Objective: To assess the biomechanical effects of different prosthetic/implant configurations and load directions on 3-unit fixed prostheses supported by short dental implants in the posterior mandible using validated 3-D finite element (FE) models.
Methods: Models represented an atrophic mandible, missing the 2nd premolar, 1st and 2nd molars, and rehabilitated with either two short implants (implant length-IL = 8 mm and 4 mm) supporting a 3-unit dental bridge or three short implants (IL = 8 mm, 6 mm and 4 mm) supporting zirconia prosthesis in splinted or single crowns design. Load simulations were performed in ABAQUS (Dassault Systèmes, France) under axial and oblique (30°) force of 100 N to assess the global stiffness and forces within the implant prosthesis. Local stresses within implant/prosthesis system and strain energy density (SED) within surrounding bone were determined and compared between configurations.
Results: The global stiffness was around 1.5 times higher in splinted configurations vs. single crowns, whereby off-axis loading lead to a decrease of 39%. Splinted prostheses exhibited a better stress distribution than single crowns. Local stresses were larger and distributed over a larger area under oblique loads compared to axial load direction. The forces on each implant in the 2-implant-splinted configurations increased by 25% compared to splinted crowns on 3 implants. Loading of un-splinted configurations resulted in increased local SED magnitude.
Conclusion: Splinting of adjacent short implants in posterior mandible by the prosthetic restoration has a profound effect on the magnitude and distribution of the local stress peaks in peri-implant regions. Replacing each missing tooth with an implant is recommended, whenever bone supply and costs permit.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8837704 | PMC |
| http://dx.doi.org/10.1186/s40729-022-00404-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Skeletal, Dental, and Soft Tissue Changes after Slow Maxillary Expansion in Early Mixed Dentition.
Turk J Orthod
December 2024
Karadeniz Technical University Faculty of Dentistry, Department of Orthodontics, Trabzon, Turkey.
Objective: This study aimed to evaluate the skeletal, dental, and soft tissue effects of the nickel titanium memory Leaf Expander in a growing sample of patients with unilateral posterior crossbite compared with a control group using digital models and lateral cephalometric radiographs.
Methods: The research included a total of 24 patients, 12 of whom were treated and 12 untreated. The Leaf Expander group consisted of 4 males and 8 females (mean age= 8.
Minimal Access Retromandibular Approach to Fractures of Vertical Segment of the Mandible: A Versatile Technique.
Indian J Plast Surg
December 2024
Department of Plastic and Reconstructive Surgery, Lokmanya Tilak Municipal Medical College and General Hospital, Mumbai, Maharashtra, India.
Fractures of the condylar region of the mandible, although fairly common, also generate the most debate regarding management-both closed and open treatment options have been recommended and shown to yield good results. We present our experience with a minimal access retromandibular approach to fractures of the vertical mandible. This is a retrospective study of all patients who underwent open reduction and internal fixation for fractures of the vertical mandible (condyle, subcondylar region, ramus) using a retromandibular approach at a tertiary care hospital in a metropolitan city in India between January 2022 and July 2023.
View Article and Find Full Text PDFFinite element analysis on implant-supported bar with different geometric shapes.
BMC Oral Health
December 2024
Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand.
Background: The selection guideline for the implant-supported bar connectors (ISBC) of hybrid denture is lacking. This study investigated the maximum von Mises stress (vMS), stress distribution, and displacement of various geometric ISBC in mandibular hybrid dentures, as well as the maximum principal stress (σmax) in the acrylic resin part, through finite element analysis.
Methods: Four different geometric cross-sectional patterns for mandibular ISBC-L, Y, I, and Square-of equal volume, based on the "All-on-4" concept, were created.
Jaw Growth and Development in Class II Division I Malocclusion Children Using the Myobrace® Muscle Function Appliance.
Ann Ital Chir
December 2024
Department of Orthodontics, Dental Disease Prevention and Treatment Institute of Huangpu District, 200002 Shanghai, China.
Aim: Class II Division I malocclusion is common in pediatric orthodontics, and is often associated with malocclusion and poor muscle functionality. However, research on post-treatment changes in maxillomandibular dimensions, excluding normal development influences, is limited. Therefore, this study aimed to investigate the effects of Myobrace® appliance and targeted muscle functional training on maxillomandibular dimensions in children with Class II Division I malocclusion, compared to directed oral muscle training alone.
View Article and Find Full Text PDFGuided Bone Regeneration in the Posterior Mandible Using a Resorbable Metal Magnesium Membrane and Fixation Screws: A Case Report.
Case Rep Dent
December 2024
Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorder, Charité-Universitätsmedizin Berlin, Aßmannshauser Straße 4-6 14197, Berlin, Germany.
Due to bone loss, implant placement in the posterior mandible is often impossible without prior augentative procedures. The reconstruction of bone defects with horizontal and vertical components using particulated bone grafts requires the placement of a mechanically stable structure for stabilization of the grafting material. Although titanium-reinforced membranes and titanium meshes have been shown to be effective in this indication, the necessity of their removal, often in a separate surgical procedure, is seen as a disadvantage.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!