Corbet, EF

Jin, LJ

Leung, WK

Lo, ECM

Zee, KY

Journal of Dental Research

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Title Periodontal conditions in adults resident in Lhasa, TibetAuthor(s) Corbet, EF; Jin, LJ; Lo, ECM; Leung, WK; Zee, KYCitationThe 14th Annual Scientific Meeting of the InternationalAssociation for Dental Research (Southeast Asian Division), FortCanning Lodge, Singapore, 27-29 September 1999. In Journal ofDental Research, 2000, v. 79 n. 5, p. 1317, abstract no. 14Issued Date 2000URL http://hdl.handle.net/10722/53799Rights Creative Commons: Attribution 3.0 Hong Kong LicenseJ Dent Res 79 (5) 2000 Divisional Abcstracts: Southeast Asian Division 13179 ART fillings placed in Chinese preschool children - results after 30 months.10 Efficacy atcl Safety of A Homne Bleaching System using Three Progressive Strenghs or9...L, ..HLGRN(autyo etity nvest fHogKn)Canhamide Peroxide - oh6-month chenioot eva'ationo CG Toh5 (Dept of Consmovative Dentistry.E.C.M LO*, C.J. HLMGREN (Faculty o Dentistry, Univerity of HongKong)University of Matava, Kuata Lumpor, Malaysia)The aim of this study was so e-v,loate the efficacy and safety of a dentist-prescrihed at home tray-apptied toothThe aim of this study was to evaluate longitudinally the status of ART fillings placed in primary whitening system (Triott-Step Blleaching System. American Dental Hvgieoics, USA). Fotty-two adults (IS motes, 27teeth under field conditions in Chinese preschool children. In December 1996, a total of 170 femnates) with various forms of tooth discotouration participsted in the anudy with 40 completing treatment and 2ART fillings were placed in the primary teeth of 95 children aged 3-6 years in a kindergarten in dropping act in midst of treatment. One suhject wish severe discoloaration stopped treatmeet when improvement wassouthern China by seven final year dental students under supervision of. their teachers. The not seen. Another dropped oat for unhnown reasons and wss not contactahle.material used was a hand-mixed glass ionomer, Ketac-Molar (ESPE). The fillings was assinssed Th cjcswr nncn owa asmformned custom-fitted soft tray that was applied with t% carhamideclinically every 6 months after placement for 30 months by two independent dentists. The peroxide for hosretwicena day for 7 days, followed consecutively for 7 days ench of t3% and t60% casinamide peroxideevaluation criteria was success (filling present and not needing replacement) or failure (fitting geopposi rsjtwiact alacringatmaufcontentniTcton. Treatmenofposgjahgn2wekInte waftercmtedioe ofe 3%w foirestwiohthdislodged or in need of replacement). Over two-thirds of the fillings were followed up for 30 Vita Shade Guide Tneasuremencs and colour slides were used to evaluate colour of teeh at haseline, as each wveetymonths. The filling success rates were as follows: recall throughout period of treatmect and h months after comptetion of treatment. Poteentiat side efforts such as toothhypersensitivity, gingivat and stomach irritation were assessed as each visit hy questiosuire and clintcat examinatton.Success rate ()All examinations, instractiomand evaluations were carried nout hy the author is the same clinic inthe moenings.Class No. placed 12 months 24 months 30 months Thirty-eight suhjmcts had significant tighteni'ng of their tooth colour hy 2-3 shades with 30 cases of maxittary teeh sod1 53 90 76 76 29 mandibular teeth rated at having attained At shade at end of treatment. Two suhjects wtth ray severe2 32 75 6 4discolosration did not have significant improvement. The colour change was stahte as 6 moctha with onty 2 suhjects314 61 32 22 1 4 ~~~~~~~~~~~~~~~~~~~~~~eshihiting shade dasher than shade attained after comptetion. Transient tooth senstivity either daring or for shosl3/ 61 32 22 14 period after treatment wasmexperiencedhby t6 suhjectswhenausing II% gel. IS suhjects for t3% gel and 13 suhjects for5 24 79 77~~~~~~~~~~~~~~~~~~~~~~~16%gel Only 9 suhjects had mild gingival irritation with sahject complaining of mitd stomach irritation afterThe differences in success rates between class types were statistically significant in all three sallatowing the get daring initiat treatnmet. On a 5-point categorical scae, att]hetsecp for trwo reported eitherexaminations (Chi-squared test, p<.c0.01). The result showed that the success rates of Class 1 vr ap 2)o ap t)wt h eot haedI a euae ht1it.tpSeciySse aand Close6 ART fillings placed in primary teeth in Chinese por-school children over 30 months orovide avey definitive whitening of teeh except for cases of ver severe discolouration. Patients mayespeiencetraniment tooth seenisitvity or ai*gvat irritat_ion daring orfor short period after aC-tive treamec.were satisfactory. This ststdy wat supported in part hy Rtaydent Supplies (S) Ptc Ltd and American Dentat Hygienics,USA.This study was supported by ESPE Dental-Medizin GMBH & Co.Moisture Absorption Of Carbon Reinforced Reain Poeft I iuplil hcns arain nteoaaiyPL LOH', K RAVIt. VK GANESHrt, 5 RAMAKRISt-NA2, CL CHEW' 1 2 In BSituUpelacethcnessM variations. i6njteu ra viy(Faculty of Dentistryt, Faculty of. Englneerlng2. National University of Singapore) A. Det.Sonf Caserioog, Mentannigcult.,UOnivritfso,NrwyCarbon fiber reinforced resin dental post has been avaitable for restoration of enedodontically treated 2. Clinic of Operat. Dent. and Periodont., Christian-Albrechts-Universityteeth. It is known that compeosfe materials absorbed moisture. The obsiecive of ethis study was to of Kiel, Germany.detrevnine the moisture absorptian properties af a coenmeeciltty available post (C pent, B10sc lnc. USA) Earlier studios have shown that formation of buccal pellide takes place in two stages. Firstlyand an expeatmental carbon fiber reinforced resin post (PG post). The moisture absorption propertiea a basal granular layer is formed on the enamel surface, thereafter a second globular layer.ware evaluated ashng ASTM standard test method tDesignation:D52291D5229M-9z). The specimens The aim of the present study was to investigate the ultrastructural appearance and relativewere first dried in a vacuum oven at gO0 C and kept isa desiccator after it reached It effective moistureequilibrium. The baselIne meanwas recorded. The speicmnens were then placed in coeditioning, chamber thickness of the pellide formed on the buccal and lingual sides of the first molar in the upperwith distilled water at 25 0 C, 4d0 C and e00 C. The specimens ware weighed daily to monitor mscas and lower jaw. Furthermore to assess the influence of the shearing forces (rubbing action)changes for 28 days. Similar trends in moIsture absorption was observed in both groupe of specimens, from the tongue on the pellicle formation in situ. Pumiced enamel pieces were mounted inThe maxdmum moisture contenit (MM) and diffusivaty (Dz) increased with time of exposure to moisture appliances fitted for the upper and lower jaws and.pellidle was allowed to form onand temperature, unprotected or protected surfaces for 2 hours. To eliminate the contacdt with the tongue,Mm (9k) Dz /104 enamel pieces were covered with orthodontic bands (for Auger analysis) or pellicle was25-C 40f' C 60cC7 25C'C 40e C seeC allowed to form in enamel slots (for TEM examinations). Six study subjects carried theC post 2.12 2.186 2.40 1.375 1.555 1.682 enamel specimens on the various oral sites. After removal from the appliances, the enamelFG pest 2.38 3.00 3.02 0.1e4 0.238 0.283 pieces were ninsed in phosphate buffer and examined by Auger analysis or TransmissionThe moisture contest incemased linearly in the first 38 hours and gradually approached a constant level, andlowero siteos)consisThedoTwolxayers,wheres thoed glbuarsellcondflayerwucaslno(uperesnTherewanwangifnontdsignificantmforthdifference-tet. in5 Mmz fore sthe twot. ndgroeapies)(I-test,oftwolpyrs,wh)eastDe lshowedecndsignificantprsendifferences (I-test. Pa 0.05) between the two groups. Itcan be corchudedi that the FGost showed in the pellicle formed on the lingual side of the upper molar. The pellicles formed on thesionificantly lower diffusivNvo than theC Ipost. The maximum moistare contest for the two types of Ds protected- were not different from those formed on the unprotected surfoces. The Augerwere similar, This stady was supported by HNtS academic research granit No 980378/A analysis corroborated the results from the TEM. The results indicate that the variation inpellicle thickness is not influenced by therubbing action of the tongQue.13 CPITN and periodontal attachment loss insa high-risk population. I A Periodontal Conditions in Adults Resident in ILhoss, Tihet.TAIYEB ALl TBa RAZAK IA, ZAIN RB (Faculty of Dentistry, University of ' ~ E.F. CORBET*, LU. JON, E.C.M. LO, W.K. LEUNG, K.Y. ZEE.Malaya, 50603 Kuala Lumpur, Malaysia). (Faculty of Dentistry, The University of Hong Kong.)The aim of this study was to dctcnrninc the CPITN sod the periodontal attachisnat loss statuas insa Lhasa is the world's highext city. There have been no reports on the oral health status of its adulttargeted high-risk population of Indian estate dwellers. The study population comprised of 208 residents. T'he aim of tis study was to report on the penodontal status of adult residents of Lhasasubjects out of whom 34.1% were males and 65.9% females. Thse age categories of subjects were and to compar tepenodontal status of native urban Ttbetans wtth that of Hon Chinese. A< 45 years (44.7%/1), 45-605 years (43.3%) and > 60 years (12%). All subject were interviewed convenience sampl of 25-34 and 35-44 year-old employees of three major enterprises in Lhasa wasbased o a stnotured qestioaas.aireand cliically xaminedusing he CPIeccriteradandlInstofwecruite.aAllesbjectsnereoexminedeb oneiofthreeatained sxaminer. hTheehghestmCmmunitatached nastructuA) m ueasuremnts. Wci a sn h T c'ei n oso Periodontal Index (CPT) score and Attachment Loss (ALoss) score for each sextant was recorded. 97attahemreaence(Of) peasriodontaldseaews. 0.Temjrt fsbet eo 5y adults aged 25-34 and 88 adults aged 35-44 were examined. The percentage of subjects by theirThe prevlence o periodntal disase was106%. Te niajorty of sbjects highesteCPsIhandigAeossPI scoresosissgivenisnvethentableabbelow:wmaximtum CPITN score 3 ( 53.8%) whilst the majority in the older age categories had maximum CPI ScoeesCPITN score 4 (45-60 years = 50.6%, > 60 yeam = 60.9%). However these differences were not Age Ethnkicty a e 2 3 4staisicalysinircat.In terms of sextants, the highest percenTtage involvement was CPITON 3 25-34 Han 30 5 0 43 37 20statistically significant. ~~~~~~~~ ~~ ~ ~ ~ ~~~~~ ~~~~~~~~~~~Tibetan6700 57 39for all age categories. T'he majority of subjects < 45 years (42.9/%) and 45-60 years (42.9%/) bad 35-44 Han 34 0 0 24 36 20maximum LOA of 6-8 mm. On contrast the majority of subjects above 60 years (62.5%) bed Tihetan 34 0 0 33 43 22maximum LOA of 9 mm or more. These differences were statistically significant (p<0.O0 I. In A____oss_______Scores ________terms of sextants, the maximum LOA with the highest percentage involvement for the age group Age Ethateity n (03-4 minI 11(4-h ml) 2 (h-8 mm) 3 It-It minI 4111mm+)<45 years (57.2%) and 45-60 years (43.5%) was 3-5 mm, whereas for those above 60 years 2 T-34Ha 30 47 30 20 0 3(38.4%) it was 6-8 mm. Ti44Hean 67 4h 376 15 2 0The results of this study confirm that theOndian estate popadation is a hig&h-risk gcoup for 3544 Ha 34 21 56 21 0 3neiodontal diseaseandneriodontal attachment lost. Italso indica_tes thatthemaximumCPITN The younger Tibetan adult residents of Lhasa had a lesser prevalence of deep pockets than the Hanand LOA score on an individual basis overestimate the treatmnents needs in termns of sextant (P < 0.05). However there was no difference (p > 0.05) between the two ethnic groups in terms ofinvolvement prevalence of the various levels of periodontal attachment loss within each age group.1 5 CPITN Assessment of Periodontal Consdition of Filipino Workers in Tokyo. 1 6 Periodontopathogens in Han Chinese and Tibet Patients with Adult Periodontitis.S. M. SAN MIGUEL*, K. CARiNO, E. SUGIYAMA, I. ISHIKAWA, L.. JIN*, W.K. LEUNG, E.F. CORBET, E.C.M. LO and K.Y. ZEE.(Department of Periodontology; Department of Preventive Dentistry, (Faculty of Dentistr, The University of Hong Kong).Medical andDentalUniversity, Tokyo, Japan).This prelimiinary study was to determine the presence and infection patterns of live suhgingivalTokyo MdcladDnaUnvriyToy,Jp ).perioodntopathogens in adult periodontitis(AP) patients from Hong Kong and Tibet. The participantsThe objective of this study wan to determine the periodontal condition of Filipino were 26 patients with untreated AP, 14 Han Chinese residents in Hong Kong(HK-group) and 12 ago-migrant workers in Tokyo Metropolitan Area. The study population consisted of 163 and periodontal disease-mnatched Tibet residents in Lhasa, Tibet(Tibet-group), aged 30 to 55 yrs. OfFilipino workers (79 men and 84 women) aged 05-64 years old. The demographic the Tibet patients, 6 were native Tibetans and 6 ware Han Chinese who had lived in Tibet . 10 yrs.10 healthy Han Chinese from Hong Kohig were used as controls. On eac'h patient, subgingival plaquesprofile of the subjects was obtained through a self-administered questionnaire. The were collected by two paper points, one from periodontitis site with deepest probing depth(5-8 mmn)WHO probe was used in determining the CPITN scores. At the same timne, and one from a site without periodontal destruction. In each control subject, two healthy sites wereperiodontal attachment loss from each sextant wan also measured. Periodontal sampled. Five species-specific DNA probes were used to detect the presence of A. actinomycerem-comitansfAa), B. forsythusfBfl, P. gingivalis(Pg), P. intermediafPi) and T. denticola(Td), with aconditions according to the highest CPITN code per person, were as follows: Healthy sensitivity> 103 cells/sample. Aa could not be detected in any subjects. In healthy controls, only Pi(CPITN 0)=10.4 %, Bleeding (CPITN 1)=6. 1 %, Calculus (CPITN 2)w48.5 %, was detected in two subjects. Bf, Pg. Pi and Td were frequently detected in both HK.group(79%,Shallow pocket (CPITN 3)=20.3 %, Deep pocket (CPITN 4)=14.7 %. Data also 93%, 71% and 93%) and Tibet-group(75%, 83%, 83% and 75%), respectively. These species weremore frequently found in periodontitis sites than in sites without destruction, within both HK-grouprevealed that age, sex and type of work of Filipinos were signifscant demographic and Tbet-roa as etrmne by 1tteIts(p.c0.Ot) Th-reoianifeto pater in per-- -Iodontici

Periodontal conditions in adults resident in Lhasa, Tibet

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Periodontal conditions in adults resident in Lhasa, Tibet

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