Llena-Puy M C, Forner-Navarro L, Barbero-Navarro I
Department of Somatology, Faculty of Medicine and Dentistry, University of Valencia, Spain.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2001 Nov;92(5):553-5. doi: 10.1067/moe.2001.117262.
We sought to examine the clinical conditions under which 25 endodontically treated teeth underwent vertical root fracture (VRF) and to relate this condition to the time elapsed from endodontic treatment to fracture.
This was a retrospective study in which we reviewed 25 case histories of patients with postendodontic VRF and studied the effect of various pretreatment and posttreatment factors as they related to VRF.
The mean time to VRF was 54 months; this was not significantly influenced by the presence or absence of prior restoration or by the presence or absence of a crown fitting. The use of a prefabricated, cylindrical, cemented intraradicular retainer increased the time between endodontics and VRF. Teeth restored with conventional amalgam took significantly longer to undergo VRF than those restored with composite or bonded amalgam. In contrast, amalgam-restored teeth suffered more coronal fractures before VRF than did teeth in the other 2 groups.
我们试图研究25颗经牙髓治疗的牙齿发生垂直根折（VRF）的临床情况，并将这种情况与从牙髓治疗到根折所经过的时间联系起来。
这是一项回顾性研究，我们回顾了25例牙髓治疗后发生VRF的患者的病历，并研究了各种治疗前和治疗后因素与VRF的关系。
发生VRF的平均时间为54个月；这不受先前是否有修复体或是否有冠修复的显著影响。使用预制的圆柱形粘结根管内固位体可延长牙髓治疗与VRF之间的时间。用传统银汞合金修复的牙齿发生VRF的时间明显长于用复合树脂或粘结银汞合金修复的牙齿。相比之下，在发生VRF之前，银汞合金修复的牙齿比其他两组的牙齿发生更多的冠折。
