新型3D打印无牙颌种植临时固定义齿在不同方向上受力的有限元分析OA

Objective This study aimed to investigate the biomechanical properties of a novel 3D-printed temporary fixed denture for edentulous jaws using finite element analysis,and to compare its mechanical performance with that of conventional non-3D-printed polyetheretherketone(PEEK)and 3D-printed polylactic acid(PLA).Methods A three-dimensional finite element model of a mandible with complete edentulism was established based on a patient treated with an implant-supported temporary fixed prosthesis at Hangzhou Stomatological Hospital(Pinghai Campus)in May 2024.Three materials were analyzed:polyetheretherketone(PEEK,A1),polylactic acid(PLA,A2),and 3D-printed light-curing temporary crown and bridge resin for additive manufacturing(A3).A static load of 150 N was applied to anterior and posterior crowns and bridges in eight different directions:vertical load on posterior teeth(G1),right posterior buccal-to-lingual load(G2),right posterior lingual-to-buccal load(G3),left posterior buccal-to-lingual load(G4),left posterior lingual-to-buccal load(G5),vertical load on anterior teeth(G6),anterior labial-to-lingual load(G7),and anterior lingual-to-labial load(G8).Finite element analyses were performed using ANSYS 2021 R1 to evaluate the maximum Von Mises stress(MPa),maximum total deformation(mm),maximum Von Mises strain(mm),and stress distribution maps for each material.Results ①The maximum Von Mises stress of A1(PEEK)was lower than A2(PLA)in all directions,and A3 exhibited lower Von Mises stress than A2 in five directions.② A3 demonstrated lower maximum total deformation and Von Mises strain than A1 and A2 in seven directions;however,in direction G6(vertical load on anterior teeth),A3 exhibited the largest total deformation and Von Mises strain.③ For anterior loading,the greatest deformation was concentrated at the incisal edge,with Von Mises strain evenly distributed across the anterior teeth and stress concentrated around the connector of the prosthesis.④ For posterior loading,the greatest deformation was located at the distal margin of the mandibular second molar,with relatively uniform strain distribution in posterior regions,and peak stress located at the implant-abutment connection.Conclusion The novel 3D-printed temporary fixed denture for edentulous jaws demonstrated partially superior mechanical properties compared to both PEEK and PLA materials under simulated functional loading.