Effect of bone mass density and alveolar bone resorption on stress in implant restoration of free-end edentulous posterior mandible: Finite element analysis of double-factor sensitivity.
Ann Anat
; 253: 152210, 2024 Apr.
Article
em En
| MEDLINE
| ID: mdl-38244942
ABSTRACT
BACKGROUND:
Osseous condition of the mandible was regarded as a key factor influencing stability of implants in the early stage. Finite element analysis was used to assess the effect of bone mass density and alveolar bone resorption (double factors) on stress in a four-unit implant restoration of a free-end edentulous posterior mandible.METHODS:
A 3D finite element model was constructed for a single-sided free-end edentulous mandible (from mandibular first premolar to mandibular second molar) containing threaded dental implants. Mandible sensitivity modes were constructed with different alveolar bone resorption levels for normal conditions as well as mild, moderate and severe periodontitis, respectively. Based on the mass density of cancellous bone for four types of bones as the sensitivity parameter, two implant design modes were constructed Model A (four-unit fixed bridge supported by three implants, implant positions were 34, 36 and 37) and model B 34 × 36, 37 (37 a single implant crown) (34 × 36 three-unit fixed bridge supported by two implants, implant positions were 34 and 36). A total of 32 sensitivity-based finite element models, grouped in two groups, were constructed. Stress distribution and maximum von Mises stress on cortical bone and cancellous bone around the implant, as well as the surface of implant were investigated by using ABAQUS when vertical loading and 45° oblique loading were applied, respectively.RESULTS:
When vertical loading was applied on the implant, maximum von Mises stress on the cortical bone around the implant was assessed to be 4.726â¯MPa - 13.15â¯MPa and 6.254â¯MPa - 13.79â¯MPa for groups A and B, respectively; maximum stress on the cancellous bone around the implant was 2.641â¯MPa - 3.773â¯MPa and 2.864â¯MPa - 4.605â¯MPa, respectively; maximum stress on the surface of implant was 14.7â¯MPa - 21.17â¯MPa and 21.64â¯MPa - 30.70â¯MPa, respectively. When 45° oblique loading was applied on the implant restoration, maximum von Mises stress on the cortical bone around the implant was assessed to be 42.08â¯MPa - 92.71â¯MPa and 50.84â¯MPa - 102.5â¯MPa for groups A and B, respectively; maximum stress on the cancellous bone around the implant was 4.88â¯MPa - 25.95â¯MPa and 5.227â¯MPa - 28.43â¯MPa, respectively; maximum stress on the surface of implant was 77.91â¯MPa - 124.8â¯MPa and 109.2â¯MPa - 150.7â¯MPa, respectively. Stress peak on the cortical bone and that on cancellous bone around the implant increased and decreased with the decrease in bone mass density, respectively. Stress peak on alveolar bone increased with alveolar bone resorption when oblique loading was applied.CONCLUSION:
1. Both alveolar bone resorption and bone mass density (double factors) are critical to implant restoration. Bone mass density may exhibit a more pronounced impact than alveolar bone resorption. 2. From the biomechanical perspective, types I and II bones are preferred for implant restoration, while implantation should be considered carefully in the case of type III bones, or those with less bone mass density accompanied by moderate to severe alveolar bone loss. 3. Splinting crowns restoration is biomechanically superior to single crown restoration.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Implantes Dentários
/
Perda do Osso Alveolar
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Ann Anat
Assunto da revista:
ANATOMIA
Ano de publicação:
2024
Tipo de documento:
Article