用Von Kossa染色及鈣質定量觀察骨母細胞礦化程度。實驗結果顯示，以幾丁聚醣塗層與幾丁聚醣-褐藻酸及幾丁聚醣-果膠三個組別有較佳的細胞增生效果，膠原蛋白分泌、鹼性磷酸酶活性及骨鈣化程度也較幾丁聚醣-槴子素組別及鈦合金高，因此，表面改質以共價鍵結接上幾丁聚醣以及其離子型鍵結交聯褐藻酸和果膠等材料，可使金屬表面藉由骨母細胞功能的提升而促進骨整合的效果。

關鍵字

鈦合金 ； 表面改植 ； 幾丁聚醣 ； 骨母細胞

並列摘要

Titanium and titanium alloy are commom metal implants widely used in dental and orthopedic surgery because of their excellent biocompatibility and mechanical properties. However, titanium-based implants are still associated with clinical challenges, unsatisfactory cell adhesion and the susceptibility of the implants to bacterial infections may lead to loose at interface of implant and bone. Hence, the surface modification of titanium alloy is often performed to improve the bone-implant contact and biological properties. In this study, the surface of titanium alloy substrates was first functionalized by covalently grafted chitosan. The crosslinked solution, such as alginate, pectin and genipin, was then coated on the chitosan-grafted surface by ionic or covalent binding. Swelling ratio and biodegradation was evaluated in this study. Differences in growth were attributed to differences in modified surface material, though all coatings were judged to be osteocompatible in vitro. The osteoblastic cells on the grafted-chitosan and crosslinked with alginate and pectin materials expressed much higher collagen, alkaline phosphatase levels, and calcium deposition than those on the uncoated Ti and cresslinked with genipin substrates. Thus, utilizing surface-grafted chitosan and it crosslinked with alginate and pectin to modify the metal surface provides a promising means for enhancing bone integration of implants by promoting osteoblast functions.

並列關鍵字

titanium alloy ； surface modification ； chitosan ； osteoblast

參考文獻

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