Peri-implant bone resorption risk of anterior maxilla narrow single implants: a finite-element analysis

Figures & data

Figure 1. Finite-element model descriptions: geometry (mm), mesh, boundary conditions (fixed nodes), and occlusal loading (N: newton). L: implant length, $\mathrm{\varnothing }$: implant diameter, BBT: buccal bone thickness, ROI: region of interest (only the mesial ROI is visible in the image, but distal ROI was also used to calculate the peri-implant bone resorption risk indexes).

Table 1. Simulated dental implant geometries.

Model	Implant diameter (mm)	Implant Length (mm)	Bone-implant interface area (mm^2)	Remained buccal bone thickness (mm)
Ø3.25L10	3.25	10	115.45	2.000
Ø3.25L13	3.25	13	159.21
Ø3.50L10	3.50	10	127.73	1.875
Ø3.50L13	3.50	13	176.52
Ø3.75L10	3.75	10	140.54	1.750
Ø3.75L13	3.75	13	194.60
Ø4.00L10	4.00	10	153.88	1.625
Ø4.00L13	4.00	13	213.47

Table 2. Materials properties.

Material	Elastic modulus (GPa)	Poisson coefficient
Cortical bone	13.7	0.3
Trabecular bone	1.37	0.3
Dental implant (titanium)	113	0.3
Abutment	113	0.3
Lithium disilicate (crown)	95	0.3

Figure 2. Frost’s mechanostat windows based on the bone density change $\mathrm{ }\left(\frac{\Delta \rho }{\rho }\right)$ as a function of the mechanical stimulus. Sp: mechanical stimulus that drives the bone into pathologic resorption window. SED: strain energy density (in µJ/mm³). ε: strain (in µstrain = 1 µm/m). ρ: bone density. Δρ: bone density variation.

Figure 3. Strain energy density (SED) distribution and mean of top 10 SED for cortical and trabecular buccal bone. A: using the same color range adjustment for cortical and trabecular bone. B: using specific color range adjustments for cortical and trabecular bone, according to each bone SED pathologic resorption limit (Sp) value (109.6 µJ/mm³ for cortical and 10.96 µJ/mm³ for trabecular bone).

Figure 4. Peri-implant bone resorption risk index (PIBR_ri) for cortical and trabecular bones.