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논문 기본 정보

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학술저널
저자정보
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대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제3권 제4호
발행연도
2011.1
수록면
186 - 189 (4page)

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PURPOSE. Porcelain fused to metal (PFM) crowns provide the best treatment option for teeth that have a large or defective restoration. More than 20% of teeth with PFM crowns or bridges require non-surgical root canal treatment (NSRCT). This may be due to the effect of restorative procedures and the possible leakage of bacteria and or their by-products, which leads to the demise of the tooth pulp. Thus, this study was planned to compare the ability of the restorative materials to seal perforated PFM specimens. MATERIALS AND METHODS. The study evaluates the ability of amalgam, composite or compomer restorative materials to close perforated PFM specimen’s in-vitro. Ninety PFM specimens were constructed using Ni-Cr alloys and feldspathic porcelain, and then they were divided into 3 groups: amalgam (A), composite + Exite adhesive bond (B) and compomer + Syntac adhesive bond (C). All the PFM samples were embedded in an acrylic block to provide complete sealing of the hole from the bottom side. After the aging period, each group was further divided into 3 equal subgroups according to the thermocycling period (one week for 70 cycles, one month for 300 cycles and three months for 900 cycles). Each subgroup was put into containers containing dye (Pelikan INK), one maintained at 5℃ and the other at 55℃, each cycle for 30 sec time. The data obtained was analyzed by SPSS, 2006 using one way ANOVA test and student t-test and significant difference level at (P<.01). RESULTS. The depth of dye penetration was measured at the interfaces of PFM and filling materials using Co-ordinate Vernier Microscope. The lowest levels of the dye penetration for the three groups, as well as subgroups were during the first week. The values of dye leakage had significantly increased by time intervals in subgroups A and C. CONCLUSION. It was seen that amalgam showed higher leakage than composite while compomer showed the lowest level of leakage.
#Porcelain fused to metal restorations #Restorative dental materials #Thermocycling effect

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참고문헌 (18)

참고문헌 신청
Alavi AA / 2002 / Microleakage of direct and indirect composite restorations with three dentin bonding agents / Oper Dent 27 : 19 ~ 24 google schola Brisen?o Marroquin B / 1995 / Microleakage of gold casting repairs with different materials as quantified by a helium gas system / Oper Dent 20 : 197 ~ 203 google schola Craig RG / 1997 / Restorative dental materials (10th ed) / Mosby google schola Grobler SR / 1999 / In vitro, relative microleakage of five restorative systems / Int Dent J 49 : 47 ~ 52 google schola Hakimeh S / 2000 / Microleakage of compomer class V restorations: effect of load cycling, thermal cycling, and cavity shape differences / J Prosthet Dent 83 : 194 ~ 203 google schola

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