Kelsey William P, Latta Mark A, Kelsey Matthew R
Creighton University School of Dentistry, Omaha, NE 68178, USA.
J Prosthodont. 2008 Jun;17(4):269-73. doi: 10.1111/j.1532-849X.2007.00275.x. Epub 2007 Dec 17.
Practitioners have several options during the selection of a dowel for core restoration, including metal and glass fiber materials. Retention of the cemented dowel is critical for the success of this type of restoration. The purpose of this in vitro study was to evaluate the effect of two surface treatments on the retention of three types of dowels placed into prepared canals with a resin cement.
Following the removal of the clinical crown, gutta percha was used to restore canals prepared to size 40 in 90 extracted human anterior teeth. The access openings were then sealed, and the teeth stored in water for 3 weeks at 37 degrees C. Post preparations were made to a depth of 9 mm, and parallel ParaPost, FibreKleer, and FibreKor dowels were each used to restore 30 teeth. Ten dowels in each group received no surface roughening treatment, 10 were air abraded with 50 mu aluminum oxide, and 10 were air abraded with CoJet. The specimens were stored in water for 24 hours at 37 degrees C following dowel placement and prior to debonding with an Instron Testing Machine.
The forces (N) required in tensile load to dislodge the dowels for each group were: ParaPost/CoJet 214.04 +/- 91.72, FibreKleer/AlOxide 196.07 +/- 57.69, ParaPost/AlOxide 184.46 +/- 35.05, FibreKleer/CoJet 176.36 +/- 42.43, FibreKor/AlOxide 174.32 +/- 53.64, ParaPost/Unroughened 174.14 +/- 40.74, FibreKor/CoJet 167.16 +/- 35.94, FibreKor/Unroughened 116.69 +/- 37.01, and FibreKleer/Unroughened 96.88 +/- 33.45. Post hoc analysis demonstrated that the unroughened FibreKor and FibreKleer dowels had significantly less retention than all other test groups (p < or = 0.05).
Surface roughening with air abrasion increases retention in dowels cemented with a resin cement. Both the aluminum oxide and CoJet systems were equally effective in this regard.
在选择用于核修复的桩钉时，从业者有多种选择，包括金属和玻璃纤维材料。粘结桩钉的固位对于这类修复的成功至关重要。本体外研究的目的是评估两种表面处理对三种类型的桩钉用树脂粘结剂置入预备根管后的固位效果。
去除临床牙冠后，用牙胶尖修复90颗拔除的人前牙中预备至40号的根管。然后封闭进入开口，将牙齿在37℃水中储存3周。进行桩道预备至9mm深度，分别用平行的ParaPost、FibreKleer和FibreKor桩钉修复30颗牙齿。每组10颗桩钉不进行表面粗糙化处理，10颗用50μm氧化铝进行空气喷砂处理，10颗用CoJet进行空气喷砂处理。桩钉置入后，在使用Instron试验机进行脱粘前，将标本在37℃水中储存24小时。
每组桩钉在拉伸载荷下脱位所需的力（N）分别为：ParaPost/CoJet 214.04±91.72、FibreKleer/AlOxide 196.07±57.69、ParaPost/AlOxide 184.46±35.05、FibreKleer/CoJet 176.36±42.43、FibreKor/AlOxide 174.32±53.64、ParaPost/未粗糙化 174.14±40.74、FibreKor/CoJet 167.16±35.94、FibreKor/未粗糙化 116.69±37.01、FibreKleer/未粗糙化 96.88±33.45。事后分析表明，未粗糙化的FibreKor和FibreKleer桩钉的固位力明显低于所有其他测试组（p≤0.05）。
空气喷砂表面粗糙化可增加用树脂粘结剂粘结的桩钉的固位力。在这方面，氧化铝和CoJet系统同样有效。
