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P 91 Title 3D ANALySIS OF MICROSTRuCTuRE AND HERTzIAN INDENTATION FALIuRE IN GLASS IONOMER Authors C. DObO-NAGy 1 , P. NAGy 1 , G.A. CHASSE 2 , P. FEJERDy 3 , I.G. CSIzMADIA 1 , E. FARAGO 1 , T. KuN 1 Affiliations 1 Dept. of Oral Diagnostics, Semmelweis University, Budapest, HUNGARY, 2 Queen Mary, London University, London, UNITED KINGDOM, 3 Dept. of Prosthodontics, Semmelweis University, Budapest, HUNGARY Body Objectives: The aim of this study was to assess the role of X-ray micro tomography (µCT) on fractography. Materials: Discs of biocompatible glass ionomer cements (GIC) were prepared for Hertzian indentation and subsequent fracture analyses. Specifically 0.2×1 mm samples for reproducing bottom-initiated radial fracture, complemented for 2µm cubic voxel size optimal resolution µCT analysis. Nanocomputed tomography analyses supported the reliability of the µCT results. Complementary 2-dimensional fractographic investigation was carried out by optical and scanning electron microscopies, identifying fracture characteristics. Results: The µCT analysis (CTAn software, Skyscan) delivered Pore Volume (10-5mm3), Porosity (%), Pore Surface / Volume Ratio (103mm-1), Pore Thickness (µm) measurements the difference between the top layer value and bottom layer value was statistically significant at P=0.05 3D analysis of GIC samples allowed fracture branching and incomplete bottom-initiated cracking to be accurately determined. Specifically, cracks grew to link pores while propagating along glass-matrix interfaces. Conclusion: The methodological development herein is exploitable on related biomaterials and represents a new tool for the rational characterisation, optimisation and design of novel materials for clinical service. Keywords glass ionomer cements,fractography,microCT 206
P 92 Title DOSIMETRy OF uPPER STANDARD DIGITAL OCCLuSAL RADIOGRAPHy Authors J. DAVIES 1 , D. DARIOS 2 Affiliations 1 Kings College London Dental Institute, London, UNITED KINGDOM, 2 Medical Physics Department, Guys Hospital, London, UNITED KINGDOM Body Objective: The aim of this study was to investigate the effects of a thyroid shield and X-ray beam collimation (circular/ rectangular) on the effective dose when taking the upper standard occlusal radiograph. Methods: Experiments were performed using a tissue-equivalent RANDO head phantom and dental x-ray tube (60 kVp, 7 mA and 0.25 s) at a 65° downwards angulated beam. The absorbed dose to various sensitive organs was measured at 24 different positions with thermoluminescent dosimeters and the effective dose was determined using the tissue weighting factors from the 2007 ICRP recommendations. Each individual radiographic exposure was repeated 10 times and each experimental method was repeated twice. Results: Using circular collimation the mean effective dose was 0.93 µSv ±30% (E2007), adding a thyroid shield the dose decreased to 0.61 µSv ±30% (E2007). Utilising a rectangular collimator the mean effective dose was 0.68 µSv ±30% (E2007), adding a thyroid shield the mean effective dose decreased to 0.41 µSv ±30% (E2007). The absorbed dose to the thyroid is reduced by approximately 50% when using a thyroid shield, from 13.4 mGy to 6.7 mGy when using circular collimation and from 10.0 mGy to 3.8 mGy when using a rectangular collimator. Conclusion: The effective dose and absorbed dose to radiossensitive organs such as the thyroid gland can be reduced significantly when using rectangular collimation and a thyroid collar which is in keeping with the ICRP recommendations of optimisation and dose limitation. Keywords Dental Radiography,Thermoluminescent Dosimetry,Radiation Dosimetry POSTerS 207
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Program Overview Wednesday 13.06.20
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IMPORTANT NOTES Registration desk -
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CV Prof. Dr. med Rüdiger Lessig bo
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CV Dr. Martin Surbeck 1996-2002 Stu
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Thursday, 14.06.2012 | Main lecture
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Thursday, 14.06.2012 | Second lectu
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CV Franz Pfeiffer Age 38, born 25th
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CV Prof. Dr. bodo Kress 28th Septem
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Friday, 15.06.2012 | Main lecture h
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Friday, 15.06.2012 | Second lecture
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Saturday, 16.06.2012 | Main lecture
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14.06.2012 | 09.00 - 17.00 | Poster
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p 34 G. aKciceK, S. aKSOY, K. Orhan
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p 67 K. GunduZ, P. celenK, h. aVSeV
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p 102 a. aSSaF, B. Kahl-nieKe, J. F
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OP 11 Title DEVELOPMENT OF THE SEDE
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OP 13 Title THE TRIAL OF REDuCING D
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OP 15 Title CbCT IMAGE ARTIFACTS RE
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OP 17 Title METAL ARTIFACT REDuCTIO
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OP 22 Title DENTAL AGE ESTIMATION A
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OP 24 Title A CEPHALOMETRIC MICROCO
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OP 26 Title CANINE ANGuLATION IN PA
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OP 31 Title ACCuRACy OF CbCT IN DET
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OP 33 Title GAIN OF INFORMATION ON
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OP 35 Title CONE-bEAM COMPuTED TOMO
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OP 41 Title CAPAbILITy OF ADIPOSE D
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OP 43 Title THE APPLICATIONS AND uS
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OP 45 Title MEASuREMENTS OF THE FOR
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OP 47 Title IR(ME)R REGuLATIONS:COM
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OP 52 Title EVALuATION OF THE PHySI
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OP 54 Title THE DESIGN OF FFT FILTE
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OP 56 Title CbCT REFORMATTED PANORA
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OP 61 Title RELIAbILITy OF VOXEL GR
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OP 63 Title CORRELATION OF MANDIbuL
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OP 65 Title ASSESSING bONE THICKNES
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OP 67 Title DOSIMETRy OF THREE CbCT
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OP 72 Title PANORAMIC RADIOGRAPHy.
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OP 74 Title RADIOGRAPHIC ANALySIS O
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OP 82 Title DENTAL RADIOGRAPHy IN G
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OP 84 Title ECONOMIC EVALuATION IN
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OP 92 Title uLTRASONOGRAPHy OF MAJO
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OP 94 Title INFLuENCE OF THE REMNAN
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OP 96 Title INTRODuCTION TO uLTRASO
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OP 101 Title INTERNET bASED RADIO-A
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OP 103 Title ASSESSMENT OF ROOT CAN
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OP 105 Title CALCIFICATIONS IN CARO
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OP 107 Title DOSE REDuCTION IN PANO
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OP 112 Title AuDIT OF RADIOGRAPHIC
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OP 121 Title OPPORTuNITIES OF IMAGE
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OP 123 Title SEGMENTATION OF TRAbEC
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OP 132 Title WHICH THERAPEuTIC SIGN
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OP 134 Title 3T-MRI FOR THE EVALuAT
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OP 136 Title OSSEOuS AbNORMALITIES
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OP 141 Title GEOMETRIC ACCuRCy OF C
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OP 143 Title EFFECT OF ENHANCEMENT
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OP 145 Title CONE-bEAM COMPuTED TOM
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OP 147 Title PREVALENCE OF INCIDENT
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P 1 Title DENTAL STuDENT PERCEPTION
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P 3 Title DIAGNOSIS OF IMPACTED TEE
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P 5 Title MANDIbLE PERFORATION WITH
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P 7 Title ORAL&MAXILLOFACIAL TuMORS
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P 9 Title ELIMINATION OF DIAGNOSTIC
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P 11 Title FREQuENCy,CHARACTERISTIC
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P 13 Title ASSESSMENT OF ALVEOLAR b
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P 15 Title CONE bEAM CT REVEALING H
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P 17 Title FRACTAL DIMENSION ANALyS
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P 19 Title EFFECTS OF MANDIbuLAR AD
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P 21 Title COMPARISON OF FAT SuPPRE
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P 23 Title PANORAMIC VERSuS CbCT IM
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P 25 Title EFFECTIVENESS OF THE SIM
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P 27 Title ARTIFACTS IN CbCT CAuSED
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P 29 Title DIGITAL RADIOGRAPy EVALu
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P 31 Title DENTAL IMPLANT SITES MIC
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P 33 Title SIALOENDOSCOPy FOR SIALO
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P 35 Title uNDIFFERENTIATED SPONDyL
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P 37 Title EVAuLATION OF SOFT TISSu
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P 39 Title EFFECT OF TubE CuRRENT O
Page 156 and 157: P 41 Title zOLEDRONIC ACID AND RADI
Page 158 and 159: P 43 Title THE DOSES ACCORDING TO T
Page 160 and 161: P 45 Title MAXILLARy bONE IN FEMALE
Page 162 and 163: P 47 Title uSEFuLNESS OF IDEAL IN O
Page 164 and 165: P 49 Title DESCRIPTION OF REFERRAL
Page 166 and 167: P 51 Title ADJACENT TRANSCRESTAL SI
Page 168 and 169: P 53 Title MuLTIPLE bROWN TuMORS OF
Page 170 and 171: P 55 Title ARE WE SEEING THE WHOLE
Page 172 and 173: P 57 Title DENSITOMETRIC STuDIy ON
Page 174 and 175: P 59 Title RADIOLOGICAL ASSESSMENT
Page 176 and 177: P 61 Title COMPARISON OF D AND F SP
Page 178 and 179: P 63 Title ASSESSMENT OF TRAbECuLAR
Page 180 and 181: P 65 Title DISK MORPHOLOGy CHANGES
Page 182 and 183: P 67 Title THE INFLuENCE OF DIFFERE
Page 184 and 185: P 69 Title A RETROSPECTIVE STuDy OF
Page 186 and 187: P 71 Title CAN PTERyGOID PLATE ASyM
Page 188 and 189: P 73 Title CONE bEAM COMPuTED TOMOG
Page 190 and 191: P 75 Title NORMAL FACIAL ASyMMETRy
Page 192 and 193: P 77 Title COMPARISON OF HARD TISSu
Page 194 and 195: P 79 Title CbCT IN THE EVALuATION O
Page 196 and 197: P 81 Title KNOWLEDGE OF PANORAMIC A
Page 198 and 199: P 83 Title IS MEASuREMENT OF LENGHT
Page 200 and 201: P 85 Title bENIGN CEMENTObLASTOMA:
Page 202 and 203: P 87 Title GIANT SIALOLITH OF THE S
Page 204 and 205: P 89 Title INCIDENTAL FINDINGS ON O
Page 208 and 209: P 93 Title DIAGNOSTIC VALuE OF CONE
Page 210 and 211: P 95 Title EFFECT OF LOW-INTENSITy
Page 212 and 213: P 97 Title EVALuATION OF PANORAMIC
Page 214 and 215: P 99 Title RELATIONSHIP bETWEEN TON
Page 216 and 217: P 101 Title EVALuATION OF PANORAMIC
Page 218 and 219: P 103 Title AGE RELATED OSTEOPOROTI
Page 220 and 221: P 105 Title OSSEOuS AbNORMALITIES O
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