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All Journal Mechanical Engineering for Society and Industry Jurnal Pendidikan Teknik Mesin
Jamari
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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COMPARATIVE BIOMECHANICAL ANALYSIS OF POSTERIOR MANDIBULAR PREMOLAR IMPLANTS: EFFECTS OF MATERIAL MODELING, CONTACT CONDITIONS, AND LOADING DIRECTION Dennis Andhara Putra; Kriswanto; Khoirul Huda; Jamari; Athanasius Priharyoto Bayuseno; Dhiaulhaque; Nurul Fatulloh; Mohd Syahmi Jamaludin
Jurnal Pendidikan Teknik Mesin Vol. 26 No. 01 (2026): June 2026 "Special issues for finite element analysis"
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v26i01.54363

Abstract

Posterior tooth loss in the mandibular region may reduce masticatory performance and compromise biomechanical stability, thereby requiring predictable and well-designed implant rehabilitation strategies. This study evaluates the mechanical behavior of an implant–bone system by considering variations in bone material representation (isotropic and orthotropic models), implant–bone interface conditions (fully bonded and frictional contact), and loading orientations (axial and oblique) through a validated three-dimensional finite element analysis (3D-FEA) framework. A full factorial design comprising eight simulation configurations was implemented to assess 15 biomechanical output parameters, including von Mises stress, principal strain, and displacement across implant components and surrounding cortical and cancellous bone tissues. The results indicate that the biomechanical response of the system is strongly dependent on both structural components and loading context. The orthotropic bone model tends to increase stress and deformation responses under specific conditions, whereas oblique loading generally produces higher peak mechanical responses than axial loading. Furthermore, the influence of contact conditions is not uniform but varies according to material assumptions and loading direction, suggesting that simplified fully bonded interfaces may not fully capture realistic implant–bone interactions. Overall, the findings highlight the importance of incorporating anisotropic bone behavior, realistic interface modeling, and clinically relevant loading directions to improve the accuracy of stress prediction around dental implants. This study provides numerical evidence that may support improved implant design strategies and enhance the reliability of future finite element–based biomechanical investigations. 
Finite element analysis of L4-S1 intervertebral disc stress during ruku’ posture in islamic prayer movements Kurdi, Ojo; Febriyanto, Kusuma; Wicaksono, Hasyid Ahmad; Winarni, Tri Indah; Jamari
Mechanical Engineering for Society and Industry Vol. 6 No. 2 (2026): Issue in Progress
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.14467

Abstract

Bowing movement (ruku') in Islamic prayer requires repeated spinal flexion, which may impose mechanical stress on the spinal structures, particularly in lumbar region. This risk is potentially aggravated in individuals with spinal disorders such as disc degeneration or Hernia Nucleus Pulposus (HNP). Although ruku' posture is a routine daily activity among Muslims, biomechanical investigations into stress distribution during this posture remain limited. This study used finite element model (FEM) to examine von Mises stress distribution in intervertebral disc (IVD) at L4/L5 and L5/S1 levels during flexion movements from 0° to 90°. The geometric model was generated from a CT scan of a 55-year-old male patient. The simulation was conducted under an axial load of 500 N, which was resolved in accordance with the flexion angle's direction. The spinal structure was designed to include the cortical bone, cancellous bone, annulus fibrosus (AF), nucleus pulposus (NP), and related ligaments. The results showed that an increase in the flexion angle led to a substantial accumulation of stress, specifically inside AF and NP. L5/S1 segment demonstrated the greatest stress levels, with distribution mostly focused in the anterior portion of the disc. The highest stress in L5/S1 AF escalated over five times at 90° flexion relative to the upright posture. This pattern indicates a possible posterior displacement of NP, which may theoretically increase the biomechanical risk factors associated with disc herniation over time. Repetitive and intense bowing movements (ruku') can exert significant mechanical stress on the lower lumbar spine, specifically at L5/S1 segment. These results underscore the significance of biomechanical comprehension in religious activities and provide a foundational numerical framework to inform future musculoskeletal investigations regarding postural safety.
Co-Authors Athanasius Priharyoto Bayuseno Dennis Andhara Putra Dhiaulhaque Febriyanto, Kusuma Khoirul Huda Kriswanto Mohd Syahmi Jamaludin Nurul Fatulloh Ojo Kurdi Tri Indah Winarni Wicaksono, Hasyid Ahmad