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RETENTION of a POSTERIOR RESIN-BONDED Flxed PARTIAL DENTURE Wlth a Modlfled DESIGN - an in Vltro STUDY

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RETENTION of a POSTERIOR RESIN-BONDED Flxed PARTIAL DENTURE Wlth a Modlfled DESIGN - an in Vltro STUDY RETENTION OF A POSTERIOR RESIN-BONDED FlXED PARTIAL DENTURE WlTH A MODlFlED DESIGN - AN IN VlTRO STUDY. Marcia Helena Marangoni Rubo A thesis submitted in conformity with the requirements for the degree of Master of Science Graduate Department of Dentistry University of Toronto O Copyright by Marcia Helena Marangoni Rubo 1998 National übrary Bibliothèque nationale du Canada Acquisitions and Acquisitions et Bibliographie Services services bibliographiques 395 Wellington Street 395. rue Wellington OttawaON K1AW OttawaON K1AW Canada Canada The author has granted a non- L'auteur a accordé une licence non exclusive licence allowing the exclusive permettant a la National Library of Canada to Bibliothèque nationale du Canada de reproduce, loan, distriiute or sell reproduire, prêter, distribuer ou copies of this thesis in microfom, vendre des copies de cette thèse sous papa or electronic formats. la forme de miaofiche/nlm, de reproduction sur papier ou sur format électronique. The author retains ownership of the L'auteur conserve la propriété du copyright in this thesis. Neither the droit d'auteur qui protège cette thèse. thesis nor substantial extracts fiom it Ni la thèse ni des extraits substantiels may be printed or otherwise de celle-ci ne doivent être imprimés reproduced without the author's ou autrement reproduits sans son permission. autorisation. Retention of a Posterior ResinBonded Fixed Partial Denture with a Modified Design - an in vitro study. Marcia Helena Marangoni Rubo Degree of Master of Science Graduate Department of Dentistry University of Toronto 1998 Abstract ln vitro retention of a RBFPD made wlh a modified design (MD) was compared to that of a curent design (CD) using five experimental groups (G). G1 (CD) included proximal grooves (PG), occlusal rests (OR) and lingual wings (LW). G2 and G3 (MD) were similar to G1 however PG were replaced with retentive slots (SL). G4 had only SL. G5 had OR, LW and non-retentive Si. Air abraded castings (nonprecious alloy) were cemented with Cernent-lt (G1,G2. G4 and G5) and Panavia 21 (G3).Following storage (7d), prostheses were subjected to compressive load cycling and then separated in tension. Mean separation forces in N were: G1: 360.9 - G2: 525.4 - G3: 562.2 - G4: 448.6 - G5: 417.1 Statistical analysis showed that G1 and G5 had separation values significantly lower than the value achieved for G2 and G3. lt is concluded that the added means of retention significantly increased RBFPD resistance to dislodgement. Acknowledgements I would like to thank my supervisor Dr. Omar M. ECMowafy for many hours spent in supervision of this work and review of this manuscript. His patience, guidance and support through the entirety of this project was greatly appreciated. Dr. Dorothy McCornb and Dr. George A. Zarb. members of my thesis cornmittee, are also thanked for taking the tirne to evaluate, criticise and make suggestions. which were incorporateci in this thesis. I am grateful to Mr. Chtistopher A. Pereira for his technical assistance in the execution of both fatigue and tensile tests. Mechanical testing was conducted at the Centre of Biomaterials-University of Toronto and at the Department of Biomaterials- Faculty of Dentistry. 1 would like to thank the individuals in charge of these departrnents for allowing me to use the testing equipment. This study was supported by a Faculty of Dentistry research grant, a grant from Synca - Canada and a grant from CAPES (Brazilian Ministry of Education Agency). Finally, I dedicate this thesis to my husband Jose and rny daughter Leticia for al1 their love, encouragement and support during the length of this course. Table of Contents Abstract............................................................................................................................... ii ... Acknowledgements........................................................................................................... III Table of Contents ..............................................................................................................iv Table of Figures ...............................................................................................................vii List of Tables ......................................................................................................................x List of Appendices ............................................................................................................xi Chapter 1 . Introduction ..................................................................................................... 7 1 . OVERVIEW....................................................................................................................... 1 7.7. Advantages of resin-bonded fixed partial dentures .................................................... 2 7.2. Disadvantages of resin-bonded fixed parfial dentures............................................... 2 7.3. Evolution of resin-bonded fixed partial dentures ........................................................ 3 2 . DEVELOPMENTSIN SURFACE TREATMENT OF THE METAL...................................................... 4 2.1. Electrolytc etching technique ..................................... ... ............................................ 5 2.2. Alternatives to the electrolytic etching technique ....................................................... 6 3 . DEVELOPMENTOF SPECIALADHESIVE RESINS .................................................................... 11 4 . DEVELOPMENTSIN DESIGN ................................................................................................ 15 4.7. The need for tooth reduction .............................................................................. 75 4.2. The use of grooves .................................................................................................. 77 4.3. Alternative designs ...................................... .. ......................................................... 7 8 5. FACTORSAFFECTING LONGEVITYOF RBFPDs ................................................................... 22 6 . LONGNIW OF RBFPDs ................................................................................................... 25 7. CONCLUSION.................................................................................................................... 35 Chapter 2 . Materials and Methods ................................................................................. 37 1 . PILOTSTUDY .................................................................................................................... 37 7.1. Preparing the specimens ......................................................................................... 37 1.2. Preparing the teetb ....................... ... ................................................................... 42 1.2.1. SP 1 - curent design ........................................................................................ 42 1.2.2. SP 2 - modified design for RBFPD .................................................................... 44 1.2.3. SP 3 - conventional fixed parüal denture ........................................................... 45 1.2.4. SP 4 - RBFPD with only proximal slot preparations ................... .. ................. 45 1.3. Impression ..................... ... ........................................**.*......................*............. -46 7.4. Casting ................... .... ........................................................................................ 48 1.5. Metal surface treatment .......................................................................................... 49 1.6. Cementation ........................................................................................................... -50 1.6.1. Cementation procedures for SP 1 .....................................................................50 1.6.2. Cementation procedures for SP 2 .................................................................... 50 1.6.3. Cernentation procedures for SP 3 ..................................................................... 51 1.6.4. Cernentation procedures for SP 4 ..................................................................... 52 1.7. Fatigue test ............................................................................................................. -52 1.8. Tensile test .............................................................................................................. 55 2 . MAINSTUDY ................................................................................................................... 57 2.7. Prepanng the teeth ................................................................................................. -58 2.2. Impression ............................................................................................................... 60 2.3. Casting .................................................................................................................... 60 2.4. Cementation ................................. ,,.- ................................................................ -67 2.5. Fatigue test .............................................................................................................. 62 2.6. Tensile test .............................................................................................................. 62 2.7. Analyzing the mode of failure .............................................................................. -63 2.8. Measuring
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