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임범순(Bum-Soon Lim),허수복(Soo-Bok Her) 대한치과의사협회 2011 대한치과의사협회지 Vol.49 No.5
The introduction of zirconia-based materials to the dental field broadened the design and application limits of all-ceramic restorations. Most ceramic restorations are adhesively luted to the prepared tooth, however, resin bonding to zirconia components is less reliable than those to other dental ceramic system. It is important for high retention. prevention of microleakage, and increased fracture resistance, that bonding techniques be improved for zirconia system. Strong resin bonding relied on miromenchanical interlocking and adhesive chemical bonding to the ceramic surface, requiring surface roughening for mechanical bonding and surface activation for chemical adhesion. In many cases, high strength ceramic restorations do not require adhesive bonding to tooth structure and can be placed using conventional cements which rely only on micromechanical retention. However, resin bonding is desirable in some clinical situations. In addition, it is likely that strong chemical adhesion would lead to enhanced long-term fracture and fatigue resitance in the oral environment.
표면처리가 수리한 구치용 강화형 콤포짓트 레진의 전단결합강도에 미치는 영향
허수복,임범순,김철위 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
Despite significant improvement in the mechanical properties of composite resins, They still undergo wear, discoloration, fracture with time. Repair is an alternative to the total replacement of old composite resin restoration, because it reduces pulpal trauma, and cost, time. The successful bond strength between new and old composite usually requires micromechanical retention and coating of old composite with unfilled resin. Micromechanical retention can be achiveved by sandblasting, grinding, or acid etching. Now application of bonding agent after sandblasting is known as the most effective surface treatment for composite repair. The aim of this study is to compare sandblasting with grinding as micromechanical reughening method and to evaluate the effect of bonding agent, silane primer, and post-cure thermocycling on shear bond strength of repaired posterior composite resins. The three posterior composite resins were used in this study. Charisma, Aelitefil, and Z-100 were for substrate resin and only Z-100 for repair resin. Then they were thermocycled(5∼55℃, 1,000 cycles) for aging. The substrate surface was treated by various methods : 1 group-NT (no treatment), 2 group-BA (bonding agent ; Scotchbond MP), 3 group-SB (sandblastion with 50μm alumina partcles), 4 group-GR (400 grit Sic grinding), 5 group-SB+BA, 6 group-GR+BA, 7 group-SB+PR (primer : Scotchprime-ceramic primer) +BA, 8 group-GR+PR+BA. After speciments 24 hours and the other 5 specimens were thermocycled again(5∼55℃, 600 cycles). The sheal bond strength wa measured by Instron testing machine with 1.0 mm/min. cross-head speed. From the experiment, the following results were obtained : 1. Shear bond strength of sandblasted group was significantly higher(P<0.05) than that of control group, but there was no significant difference(P>0.05) of bond strength between ground group and control group. However application of bending agent after grinding significantly(P<0.05) increase the bond strength of contorl group. 2. Although the values of shear bond strength of silane-primed groups were higher than those of unprimed groups, there was no significancy(P>0.05) 3. When bonding agent has been applicated, there was no statistically significan difference between sandblasted group and group group(P>0.05). 4. No statistically significant difference of shear bond strength was made by therocyling(5∼55℃, 600 cycles)