Fung, SC

Rodrigo, MRC

Yu, C

Journal of Dental Research

HKU Scholars Hub

Title Two patient controlled sedation techniques compared usingGraseby PCA pumpAuthor(s) Rodrigo, MRC; Fung, SC; Yu, CCitation11th Annual Scientific Meeting of the International Associationfor Dental Research (Southeast Asian Division), Jakarta,Indonesia, 4-5 October 1996, v. 76 n. 5, p. 1211Issued Date 1997URL http://hdl.handle.net/10722/57203Rights Creative Commons: Attribution 3.0 Hong Kong LicenseDent Res 76 (5) 1997 Divisional Abstracts: Souttheast Asian Division 1211Ridge Augmnentation and Reconstruction Usaing Compenite Bonse Grafts1 5 A.M. RABtIE(Department of Chslidren's Dentintry and Orthsodontics, The University ofHong Kong.)he sarp~os-e of ttke scurerst presenataion is to introduce the composite aulognouss buns graft and demineralizedlbone matrix to the practising clinician. In this presentation, the biochemical and molecular advatices leaing toette develu-Tment of the comeposite bone graft are highlighted stsd the different aspects of its clinical applicatiotsare demonstrated.-T'he composilc buns grafl is a isitxture of autogensus buns (tht; paticsts's own hose) aned allogemec demiineralizerdbone msatrix (DBM) (prepared frost hiusan cadaver boet or commnercially available). Recently we reported thatthe dcltnineralized bans matirix asgaisetled tbe healin and integration of autogenous bone grafts. The compositebonie graft induced 47% mroes new bone than the moss widely used grft material,, the EC. bone. In tshecomposite graft, she typ of astogenous bone, ettedochsondral (EC) of origin i-c hip I rib bose graft orintransembraaous (INS of origin i-e cranial / chin buns graft, affects the integration of sthe graft with bhe rcctpicntbed. Composite IM-t)BM induced earlier neovascularization when compared with EC-DBM. Furthiermore, usultra.strucsural identiftcationi of cello involved in the lseaing of IM and EC bose demonstTated thatintransembranousa butte, utsltke EC boone, heals directly through boone bypaaaing a cartilage intermrediate stage.ClinLically. implants were tinersed within 3.4 montha afteuridge aumentrnarioa rsting the roystitote boae graft.Similarly, in cas-es of muandibular and maxcilary rerresiutrction iisiplants were imqerled within 3-4 months.In conclusions: IM bncie heals thirouLh an ttos i ruewhich allows earlier loading of the grafted ares. IM-BOM induce early vaesularization which is vital to the boss inducto ablt fsIecogsiogaCoMossite banesterafts vasest alt the peoperties r;guired foe an effective seafl. snat risl and meeis furthecr clisicatevaluatiostThis study was supporiedt by RCG Grast N 335/251/0023, Usiversity of Hsng Kong.Two Patient Controlled Sedatios Techaiquses Compared using Graseby PCA Punap.17 M.R.C. RODRIGOO, S.C. FLNNG and C. YU (Department of Oral and MaxilofacialSurgery, Faculty of Dentistry. University of Hung Koag).to a preliminary investigationa, true patiest costTouled sedation wlhere patients obtain 0.1 mg increments ofmeidazolam without a lockout period was comupared wish she standard patient controlled technique wherethey obtain 1 mag increments of tsidazrslam witht a lockout period oftI minute hetween increments. Eightemhealthy patients undergoing bilateral thitd molar surgery as two visits were included in she study followinginformed consent. The total dose of Lisdazolaul obstabsed by patients sptn the end of surgery wassignificantly less with the tnte patienit coitti-olcd technique, meait 4.1 nag, when comparedMwth thestandard technique, mean 5.2 siig (p<0.05). During true patient costrolied sedation the num-ber ofdemanadsfor the drug far exceeded ttte incremetits tttey received. In both groups she majority ofpatienatsweromoderately sedated and provided good operating conditions. One patient in the true patient controlledsedntion group was considered so its niarkedly sedated. Almnost an equal number preferred each techsniquse.The majority (71%) who preferred tIre true patient coattroUted sedation technique said they could controlthe sedation helter with this techsuiqtue aidttesitetajority (56%) who preferred the standard technique eadsthate adequate sedation wais attanied miuch earlier than wish the other technique. Thus the conclusions atthis- greliminaty investigations are that Itte so cslled true patiens controlled sedation in a tnisnom.eebecautesztou.llsthg.ssp.tientsaare able to press..LhbLhtttOs at anytinetbteyvwiLt. tey do notg ateanincrement atcyr ietiypestebto n titeeiwtitu ain otoe sedaiogn patients could beaseoesaekq.dy.aedate-d or may evrtt become sauconsurions IThis stresses the importance of having twopractitioners otte so monLitor the patiettt atid she other so perform surgery whet patients are allowed to haveisncresments duiring surgery its p~atient controlled sedation.Evluaion of Flexural Strength of Matorials for AllI-Ceramric Restorations.19K KANCANATAEWAT'R. GIORDANO 1t R. POBER and D.NATHANSON, (Chulalongkorna Univ., Thailand and Boston University, USA.).All-caramic restorations are increasingly usod duo to thotr often superior esthetic qualities.Ceiny (Mukrona Technologie), [PS-Empress (Ivoctor) and Coroc (Siemens) are novel systemswhich can produce a vartety of ceramic resorations. Colay uses a precise copy milltng system,Cerec is a CADICAMV system while Empress employs a pressure molding fabrication technique.This study investigated the flexural strength of the different typos of cornamic used in thesesystems. The ceramics used are; Type 1) Ahuminous porcelain (Vitadur Alpha, Vita Zahnfabrtk);,Type 2) Dicor-MGC (Dentsply); Type 3) Vitablocs (Vita Zahnfabrik); Type 4) IPS-Empress; Type5) In-Ceramn blocks (Vita Zahnfabrik); and Typo 6) Spinell blocks (Vita Zahnfabrik). Type 3, 5, 6are specially designed for Com'y machine. 10 bars (2.0 x 1.50 x 25 mm) of each type werefabricated. Bars were tested in three-point fleaxure (crosshead speed 0.2 mrrmimn) on auniversal testing machine (Instron, Canton. MA, USA), according to ASTM Standard C.1161-90. Flexural strengths (X ± SD, MPa) are; Type 1) 64.92 ± 10.32, Type 2) 231 99 ±17.88. Type 3) 119.04 ± 4.13, Type 4) 98.30 ± 14.00. Type 5) 384.50 ±t 40.01. and Type 6)259.10 ± 31.49. ANOVA and Tukey statistical analyses revealed that In-Ceram was thestrongest (p .! 0.05) ceramic tested and Vitadur Alpha has the towest flexural strength (p s0.05). Spinoll was the next strongest (p!5 0.05) one. There was no sigqnificant difference to~~g(g5g~n~~tahlocanVtabosandObewee DiorM GCard Sinell21 Efbto lnnccigott the Fintuese Touglhness of Composites. NIl AbuKsim andof Newcastle upon Tysse, UKFracture touighness has bees recogeiised to b esite elite snass ittsportaits tmechanical property for restorativemtaterials. Itsis the aim of this study to tttvestigait: tim effecct of tlternmocycling an fracture touglincss-ofarange of dental composites, PSO(P)'. Silux Pltis(S) ~,Hiliomolar(H)3,Clearfil Photo Posterior-liglst4nthdspcnciactivated(CI.A) sand Clearfit Posterior-chemically asctivated(CC) I110 reetangular preeothdsetetwas prepared forseach material utilising a staittless steel mould. Thec speciinens were divided into I1I grosps oftO each. Teat groups 1-i mere subjected so I, 250, 505, 750, 1000 and 10,000 thermal eyelet respectively.Each cycle commusted of Imit imnmersion tttae of50 uccoeides per chaujge. Thse control grosps 7-1 were storedan water as 37uC for a time eqtiivaleoit to complete 255. 500, 7505. 000 and 10,000 thermal cyclesrespectively. All specinsens were subjected to a 3 potast bead teat and loaded as a crosshead speed of tatitmt05ntona lassros Testing NIacliitte. Tte frncisre sougless ostall iiuterials decreass wish the number o1Itermnal cycles and leitgtht of svater storage exeept for CC wlhere the fractsre tougbsitss isicreases during Itseearlier suagas of theramoeycliig atid water stor-age. H-owvever the assess fracture toughtisns values wore forgrasps 6 anod It1. One way atialysis of variance slitowned tiatu Grosp wons signifteuntly different from groups 6snd I I (P <.05). the thermally cycled asld the water storage groups wet-c taot different from each uslher fur alltnaserials. T'he decrease in fracture toughiiests exhibited by sit ligilt aciLvated contposites could in explaiiiedby initerfacial stress formstion sand resin-rtller deboiiditsg while the increase in frasture tooughness during theearlier stages of thermoecycltigs astid sater storage of chemically-activated composite be explained bycontlitued polymerisatison. 31Themwcyclingo did ngt gnsea nny 5i1,iifiranit reduCtoit. is fracture totirhnersscoLanpSites sov ernd aheve hb' watser utIsMr.3M.MN, 2. Vivadettt. Lieclittenstets, 3. Ktirary. JsattiVascular endothelial growth pattern of composite intramembranous bone and16 demineralized bone matrix.Y.M. DENG*, P.C. Wu 2and A.M. RABIE ' (Dept. of Children's Dentistrv &Orthodonfics and Dept. of Pathology 2, The University of Honig Kong).The purpose of this study was to clarify the angiogeneic pastern in the early stages of healingof composite intramemnbranous (TM) and d.-mineralized endochondral bone matrix (DBM).Fourteen critical-size 10 x 5 mm,full thickness bony defects were created in the parietal bonesof maturerabbits. Defects were filled with combined IM-DBM. Tissues were retrieved in 1,2,3,4, 5,6 and 7 days posts grafting. Neovascularization was assessed using antibodies so factorVill antigen (marker for vascular endotheliunm) and gan-endothelial antibody (CD-31).Histological and immunohistochemicalt evaluation of the sequence of the events revealed that:two days after grafting, positive staining for endothelial cells were firest observed near theperiphery of the host bone rimi. Small blood vessels were first seecn budding, from host bedtowards the graft by day 3. At gay 4, differentiating chondroblasts were observed. Witli theadvent of capillary invasion on day 6, initial signs of osteogencsis was observed and newbone was formed on the surface of cartilage mnatrix and she implanted miatrix by day 7. Inconclusion: this study dejpnsonteatcs a rapid vascularizationi during the composite tM-DBMgraft induced osteogenesis and p2rovides a further evide,nce for the potential value of thecomposite graftThisl study wkas supported by the CRGC granit 335/251/0023, The University of Hong Kong.1 B LINtCAL EFFtCACY OF MIETAMIIZOL IN PAIN AFTER StJRGICAL18 ~~~REMIOVAL OF IIMPACTED WISDOM TOOTH-~~~~~H.Scelistiono *l PAbdul ;~CthinttSri louryawati" antd udiono 5=antuasa"*Dept. Oral Sirgery ** tDept. Clinical Pharmacology,Sadjah I'lads L.fniv., Yogyak.artaTrhin randlomaized doubts btinid placebo controlted tract w-an untiertoluento inivestigate the efficacy and tolerabitity of netessizoL 500 nug,mefenamic acid 500 mg, ibuprof en 400mg.. Two hundred and thiirty ninepatients were admitted to the study, but onily two hundred and ninepatients were inicluded en thu final analysis clue to protoceslvieolation. They consaisted of 51 patients receiving met.amizol, 54patients receiving mefenantir.c acid, 54 patients receiving ibuprotfenanid 50 patieentn receiva.tng placebo. Efficacy wow assesuseui bas,ed an. 5point scale measurametit of pean intensity and pain relief, every houArduring 0 houir per-iod fotlowin-g siurgery. The resuults showed that theorewanz no differunice in pain intensity atiic pain relief between gjroupa..However, signifirant clifferences between eithier ditr g raruta wereobserved as compare to placebn, indls:at.tng there analgesic hetf.itaiy.i'hi adverse events,i during the treatment pwriod were flint *aitgnificantlydif forencoon between rjrsaUupw. It was tconclujded, rlherefrare, thlatmetamizote 500 ng, mefenomic acid 5tA mg and ibuprofen 400mng, wer-eequially efficat:itus; for the croactment o-f oental pain aftei- surgicalremoival imipastuwd wiu,icom tton:t..Effect of storage condition on mechanical properties of composite resin.20 S. MEIANA*, M. YAN, K. TONAMI, N. HABU, H. TAKAAHASHI and-IF,.1l. NISHIMURA (Tokyo Medical and Dental University, Tokyo, Japan).ibs study was conducted to confirm the effect of storage condition on mechanicalproperties of composite resins. Three light-activated (CH,ZI,HM) and one chemically-cured(CN) comnposite resins were selected and tested insmsediately after being received from theirmnsaufactuarers (control) atad after6 essntls storage at 4'C or30'C. Knoop hardness (KH) ofcured composite surface was measured 3 minutes after light exposure or 10 m-inutes afterndxture; direct tensile strength (DTS) was measured isting dutsibell.-nhape specimfen after 24hours stomage in 37 'C distilled water. Means (s.d.) are sunurneized in table betow and wereanalyzed with one-way ANOVA and Scheffrs lest (p'c0.05).KH (KHN) controt 4'C 30'C DTS (MPa) control 4C 30'CCH 19.7 (0.6) 20.8 (1.7) 21.6 (2.1) 66.9 ( 7.9) 62.9 ( 6.6) 60.4 (7.9)Zt 69.6 (2.1) 61.3 (5.2) 63.9 (5.0) gg.0 (11.2) 67.6 (12.3) 65.0 (6.8)HM 17.4 (0.5) 17.5 (1.7) 16.1 (2.1) 59.8 ( 4.9) 57.4 ( 3.5) 52.7 (g.4)CN 53.4 (5.0) 34.1 (4.1) 13.0 (Ig8) 69.6 ( 5.3) 70.3 ( 4.2) 62.2 (7.2)KH ofCH and MlM did not show significant difference among storage conditions,while thatof ZI(4'C) and CN(4'Cand30'Q)decreased after 6 tnxonths storage. M)st of ZI.HMl.and CNdecreased after 6 months storage, especially as 30'C. These resultts suggested that storageconditionB, even for only 6 months, affected mechanical properties of compositereis22 Comaainp is of Four -Microeinkage Tracer.M2NA. ANGELA 0.GONZALEZ (Conservative Depamnarnt, Faculty of Dentistry, University ofMalaya, Kuasta Lunpur, Mialaysia).Theree is an assumption that different inicroleakcage testu would yield sirntinr resuLts when used to determnineleakcage of the- stuns restorative masterial. This in vitm stuy compared the ability of four differet acers so detectmaicrolcakage of amalgam restoratiosm, using the same experimental methodology. Class V amalgamn wereminsred at extracted human sasth, thent stared in matter for two weet-s at 371C. Within thin persod. they warssubjected to 2500 thermal cycles at a 40'C tempereatre differsasat Itieroicakuage was tested at the end of theenroge period. Fiftee teeth were randomly assigned to one of four test groups: (A) 0.5 per-cenr basic fachsin dye.(012.5 percent fluorescemt dye, (C) 1.3 percent reactive orange 14, sand (D) 45Ca. Microleakage wans examincd atboth the ersicaL and occlusat macgist. The Nesemen-Keels tess was used for miutiple compsnaoan of theindividual atacers. There, was signifucanr differnene in the degree of leakage irdicsted by the four tamscn (p'-0.051, exeepLt0r oneinstanc. Only 4SCa aidtdue luorcsceardje (Zysto) indicated thestamedegree oflakttge atthus gingivul margin. The 0.5 percent basic fiuchaun. dye indicated the greatest amount of leakage followed indescending order by reac-tive orange 14. 4OCa end the hisurescest dye. The reactive orange 14 was difficult toevaluate because of its caine, malting the reliability of scores questionable. With respect to the tluorescent dye.this was sometimes apparent alotis she ax-ial walls but not as theeocclusal or gingival margins. Thus, the stoure ofleukaesg was not distensible.Overall, the nosunt ofthis astudy indicate that the resalts of leakage studies bhar have utilized different tracesshould roathse compared.I

Two patient controlled sedation techniques compared using Graseby PCA pump

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Two patient controlled sedation techniques compared using Graseby PCA pump

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