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首页> 外文期刊>The International journal of prosthodontics >Survival of ceramic computer-aided design/manufacturing crowns bonded to preparations with reduced macroretention geometry.
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Survival of ceramic computer-aided design/manufacturing crowns bonded to preparations with reduced macroretention geometry.

机译：陶瓷计算机辅助设计/制造牙冠的存活率降低了与宏观保持几何形状相关的制剂。

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PURPOSE: Adhesive cementation reduces the need for macroretentive preparation for crowns. This study investigated the survival and clinical rating of monolithic computer-aided design/manufacturing (CAD/CAM) ceramic crowns bonded to preparations with reduced macroretention, hypothesizing that adhesion would compensate for reduced retention geometry. MATERIALS AND METHODS: Two-hundred eight posterior CAD/CAM-generated crowns from feldspar block ceramic were adhesively bonded in 136 patients in three preparation groups: classic (100% stump height, n = 70); reduced (reduced stump height or irregular stump, n = 52); and endo (absent stump but pulp chamber retention cavity, n = 86). Crowns were examined at baseline and after 55 +/- 15 months using modified USPHS criteria. Plaque and bleeding of gingiva around the crowns were assessed. RESULTS: Cumulative Kaplan-Meier survival of crowns on premolars/molars was: classic = 97.0%/94.6%; reduced = 92.9%/92.1%; and endo = 68.8%/87.1%, confirming the hypothesis forclassic, reduced, and endo molars as well as for classic and reduced premolars. A significant difference was found between classic and endo premolar crowns, rejecting the hypothesis for endo preparation on premolars. Plaque and bleeding indices were significantly lower for crowned teeth than for controls. CONCLUSION: The survival of classic and reduced crowns was rated adequate for premolars and molars. Endo preparation appeared acceptable for molar crowns but inadequate for premolar crowns.
机译：用途：胶粘剂胶结减少了对牙冠进行宏观保持性制备的需要。这项研究调查了粘合到具有较低宏观保留的制剂上的单片计算机辅助设计/制造（CAD / CAM）陶瓷冠的存活率和临床等级，假设粘合力可以补偿减少的保留几何形状。材料与方法：用长石块状陶瓷将280个后冠CAD / CAM产生的牙冠粘结在三个准备组的136例患者中：经典组（100％树桩高度，n = 70）;降低（降低的树桩高度或不规则的树桩，n = 52）;内壁（没有树桩，但果肉腔保留腔，n = 86）。在基线和55 +/- 15个月后使用修改后的USPHS标准检查牙冠。评估牙冠周围的牙菌斑和出血情况。结果：前磨牙/磨牙的牙冠累积Kaplan-Meier存活率为：经典= 97.0％/ 94.6％;减少= 92.9％/ 92.1％;内磨牙= 68.8％/ 87.1％，证实了经典磨牙，减少磨牙和内磨牙以及经典磨牙和减少前磨牙的假说。发现经典和前磨牙前牙冠之间存在显着差异，从而拒绝了在前磨牙上进行内牙准备的假设。冠状牙齿的牙菌斑和出血指数显着低于对照组。结论：对于经典的磨牙和磨牙来说，经典牙冠和还原型牙冠的存活率被评定为足够。内膜制备对于磨牙冠似乎是可以接受的，但对于磨牙前冠则不足。

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