Darvell, BW

Dyson, JE

Journal of Dental Research

HKU Scholars Hub

Design of a self-contained apparatus for air turbine handpiece testing.

Title Design of a self-contained apparatus for air turbine handpiecetestingAuthor(s) Darvell, BW; Dyson, JECitationThe 13th Annual Scientific Meeting of the InternationalAssociation for Dental Research (Southeast Asian Division),Kuala Lumpur, Malaysia, 1-3 October 1998. In Journal of DentalResearch, 1999, v. 78 n. 5, p. 1174, abstract no. 38Issued Date 1999URL http://hdl.handle.net/10722/53643Rights Creative Commons: Attribution 3.0 Hong Kong License1174 Divisional Abstracts: Southeast Asian Division J Dent Res 78(5) 1999fit vivo Evaluation of Cheees Using Intra-Oral Cariogenicity Testing. 2A rTe pattera of caries attack and implications for caries control in 16-year-old330K..TUB IadMEj UZN(earmn fPeiti etsr.3 schoolchildren. R ABU-KASSIM'n, N JAAFAR2. (Ministry of Health Perlis,K.J.s DenMtal andttueMLttsCRKON (Dpr fPe ti etsr,Malaysia'a and Dept. of Commnunity Dentistry University of Malaya?)Leedsot.atoalsuvysofdntl UK).rprtth Tealne ndmanexeieceuin teDNFCheeses are frequently recommended as snack foods which are safe for teeth. The aim of this study MostDnaionalsreysHofeed henta cariesreontmoiohervln eanhmangnepaterinceous ringtesDMtackwas toivsiaetedge10dmnrtstoo ua nmlsasatrepsr ofu when overall caries start to decline. Consequently, the impact of restorative policies to reduce thedifferent cheddar cheeses using the intra-oral cariogenicity test of Koulourides et al (1976). Four DMff index cannot he estimated. The aim of the study was: (I) to determine the caries experiencesorbitar cesoltos were used anthspsitiveyannliegai,blcontrosprespecndtiveyz. FIve adultos volnteers using the DMF index: and (2) to identify the predominant pattern of caries attack with a view tosorith la souinscore uswoed as lowiier reoablegappianewtvoeguecontosrsetvl.Fveredulhoumntenaels find the meet effective solution to reduce the mean DMF index in this population.with a DFS score>_ 1 2 wrea lowr removale applince wi hone gauzThevesadpleanconsistsheoftn64ec16-year-old8, Malayr- schoolchildrenchiinenPirlislistakenn fromm5slab (2mm x 3mm s 3mm) mounted on each aide in the buccal flange. A baseline surface randomly selected schools. Two schools were urban and 3 were rural. Clinical examination formicrohardness (SNIlH) test was performed for each enamel slab using a Knoop diamond with a IbOgcaisttu(D )anthpterofaisatckwercrddorahsbjt.Tem nload. Each volunteer was instructed to immerse the appliance in the test or control solutions for 10 DMriT wtats3.3(DM 3.0) and DMepater 5.1caisd 5.65). Thin mareconsdedfr edalo fordaT16-year-lmirts four times daily for a period of five days. tOg of the test cheeses were chewed by the pplto.Hwvr nyI~~ eecre-re lotalrsoaietetetneshdbevolunteers for 60 secs to obtain a cheese/saliva slurry which was used to cover the enamel slabs for mt(94) h igs otiuo oteDF ne a rmteFcmoet(2) hthe 10 mis immersion periods. SM}t testing was repeated after the five day test periods. The majority of the caries were concentrated on molair teeth (77.2%). More than two-thirds of the cariesmean±SD differenesn in SMvl} were: sucrose (+ve control) 21 .42±4.55g,s sorbitol (-ye control) - (67.5%) were exclusively occlusal caries. Almost 77%/ of the caries can be traced to a pit & fissuret.66±2.46ss; cheese slices 0.30_±1.95M;- cheese block 0.93±0.94I.s. cheese spread 2.34_±0.531A and origin. Moot of the restorations (87.3%) were simple (one surface) restorations. The moss commoncheese toyz 1 .44+0.79g. ANOVA and Tukey's test analysis showed that sucrose was significantly material used for restorations was amalgam (96.1%).(p<0.01) different to all the test cheeses and so the sorbitol (-ye control). The only difference Given this oattemn of caries attack. it is concluded that to reduce the DM.FT index in thisbetween the cheeses was for cheese spread versus cheese slices (p<0.05). In conclusion the cheeses oooulation, the beat stratem is to con-entrate on the Etrvention of Rit and fissure caries such astested showed low cariogenic potential and can be regarded an safe for teeth, anplvina fissure sealants to the molars within the first three years after eruption.3 Dental implant service in Hong Kong - demand and supply. 36 Denture Quality and Patleat Satisfaction in Elderly Chinese in Hong Kong.T.T. SHE*, E.C.M. LO (Faculty of Dentistry, The University of Hong H.C SHUM* and J.E. DYSON (Oral RehabIiHtatIon, Faculty of Dentistry,Kong) HKU).Dental implant has been shown to be successful and has become animportant treatment in the replacement of missing teeth. However, no information on Relatively litde infonmatios is availahle an the denture stasis and wearing hahits of the elderly (>65 yearthe provision of dental implant service in Hong Kong was available. The objectives of old) population in Hong Kong.this study were to describe the prevalence of dental implant treatment among Hong The aim of the present study wan to investigate the relationships hetween denture quality, denture vweaingKong adults, to find out the implant training received by dentists, and to compare thehaisndptetaifcioinhugu.characteristics of dentists who provided this treatment with those who did not. This 216 elderly individuals (64 male, 147 female) aged 65-96 (mean age 77) who possessd one or more partiastudy consisted of a mailed questionnaire survey of 160 randomly selected dentists or complete denture were inclnded in the study. tI of Sthese were resideeus of one of Sthn homses far shiein Hong Kong and a telephone survey of adult Chinese. 76 completed questionnaires aged, a furfther67 were attendees of one of two day care centres and Sthe rmnaining 68 were patients anendingwere returned by the dentists and 314 adults were interviewed. Only 16% of the the Reception und Primary Care Unit of Sthe Prince Philip Dental Hospitul. Hang Kong.interviewees had heard of dental implant though the percentage was higher in the Participants were questioned ahout Stheir satisfaction with sheir dentumes and she Periods far which sheyounger age and higher education groups. None of them had ever received dental dentsres were worn. Using oritmria adapted from previous authars (Rise 1978). Magnusson 1986, Vigildimln.Most respondent dentists had received some form of dental implant training 19871 the dentures were esamined wish respect to their eatension, stahility, retention, occlusal relationships.but their training varied a lot. One-quarter of them had provided some form of implant sraewa n mec fohrdfcstreatment to their patients. Proportionally more dentists who provided dental implant Overall, 37% were edentulous in hoSth jaws, and a further 24% were edentulous in one or other jaw. Thetreatment had received training involving real patients than dentists who did not. In remaining 39% hal some troth in bosh jaws.conclusion, the prevalence of dental implant treatment amono Hong Konagdlt a Alehough mass patients 162%l expreesed no complaint aheut their dentures, m-any of these hal relatioelyvery_low. Yet a significant percentage of Hong Kong dentists had provided or serious defects, particularly with respect to retention. Takise the grouan overall, Ratient satisfaction did notansea to he associated with the variables related to deantue quality excmR with We=et to *aw relatianship,Potentially can provide this treatment. However, when patinnt gender and age of the dentures were cansidered sonar significant relatonshipa werfound.37 TheProfile of Partial Denture Patients Attending an Academic Instituition. Design of a Self-eoataiaed Apparatus for Ate Turbine Handpieee Testing.S..eng' end P.L.Loh (Facufty of Dentistry, National University of Singapore) ~1W DRELsdJL DSN Dna aeil eee eOral Rehabilitation, Faculty of Deatiser, the University of Hung Kong,Patients who exhibit partial edentulism require the replacement of lost teeth to restore oral tunchon and Hong Kong)appearance. The type of patiente seen together wfth the clinical conditions they present would provideuseful inforrention to assist prosthodontic treatment planning. The aim of thin study was to obtain basic The longevity of dental air turbinie handpiece bearings has been of concemn for a long time, but withprosthesis in use, 310 clinical hospital denture patient records were randomly selected for the study. Therotnaucainnwthnrmhefusftisocrnboesaajreltonrtro.Adata collected were from clinical charts useed for removable prosthodontic dental atudent cases. The satisfactory miethod of testing for longevity in therefore necessary. The variables relevant so dentalfothewing related information were grouped together and extracted tar the atudy.11l Patient: lace fomw, air turbine hansdpiece testing have been identified by Dyson & Darvtell (1997). The measurementproathesis history, reasnos seeking treatment satisfaction at present prosthesis, denture hygiene status, 2) of these, however, required cumbersome and expensive equipment and involved an elahorate andOPG findings 31 Periodontal status. 41 Clinical Condftion: occlusal clsassifiation, alveolar ridges, abutmentteeth status, saddle replacements. The studied sample 1137 maie, 173 female), aged 1718o8 years old demanding technique. Thin approach, as such, would thus not be applicable in the dental surgery.preaented with face form distribution of oval 46,3%, square 32.8%, and tapering 20.8%. Patiente response Isis the present purpose so describe the design and implementation of a self-contained apparatus forto reason tsr making new prosthenis were poor funettee 151.5%), loose 138.9%l, and aesthetics 19-8%). the necessary measurements which can be operated simply and conveniendly. Meanhearinig50.3% complained at poor retention of fthir present denture whle 49.7% dat cot. Of the patients who had resistance and nmear stall torque (to a preision of 0 00I msNs). as well as continuous outpu of thewow previous dentures, 85% were acrylic type while 18% were made at chrome-cobalt base of which 60% - -showed poor denture hygiene, 87.5% of sample were natieled with the preseet occlusion and masticatorytaaeosvlsaraaibe,Rainl stonsrsledo150mmndfe inncefficiency. A general OGP survey showed only 7.3% having radio-opaque, radioluescent or mined type speed to ± I/sin isplayed, It will bathe subject of future work to establish specific teat protocolsfindinga Only 16% at abutment teeth exawinied showed slight mobtilty. Examination showed 86.8% with thr-ough the application of the procedure in areal service context. Theequipenentwill have a varietyupper and lower arches,37.4% of upper sod 61.1% at lower presented vAth 2 saddle spaces of which only o te plctosi tnad opinetsig eindvlpet n aneac hcs8.5% o1 upper and 28.8% lower had poor eidges. The studv showed that patient a tendins insttiuionalclinics came to replace dentures more for functional reasons and their aesthetic expectations were no This work was supported by The University of Hong Kong CRCG grant non. 335.250.0001 andhigh.Their teeh. serlodontal and denture conditiions were net optimeal and needed allention before 337.255.0002.commencement of eroathodontic treatment.The Discharge of Lubricant frees Dental Air Turbine Handlpieces. 4l DENTAL PATIENTS' RIGHTS IN HONG KONG39 S.M PONG* and JRE. DYSON (Oral Rehabilitation, Faculty of Dentistry, 40 C.W.T. LAM-, F.N.F. LEE, M.CM. WONG, J.K.S. LIUHKU). (THE UNIVERSITY OF HONG KONG)Aitnougn not welt recognized in standard texts, tuhnicant discharged from dental equipme-nt daring In Hong Kong, patients' rights and responsibilities became more concerned in recent years.restorative procedures may contaminate the fteld of operation and comprmise the results of handing Different authorities have proposed their patients' charters that were mainly related to thetechniques. The aim of the present study waw to report on she discharge of tnhricant from dental air saubine medical services. However, no related charter or guidelines han been made in dentistry.handpieee and todiscuss its ctinical significance is thiscontrex. This renearch aimed so study the knowledge of the public on patients' rights and the extent ofExperiment L. A marker dye (oil red) wan added to a standard tubricunt (KaVo Spray, KaVo, Genmany) the public in exercising their rights in dental servicen. A telephone survey was conductedwhich wan used to luhricate 4 examples of oar hrand of handpiece (Quietair, Midwest, Des Plainens, IL, with a structured questionnaire on Hong Kong Chinese aged 25-49 with dental experience.U.S.A.) according to the nmaufacturer's instructions. Each handpiame was then allowed to run an airat the A total of 1626 calls were made, of which 408 were eligible and 401 questiormaires weremanufacturers' recommnended pressure at a fixed distance and position over the paper of a chart recorder. cmltdeut hwdtn 7 ftersodnske tlat1 u f1 ihsOhservations were male of the oil discharged an to the chart aver adO0 minut perie.Reutehwedht6. fterspnet ne tlat 0oto 1 ihsExperimsent IL A second experimewnt wan unadertaken to measure the actnai amount of oil discharged aver However, 65% of the respondents had exercised at most 3 out of 12 rights. Is was found thiattime. One example of each of seven different madels of handpiece wan tested. Par this, e-ach handpiece wan thne more the respondent knew about his/her rights, the more he/she exercised them. Thedismantled, cteaned and flushed to remove lubricant from internal and external surfaces, dried and weighed. ratio between the number of rights known and the number of rights exercised wan aroundAfter standard luhrication using degpssed KaVo Speay, the handpiece wan reweighed. tt was then allowed to 1/3. A tignificant potitive association wasu found between education level and the knowledgee

Design of a self-contained apparatus for air turbine handpiece testing

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Design of a self-contained apparatus for air turbine handpiece testing

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