Ausiello P, De Gee A J, Rengo S, Davidson C L
Department of Endodontology and Cariology, School of Dentistry, University of Naples Federico II, Italy.
Am J Dent. 1997 Oct;10(5):237-41.
To investigate the cusp fracture resistance of endodontically treated teeth, adhesively restored with various materials.
MOD preparations and endodontic treatment was carried out on extracted sound maxillary premolars. The cavities were restored with the amalgam Valiant in combination with Superbond or Panavia bonding, the resin composites Z100, Herculite XRV or Clearfil RP with their respective bonding systems, Z100 in combination with the glass ionomers Ketac Fil, Fuji II and Vitremer, and Tetric in combination with Compoglass. Fracture resistance was measured by axial loading in an Instron testing machine.
One of the restorative methods, resin composites in combination with dentin bonding systems in beveled MOD preparations rendered the tooth a cusp fracture resistance which did not differ significantly from that of sound natural teeth. Two other restorative methods, bonded amalgam and a sandwich of glass ionomer cement/resin composite in beveled preparations were significantly weaker in resisting cusp fracture than sound natural teeth, but still significantly stronger than the unrestored tooth with a MOD preparation. It was statistically apparent that several adhesive restorative systems could satisfactorily be used to restore teeth after endodontic therapy.
研究经根管治疗的牙齿用不同材料进行粘结修复后的牙尖抗折性。
对拔除的健康上颌前磨牙进行MOD洞形预备和根管治疗。窝洞分别用汞合金Valiant联合Superbond或Panavia粘结剂、树脂复合材料Z100、Herculite XRV或Clearfil RP及其各自的粘结系统、Z100联合玻璃离子水门汀Ketac Fil、Fuji II和Vitremer，以及Tetric联合Compoglass进行修复。通过Instron测试机轴向加载来测量抗折性。
在倾斜的MOD洞形预备中，树脂复合材料与牙本质粘结系统联合使用的一种修复方法使牙齿的牙尖抗折性与健康天然牙相比无显著差异。另外两种修复方法，即粘结汞合金以及在倾斜预备中使用玻璃离子水门汀/树脂复合材料夹层，在抵抗牙尖折裂方面明显弱于健康天然牙，但仍明显强于有MOD洞形预备的未修复牙齿。从统计学上看，几种粘结修复系统可令人满意地用于根管治疗后的牙齿修复。
