Rauch Angelika, Heinzmann Wendy, Rosentritt Martin, Hahnel Sebastian, Schmidt Michael Benno, Fuchs Florian, Koenig Andreas
Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany.
Zahnärzte im Leipziger Westen, Karl-Heine-Straße 26, 04229 Leipzig, Germany.
J Clin Med. 2023 Sep 15;12(18):5997. doi: 10.3390/jcm12185997.
Chipping of implant-supported molar crowns (iSCs) is a frequently reported complication. This study aimed to investigate the in-vitro aging and fracture resistance of iSCs with a CAD/CAM resin composite veneer structure fabricated with the Rapid Layer Technology (RLT) approach. Eight iSCs per group were fabricated by using two different CAD/CAM resin composites (Shofu Block HC: SH; Grandio blocs: GB) for veneer structures, and zirconia (ZrO), polyetheretherketone (PEEK), and cobalt-chromium (CoCr; control) as framework materials. The surfaces to be bonded were sandblasted, cleaned in an ultrasonic bath, and a coupling agent was applied. A self-adhesive resin luting composite was used to adhesively lute the veneer structures to the frameworks. The crowns were semi-permanently cemented to the abutments. After storage in deionized water, iSCs were loaded in a chewing simulator (TCML, 10,000 thermal cycles 5 °C to 55 °C for 20 s, 1.2 million, loading force 50 N). Four ZrO and one CoCr crown did not survive the TCML. The fracture force was determined after 24 h storage in deionized water and yielded values of ≥974 N. Lowest fracture forces were yielded in the PEEK-SH group in comparison to CoCr or ZrO groups ( ≤ 0.031). For identical framework materials, no significant influence of the veneering material was observed. All PEEK-GB frameworks fractured, and chipping occurred for ZrO-SH and all CoCr frameworks. PEEK-SH and ZrO-GB presented both chipping and framework fractures. Within the limitations of this in-vitro study, the RLT with a CAD/CAM resin composite veneer structure might be a promising approach to veneer iSCs. Yet, the choice of the CAD/CAM resin composite and of the framework material determine the fracture resistance.
种植体支持的磨牙冠（iSCs）崩瓷是一种常见的并发症。本研究旨在调查采用快速层技术（RLT）制作的具有CAD/CAM树脂复合材料贴面结构的iSCs的体外老化和抗折性能。每组使用两种不同的CAD/CAM树脂复合材料（松风Block HC：SH；格兰迪欧块材：GB）制作贴面结构，并使用氧化锆（ZrO）、聚醚醚酮（PEEK）和钴铬合金（CoCr；对照）作为框架材料，每组制作8个iSCs。对要粘结的表面进行喷砂处理，在超声浴中清洗，并施加偶联剂。使用自粘结树脂粘结复合材料将贴面结构粘结到框架上。将牙冠半永久性粘结到基台上。在去离子水中储存后，将iSCs加载到咀嚼模拟器中（TCML，10000次热循环，5℃至55℃，持续20秒，120万次，加载力50N）。4个ZrO和1个CoCr牙冠在TCML测试中未通过。在去离子水中储存24小时后测定断裂力，得到的值≥974N。与CoCr或ZrO组相比，PEEK-SH组的断裂力最低（≤0.031）。对于相同的框架材料，未观察到贴面材料的显著影响。所有PEEK-GB框架均发生断裂，ZrO-SH和所有CoCr框架均出现崩瓷。PEEK-SH和ZrO-GB均出现崩瓷和框架断裂。在本体外研究的局限性内，采用CAD/CAM树脂复合材料贴面结构的RLT可能是一种有前景的iSCs贴面方法。然而，CAD/CAM树脂复合材料和框架材料的选择决定了抗折性能。
