Biomedical Engineering Reference
In-Depth Information
a
b
2
2
10 N
10 N
20 N
20 N
-2
-2
40 N
40 N
-6
-6
-10
-10
-14
-14
-18
-18
-1
-0.5
0
0.5
1
-1
-0.5
0
0.5
1
Width (mm)
Width (mm)
in the citric acid solution
in the artificial saliva
Fig. 4.9
Profi le of wear scars on the surfaces of enamel [
38
]
Fig. 4.10
Variation in the
wear volume as a function of
normal load [
38
]
In the citric acid solution
In the artificial saliva
30
20
10
0
10
20
40
Normal load (N)
wear volume under different loads in either the citric acid solution or the artifi cial
saliva. The paired Tukey's test (
t
-test) analysis revealed that under the same loads
(
P
< 0.001), signifi cant wear volume differences in the two wear media were only
observed when the test load was low (i.e., 10 N or 20 N), as shown in Table
4.3
. The
wear volume in the citric acid solution was not signifi cantly different from that in
the artifi cial saliva at 40 N.
Tooth wear in the mouth is a complex multifactorial phenomenon involving
chemical, physical, and mechanical processes. The rate of tooth wear may be asso-
ciated with such factors as age, gender, occlusal conditions, parafunction, gastroin-
testinal disturbances, excessive intake of citrus fruits or beverages with a low pH,
environmental factors, salivary factors, and congenital anomalies of dental tissues
[
44
]. Among these factors, the oral chemical environment plays an extremely
