BACKGROUND The purpose of this prospective clinical study was to evaluate clinical results of the passive fit of the substructure in the Toronto bridge and the chipping or delamination of the ceramic veneering on the zirconia-support, after 5 years, in nine patients rehabilitated with zirconia crowns cemented on titanium bars using CAD/CAM technology. METHODS A total of nine healthy patient fully edentulous in the upper and lower jaws with non-contributory past medical anamnesis needing full fixed total prosthesis maxilla and mandible were included in this clinical study, where a total 9 mandibles and 9 jaws were treated. The inclusion criteria in order for a patient to participate in the study were: a signed consent form, fully edentulous in the upper and lower jaws, required a full fixed total prosthesis restoration. The exclusion criteria were age limitation of less than 18 years old, chemotherapy, head and neck radiation therapy, diabetes or periodontal disease, smoking and severe illness. All patients received zirconia crowns cemented on titanium bars using CAD/CAM technology. The primary outcome of this study was to examine the survival rate of the zirconia crowns cemented on titanium bars using CAD/CAM technology during the observation period. Any chipping or delamination of the zirconia crowns of the restorations was considered as failure. The secondary outcome was to evaluate the passive fit of the substructure on the implants, loose of occlusal screws, implant survival and satisfactory occlusion. RESULTS In 5 years of follow-up no evidence of chipping or delamination of the ceramic veneering on the zirconia crown supported were observed. Fifteen finished protesis (93.75%) showed satisfactory occlusion and only one case (6.25%) required significant occlusal adjustment. During the first year recall all bars were stable (100%) no mobility of protheses was recorded. After 5 years all bars were stable (100%) and no mobility of protheses was recorded. CONCLUSION The computerized workflow for the process of building bar and prosthesis ensures reproducible results and excellent adaptation and passive insertion of them, as well as conditions for avoiding mechanical complications and guarantees stability of screw-implant abutments.

中文翻译：

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使用CAD / CAM将氧化锆冠粘接在钛棒上：对9位患者进行的为期五年的前瞻性临床研究。

背景技术这项前瞻性临床研究的目的是评估9例经过氧化锆冠修复的患者在5年后多伦多桥下部结构的被动配合以及氧化锆支架上陶瓷饰面的崩裂或分层的临床结果。使用CAD / CAM技术将其固定在钛棒上。方法这项临床研究共纳入9例健康的上颌和下颌完全无牙病患者，且既往无医疗性回忆，需要上颌骨和下颌骨完全固定，共治疗9例下颌骨和9例下颌骨。为了使患者参与研究，纳入标准为：签署的同意书，上下颌完全无牙，需要完全固定的修复体。排除标准为年龄限制在18岁以下，化学疗法，头颈放射疗法，糖尿病或牙周疾病，吸烟和严重疾病。所有患者均使用CAD / CAM技术在钛棒上粘合了氧化锆冠。这项研究的主要结果是在观察期内使用CAD / CAM技术检查了钛棒上胶结的氧化锆冠的存活率。修复体的氧化锆冠的任何碎裂或分层都被认为是失败的。次要结果是评估亚结构在植入物上的被动配合，松动的咬合螺钉，植入物的存活率和令人满意的咬合。结果在5年的随访中，没有观察到支撑的氧化锆冠上的陶瓷饰面破裂或分层的迹象。十五个完成的蛋白质（93.75％）显示出令人满意的咬合，只有一例（6.25％）需要显着的咬合调整。在第一年的召回中，所有条形都是稳定的（100％），没有记录到假肢的活动性。5年后，所有钢筋均稳定（100％），且未记录假体的活动性。结论钢筋和假体加工过程的计算机化工作流程可确保可再现的结果，出色的适应性和被动插入性，以及避免机械并发症的条件，并确保螺钉-种植体基台的稳定性。5年后，所有钢筋均稳定（100％），且未记录假体的活动性。结论钢筋和假体加工过程的计算机化工作流程可确保可再现的结果，出色的适应性和被动插入性，以及避免机械并发症的条件，并确保螺钉-种植体基台的稳定性。5年后，所有钢筋均稳定（100％），且未记录假体的活动性。结论钢筋和假体加工过程的计算机化工作流程可确保可再现的结果，出色的适应性和被动插入性，以及避免机械并发症的条件，并确保螺钉-种植体基台的稳定性。