Finite Element Analysis of effect of cusp inclination and occlusal contacts in PFM and PEEK implant-supported crowns on resultant stresses |
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| Institution: | 1. Assistant Professor (Prosthodontics), Government Dental College & Hospital, Hyderabad, Telangana, India;2. Professor & Head (Prosthodontics), Government Dental College and Hospital, Hyderabad, Telangana, India;1. Resident, Department of Surgery, Armed Forces Medical College, Pune, 411040, India;2. Senior Advisor (Surgery & Pediatric Surgery), Command Hospital (Southern Command), Pune, 411040, India;3. Classified Specialist (Surgery & Pediatric Surgery), Command Hospital (Southern Command), Pune, 411040, India;4. Senior Advisor (Anaesthesia & Pediatric Anaesthesia), Command Hospital (Southern Command), Pune, 411040, India;1. Classified Specialist (Anaesthesiology), Cardiothoracic & Vascular Anaesthesiology, Sree Chitra Tirunal Institute for Medical Sciences, Trivandrum, Kerala 695011, India;2. Classified Specialist (Anaesthesiology), Paediatric Anaesthesiology, Seth G.S. Medical College & K.E.M. Hospital, Mumbai, India;3. Brig AFMS (P&T), O/o DGAFMS, MoD, New Delhi, India;4. Consultant & Head (Anaesthesiology), Base Hospital, Delhi Cantt, India;5. Associate Professor (Physiology), Chattisgarh Institute of Medical Sciences, Bilaspur, Chattisgarh, India;6. Associate Professor (Community Medicine), Chettinad Hospital and Research Institute, Chennai, India;1. Graded Specialist (Pharmacology), Armed Forces Medical Stores Depot, Lucknow, India;2. Senior Advisor & Head (Psychiatry), Base Hospital, Delhi Cantt, India;3. Graded Specialist (Psychiatry), Base Hospital, Delhi Cantt, India;4. Tutor (Pharmacology), Army College of Medical Sciences, Delhi Cantt, New Delhi, India;5. Associate Professor (Pharmacology), Army College of Medical Sciences, Delhi Cantt, New Delhi, India;1. Classified Specialist (Pathology), 151 Base Hospital, Guwahati, Assam, India;2. Graded Specialist (Psychiatry), 151 Base Hospital, Guwahati, Assam, India;3. Senior Advisor (Path & Micro), Command Hospital (Eastern Command), Kolkata, India;4. Classified Specialist (Psychiatry), Command Hospital (Eastern Command), Kolkata, India;1. Section of Clinical Biochemistry, University of Verona, Verona, Italy;2. The Heart Institute, Cincinnati Children''s Hospital Medical Center, Cincinnati, OH, USA |
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| Abstract: | BackgroundEffect of prosthesis design on occlusal overload and long-term implant stability cannot be overstated. In Porcelain Fused to Metal (PFM) crowns, low cusp inclination and occlusal contacts limited to central fossa ensure axially directed forces on an implant but often pose esthetic and functional challenges. It is theorized that resilient Polyetheretherketone (PEEK) crowns have shock absorption capacity for favorable stress distribution. This study compared two implant crown materials and evaluated the effect of cusp inclination and occlusal contact distribution on resultant stresses.MethodsThirty 3D finite element models of implant-supported PFM and PEEK crowns, generated using Solidedge 3D CAD solid modeling software (v19, Siemens PLM Software Inc.,US), were used to study the effect of 3 cups inclinations (0°, 15°, 30°) under five load conditions, with 300N force distributed over one, two, or three contact areas and exported to ANSYS (v18.1, ANSYS Inc. Pennsylvania, US) for stress analysis.ResultsMaximum stress in both PFM and PEEK models was at the neck of the implant under Load 3(300N distributed over three contact areas: central fossa, buccal cusp tip, marginal ridge). Minimum stress in all models was under Load 1(300N applied at one contact area in central fossa). Maximum stresses were recorded for 30° cusp inclination in PFM models.ConclusionIn both PFM and PEEK crown models, contact areas placed away from the implant axis generated greater implant and peri-implant stresses and had more effect on resultant stresses than that of increase in cusp inclination. The effect of cusp inclination on the resultant stresses was dependent on the crown material. |
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| Keywords: | Dental stress analysis Finite element analysis Dental implant Dental occlusion Porcelain-metal Polyetheretherketone |
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