10 mm 10 mm 20 mm, 180 # 240 # 600 # 800 # # 2 mm 2 mm, TR IBOLO GY Sep, 2004

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1 24 5 V o l 24, N o TR IBOLO GY Sep, 2004,, (, ) :. :,,, ;,,. : ; ; ; : TQ 174; TH : A : (2004) ,.. 7 8, 2 20.,, [1 ]., [1, 2 ].,. (6 13 ),.,. [3 ],.,. [4 10 ],., [3 ],,,,, ,, 0 4., 4, 10, Table 1 Four k inds of natural teeth at differen t ages Samp le P rim ary teeth Perm anent teeth at early stage Perm anent teeth at m edium stage Perm anent teeth at later stage A ge 6 12 years o ld years o ld years o ld years o ld 10 mm 10 mm 20 mm,,, 180 # 240 # 600 # 800 # # 2 mm 2 mm,, Λm 5. 0 Λm 1. 0 Λm 0. 5 Λm R a= 0. 2 Λm.,,. ( 320H V 50g), <40 mm 350H V 50ġ 1. 2, : ( ). : ; : g, e2m ail: zhengj186@ 163. com. :,, 1974,,.

2 [3 ]. 40 m in.. : p n= 20 N, D = 1 mm, f = 2 H z, 25, , 1 000,,, 30 m in,., (CL SM ) ( Λm, 10, ) ; (a) P rim ary too th (b) Perm anent too th at early stage and m edium stage (c) Perm anent too th at later stage F ig 1 V ariation of friction coefficients of various natural teeth sliding against T i alloy w ith cycles , 450, , [ 1 (a) ]., 20, , ; ( 0. 16) ( 0. 93) ( ) [ 1 (b) ]., (0. 25), ,

3 5 : 473, ,, [ 1 (c) ]. 2 F ig 2 CL SM surface mo rpho logies of natural teeth at different ages 2 CL SM CL SM.,,,.,, T i ( 450).,,, [11 ] F ig 3 CL SM mo rpho logies of w o rn surfaces of natural teeth at different ages 3 CL SM CL SM.,, [ 3 (a) ].

4 [ 2 (a) ], ( 2), [1 ],.,. [ 3 (b) ];,, [ 3 (c) ];, [ 3 (d) ].,,,, Table 2 Surface hardness and wear scar depth of natural teeth at differen t ages Samp le H ardness H V 50g W ear dep thgλm P rim ary teeth Perm anent teeth at early stage Perm anent teeth at m edium stage Perm anent teeth at later stage ( H V ), ( Λm ), ; ( H V ), ( Λm ) ;.,, ( 2),.,,.,,.,, [1 ],. 3 a. ; ;, ;,,. b. ;,,,. : [ 1 ]. [M ]. :, [ 2 ],,. [J ]., 1990, 6 (1) : W u J, H uang Z R, Zhang B. Effect of zinc citrate and sodium fluo ride on too th hard tissue [ J ]. Journal of C linic O ral M edicine, 1990, 6 (1) : [ 3 ],,,. g [J ]., 2002, 38 (10) : Zheng J, Zhou Z R, Zhang J, et al. T ribo logical p roperties of natural too thgpure titanium [J ]. Ch inese Journal of M echanical Engineering, 2002, 38 (10) : [ 4 ] N ystrom N, Kononen M, A laluusua S, et al. D evelopm ent of ho rizontal too th w ear in m axillary anterio r teeth from 5 to 18 years of age[j ]. J D ent Research, 1990, 69 (11) : [ 5 ] H iro se M N, T ange T, Igarash i S, et al. In vivo fluo ride p ro2 files at different sites of buccal and lingual enam el surfaces ob2 tained by enam el biop sy of hum an m axillary first perm anent mo lars in young adults[j ]. A rch s O ral B io l, 1996, 41 (12) : [ 6 ] V an R H M, T ruin G J, F rencken J E F M, et al. P revalence, distribution and background variables of smoo th2bo rdered too th w ear in teenagers in the H ague of the N etherlands [J ]. Caries Research, 2002, 36: [ 7 ] Chuajedone P, Kedjarune2L enggat U, Kertpon D, et al. A sso2 ciated facto rs of too th w ear in southern Thailand [J ]. Rehabil, 2002, 29: J O ral [ 8 ],,,. [J ]., 2003, 23 (1) : Q iu Y N, L i T S, L iu W M, et al. F riction and w ear behavio r of hum an enam el eroded w ith different o rganic acids[j ]. bo logy, 2003, 23 (1) : T ri2 [ 9 ],,,. [J ]., 2003, 23 (6) : Zheng J, Zhou Z R, Yu H Y, et al. Effect of o ral environm ent on the tribo logical behavio r of p lastic teeth sliding against a ti2 tanium ball[j ]. T ribo logy, 2003, 23 (6) :

5 5 : 475 [10 ],. [J ]., 2004, 24 (2) : Zheng J, Zhou Z R. Study on tribo logical behavio r of hum an enam el sliding against various counterparts under lubrication of artificial saliva[j ]. T ribo logy, 2004, 24 (2) : [11 ] Zhou Z R, Gu S R, V incent L. A n investigation of fretting w ear fo r two alum inium alloys [J ]. T ribo logy International, 1997, 30 (1) : 127. Tr ibolog ical Behav ior of Natural Teeth of D ifferen t Ages ZH EN G J ing, SHA W ei, ZHOU Zhong2rong (K ey L aboratory f or A d vanced T echnology of M aterials of M inistry of E d ucation, S ou thw est J iaotong U niversity, Cheng d u , Ch ina) Abstract: A recip rocal sliding friction and w ear tester w as perfo rm ed to investigate and compare the friction and w ear behavio rs of natu ral teeth of differen t ages sliding again st titan ium alloy under the lub rication of ar2 tificial saliva. T he m icro structu res and w o rn su rface mo rpho logies of the tested teeth w ere ob served w ith an op tical m icro scope and co2focu s laser scann ing electron m icro scope. It w as found that the friction and w ear behavio rs of the natu ral teeth of differen t ages w ere strongly dependen t on the age, w h ich w as related to the differen t m icro structu res of the teeth at differen t ages. N am ely, the early2stage perm anen t teeth show ed sim 2 ilar friction and w ear behavio rs as the m edium 2stage perm anen t teeth, and the m edium 2stage perm anen t teeth had the best w ear2resistance among the teeth of differen t ages. T h is w as becau se the m edium 2stage perm a2 nen t teeth had the mo st compact and strong m icro structu re, w h ich con tribu ted to p reven ting them from se2 vere scuffing and ab rasion in a long run. Con trary to the above, the p rim ary teeth and later2stage perm anen t teeth had relatively fragile and w eak m icro structu res, therefo re they show ed relatively poo rer w ear2resistance than the ea rly2stage and m ed ium 2stage p erm anen t teeth, ow ing to the liab ility to be scuffed and ab raded. T h is accoun ted fo r the mo re severe scuffing and ab rasion sign s on the w o rn su rface of the p rim ary teeth and later2stage perm anen t teeth as compared to that of the early2stage and m edium 2stage perm anen t teeth as w ell. Key words: natu ral teeth; friction and w ear behavio r; age; w o rn su rface mo rpho logy Author: ZH EN G J ing, fem ale, bo rn in 1974, A ssociate P rofesso r, e2m ail: zhengj168@ 163. com