Data from research paper by Hiroshi Kaneco, an occupational engineer in Japan, from
observing videotapes in slow motion of similar dental operations and settings, 1993.
Number of contacts in treatment
Time analysis in handling instruments
Treatment area time analysis
Findings of questionnaire on dentist's subjective symptoms
Number of contacts in treatment (Average)
Number
Tray handle
Light handle
Finger switch
Charts
Operating stool
Cabinet
Apron
Clothes
Dental chair
Total
Dr.
6
39(6.5)
32(5.3)
36(6.0)
11(1.8)
12(2.0)
6(1.0)
28(4.7)
34(5.7)
19(3.2)
217(36.2)
6
0
0
0
3(0.5)
9(1.5)
0
9(1.5)
6(1.0)
2(0.3)
29(4.8)
Asist.
6
12(2.0)
68(11.3)
6(1.0)
0
15(2.5)
81(13.5)
27(4.5)
28(4.7)
39(6.5)
276(46.0)
6
0
0
0
6(1.0)
4(0.7)
0
16(2.7)
30(5.0)
1(0.2)
57(9.5)
Upper panel: Chair type
Lower panel: Stable type
top
Time analysis in handling instruments
Number
Avg. number of pickups
Average time spent during pickups (sec)
Loss time (sec)
Proportion of loss time in total treatment time (%)
Instrument with tubing
Hand instrument
Instrument with tubing
Hand instrument
Instrument with tubing
Hand instrument
Instrument with tubing
Hand instrument
Dr.
6
19.7
8.2
7.3
4.1
143.6
33.8
9.5
2.2
6
27.3
8.6
0.9
2.2
24.6
18.9
1.6
1.2
Asist.
6
21.2
4.2
3.7
4.2
78.3
15.4
5.2
1.0
6
20.8
4.3
1.0
1.1
20.8
4.7
1.3
0.3
Upper panel : Chair type
Lower panel : Stable type
top
Treatment area time analysis (Average)
Number
Patient treatment time (min)
Procedure time (min)
Communication time (min)
Mouthrinsing
Treatment time without physical distortion or strain
Number
Time
Minutes
%
Chair type
6
192.1(32.0)
151.8(25.3)
5.8(1.0)
15.0(2.5)
9.1(1.5)
60.3(10.0)
39.7 %
Stable type
6
175.9(29.3)
156.2(26.0)
2.9(0.5)
0(0)
0(0)
154.2(25.7)
98.7 %
top
Findings of questionnaire on dentist's subjective symptoms (by site)
Years of practice
1-5 years
6-10 years
11-15 years
16+ years
Total
Types of equipment
Number of dentists
Number of dentists
Number of dentists
Number of dentists
Number of dentists
Number of dentists with symptoms
Number of dentists with symptoms
Number of dentists with symptoms
Number of dentists with symptoms
Number of dentists with symptoms
Past type
Chair type
3
2
5
4
6
5
18
14
32
25 (78%)
Full rest type
13
9
8
7
13
13
11
5
45
34 (76%)
Use both types
6
5
2
1
5
4
31
29
44
39 (89%)
Stable type
4
0
3
0
3
1
2
0
12
1 (8%)
Total
26
16 (62%)
18
12 (67%)
27
23 (86%)
62
48 (77%)
133
99 (74%)
top
Back to
the paper
.
