title: Influence of thread pitch, helix angle, and compactness on micromotion of immediately loaded implants in three types of bone quality: a three-dimensional finite element analysis.
abstract: This study investigated the influence of thread pitch, helix angle, and compactness on micromotion in immediately loaded implants in bone of varying density (D2, D3, and D4). Five models of the three-dimensional finite element (0.8 mm pitch, 1.6 mm pitch, 2.4 mm pitch, double-threaded, and triple-threaded implants) in three types of bone were created using Pro/E, Hypermesh, and ABAQUS software. The study had three groups: Group 1, different pitches (Pitch Group); Group 2, same compactness but different helix angles (Angle Group); and Group 3, same helix angle but different compactness (Compact Group). Implant micromotion was assessed as the comprehensive relative displacement. We found that vertical relative displacement was affected by thread pitch, helix angle, and compactness. Under vertical loading, displacement was positively correlated with thread pitch and helix angle but negatively with compactness. Under horizontal loading in D2, the influence of pitch, helix angle, and compactness on implant stability was limited; however, in D3 and D4, the influence of pitch, helix angle, and compactness on implant stability is increased. The additional evidence was provided that trabecular bone density has less effect on implant micromotion than cortical bone thickness. Bone type amplifies the influence of thread pattern on displacement.
authors.affiliation: Department of Oral Implantology, Beijing Stomatological Hospital of Capital Medical University, Beijing 100050, China ; Department of Oral Implantology, School of Stomatology, State Key Laboratory of Military Stomatology, The Fourth Military Medical University, Xi'an, Shanxi 710032, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Ma
authors.affiliation: Clinical Aviation Medicine Center of PLA, Air Force General Hospital, Beijing 100142, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xiong
authors.affiliation: Department of Oral Implantology, Beijing Stomatological Hospital of Capital Medical University, Beijing 100050, China.
authors.forename: Baosheng
authors.initials: B
authors.lastname: Tan
authors.affiliation: Department of Oral Implantology, Beijing Stomatological Hospital of Capital Medical University, Beijing 100050, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Geng
authors.affiliation: Department of Oral and Cranio-Maxillofacial, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors.forename: Jiaqiang
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Basic Medical Science, Capital Medical University, Beijing 100069, China.
authors.forename: Weihong
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Oral Implantology, School of Stomatology, State Key Laboratory of Military Stomatology, The Fourth Military Medical University, Xi'an, Shanxi 710032, China.
authors.forename: Dehua
authors.initials: D
authors.lastname: Li
mesh_terms: D015519:Bone Density; D001842:Bone and Bones / Q000000981:diagnostic imaging*; D003198:Computer Simulation; D015921:Dental Implants; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D016348:Osseointegration; D011859:Radiography; D012984:Software; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants
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