Methods : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
An artificial mandibular bone (P9-X.1135, Nissin Dental Products, Kyoto, Japan) with free-end edentulism of the left mandibular first premolar (no. 34), second premolar (no. 35), and first molar (no. 36) was used (Figure 1). The model is composed of a two-layer structure of artificial cortical bone (urethane resin) and artificial cancellous bone (urethane resin foam).
Using the anatomical crown width diameter as a reference [16], we embedded three implants. The distance between the second premolar and mandibular first premolar implants was 8 mm. The distance between the first molar and second premolar implants was 10 mm.
An implant placement guide (Landmark Guide™, iCAT, Osaka, Japan) was fabricated to precisely embed the implants in the artificial mandible. A drilling machine (Enkoh’s, Enshu Industrial, Shizuoka, Japan) and implant placement guide were used to embed the implants perpendicular to the bottom surface of the artificial mandible. A drill to form implant cavities (Brånemark System® Twist Drills, Nobel Biocare, Göteborg, Sweden) was mounted onto the drilling machine, and three implant cavities 3.0 mm in diameter and 10 mm in depth were formed. Then, in each of the implant cavities, an implant 3.75 mm in diameter and 10 mm in length (Brånemark System® Mk III, Nobel Biocare, Göteborg, Sweden) was embedded using 40 N · cm of torque (Figure 2).
Using the anatomical crown width as a reference [16], it was determined that the occlusal surface view of the superstructure would be trapezoidal with a 7-mm buccolingual width in the mesial first premolar section, a 10-mm buccolingual width in the distal first molar section, and a 26-mm mesiodistal width (Figure 3). The vertical dimension was 8 mm; the upper 4 mm was the thickness of the superstructure and the lower 4 mm was the abutment connection. Three loading points 2 mm in diameter and 0.2 mm in depth were applied to the occlusal surface of the first molar; these formed the buccal loading point (Figure 3a), central loading point (Figure 3b), and lingual loading point (Figure 3c). The superstructure was made of titanium (ISUS, DENTSPLY Sankin, Tokyo, Japan) and fabricated using computer-aided design/computer-aided manufacturing (CAD/CAM). Three experimental models were fabricated where the superstructure was mounted onto an implant-embedded artificial mandible.
Serial posts:
- Abstract : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Background : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
- Background : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [2]
- Methods : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
- Methods : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [2]
- Methods : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [3]
- Methods : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [4]
- Results : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
- Results : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [2]
- Results : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [3]
- Discussion : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
- Discussion : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [2]
- Discussion : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [3]
- Discussion : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [4]
- Discussion : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [5]
- Conclusions : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Abbreviations : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- References : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [1]
- References : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [2]
- References : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [3]
- References : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model [4]
- Acknowledgements : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Author information : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Additional information : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
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- About this article : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 1 Mechanical properties of the materials used in the FEA : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 2 Coefficients of variation in implant displacement under loading conditions : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 3 Three-way ANOVA (displacement in the buccolingual direction [x-axis]) : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 4 Three-way ANOVA (displacement in the mesiodistal direction [y-axis]) : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 5 Three-way ANOVA (displacement in the inferior-superior direction [z-axis]) : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 6 Three-way ANOVA (equivalent stress) : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Table 7 Coefficients of variation for equivalent stresses : A biomechanical investigation of mandibular molar implants: reproducibility and validity of a finite element analysis model
- Figure 1. An artificial mandible. : A biomechanical investigation of mandibular molar implant
- Figure 2. Three implants were embedded in an artificial mandible. : A biomechanical investigation of mandibular molar implant
- Figure 3. An experimental model. (a) Buccal loading, (b) central loading, and (c) lingual loading are shown. : A biomechanical investigation of mandibular molar implant
- Figure 4. An experimental model loading test. : A biomechanical investigation of mandibular molar implant
- Figure 5. An FEA model. (a) Buccal loading, (b) central loading, and (c) lingual loading are shown. : A biomechanical investigation of mandibular molar implant
- Figure 6. Implant displacement under loading conditions. : A biomechanical investigation of mandibular molar implant
- Figure 7. The displacement of the three implants. (M) Mesial side, (D) Distal side, (B) Buccal side, and (L) Lingual side are shown. : A biomechanical investigation of mandibular molar implant
- Figure 8. Displacement in the buccolingual direction (x-axis). (a) The contact model and (b) the fixation model. : A biomechanical investigation of mandibular molar implant
- Figure 9. Displacement in the mesiodistal direction (y-axis). (a) The contact model and (b) the fixation model. : A biomechanical investigation of mandibular molar implant
- Figure 10. Displacement in the inferior-superior direction (z-axis). (a) The contact model and (b) the fixation model. : A biomechanical investigation of mandibular molar implant
- Figure 11. The distribution of equivalent stress (MPa) around the first molar. : A biomechanical investigation of mandibular molar implant
- Figure 12. Equivalent stresses at (a) the neck and (b) the tip of the implant. : A biomechanical investigation of mandibular molar implant