The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns
Identifieur interne : 000A39 ( Pmc/Checkpoint ); précédent : 000A38; suivant : 000A40The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns
Auteurs : Reza Derafshi [Iran] ; Mitra Farzin [Iran] ; Masoumeh Taghva [Iran] ; Hossein Heidary [Iran] ; Berivan Atashkar [Iran]Source :
- Journal of Dentistry [ 2345-6485 ] ; 2015.
Abstract
One disadvantage of cement-retained crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of cement-retained restoration and using porcelain stain to define this area.
This study aimed to evaluate the influence of existence of screw access hole on porcelain fracture resistance of metal-ceramic implant-supported crowns.
Thirty six standardized metal-ceramic crowns were fabricated and divided into 3 groups (n=12); group 1 conventional cement-retained metal-ceramic crowns as control group, group 2 cement-retained MC crowns in which porcelain stain was used to define the location of screw access channel, and group 3 cement-retained metal-ceramic crowns in the metal substructure of which a hole and ledge was designed in the location of screw access channel. The specimens were cemented (TempBond, Kerr) to their dedicated abutments. A hole was made in the location of screw access channel in group 2 and 3 and filled with photo-polymerized composite resin (3M; ESPE). All specimens were thermocycled and loaded in universal testing machine at crosshead speed of 2mm/min until fracture. Mean values of load at fracture were calculated in each group and compared with One-way ANOVA (α=0.05).
Mean value of the load required to fracture the restorations was 1947±487 N in group 1, 1927±539 N in group 2, and 2170±738 N in group 3. No statistically significant difference was found between the fracture resistance values of the three groups (
Presence of screw access channel in cement-retained implant restorations does not compromise fracture resistance.
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PubMed: 26106637
PubMed Central: 4476119
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns</title><author><name sortKey="Derafshi, Reza" sort="Derafshi, Reza" uniqKey="Derafshi R" first="Reza" last="Derafshi">Reza Derafshi</name><affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Farzin, Mitra" sort="Farzin, Mitra" uniqKey="Farzin M" first="Mitra" last="Farzin">Mitra Farzin</name><affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Taghva, Masoumeh" sort="Taghva, Masoumeh" uniqKey="Taghva M" first="Masoumeh" last="Taghva">Masoumeh Taghva</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Heidary, Hossein" sort="Heidary, Hossein" uniqKey="Heidary H" first="Hossein" last="Heidary">Hossein Heidary</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Atashkar, Berivan" sort="Atashkar, Berivan" uniqKey="Atashkar B" first="Berivan" last="Atashkar">Berivan Atashkar</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, 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sortKey="Derafshi, Reza" sort="Derafshi, Reza" uniqKey="Derafshi R" first="Reza" last="Derafshi">Reza Derafshi</name><affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Farzin, Mitra" sort="Farzin, Mitra" uniqKey="Farzin M" first="Mitra" last="Farzin">Mitra Farzin</name><affiliation wicri:level="1"><nlm:aff id="aff1">Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Taghva, Masoumeh" sort="Taghva, Masoumeh" uniqKey="Taghva M" first="Masoumeh" last="Taghva">Masoumeh Taghva</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Heidary, Hossein" sort="Heidary, Hossein" uniqKey="Heidary H" first="Hossein" last="Heidary">Hossein Heidary</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Atashkar, Berivan" sort="Atashkar, Berivan" uniqKey="Atashkar B" first="Berivan" last="Atashkar">Berivan Atashkar</name><affiliation wicri:level="1"><nlm:aff id="aff2">Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author></analytic><series><title level="j">Journal of Dentistry</title><idno type="ISSN">2345-6485</idno><idno type="eISSN">2345-6418</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Statement of the Problem</title><p> One disadvantage of cement-retained crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of cement-retained restoration and using porcelain stain to define this area.
</p></sec><sec><title>Purpose</title><p>This study aimed to evaluate the influence of existence of screw access hole on porcelain fracture resistance of metal-ceramic implant-supported crowns.
</p></sec><sec><title>Materials and Method</title><p> Thirty six standardized metal-ceramic crowns were fabricated and divided into 3 groups (n=12); group 1 conventional cement-retained metal-ceramic crowns as control group, group 2 cement-retained MC crowns in which porcelain stain was used to define the location of screw access channel, and group 3 cement-retained metal-ceramic crowns in the metal substructure of which a hole and ledge was designed in the location of screw access channel. The specimens were cemented (TempBond, Kerr) to their dedicated abutments. A hole was made in the location of screw access channel in group 2 and 3 and filled with photo-polymerized composite resin (3M; ESPE). All specimens were thermocycled and loaded in universal testing machine at crosshead speed of 2mm/min until fracture. Mean values of load at fracture were calculated in each group and compared with One-way ANOVA (α=0.05).
</p></sec><sec><title>Results</title><p> Mean value of the load required to fracture the restorations was 1947±487 N in group 1, 1927±539 N in group 2, and 2170±738 N in group 3. No statistically significant difference was found between the fracture resistance values of the three groups (<italic>p</italic>> 0.05)
</p></sec><sec><title>Conclusion</title><p> Presence of screw access channel in cement-retained implant restorations does not compromise fracture resistance.
</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Moraschini, V" uniqKey="Moraschini V">V Moraschini</name></author><author><name sortKey="Poubel, La" uniqKey="Poubel L">LA Poubel</name></author><author><name sortKey="Ferreira, Vf" uniqKey="Ferreira V">VF Ferreira</name></author><author><name sortKey="Barboza Edos, S" uniqKey="Barboza Edos S">S Barboza Edos</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kwon, T" uniqKey="Kwon T">T Kwon</name></author><author><name sortKey="Bain, Pa" uniqKey="Bain P">PA Bain</name></author><author><name sortKey="Levin, L" uniqKey="Levin L">L Levin</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Attard, Nj" uniqKey="Attard N">NJ Attard</name></author><author><name sortKey="Zarb, Ga" uniqKey="Zarb G">GA Zarb</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ozkan, Y" uniqKey="Ozkan Y">Y Ozkan</name></author><author><name sortKey="Ozcan, M" uniqKey="Ozcan M">M Ozcan</name></author><author><name sortKey="Akoglu, B" uniqKey="Akoglu B">B Akoglu</name></author><author><name sortKey="Ucankale, M" uniqKey="Ucankale M">M Ucankale</name></author><author><name sortKey="Kulak Ozkan, Y" uniqKey="Kulak Ozkan Y">Y Kulak Ozkan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hofstede, Tm" uniqKey="Hofstede T">TM Hofstede</name></author><author><name sortKey="Ercoli, C" uniqKey="Ercoli C">C Ercoli</name></author><author><name sortKey="Hagan, Me" uniqKey="Hagan M">ME Hagan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ekfeldt, A" uniqKey="Ekfeldt A">A Ekfeldt</name></author><author><name sortKey="Carlsson, Ge" uniqKey="Carlsson G">GE Carlsson</name></author><author><name sortKey="Borjesson, G" uniqKey="Borjesson G">G Börjesson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Becker, W" uniqKey="Becker W">W Becker</name></author><author><name sortKey="Becker, Be" uniqKey="Becker B">BE Becker</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Taylor, Td" uniqKey="Taylor T">TD Taylor</name></author><author><name sortKey="Agar, Jr" uniqKey="Agar J">JR Agar</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Levine, Ra" uniqKey="Levine R">RA Levine</name></author><author><name sortKey="Clem, D" uniqKey="Clem D">D Clem</name></author><author><name sortKey="Beagle, J" uniqKey="Beagle J">J Beagle</name></author><author><name sortKey="Ganeles, J" uniqKey="Ganeles J">J Ganeles</name></author><author><name sortKey="Johnson, P" uniqKey="Johnson P">P Johnson</name></author><author><name sortKey="Solnit, G" uniqKey="Solnit G">G Solnit</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Andersson, B" uniqKey="Andersson B">B Andersson</name></author><author><name sortKey="Odman, P" uniqKey="Odman P">P Odman</name></author><author><name sortKey="Lindvall, Am" uniqKey="Lindvall A">AM Lindvall</name></author><author><name sortKey="Br Nemark, Pi" uniqKey="Br Nemark P">PI Brånemark</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kerstein, Rb" uniqKey="Kerstein R">RB Kerstein</name></author><author><name sortKey="Castellucci, F" uniqKey="Castellucci F">F Castellucci</name></author><author><name sortKey="Osorio, J" uniqKey="Osorio J">J Osorio</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Adell, R" uniqKey="Adell R">R Adell</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Albrektsson, T" uniqKey="Albrektsson T">T Albrektsson</name></author><author><name sortKey="Zarb, G" uniqKey="Zarb G">G Zarb</name></author><author><name sortKey="Worthington, P" uniqKey="Worthington P">P Worthington</name></author><author><name sortKey="Eriksson, Ar" uniqKey="Eriksson A">AR Eriksson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Br Nemark, Pi" uniqKey="Br Nemark P">PI Brånemark</name></author><author><name sortKey="Svensson, B" uniqKey="Svensson B">B Svensson</name></author><author><name sortKey="Van, Steenberghe" uniqKey="Van S">Steenberghe van</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chee, W" uniqKey="Chee W">W Chee</name></author><author><name sortKey="Felton, Da" uniqKey="Felton D">DA Felton</name></author><author><name sortKey="Johnson, Pf" uniqKey="Johnson P">PF Johnson</name></author><author><name sortKey="Sullivan, Dy" uniqKey="Sullivan D">DY Sullivan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Michalakis, Kx" uniqKey="Michalakis K">KX Michalakis</name></author><author><name sortKey="Hirayama, H" uniqKey="Hirayama H">H Hirayama</name></author><author><name sortKey="Garefis, Pd" uniqKey="Garefis P">PD Garefis</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Rajan, M" uniqKey="Rajan M">M Rajan</name></author><author><name sortKey="Gunaseelan, R" uniqKey="Gunaseelan R">R Gunaseelan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Farina, Ap" uniqKey="Farina A">AP Farina</name></author><author><name sortKey="Spazzin, Ao" uniqKey="Spazzin A">AO Spazzin</name></author><author><name sortKey="Pantoja, Jm" uniqKey="Pantoja J">JM Pantoja</name></author><author><name sortKey="Consani, Rl" uniqKey="Consani R">RL Consani</name></author><author><name sortKey="Mesquita, Mf" uniqKey="Mesquita M">MF Mesquita</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mcglumphy, Ea" uniqKey="Mcglumphy E">EA McGlumphy</name></author><author><name sortKey="Mendel, Da" uniqKey="Mendel D">DA Mendel</name></author><author><name sortKey="Holloway, Ja" uniqKey="Holloway J">JA Holloway</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Pietrabissa, R" uniqKey="Pietrabissa R">R Pietrabissa</name></author><author><name sortKey="Gionso, L" uniqKey="Gionso L">L Gionso</name></author><author><name sortKey="Quaglini, V" uniqKey="Quaglini V">V Quaglini</name></author><author><name sortKey="Di, Martino" uniqKey="Di M">Martino Di</name></author><author><name sortKey="Simion, M" uniqKey="Simion M">M Simion</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hebel, Ks" uniqKey="Hebel K">KS Hebel</name></author><author><name sortKey="Gajjar, Rc" uniqKey="Gajjar R">RC Gajjar</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Torrado, E" uniqKey="Torrado E">E Torrado</name></author><author><name sortKey="Ercoli, C" uniqKey="Ercoli C">C Ercoli</name></author><author><name sortKey="Al, Mardini" uniqKey="Al M">Mardini Al</name></author><author><name sortKey="Graser, Gn" uniqKey="Graser G">GN Graser</name></author><author><name sortKey="Tallents, Rh" uniqKey="Tallents R">RH Tallents</name></author><author><name sortKey="Cordaro, L" uniqKey="Cordaro L">L Cordaro</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zarone, F" uniqKey="Zarone F">F Zarone</name></author><author><name sortKey="Sorrentino, R" uniqKey="Sorrentino R">R Sorrentino</name></author><author><name sortKey="Traini, T" uniqKey="Traini T">T Traini</name></author><author><name sortKey="Di Lorio, D" uniqKey="Di Lorio D">D Di lorio</name></author><author><name sortKey="Caputi, S" uniqKey="Caputi S">S Caputi</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Engquist, B" uniqKey="Engquist B">B Engquist</name></author><author><name sortKey="Nilson, H" uniqKey="Nilson H">H Nilson</name></author><author><name sortKey="Astrand, P" uniqKey="Astrand P">P Astrand</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Guichet, Dl" uniqKey="Guichet D">DL Guichet</name></author><author><name sortKey="Caputo, Aa" uniqKey="Caputo A">AA Caputo</name></author><author><name sortKey="Choi, H" uniqKey="Choi H">H Choi</name></author><author><name sortKey="Sorensen, Ja" uniqKey="Sorensen J">JA Sorensen</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kent, Dk" uniqKey="Kent D">DK Kent</name></author><author><name sortKey="Koka, S" uniqKey="Koka S">S Koka</name></author><author><name sortKey="Froeschle, Ml" uniqKey="Froeschle M">ML Froeschle</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Breeding, Lc" uniqKey="Breeding L">LC Breeding</name></author><author><name sortKey="Dixon, Dl" uniqKey="Dixon D">DL Dixon</name></author><author><name sortKey="Bogacki, Mt" uniqKey="Bogacki M">MT Bogacki</name></author><author><name sortKey="Tietge, Jd" uniqKey="Tietge J">JD Tietge</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Covey, Da" uniqKey="Covey D">DA Covey</name></author><author><name sortKey="Kent, Dk" uniqKey="Kent D">DK Kent</name></author><author><name sortKey="St Germain, Ha Jr" uniqKey="St Germain H">HA Jr St Germain</name></author><author><name sortKey="Koka, S" uniqKey="Koka S">S Koka</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Schweitzer, Dm" uniqKey="Schweitzer D">DM Schweitzer</name></author><author><name sortKey="Berg, Rw" uniqKey="Berg R">RW Berg</name></author><author><name sortKey="Mancia, Go" uniqKey="Mancia G">GO Mancia</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Daher, T" uniqKey="Daher T">T Daher</name></author><author><name sortKey="Morgano, Sm" uniqKey="Morgano S">SM Morgano</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Braden, M" uniqKey="Braden M">M Braden</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Karl, M" uniqKey="Karl M">M Karl</name></author><author><name sortKey="Graef, F" uniqKey="Graef F">F Graef</name></author><author><name sortKey="Taylor, Td" uniqKey="Taylor T">TD Taylor</name></author><author><name sortKey="Heckmann, Sm" uniqKey="Heckmann S">SM Heckmann</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Warpeha, Ws Jr" uniqKey="Warpeha W">WS Jr Warpeha</name></author><author><name sortKey="Goodkind, Rj" uniqKey="Goodkind R">RJ Goodkind</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Al Omari, Wm" uniqKey="Al Omari W">WM Al Omari</name></author><author><name sortKey="Shadid, R" uniqKey="Shadid R">R Shadid</name></author><author><name sortKey="Abu Naba A, L" uniqKey="Abu Naba A L">L Abu Naba'a</name></author><author><name sortKey="El Masoud, B" uniqKey="El Masoud B">B El Masoud</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Braun, S" uniqKey="Braun S">S Braun</name></author><author><name sortKey="Hnat, Wp" uniqKey="Hnat W">WP Hnat</name></author><author><name sortKey="Freudenthaler, Jw" uniqKey="Freudenthaler J">JW Freudenthaler</name></author><author><name sortKey="Marcotte, Mr" uniqKey="Marcotte M">MR Marcotte</name></author><author><name sortKey="Honigle, K" uniqKey="Honigle K">K Hönigle</name></author><author><name sortKey="Johnson, Be" uniqKey="Johnson B">BE Johnson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Da Rocha, Pv" uniqKey="Da Rocha P">PV Da Rocha</name></author><author><name sortKey="Freitas, Ma" uniqKey="Freitas M">MA Freitas</name></author><author><name sortKey="De Morais Alves Da Cunha, T" uniqKey="De Morais Alves Da Cunha T">T de Morais Alves da Cunha</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Pallis, K" uniqKey="Pallis K">K Pallis</name></author><author><name sortKey="Griggs, Ja" uniqKey="Griggs J">JA Griggs</name></author><author><name sortKey="Woody, Rd" uniqKey="Woody R">RD Woody</name></author><author><name sortKey="Guillen, Ge" uniqKey="Guillen G">GE Guillen</name></author><author><name sortKey="Miller, Aw" uniqKey="Miller A">AW Miller</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Dent (Shiraz)</journal-id><journal-id journal-id-type="iso-abbrev">J Dent (Shiraz)</journal-id><journal-id journal-id-type="publisher-id">JDS</journal-id><journal-title-group><journal-title>Journal of Dentistry</journal-title></journal-title-group><issn pub-type="ppub">2345-6485</issn><issn pub-type="epub">2345-6418</issn><publisher><publisher-name>Shiraz University of Medical Sciences</publisher-name><publisher-loc>Shiraz, Iran</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26106637</article-id><article-id pub-id-type="pmc">4476119</article-id><article-id pub-id-type="publisher-id">jds-16-61</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>The Effects of New Design of Access Hole on Porcelain Fracture Resistance of Implant-Supported Crowns</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Derafshi</surname><given-names>Reza</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Farzin</surname><given-names>Mitra</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Taghva</surname><given-names>Masoumeh</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author"><name><surname>Heidary</surname><given-names>Hossein</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author"><name><surname>Atashkar</surname><given-names>Berivan</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib></contrib-group><aff id="aff1"><label>1</label>Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</aff><aff id="aff2"><label>2</label>Postgraduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran;</aff><author-notes><corresp id="cor">Correspondence: Heidary H.; Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. Tel: +98-71-36263193-4 E-mail: dr.hheidary@gmail.com </corresp></author-notes><pub-date pub-type="ppub"><month>3</month><year>2015</year></pub-date><volume>16</volume><issue>1 Suppl</issue><fpage>61</fpage><lpage>67</lpage><history><date date-type="received"><month>12</month><year>2014</year></date><date date-type="rev-recd"><month>3</month><year>2015</year></date><date date-type="accepted"><month>4</month><year>2015</year></date></history><permissions><copyright-statement>© 2015: Journal of dentistry (Shiraz)</copyright-statement><license><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License, (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/3.0/">http://creativecommons.org/licenses/by/3.0/</ext-link>) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
</license-p></license></permissions><abstract><sec><title>Statement of the Problem</title><p> One disadvantage of cement-retained crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of cement-retained restoration and using porcelain stain to define this area.
</p></sec><sec><title>Purpose</title><p>This study aimed to evaluate the influence of existence of screw access hole on porcelain fracture resistance of metal-ceramic implant-supported crowns.
</p></sec><sec><title>Materials and Method</title><p> Thirty six standardized metal-ceramic crowns were fabricated and divided into 3 groups (n=12); group 1 conventional cement-retained metal-ceramic crowns as control group, group 2 cement-retained MC crowns in which porcelain stain was used to define the location of screw access channel, and group 3 cement-retained metal-ceramic crowns in the metal substructure of which a hole and ledge was designed in the location of screw access channel. The specimens were cemented (TempBond, Kerr) to their dedicated abutments. A hole was made in the location of screw access channel in group 2 and 3 and filled with photo-polymerized composite resin (3M; ESPE). All specimens were thermocycled and loaded in universal testing machine at crosshead speed of 2mm/min until fracture. Mean values of load at fracture were calculated in each group and compared with One-way ANOVA (α=0.05).
</p></sec><sec><title>Results</title><p> Mean value of the load required to fracture the restorations was 1947±487 N in group 1, 1927±539 N in group 2, and 2170±738 N in group 3. No statistically significant difference was found between the fracture resistance values of the three groups (<italic>p</italic>> 0.05)
</p></sec><sec><title>Conclusion</title><p> Presence of screw access channel in cement-retained implant restorations does not compromise fracture resistance.
</p></sec></abstract><kwd-group><title>Keywords</title><kwd>Dental Implants</kwd><kwd>Cement-retained</kwd><kwd>Fracture Resistance</kwd><kwd>Metal Ceramic Crowns</kwd></kwd-group></article-meta></front></pmc><affiliations><list><country><li>Iran</li></country></list><tree><country name="Iran"><noRegion><name sortKey="Derafshi, Reza" sort="Derafshi, Reza" uniqKey="Derafshi R" first="Reza" last="Derafshi">Reza Derafshi</name></noRegion><name sortKey="Atashkar, Berivan" sort="Atashkar, Berivan" uniqKey="Atashkar B" first="Berivan" last="Atashkar">Berivan Atashkar</name><name sortKey="Farzin, Mitra" sort="Farzin, Mitra" uniqKey="Farzin M" first="Mitra" last="Farzin">Mitra Farzin</name><name sortKey="Heidary, Hossein" sort="Heidary, Hossein" uniqKey="Heidary H" first="Hossein" last="Heidary">Hossein Heidary</name><name sortKey="Taghva, Masoumeh" sort="Taghva, Masoumeh" uniqKey="Taghva M" first="Masoumeh" last="Taghva">Masoumeh Taghva</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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