Figure 5. Proportion of the occlusal contact area and occlusal load of the whole molar region accounted for by the implant prosthesis and by the contralateral tooth
Figure 4. Comparison of the first molar-eliminated occlusal contact area and load between the implant side molar region and contralateral side molar region
Figure 3. Comparison of the occlusal contact area and occlusal load between the implant side molar region and contralateral side molar region
Figure 2. Comparison of occlusal contact area and occlusal load between implant and contralateral tooth
Figure 1. Comparison of the occlusal contact area between Occluzer and BiteEye
Table 8 Two-way ANOVA of the proportion of occlusal load and contact area for implants and first molars based on molar area
Source
Sum of square
df
Mean square
F value
P value
Occlusal load
Occluzer
Implant or natural tooth
585.390
1
585.390
9.870
0.014
MVC
53.901
3
53.901
1.768
0.220
Interaction
46.872
3
46.872
3.79...
Table 6 Two-way ANOVA of the occlusal contact area of the implant side molar region and contralateral side molar region excluding the first molar
Source
Sum of square
df
Mean square
F value
P value
Occluzer
Implant side and contralateral side
2.177
1
2.177
0.383
0.165
MVC
90.753
3
30.251
25.800
0.553
Interaction
9.011
3
3.004
2.209
0.113
...
Table 5 Two-way ANOVA of occlusal load of the implant side molar region and contralateral side molar region
Source
Sum of square
df
Mean square
F value
P value
Implant side and contralateral side
8578.099
1
8578.099
1.354
0.278
MVC
193,888.518
3
64,629.506
36.593
0.000
Interaction
30,575.358
3
4016.245
3.153
0.430
Table 4 Two-way ANOVA of the occlusal contact area of the implant side molar region and contralateral side molar region
Source
Sum of square
df
Mean square
F value
P value
Occluzer
Implant side and contralateral side
24.453
1
24.453
2.334
0.165
MVC
159.749
3
53.253
26.918
0.000
Interaction
16.135
3
5.378
3.786
0.024
BiteEye
Implant side ...
Table 3 Two-way ANOVA of occlusal load of implant prosthesis and contralateral tooth
Source
Sum of square
df
Mean square
F value
P value
Implant or natural tooth
8732.252
1
8732.252
13.299
0.007
MVC
14,619.565
3
4872.855
16.724
0.001
Interaction
2200.789
3
733.596
8.442
0.001
Source
Sum of square
df
Mean square
F value
P value
Occluzer
Implant or natural tooth
1941.060
1
1941.060
1.074
0.333
MVC
424.098
3
141.336
1.958
0.147
Interaction
262.581
3
87.527
1.345
0.283
BiteEye
Implant or natural tooth
28.022
1
28.022
6.892
0.030
MVC
3.374
2
1.687
1.927
0.178
Interaction
0.916
2
0.458
0.827
0.4...
No.
Sex
Age
Implant system
Implant site
1
F
35
Straumann
Right
2
F
39
Brånemark
Left
3
F
47
Brånemark
Left
4
F
49
Brånemark
Left
5
M
43
Straumann
Right
6
M
46
Straumann
Right
7
M
69
Straumann
Right
8
M
48
Brånemark
Left
9
M
67
Brånemark
Right
Measurement of occlusal contact area of implant prosthesis
Dental Prescale has a thickness of approximately 100 μm, whereas Blue Silicone has less thickness and is therefore likely to give more accurate measurements of the occlusal contact area. In addition, when the occlusal contact areas of implant prostheses and their contralateral teeth were compared, the occlusal contact area of the c...
Measurement of occlusal contact area of implant prosthesis
Dental Prescale has a thickness of approximately 100 μm, whereas Blue Silicone has less thickness and is therefore likely to give more accurate measurements of the occlusal contact area. In addition, when the occlusal contact areas of implant prostheses and their contralateral teeth were compared, the occlusal conta...
Measurement of occlusal load
Occlusal load was measured with Dental Prescale and analyzed with Occluzer. The Dental Prescale system allows occlusal contact pressure to be measured quickly and easily across the dentition, and it is of enormous clinical utility because its accuracy and reproducibility in the molar region have been confirmed. The technique using this sequence and also the ...
Discussion
Subjects and dentition
Males outnumbered females in the present study, but there have been no reports of differences in mean occlusal load between males and females in the 50–54 age group. While there have been reports that in healthy, dentulous subjects, the total occlusal force in the molar region on one side is approximately 400 N at maximum clenching st...
Comparison of proportion of occlusal contact area and occlusal load on the molar region accounted for by prosthetic implant and contralateral tooth
With both BiteEye and Occluzer, the proportion of the occlusal contact area on the molar region overall accounted for by the prosthetic implant was less than the proportion accounted for by the contralateral natural tooth, and ANOVA showed this differ...
Comparison of implant side and contralateral side molar regions
Comparison of occlusal contact area in the molar region
The occlusal contact area in the molar region on the implant and contralateral sides increased with clenching strength and, at clenching intensity of 60 % MVC or above, was less on the implant side molar region (Fig. 3). ANOVA results (Table 4) showed no...
Comparison of occlusal contact areas evaluated using Occluzer and BiteEye
Occlusal contact area values obtained with BiteEye and Occluzer at clenching intensities from 20 to 100 % MVC were compared (Fig. 1). At different clenching intensities, the contact area values of BiteEye with silicone thickness of 10 μm (BE 10 μm) were the most si...
Analysis of the results from Occluzer and BiteEye
The following calculations were performed:
Comparison of Occluzer and BiteEye in the occlusal contact area
Comparison of the occlusal contact area and occlusal load between the implant and same number of natural teeth on the contralateral side
Comparison of the occlusal contact area and occlusal load between molar area...
Measurement of occlusal contact area using BiteEye
A material for checking accuracy of fit (Blue Silicone®; GC, Tokyo, Japan) was used to examine the occlusal contact in the intercuspal position. The occlusal contact area was measured once at each clenching strength (20, 40, and 60 % MVC) using visual feedback. Subject posture was the same as during Prescale measurement....
Electromyograph attachment
Masseter muscle activity was measured using an electromyograph (PowerLab; ADInstruments, Nagoya, Japan). Silver disk electrodes of 10 mm in diameter with bipolar leads (Duotrode; Morita Corp., Osaka, Japan) were adhered on both sides of the central part of the masseter muscle. The distance between electrodes was 21 mm, and the electrodes were pl...
Methods
Subjects and dentition
Subjects were nine outpatients (5 male, 4 female) attending Showa University Dental Hospital, aged 35–69 years (mean age, 49 ± 12 years) (Table 1). All subjects were cases of single implants placed at the mandibular first molar deficit, on the day of implant prosthesis setting and occlusal adjustment. The criteria for subject selection were no inflammatory...
Background
Implants maintain osseointegration with the inside of the bone over long periods of time, and mechanical factors are important for retaining function. Particularly, when natural teeth and implants are present together, differences in tissue displaceability when they are subjected to occlusal force may cause dynamic imbalance from strong to weak clenchi...
Abstract
Background
Occlusal contact on the implant superstructures is important for successful treatment. The purpose of this study was to investigate the occlusal contact of single implant superstructures at the mandibular first molar immediately after seating from weak to strong clenching.
Methods
Subjects were nine patients who had just been fitted with an implant prosthesis in the mandi...