ABSTRACT
A cast or oil- cont aining dent al lut ing agent : effect s
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st r engt h
Juliana dos Reis DERCELI1, Laiza Maria Grassi FAIS2, Lígia Antunes Pereira PINELLI2
1- Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
2- Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ. Estadual Paulista - UNESP, Araraquara, SP, Brazil.
Corresponding address: Lígia Antunes Pereira Pinelli - Rua Humaitá, 1680 - Centro - Araraquara - SP - Brazil - 14801-903
- Phone: +55 (16) 3301-6413 - Fax: +55 (16) 3301-6406 - e-mail: ligia@foar.unesp.br
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avorable r esult s in t he use of cast or oil polyur et hane ( COP) as pulp capping, m em brane m at er ial, sealer, m out hwash and in bone r epair, associat ed w it h t he fact t hat Ricinuscom m unis is not derived from pet roleum and it is abundant in Brazil, encourage researches LQWKHGHYHORSPHQWRIOXWLQJDJHQWV2EMHFWLYHV7KLVVWXG\FRPSDUHGWKHÀH[XUDOVWUHQJWK
( FS) of a cast or oil- cont aining dent al lut ing agent w it h a w eight per cent age of 10% ( w t % ) of calcium car bonat e ( COP10) w it h RelyX ARC ( RX) aft er m echanical cycling ( MC) and dist illed wat er st orage. Mat er ial and Met hods: Sixt y- four specim ens ( 25x2x2 m m ) w er e fabr icat ed and divided int o t w o gr oups, COP10 and RX ( cont r ol) . Each gr oup was divided int o 4 subgr oups ( n= 8) accor ding t o t he st orage t im e, 24 hour s ( 24 h) or 60 days ( 60 d) , and t he per for m ance ( MC+ FS) or not ( only FS) of t he m echanical cycling t est . The FS ( 10 kN; 0.5 m m / m in) and MC t est s ( 10,000 cycles, 5 Hz, 0.5 m m / m in) w er e car r ied out using an MTS- 810 m achine. The dat a w er e analyzed using ANOVA (α= 0.05) . Result s: The
obt ained FS ( MPa) values w er e: COP10 24h- 19.04± 2.41; COP10 60d- 17.92± 3.54; RX 24h- 75.19± 3.43; RX 60d- 88.77± 6.89. All t he RX specim ens subm it t ed t o MC fract ur ed, w hile t he values for COP10 aft er MC w er e as follow s: COP10 24h- 17.90± 1.87 and COP10 60d- 18.60± 1.60. Conclusions: A cast or oil- cont aining dent al lut ing agent w it h a w eight per cent age of 10% ( w t % ) of calcium car bonat e is r esist ant t o m echanical cycling w it hout
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Ke y w or ds: Biocom pat ible m at er ials. Polyur et hanes. Dent al cem ent s. Mat er ial r esist ance.
Aging.
I N TROD UCTI ON
Polym er s ar e biocom pat ible m at er ials of nat ural or synt het ic origin t hat can be prepared by different m et h od s3 4. I n d en t ist r y, v ar iou s p oly m er s ar e
used, such as silicone, m et hyl m et hacr ylat e and polyur et hane. Cur r ent ly, veget able- polyur et hane, which com bines t he versat ilit y of polym er form ulat ion w h i l e ad d r essi n g t h e g l o b al co n cer n t o w ar d s p r o d u ci n g n ew b i o m at er i al s f r o m su st ai n ab l e r esour ces, has becom e one of t he m ost st udied biom at er ials3. The use of veget able- polyur et hane
der ived fr om cast or oil ( COP) in t he healt h science f i el d s h as b een st u d i ed , an d COP h as sh o w n
fav or able r esu lt s in t est s for biocom pat ibilit y2 2.
Cast or oil is a new m at erial t hat is globally available, and it has r eceived m uch at t ent ion in r ecent year s because of it s availabilit y on a lar ge com m er cial scale23.
Th e COP is a b iocom p at ib le, an t im icr ob ial, ost eoint egrable and absor bable, ost eoconduct ive and ost eoinduct ive13. I n dent ist r y, t he use of t his
polym er has been st udied in dir ect pulp capping5,
as a m em br an e m at er ial2 2, as a sealer3 1, as a
m out hwash28, as bone pr ost hesis and in alveolar
h ealin g7 an d b on e r econ st r u ct ion2 0. I n clin ical
good biocom pat ibilit y for use bot h in soft and har d t issue, has ost eoinduct ive pr oper t ies, and can be bact er icidal and fungicidal w hen com bined w it h calcium car bonat e.
The ver sat ilit y of t he polyur et hane der ived fr om cast or oil as w ell as t he afor em ent ioned posit ive aspect s suppor t t he st udy of COP as a dent al lut ing agent . Alt hough a wide range of dent al lut ing agent s is com m er cially available, t he select ion of a lut ing agent t o be used for a given r est orat ion should not be an ar bit rar y choice. I t m ust be based on a basic know ledge of t he m at er ials available, t he t ype of r est orat ion t o be placed, and t he r equir em ent s
GH¿QHGE\WKHSDWLHQW17 based on t he funct ional and
biological needs2 of a par t icular clinical sit uat ion,
including handling charact er ist ics such as w or king t im e, set t ing t im e, consist ency and ease of rem oval of ex cess m at er ial3 3. As su ch , n o sin gle den t al
lut ing agent is consider ed ideal, and new pr oduct s should be st udied. I t is im por t ant t o charact er ize t he m echanical, physical and biological propert ies of COP. When com par ed w it h zinc phosphat e cem ent , t he COP, w it h t he addit ion of calcium car bonat e, pr esent ed bet t er diam et ral t ensile st r engt h values
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The addit ion of calcium car bonat e is r esponsible for confer r ing radiopacit y t o COP29. Mor eover, t his
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ion exchange at t he bone/ r esin m at r ix int er face15,
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m ar gins. The COP dent al lut ing agent s ar e deem ed st r ong enough t o r esist m ast icat or y st r esses and pr ovide r et ent ion sim ilar t o t hat of zinc phosphat e cem ent , a per m anent cem ent at ion m at er ial29.
I n t he oral cavit y, t he chew ing for ces applied t o r est orat ive m at er ials r esult in cycles of m echanical i m p u l se s t h a t l e a d t o m a t e r i a l f a t i g u e a n d , co n se q u e n t l y, f r a ct u r e . Th e se i m p u l se s ca n b e sim u lat ed in t h e lab or at or y b y p er f or m in g m e c h a n i c a l c y c l i n g , w h i c h a p p r o a c h e s t h e physiological condit ions generat ed by t he chew ing cycle24. Fixed par t ial dent ur es ar e m or e likely t o be
subj ect ed t o bending for ces t han t o ot her t ypes of st r ess10,25,26$VVXFKWKHÀH[XUDOSURSHUWLHVRIWKH
r est orat ive m at er ial ar e m or e im por t ant t han t heir t ensile, shear and com pressive st rengt hs. Moreover,
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appr opr iat e for sim ulat ing t he clinical sit uat ion of m at er ial fat igue4,32 because t he concent rat ion of
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in t he dent al lut ing agent pr ior t o t he fract ur e or displacem en t of t h e r est or at ion m at er ial1 1. Th e
m echanical pr oper t ies of r esinous m at er ials ar e direct ly relat ed t o t he quant it y and t ype of inorganic par t icles8, degr ee of cur e and per cent age of
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Most cur r ent in vit r o st udies include cycling t est ing
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of st r ess on t he m at er ial16,21.
The aim of t his st udy was t o assess t he behavior of COP u n der m ast icat or y st r ess sim u lat ed by
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w it h a w eight per cent age of 10% ( w t % ) of calcium car b on at e w as an aly zed w it h an d w it h ou t t h e per for m ance of t he m echanical cycling t est as w ell as w it h st orage in dist illed wat er. The r esult s w er e com par ed w it h t he r esult s for RelyX ARC. The null hypot hesis was t hat t her e is no differ ence bet w een
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ARC.
M ATERI AL AN D M ETH OD S
The pr ocedur e of t he st udy is sum m ar ized in Figur e 1. For t he COP10 gr oup, 32 specim ens w er e fabr icat ed w it h t h e cast or oil- con t ain in g den t al lut ing agent ( Cast or Oil Polyuret hane - COP, Poliquil Araraquara, Chem ical Polym ers Lt d, Araraquara, SP, Brazil) w it h a w eight per cent age of 10% ( w t % ) of calcium car bonat e ( CaCO3) . For t he cont r ol gr oup, nam ed RX, 32 specim ens w er e fabr icat ed w it h t he r esin cem ent RelyX ARC ( 3M ESPE, Sum ar é, SP, Brazil) . Each gr oup was random ly divided int o 4 subgr oups ( n= 8) accor ding t o t he st orage t im e in dist illed wat er, 24 hour s ( 24 h) or 60 days ( 60 d) , and t he per for m ance or not of t he m echanical cycling ( MC) t est .
The COP was pr ovided in a sachet cont aining polyol, pr epoly m er and calcium car bonat e6. This
poly u r et h an e h as t h e f ollow in g h igh ly r eact iv e gr oups in t he r icinoleic acid st r uct ur e: a car bonyl g r ou p on t h e f ir st car b on , a d ou b le b on d ( or unsat urat ion) on t he nint h car bon and a hydr oxyl gr oup on t he t w elft h car bon. This com binat ion of a hydroxyl group and unsat urat ion occurs exclusively i n t h e ca st o r o i l m o l ecu l e1 4. Pr ep o l y m er w a s
synt hesized fr om m et hylene diphenyl diisocyanat e ( MDI ) and was prepolym erized wit h t he polyol while pr eser v ing 20% of fr ee isocyanat e. When t hese t w o com ponent s w er e m ixed, t he m oist ur e- cur ing k in et ics w as det er m in ed by t h e poly m er izat ion r eact ion b et w een t h e isocy an at e an d h y d r ox y l groups. The st oichiom et ric rat io bet ween t he polyol and t he pr epolym er was equal t o 1: 0.66.
For t he COP1 0 specim ens, t he m at er ial w as m anually m ixed in t he sachet for 2 m inut es. I t was
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This apparat us was placed in a m echanical pr ess under const ant load and st or ed in sat urat ed wat er vapor in a cont ainer lined w it h w et paper at 37° C for one hour9.
accor ding t o t he inst r uct ions of t he m anufact ur er,
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cur ed w it h light at t hr ee point s along it s lengt h on bot h sides for 40 seconds each10. The m at r ix was
placed in a m echanical pr ess under const ant load and st or ed in sat urat ed wat er vapor in a cont ainer lined w it h w et paper at 37° C for one hour9.
Aft er t he init ial st orage per iod of 1 hour, all t he sam ples w er e r em oved fr om t he m at r ix and polished w it h 200 gr it silicon car bide sandpaper ( 3M ESPE) . Then, t hey w er e m easur ed at t hr ee point s using a digit al caliper ( 500- 144B, Mit ut oyo Sul Am er ica Lt d, Suzano, SP, Brazil) t o ver ify t he w idt h and t hickness. A var iance of ± 0.2 m m was accept ed. The sam ples w er e im m er sed in dist illed
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t o t he subgr oups.
All sam ples w er e subj ect ed t o 3- point bending
t est , w hich was conduct ed in a univer sal t est ing m achine ( MTS 810, Mat er ial Test Sy st em , Eden Prairie, MN) equipped wit h t he Test Work 4 soft ware, at a cr osshead of 0.5 m m / m in18 and w it h a 10 kN
load cell. The FS values w er e calculat ed in MPa
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point , I = dist ance bet w een t he suppor t s, b= w idt h of t he sam ples, d= t hickness of t he sam ples) . The MC pr ocedur e w as car r ied out under condit ions equivalent t o t hose used for t he FS t est . Sam ples w er e subm it t ed t o 10,000 cycles at a fr equency of 5 Hz and a cross- head displacem ent of 0.5 m m . The init ial load was 60% of t he m ean FS value previously obt ained. Aft er com plet ing t he MC, sam ples w er e subm it t ed t o FS. Nor m alit y dist r ibut ion w it hin each sam ple was done using Kolm ogor ov- Sm ir nov t est , an d t h e com par ison bet w een t h e ex per im en t al
COP10 RX
24 hours 60 days 24 hours 60 days
Without mechanical cycling
19.04±2.41a 17.92±3.54a 75.19±3.43b 88.77±6.89c
With mechanical cycling
17.90±1.87a 18.60±1.60a * *
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performance of mechanical cycling test
* Specimens did not resist the mechanical cycling
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su b g r o u p s w a s p e r f o r m e d u si n g a n a l y si s o f
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5% (α= 0.05) .
RESULTS
The FS values ar e show n in Table 1. The COP10 specim ens had m ean only about 25% of t he RelyX ARC. The RX sam ples did not r esist t he m echanical cycling and fract ured before t he 10,000 cycles were com plet ed. Tw o- way ANOVA am ong t he subgr oups
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t he FS values as a funct ion of eit her t he “ m echanical cycling” ( F1,28= 0.068; p= .0795) or “ st orage t im e”
( F1,28 S 2QHZD\$129$LGHQWL¿HG
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of RelyX ARC st orage ( F1,14= 24.860, p< .0002) ; it
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st r engt h of t he RX sam ples ( Table 1) .
D I SCUSSI ON
I n t his st udy, t he null hypot hesis was r ej ect ed
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different from t hat of t he RelyX ARC, a com m ercially available and m ost w idely used r esin cem ent . Tw o clinical sit uat ions w er e assessed using condit ions designed t o sim ulat e t he oral envir onm ent : aging was sim ulat ed by st orage in aqueous m edium12,
and chew ing for ces w er e sim ulat ed by m echanical cycling24 7KH FDOFLXP FDUERQDWH ¿OOHU ZDV XVHG
because pr ev ious st udies have show n it s abilit y t o pr ovide radiopacit y t o t he COP and t o supply bact ericidal and fungicidal propert ies t o t he cem ent , propert ies t hat can be a key fact or in t he select ion of a dent al lut ing agent . The addit ion of 10% calcium carbonat e showed good result s regarding diam et ral
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The m echanical propert ies of resinous m at erials ar e d i r ect l y r el at ed t o t h e q u an t i t y an d t y p e ( com posit ion, shape, size and dist r ibut ion) of t he inor ganic par t icles8, degr ee of cur e and per cent age
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par t icles30. The r esult s of t his st udy show ed t hat ,
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COP10 gr oup was low er t han t hat of t he RelyX ARC gr oup. This r esult can be explained by differ ences
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cem ent s.
The RelyX ARC is com posed of t he follow ing: 1 ) an or gan ic m at r ix com posed of m on om er s, p oly m er izat ion in h ib it or s, color m od if ier s an d an init iat or / act ivat or sy st em ; 2) a zir conia/ silica
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3) or gano- silane as a bonding agent bet w een t he
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is com posed of t he follow ing: 1 ) a m at r ix t hat
r esult s fr om t he polym er izat ion of polyest er fr om veget able polyol wit h linear aliphat ic diisocyanat es; 2) 10% ( w t % ) of calcium car bonat e by w eight as
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of a b on d in g ag en t , w h ich cou ld r esu lt in t h e consequent failure in t he linking- up of t he inorganic par t icles w it h t he r esin m at r ix , could be a k ey
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How ever, even t hough t he FS m ean for COP10 was only about 25% of t hat of RelyX ARC, t he FS values w er e sim ilar or slight ly less t han t hose found for lut ing agent s such as zinc phosphat e ( 18 MPa) , glass ion om er cem en t ( 1 5 3 6 MPa) an d r esin
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The specim ens m ade fr om t he r esin cem ent RelyX ARC did not achieve t he FS values r epor t ed
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( 8 6 ± 6 – 1 5 5 ± 7 MPa) in 2 4 h ou r s1 8. How ev er,
aft er 6 0 day s of st orage in dist illed w at er, t his dent al lut ing agent show ed an 18% incr ease in FS in com par ison w it h t he values obt ained aft er 2 4 h ou r s. I t h as b een sh ow n in t h e lit er at u r e t hat m echanical r esist ance r esult s can var y as a
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cur e and t est ing m et hod used12. Accor ding som e
aut hors10,12,26, increases in FS, even in t he presence
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or cont inued polym erizat ion t hat m ay occur in dual-cur e cem ent s.
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st r e n g t h o f t h e COP1 0 sp e ci m e n s r e m a i n e d st at ist ically sim ilar t o t h at ob ser v ed af t er 2 4 hour s of st orage. Accor ding t o t he m anufact ur es of t he COP, aft er 1 hour, t he cem ent has acquir ed st r en g t h , alt h ou g h it can con t in u e t o p r esen t r esidual poly m er izat ion for up t o 36 hour s aft er t he init ial m ixing, t hought m ost of t he isocyanat e-hy dr ox y l r eact ion is com plet ed in 24 hour s. As such, in t his st udy, t he r esidual poly m er izat ion t hat occur r ed bet w een 24 and 36 hour s of st orage
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values. Mor eover, consider ing t hat t he specim ens w er e im m er sed in dist illed w at er an d t h at t h e f r ee isocy an at es m ay h av e r eact ed w it h w at er m olecules, it w as int er est ing t hat t her e w as no decr ease in FS, i.e., t he long- t er m effect of wat er st orage did not affect t he FS of t he COP10, sim ilarly
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deionized wat er31.
The r esult s of t he MC t est show t hat t he RelyX
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m ay be t he r esult of t he lar ge am ount of zir conia/ si l i ca f i l l er ( 6 7 . 5 w t % ) i n co r p o r at ed i n t o t h e m at r ix177KLVDPRXQWRI¿OOHUPD\KDYHLQÀXHQFHG
show ed no change in FS aft er m echanical cycling, possibly due t o t he higher elast icit y provided by t he
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failur e pot ent ial of a cem ent ed r est orat ion under forces is relat ed t o t he m echanical propert ies of t he individual part s ( periodont al ligam ent , t oot h, lut ing agent and rest orat ion)32. Despit e report s of success
of RelyX ARC1,27, cur r ent lit erat ur e show s t hat t he
com par ison s based on adh esiv e pr oper t ies an d
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part ial dent ures ( FPD) cem ent ed wit h RelyX ARC are st ill lim it ed. Then, t his in vit ro st udy was carried out as a pr elim inar y st udy t o invest igat e and com par e t he behavior of t he COP10 under t ension, w it hout
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and fat igue) behavior of cr ow ns or FPD cem ent ed w it h t hese t w o m at er ials in or der t o enhance t he know ledge about COP10 and RelyX ARC.
Despit e t he lim it at ions inher ent t o an in vit r o st udy as w ell as t he low er FS values of t he COP10 t hat w er e obser ved, t his dent al lut ing agent can st ill be consider ed a pr om ising m at er ial due t o i t s ch ar act er i st i cs r el at ed t o b i o co m p at i b i l i t y, elast icit y, m ech an ical st r en g t h an d v er sat ilit y
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Mor eover, Ricinus com m unis is a plant easily found in Brazil wit h great pot ent ial in t he m anufact uring of product s derived from it s oil. As such, fut ure st udies sh ou ld be con du ct ed t o assess COP con t ain in g higher concent rat ions of CaCO3 and t he addit ion
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im pr ove it s m echanical r esist ance, causing it t o have pr oper t ies sim ilar t o t hose of com m er cially available r esin cem ent s.
CON CLUSI ON
A cast or oil- cont aining dent al lut ing agent wit h a 10% weight percent age ( wt % ) of calcium carbonat e r esist ed m echanical cycling w it hout decr eases in
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ACKN OW LED GEM EN TS
The aut hors t hank São Paulo Research Foundat ion
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2006/ 02821- 8) .
REFEREN CES
1- Aguiar TR, Andr é CB, Cor r er- Sobr inho L, Ar rais CA, Am br osano GM, Giannini M. Effect of st orage t im es and m echanical load cycling on dent in bond st r engt h of convent ional and self- adhesive r esin lut ing cem ent s. J Pr ost het Dent . 2014; 111: 404- 10.
2 - At t a r N, Ta m LE, McCo m b D. Mech a n i ca l a n d p h y si ca l pr oper t ies of cont em porar y dent al lut ing agent s. J Pr ost het Dent . 2003; 89: 127- 34.
3- Bao H, Zhang ZP, Ying S. Effect of ionic gr oup on t he behaviour of polyur et haneur ea em ulsion. Polym er. 1996; 37: 2751- 4. %ODFNPDQ5%DUJKL1'XNH(,QÀXHQFHRIFHUDPLFWKLFNQHVV on t he polym erizat ion of light- cured resin cem ent . J Prost het Dent . 1990; 63: 295- 300.
5- Cam ar go SE, Rode SM, Prado RF, Car valho YR, Cam ar go CH. Subcut aneous t issue r eact ion t o cast or oil bean and calcium hydr oxide in rat s. J Appl Oral Sci. 2010; 18: 273- 8.
6- Car m ello JC, Fais LM, Ribeir o LN, Clar o Net o S, Guaglianoni '*3LQHOOL/$'LDPHWUDOWHQVLOHVWUHQJWKDQG¿OPWKLFNQHVVRIDQ exper im ent al dent al lut ing agent der ived fr om cast or oil. J Appl Oral Sci. 2012; 20: 16- 20.
&DUYDOKR7/$UD~MR&$7Hy¿OR-0%UHQWHJDQL/*+LVWRORJLF a n d h i st o m et r i c ev a l u a t i o n o f r a t a l v eo l a r w o u n d h ea l i n g ar ound polyur et hane r esin im plant s. I nt J Oral Maxillofac Sur g. 1997; 26: 149- 52.
8- Condon JR, Ferracane JL. I n vit ro wear of com posit e wit h varied FXUH¿OOHUOHYHODQG¿OOHUWUHDWPHQW-'HQW5HV 11.
&RXQFLO DGRSWV $PHULFDQ 'HQWDO $VVRFLDWLRQ 6SHFL¿FDWLRQ No. 8 ( dent al zinc phosphat e cem ent ) and 11 ( agar im pr ession m at er ial) . Council on Dent al Mat er ials and Devices. J Am Dent Assoc. 1967; 74: 1565- 73.
'X\PXV=<<DQLNR÷OX1'$ONXUW0(YDOXDWLRQRIWKHÀH[XUDO st r engt h of dual- cur e com posit e r esin cem ent s. J Biom ed Mat er Res B Appl Biom at er. 2013; 101: 878- 81.
)DQ 3 1LFKROOV -, .RLV -& /RDG IDWLJXH RI ¿YH UHVWRUDWLRQ m o d a l i t i e s i n st r u ct u r a l l y co m p r o m i se d p r e m o l a r s. I n t J Pr ost hodont . 1995; 8: 213- 20.
12- Fer racane JL, Ber ge HX, Condon JR. I n vit r o aging of dent al FRPSRVLWHVLQZDWHUHIIHFWRIGHJUHHRIFRQYHUVLRQ¿OOHUYROXPH DQG¿OOHUPDWUL[FRXSOLQJ-%LRPHG0DWHU5HV 13- Ferreira CM, Silva Rosa OP, Torres SA, Ferreira FB, Bernardinelli N. Act iv it y of endodont ic ant ibact er ial agent s against select ed anaer obic bact er ia. Braz Dent J. 2002; 13: 118- 22.
)HUUHLUD33HUHLUD5&RHOKR-)6LOYD$)*LO0+0RGL¿FDWLRQRI t he biopolym er cast or oil wit h free isocyanat e groups t o be applied as bioadhesive. I nt J Biol Macr om . 2007; 40: 144- 52.
15- Frazilio FO, Rossi R, Negr ini Net o J, Facco GG, Ovando M, Fialho M. Use of cast or oil polyuret hane in an alt ernat ive t echnique for m edial pat ella sur gical cor r ect ion in dogs. Act a Cir Bras. 2006; 21: 74- 9.
16- Fr eem an MA, Nicholls JI , Kydd WL, Har r ingt on GW. Leakage associat ed w it h load fat igue- induced pr elim inar y failur e of full cr ow ns placed ov er t hr ee differ ent post and cor e sy st em s. J Endod. 1998; 24: 26- 32.
+LOO (( 'HQWDO FHPHQWV IRU GH¿QLWLYH OXWLQJ D UHYLHZ DQG pract ical clinical considerat ions. Dent Clin Nort h Am . 2007; 51: 643-58.
18- I nt er nat ional Or ganizat ion for St andar dizat ion. I SO 4049: Dent ist r y - Polym er- based r est orat ive m at er ials. Geneva: I SO; 2009.
19- Jow et t AK, Fer guson MW, Com be EC. I n vit r o biocom pat ibilit y t est ing: a new or gan cult ur e m odel. J Dent . 1988; 16: 55- 65. 20- Leit e FR, Ram alho LT. Bone r egenerat ion aft er dem ineralized bone m at r ix and cast or oil ( Ricinus com m unis) poly ur et hane im plant at ion. J Appl Oral Sci. 2008; 16: 122- 6.
2 2 - M o n t e i r o A S , M a c e d o LG, M a c e d o N L, B a l d u c c i I . Polyuret hane and PTFE m em branes for guided bone regenerat ion: hist opat hological and ult rast r uct ural evaluat ion. Med Oral Pat ol Oral Cir Bucal. 2010; 15: 401- 6.
23- Nayak P, Mishra DK, Sahoo KC, Pat i NC, Jena PK, Lenka S, et al. Polym er s fr om r enewable r esour ces. XI I I . I nt er penet rat ing p o l y m er n et w o r k s d er i v ed f r o m ca st o r o i l - h ex a m et h y l en e d iisocy an at e an d p oly m et h acr y lam id e. J Ap p l Poly m er Sci. 2001; 80: 1349- 53.
24- Nik aido T, Kunzelm ann KH, Chen H, Ogat a M, Harada N, Yam aguchi S, et al. Evaluat ion of t her m al cycling and m echanical loading on bond st rengt h of a self- et ching prim er syst em t o dent in. Dent Mat er. 2002; 18: 269- 75.
25- Oilo G, Espevik S. St ress/ st rain behavior of som e dent al lut ing cem ent s. Act a Odont ol Scand. 1978; 36: 45- 9.
26- Pace LL, Hum m el SK, Marker VA, Bolouri A. Com parison of t he ÀH[XUDOVWUHQJWKRI¿YHDGKHVLYHUHVLQFHPHQWV-3URVWKRGRQW 2007; 16: 18- 24.
27- Pek per dahci T, Tur koz Y, Ozan O, Seker E. The effect s of differ ent adhesive agent s on t he shear bond st r engt h of a self-adhesive resin cem ent . J Appl Biom at er Funct Mat er. 2012; 10: 149-56.
28- Pinelli LA, Mont andon AA, Corbi SC, Moraes TA, Fais LM. Ricinus com m unis t r eat m ent of dent ur e st om at it is in inst it ut ionalised elder ly. J Oral Rehabil. 2013; 40: 375- 80.
29- Pinelli LA, Fais LM, Ricci WA, Reis JM. I n vit r o com par isons of cast ing r et ent ion on im plant abut m ent s am ong com m er cially available and ex per im ent al cast or oil- cont aining dent al lut ing agent s. J Pr ost het Dent . 2013; 109: 319- 24.
30- Piw owar czyk A, Lauer HC. Mechanical pr oper t ies of lut ing cem ent s aft er wat er st orage. Oper Dent . 2003; 28: 535- 42. 31- Rosa PC, Mancini MN, Cam ar go SE, Gar r ido AD, Cam ar go CH, Rode SM. Dim ensional alt erat ions and solubilit y of new endodont ic sealer s. Braz Dent J. 2010; 21: 301- 4.
32- Sask alausk ait e E, Tam LE, McCom b D. Flex ural st r engt h, HODVWLFPRGXOXVDQGS+SUR¿OHRIVHOIHWFKUHVLQOXWLQJFHPHQWV J Pr ost hodont . 2008; 17: 262- 8.
