中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2011年
2期
89-93
,共5页
桩核技术%牙黏合%薄片推出实验
樁覈技術%牙黏閤%薄片推齣實驗
장핵기술%아점합%박편추출실험
Post and coren technique%Dental bonding%Thin-slice push-out test
目的 利用薄片推出实验检测脱水及再湿润过程中纤维桩与根管各区段的粘接强度及粘接耐久性,以期为临床桩核修复提供实验依据.方法 将36颗离体牙用随机数字表均分为过干燥组、再湿润组及对照组,分别进行纤维桩粘接,将牙根横向切割为1.0 mm厚的切片,每颗牙选取根颈部、根中部和根尖部各2个切片,即刻及水储存2个月后进行薄片推出实验,并对破坏试件进行扫描电镜观察.结果 过干燥组、再湿润组和对照组纤维桩即刻实验的粘接强度分别为(5.97±1.97)、(7.67±2.19)和(8.46±2.35)MPa;水储存2个月后粘接强度分别为(2.08±1.67)、(2.99±1.48)、(3.22±1.43)MPa.即刻实验和水储存2个月后,过干燥组与再湿润组、过干燥组与对照组间差异均有统计学意义(P＜0.05).根颈段牙本质比根管其他区段能提供更大的粘接强度(P＜0.05);水储存对纤维桩粘接强度有显著影响(P＜0.05).结论 根管过度吹干处理可影响纤维桩的粘接强度及粘接耐久性.水灌注可使过干燥管壁牙本质重新恢复湿润状态,恢复纤维桩正常的粘接强度及粘接耐久性.
目的 利用薄片推齣實驗檢測脫水及再濕潤過程中纖維樁與根管各區段的粘接彊度及粘接耐久性,以期為臨床樁覈脩複提供實驗依據.方法 將36顆離體牙用隨機數字錶均分為過榦燥組、再濕潤組及對照組,分彆進行纖維樁粘接,將牙根橫嚮切割為1.0 mm厚的切片,每顆牙選取根頸部、根中部和根尖部各2箇切片,即刻及水儲存2箇月後進行薄片推齣實驗,併對破壞試件進行掃描電鏡觀察.結果 過榦燥組、再濕潤組和對照組纖維樁即刻實驗的粘接彊度分彆為(5.97±1.97)、(7.67±2.19)和(8.46±2.35)MPa;水儲存2箇月後粘接彊度分彆為(2.08±1.67)、(2.99±1.48)、(3.22±1.43)MPa.即刻實驗和水儲存2箇月後,過榦燥組與再濕潤組、過榦燥組與對照組間差異均有統計學意義(P＜0.05).根頸段牙本質比根管其他區段能提供更大的粘接彊度(P＜0.05);水儲存對纖維樁粘接彊度有顯著影響(P＜0.05).結論 根管過度吹榦處理可影響纖維樁的粘接彊度及粘接耐久性.水灌註可使過榦燥管壁牙本質重新恢複濕潤狀態,恢複纖維樁正常的粘接彊度及粘接耐久性.
목적 이용박편추출실험검측탈수급재습윤과정중섬유장여근관각구단적점접강도급점접내구성,이기위림상장핵수복제공실험의거.방법 장36과리체아용수궤수자표균분위과간조조、재습윤조급대조조,분별진행섬유장점접,장아근횡향절할위1.0 mm후적절편,매과아선취근경부、근중부화근첨부각2개절편,즉각급수저존2개월후진행박편추출실험,병대파배시건진행소묘전경관찰.결과 과간조조、재습윤조화대조조섬유장즉각실험적점접강도분별위(5.97±1.97)、(7.67±2.19)화(8.46±2.35)MPa;수저존2개월후점접강도분별위(2.08±1.67)、(2.99±1.48)、(3.22±1.43)MPa.즉각실험화수저존2개월후,과간조조여재습윤조、과간조조여대조조간차이균유통계학의의(P＜0.05).근경단아본질비근관기타구단능제공경대적점접강도(P＜0.05);수저존대섬유장점접강도유현저영향(P＜0.05).결론 근관과도취간처리가영향섬유장적점접강도급점접내구성.수관주가사과간조관벽아본질중신회복습윤상태,회복섬유장정상적점접강도급점접내구성.
Objective To analyze the push-out bond strength of fiber post and the durability of interface between dentin and composite resin during over drying and re-wetting of root canal. Methods Thirty-six extracted human maxillary central incisors were randomly divided into three groups: Group A for the process of over drying, Group B for re-wetting, Group C for control. All teeth were sliced into several thin discs with thickness of 1.0 mm for micro push-out test and scanning electron microscope (SEM)observation. Results Push-out shear strengths of fiber post immediately after bonding in group A, B and C were (5. 97 ± 1.97), (7.67 ± 2. 19) and (8. 46 ± 2. 35) MPa. Push-out strengths of fiber post two months after water storage were (2. 08 ± 1.67), (2. 99 ± 1.48) and (3. 22 ± 1.43) MPa. There was significantly difference in push-out strength between Group A and Group B(P ＜0. 05). Significantly difference in pushout strength was also found between Group A and Group C. In the condition of immediate testing, there was also significantly difference between push-out strength of cervical slice and middle slice, and between cervical slice and apical slice(P ＜0. 05). The water storage time has significant effect on the push-out bond strength of fiber posts (P ＜ 0. 05). Conclusions Inappropriate condensation air blowing operation can cause extracted teeth root canal dentin over dry. Dehydration can destroy the formation of general structure of interface between composite resin and dentin. The over dry dentin can be turned back to wetting stage by water pouring, which can help fiber-reinforced composite post regain its normal retention strength and original adhesive durability.
