Within the scope of this experimental study, quantitative data of load distribution of
denture, implant, alveolar ridge and mucosa were obtained when different implant
distribution locations. The following conclusions are drawn from the results of this study:
1. The maximum stress of cortical bone, cancellous bone and mucous under the functional
load of traditional longitudinal partial denture is concentrated on the buccal side of the
premolar area.
2. The support of the implant reduces the burden on the abutment while making the occlusal
force distribution more uniform.
3. The maximum stress of the implant is concentrated in the neck and 1/3 of the root.
4. In the premolar area, the implant effectively disperses the force and reduces the stress value
of the cortical bone; In the molar area, the cortical bone takes more occlusal force and the
implant is protected.
23
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28
Tables and Figures
Table 1. Group of Experiments
number position
① 0 blank control
② 0 CRPD
③ 1 #4
④ 1 #5
⑤ 1 #6
⑥ 1 #7
Table 2. The number of nodes and units in the experimental model
Table 3. Material mechanics parameter
Part Elastic Modulus Poisson's ratio
Implant 107000 0.33
Cortical bone 13700 0.30
Cancellous bone 1370 0.30
Periodontal ligament 69 0.45
Mucosa 3 0.45
Natural tooth 20290 0.3
Denture base 2352 0.33
1 2 3 4 5 6
Nodes 17067 18492 18937 18983 18987 18988
29 Table 4. Maximum stress of an implant
Table 5．The maximum stress value of cortical bone of an implant
Table 6. Maximum stress for cancellous bone at the time of one implant
Model Blank control CRPD #4 #5 #6 #7
Stress maximum
（MPa）
0 0 1.654 1.736 1.316 0.972
Model Blank
control
CRPD #4 #5 #6 #7
Stress maximum
（MPa）
Premolar area stress
（MPa）
0
0
0
8.917 * 10-1 4.980 * 10-1 5.652 * 10-1 4.950 * 10
-1
5.460 * 10-1
2.13 * 10-1
1.74 * 10-1 2.11 * 10-1 2.04 * 10
-1
2. 07 * 10-1
Molar area stress
（MPa）
0.813 * 10-1 0.44 * 10-1 0.459 * 10-1 0.692 * 10
-1
0.343 * 10
-1
Model Blank
control
CRPD #4 #5 #6 #7
Stress maximum
（MPa）
0 1.098 * 10-1 4.221 * 10-1 3.167 * 10-1 2.362 * 10
-1
1.524 * 10-1
Premolar area stress
（MPa）
0 0.8 * 10-1 0.2 * 10-1 0.45 * 10-1 0.63 * 10
-1
0.78 * 10-1
Molar area stress
（MPa）
0 0.37 * 10-1 0.35 * 10-1 0.22 * 10-1 0.16 * 10
-1
0.16 * 10
30
Table 7. The maximum stress value of the mucosa of an implant
Table 8 The maximum deformable value of a denture of an implant
Model Blank
control
CRPD #4 #5 #6 #7
Negative displacement
（mm）
0 1.351 * 10-3 1.249 * 10-3 1.733 * 10-3 1.734 * 10-3 1.713 * 10-3
Positive displacement
（mm）
0 3.150 *
10-4
2.432 * 10-4
1.287 * 10-4
1.758 * 10-4
4.553 * 10-5
Model Blank
control
CRPD #4 #5 #6 #7
Stress maximum
（MPa）
Maximum displacement
（mm）
0
0
2.516 * 10
-1
2.045 * 10
-1
2.415 * 10
-1
1.620 * 10
-1
1.583 * 10
-1
1.108 * 10
-3
9.436 * 10
-4
1.448 * 10
-3
1.433 * 10
-3
1.419 * 10
-3
Premolar area stress（MPa）
0 11.08 * 10
-4
6.985 * 10
-4
1.55 * 10
-4
10.59 * 10
-4
10.5 * 10
-4
Molar area stress（MPa）
0 3.81 * 10
-4
2.083 * 10
-4
1.40 * 10-4 3.107 * 10
-4
3,121 * 10
-4
31
Fig. 1 CBCT scan of mandible before implantation with unilateral free dentition defect
Fig. 2 Mandibular-mucosa 3d finite element model
Fig. 3 Mandible-mucosa-implant 3d finite element model
32
Fig.6 Assemble an implant to the diagram Fig. 7 Diagram of loading conditions
Fig. 8 The implant is located at 4 Fig. 9 The implant is located at 5
Fig. 4 3d finite element model of denture Fig. 5 Mandibular - mucosa - denture 3d finite element model 3d
finite element mode
33
Fig. 10 The implant is located at 6 Fig. 11 The implant is located at 7
Fig. 12 Maximum stress of an implant
34
Fig. 13 Blank control group Fig. 14 CRPD control group
Fig. 15 The implant is located at 4 Fig. 16 The implant is located at 5
Fig. 17 The implant is located at 6 Fig. 18 The implant is located at 7
35
Fig. 19 The maximum stress value of cortical bone of an implant
Fig. 20 Blank control group Fig. 21 CRPD control group B control
36
Fig. 22 The implant is located at 4 Fig. 23 The implant is located at 5
Fig. 24 The implant is located at 6 Fig. 25 The implant is located at 7
Fig. 26 Maximum stress for cancellous bone at the time of one implant
37
Fig. 27 The stress of CRPD group Fig. 28 The displacement of CRPD group
Fig. 29 The implant is located at 4 Fig. 30 The implant is located at 5
Fig. 31 The implant is located at 6 Fig. 32 The implant is located at 7
38
Fig. 33 The implant is located at 4 Fig. 34 The implant is located at 5
Fig. 35 The implant is located at 6 Fig. 36 The implant is located at 7
Fig. 37 The maximum stress value of the mucosa of an implant
39
Fig. 38 CRPD control group Fig. 39 The implant is located at 4
Fig. 40 The implant is located at 5 Fig. 41 The implant is located at 6
Fig. 42 The implant is located at 7