Kwong, SM

Pashley, DH

Tay, FR

Yip, HK

Journal of Dental Research

HKU Scholars Hub

Title Surface characterization of noncarious cervical sclerotic dentinfollowing treatment with different acidic conditionersAuthor(s) Yip, HK; Kwong, SM; Tay, FR; Pashley, DHCitation14th Annual Scientific Meeting of the International Associationfor Dental Research (Southeast Asian Division), Fort CanningLodge, Singapore, 27-29 September 1999, v. 79 n. 5, p. 1319Issued Date 2000URL http://hdl.handle.net/10722/53913Rights Creative Commons: Attribution 3.0 Hong Kong LicenseJ Dent Res 79 (5) 2000 Divisional Abstracts: Southeast Asian Division 131925 Oral Health Status of Chinese with Down syndrome - A pilot study 26 Potential Use of ART Tecitniiquc in the Management of Dental Caries in tise school dentatCHU, CH (FACULTY OF DENTISTRY, THE UNIVERSITY OF HONG service in Indonesia. RR. Darwita*. A. Raharjo. A. Bahar, F. Setyawati atid J. Wisnu (Dept.KONG, HONG KONG, CHINA) of Dental Pstblic Health and Preventive Dentistry. Faculty of Dentistry University ofItidonesia)Down syndrome (DS) is one of the most common clinically recognizable categories of mentalsubnormality. However, studies on Chinese with DS are very limited. The purpose of this study Extrasctionii ilithe iost commi-on dental treattiettit provided for primary schoolchildren in Jakarta and otherwas t conuct aora healh suvey n Chiese ith D in ong Kng. ight-five out of 380 treas ini liidonesia. in an effort to imnprove the situatiots. a sitnple treatment technique hased on the conceptmembers of the Hong Kong Down Syndrome Association participated in this survey. The i-f titiitisiial iinterveittion called the Atraumatic RestoratvTratns(R)tcnquwsitouedtsieparticipants were divided into 3 groups. Group 1 was 18 participants aged below 6 with primary m;hool detital health service. Previous studies had shown that ART is suitable in the inanagement of bothteeth. Group 2 was 22 participants aged 6 to 12 with mixed dentition. Group 3 was 45 c,iaitsel anid dentinal caries. This stuidy descrihes the prevalenice of dental caries whiiclt caii be inidicated forparticipants aged 13 to 34 with permanent teeth. The dmft and DMFT caries index was used ha ART Teclittique. A random samiple or 270 sclhoolchildren aged hetweest 1I Int 14 years froin 6 primarymeasure the caries experience and the Community Periodontal Index. CPI, was used to assess chooltsisl in tarhan Jakarta atid rmin Taiuggerang participated in the stuidy. Oral examination was carried out inthe periodontal condition. Twenty-five participants (29%) had congenital heardies.vra ilte schiools tinder nattiral light and using mouth mirrfors and explorers. The data collected wats analyzedthere was 59% of participants had no caries experience. The mean dmft and DMFT were 0.8*1.5 usitty a statistical package. Chi-square test wvas uised for test of significance. Results sliowed that theand 2.3±4.0. Twenty-six participants aged above 16 with no heart disease were examined for prosiptiton ofscaries tree teeth is slighitly higher in Tatiggeratig (53.4%) than Jakarta (46.6%). Hosvever, theperiodontal health. The percentage distribution of CPI score of 0 to 4 were 0%, 4%, 11%, 77% dilleresce is siot sigisificasst. Of the 626 pertisanesit teeth fostiod to tunve caries. 63.1% were caries siotand 8%. To represent the resultis in terms of treatment needs, all of them require oral hygiene reacltiiig the pulp attd ustiitable to be treated witlh ART technique. Wlsett comparing by location, there was noinstruction. On top of it, 96% requires scaling as well. Durin us xmnto, somne special oral ig iicaist difference between the proportion of teeth with enamel caries itt eitlser Jakarta (50%11) orfeatures and dental anomalies of the participants were observed; macroglossia was seen in 29% Tastiggerang (SOYa). However, more dentinal curious teeth were found in Jakarta schoolchildren 164.3%) asof the participants, 12% of the participants had fissured tongue, 69% of the participants were coitsspared tos she ittore rural Tanggerang (35.7%). The difference is found in be signific-ant at prOO. jjThefound to have a deep palatal vault. 35% of the participants have an open mnouth postur, 21% fitndings shosved that ART techniguithas a Rnoetial in ureventista the ic&ansion of Initial curious lesions inparticipants had peg-shaped lateral incisors and 27% of the subjects had missing lateral incisors. primtarv schoolchildren in Jakarta and TanasErang.In summary, caries experience was low and prevalence of periodontal disease was high in thisgroup of Chinese with DS. Special oral features and dental anomnalies were also common in DS.TE atdy us aPPliesties ef phoepheriec acid sand slf-stkhlg Primer to selerete deads.. C ero opst eis nlec fCnatSrs.A A CE27 FR TAYI; A ITFHAGARUNt; HK YIPI; NM KING'; SM KWONGi and DH pASHLEY228 OAWeofCm seRsi:InlncofotatS .A.YP,HE(tThe Univemity of Hong Kong, Hong Kong SAR; aMedical College of GA, Augusta, USA) C.L., ONG K.L. and TEOH S.H. (National University of Singapore, Singapore)This study critically examined, with the use of tranusststion electron microscopy (TEm), surface feattures ofscelerotic dentin after conditioning with: Group I, a self-etching primer, Cdeartl Liner Bond 2V (CLBV; Ocua otc ra(C)hsbe hw oece otc reae erb he ofvKuraray) for 30s; Group Its 32% phosphoric arid gel (Uni-Etch, Bisco) for ISa. The obectives were to clarify timeusi ia tde.ArcpoalcompreaeOC hson ssiown slixcedicngtwartdeviearaweasused retoinvstgaeseveral unresolved issues: a) whether the surface zone of sclerotic dentin is hypenmineralized and/or devoid of thesinclueniclofudcontAcsresspronaoCA esontdnwearoffucm devirestoatIe (iux,d Zto Anvstistoncollagen; and b) characteristics of the corel-like projections within the surface sane from the deepest partof theeifuneo otc msnOAwa ffu oPStretrtm(iu,Z 0 rsowedge-shaped defect. Ten bicuspids with deep, noncarious, cervical sclerotic lesions were randomly divided and Surefil). An amalgam restorabve (Dtapersaahoy) was used as control. The pattem andinto two groups. T'hey were gently cleaned with a slurry of chlorhexidine and pumice. In Group I, CLBV mehnisms of wear, and the relationshi between wear and composite surface hardnesswereadhesive resin wall aPPlied to the primned dentin surface. In Group II, CLBV primer wan applied tof also stuied. 30 wear apecWnens (8x4x2 mmn) and 6 hardness specimens (3x4x2 mm) wferphosphoric acid-conditioned dentin, followed by CLBV adhesive mein. One half of each tooth wa made for each material. Wearspecdmens were tested at 20 to 60 MPa contact stresse againstdemineahlized in EDTA while the other half was left undamineralized. Specimens were pont-fixed, dehydrated SS 304 counter-bodies with artiical ealva as lubricant up to 20, 000 cyceJs. Wear depth (pm; nand embedded in epoxy resin. Both undemineralized and demineralized ulteathin sections were prepared for = 6) wss measured using proflionetry. Hardness testing (KHN) wss done with a digitalTEM examination. Results: andemineralized, anstained sclerotic dentin from Group I showed s surface sirhardness tester (load = 500 gf, dwell timea 15 se). Results were analyzed byhypenfnineralized zone between 300.500 nm thick, within which elongated, electro-dens cryttallits were ANOVA,/Schsffe's (p < 0.05). At aN contact stresses, the amalgam alloy had signifcantly betteruniformly arranged perpendicular to the dentin surface into rod-shaped structures. The surface zone was also OCAwear resistance than the composites. Amalgam wear ranged from 5.9 to 11.8 pm for20 toevident in stained, demineralized sections, bet appeared amorphous. Colleges was sparse and those 6 P otc tes h ero 10(96t 7 m a inaatygetrta iuimmediately beneath this surface zone showed evidence of denatumation. Along the deepest pert of the wedge- (31.5Ston64pm) ArsUTon (24.4 105. pm)O and. turoi (2481pm 61.4 pm)nlforheadiferencothactSushaped defect, bacteria were trapped within the surface zone. In Group II, only a very thin electron-dense strsse.5 Co64p Arreltionbetwee contact stresand wueawssinfi c2. o ant4pm for ahe reatoratie winthcsurface zone could occasionally he seen after phosphoric acid-conditioning. Areas exhibiting thiu zone in correla oritioncoefcent( nranging fro m0.96wfor was008 forArisntfon.Th warmorvehnsmskdemineralized sections were devoid of intact, banded collagen. Resin infiltration into the underlying for athe ndi offerentcompositesnvarieddependingZon the 8contAct istresondTheiwer micr nstrmtredemineralized dentin, however, was not impeded and a hybrid layer of about 5 pm could he seen. ILtl frthedinflu reneo contactsitressvaie wearninwasmtherld netnraecontactstrewadtermmtucrsshypothesized that the surface zone of sclerotic dentin is a layer of denatured coliagen that has underone rhesle infl increofcnased stAwea Ther wasnoatenricant corrnelat,Incbease cnretactivesremsineralization. In the decept part of the defect that is least asmsesableus cleaning. bacteria wemrae thrnesskeandwnceardOAwa,Teews oso atcfeato ewe etrtvwithin this zone durins the course of remineralization.hrd wanwe.29 Surface characterization of noscarloes cervical sclerotic dentin following tretmeat 30 Adhesion of Dentin Blondingt Systems to Endodontically Treated Teeth. T.with different acidic conditioners. HK YIPaI; SM KWONGI0; FR TAYtard DH PAHE N3AD0N OAI .NKrO t.UIO n .TGM Dprmn(tT'he University of Hong Kong, Hong Kong SAR; 2Medical College of GA, Augusta, USA) ofKAIOpeatv DeNtZAIstry.ToKyA510r,..i ki-t). naU niversity,JT okyo, Jaeparmn).T'here isconcero that soeacidic conditioners used in bonding may not he strong enough so adequately etch Teproeof Oprthisvsed wants toy )yealulo hodttrnpnths ofvriy oko aa)noncrcosrio erticscl ot nicaldentin,tsubsratclinicallyexainerelevant ue osubstrate. puposThishisstudyws lexamined, with the useengts o thof ifscannings oelectron microscopy (SEMI, morphological features of sclerotic dentin following conditioning with Group dentin bonding systems to toothi prepnrcc fo- ondodontic treatment. Access cavityIs 32% phosphoric acid get (Uni-Etch, Bison, USA) for 15 s; Group It, a self-etching primer (Clearfil Liner preparation and removal oh pulpal tiSsrUD wvere performed in bovine incisors. The rootBond 2V, Kuraray, Japan) for 30 s. Twenty bicuspids with deep, buccal, noncarious, cervical wedge-shaped canals were treated with either saline (controt). chemiicat irrigants of 5% sodiumlesions were randomly divided into two groups. Another twenty sound bicuspids with artificial wedge- yohoiead3 yrgnprxd C) rceia riat n r niirbashaped defects prepared on buccal cervical dentin were used as a control fo thecloittwo groups.eoxde They werea iriansan a atiicobagently cleaned with a slurry of chlorhexidine and pumic using a brush. After the conditioning trestment, agent, formalin tricresol (FC). After storage in water for 1 week, the dentin surface waseach specimen was cryofractured into two halves through a pro-formed slit from the lingual surface. In ground to a flat surface with 600-grit SiC Linder water. The area for bonding wasGroup It, the self-etching primer was dissolved in absolute ethanol to reveal the features of the conditioned demarcated with a vinyl tape (4 mm-in-diametpr hiote). and bonded using eifther Clearfildentin. Specimens were dehydrated in ascending grades of ethanol and farther dried with Liner Bond 2V (LV2V; Ktiraray. Japan), Sing!e Bond (SB:, 3M. USA). or Superbond D-hesamethyldisilazane (HMDS) so prevent collapse of the conditioned surface. T'hey were prepared for SEM LnrDa S;SnMdcl aa) o osci ae o ,tniebn teghexamination teoclofl,the vcaoccddeeestpar,ocervical-shpeandsondeepestu1,epartd Liof Dshe(D;wedgedial.Japn).lesions.an inwInr Group, tnIie exposedgthsclerotic casts protruded from the surface of the phosphoric acid-conditioned sclerotic dentin. Tubules wrmesred using a univers;al cytihnr :ncirils-. at a crsharsedo m/mV edevoid of sclerotic casts were rendered patent. A 5 gm thick layer of deminermlized intertubular collagen teeth were tested for each grotup. Thpercm Iaes' %esti'5 (MPal were as follows;could he identified, sometimes with granular surface remnants. In Group II, a surface granular zoneremained slang the entire surface of the sclerotic lesions. The underlying dentin beneath the surface zone LB2VSi SDwas undemineralized and many tubules were blocked with sclerotic casts. Within the deepest part of thecnro 1653.) 49ASi 88 .2wedge-shaped sclerotic lesions in Group IL the surface zone was substantially thickened, and in addition, cotol 1 I (30 88 .2contained corel-like structures. This surface feature was also present discontinuously in the deepest part of dl 14.3 (3.111 11.9 3. 1 6.5 33the "wedge" is Group I. It was concluded that bondinia strategies that rely on resin infitmation inoF1313.) 98i25 I I.. )demineralized dentin couldhehamnered bythe reduced susceentibilitvsoacid demineralization insclerotic Mean (SD), Vertical bars Indicated no sintificant difference (p<0O05).dentin. Rarticularlywhena self-etchinez orimer was used. The chemicat irriganls and the a.f1ljjm'crgain a qnonL.id not affect the bond strengths ofthree dentin bonding systemis to d!s.crjir.31 Bond Strengths of Compomers Using Two Dentin Adhesive Systems 32 Compressive Strength Evaluation of PFM Crowns under Different Listing Cements.P. OMPHONE*. P.N.R.PEREIRA. T. NIKAIDO. J. TAGAMI K.KANCHANATAWEWAT" and SKUPTAPAKORN (Chulalongkom University,(Tokyo Med. & Deits. Univ.. Tokyo. Japan Bangkok. Thailand).Thbe compoemrs have been dsvsloped in the 1990s.-Ahich combine the technology of she glass-ionomer cementsand. _P6?rafahnfused-to-metal restorations (PFMs) have been succesafulty used for decades. Metalmasin compnaites.These maraials incdush simnple-step bhum5ng syasemsswhich are simple to handlehat pirovicse Inser substructur provides strength while veneering porcelain gives an esthetic appearance. Thehued strengShs tn dinstin. The purpose ofrshis study wsea ao improve she hoed strengths ofrthre osmmnrcisdly availabtle margin made of metal may show a dark line at the cervical area. In an esthetic zone, margincumpamens Xeno iSankin Kogyot. Dymna AP iDeamey/Dentsphy). and F20t00 Compoer t3Ml to sdentis usting two made of porcelain is recommended. This study was to evaluate the compressive strengths ofmotes sinti andmiverysincmpsithssbtinhout n sytestosusedJaotrlwr ChulewitP-LinerBand2y) ayand Singl3M FesW PPM crowns having metal margin (MM) and porcelain margin (PM) cemented with differentextracted bovine seah. storenfroamn, serem groundwith # 600-grit silicon carbide paper acer munning saear to form 1lam cements. 80 extracted of noncarious upper premolar teeth were prepared as a crowndenlin surfacraThe bonchng amessamwasdearcated with a vinyl tapr in which a 4 mm dameter hale wsea ins in the preparation, having 900 shoulder, 60 taper, 1.50 mm axial reduction and 2.00 mm occlusalOmtler.Surface treatment wsea prafonmad following eawh mmoufactures inastrctoin and hight-rand fur 40 reduction. Duplication were made and used Io fabricated crowns having two margin designs:secodsh.Stainless steel rudsh were c-enmedn nover the restnortive mameials asing a resin cement IPatavia 21.Kurorayl.The specimens were stared in 37 C seater fur one shy. The tensile hoed astregth was then meamurnd usting a Part I. MM and Part 1I, PM. Ni-Cr alloy (Heraeus) was used to fabricate subatructure anduniversal tinting macsine as cmosshnad speeduof 2 mnm/mninThe dtea wsea statistically analyned using one-way ANOVA followed with porcelain application (Vita VMK95) according to their manufacturers'and Fisher's PLSD tenst as she 5% level ofasignificance. recommendations. Crowns were then cemented on their respective teeth under a constant IcedTah.Tniludarenihau,i pmesadrsi upssW dni MPaL±SD2nt of 25 N using: Group 1) zinc phosphate cement (ZC, Shofu); Group 2) polycarboxylate 'cementOnginul SB B2V~~~~~~~~~~~~(PC,Durelon, ESPE): Group 3) glass ionomer cement (GI, Fuji PLUS, Gd); and Group 4) resinXenon 7.5 ± 3.1a P0.0e.5 13.6 ± 5.6 P<0.05 he.3 ± 3.1 rmn R'Ri~Rn .L ..U4'1 k-_ t

Surface characterization of noncarious cervical sclerotic dentin following treatment with different acidic conditioners

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Surface characterization of noncarious cervical sclerotic dentin following treatment with different acidic conditioners

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