| With the increase of living standard and material science raising in recent years, people have much higher requirement on the appearance of dental prosthetic restoration, and have higher requirement on simulation while dental prosthetic restoration have a perfectly structural feature. Replication on color was a basic standard to perfect simulation on dental prosthetic restoration with porcelain;Vita In-Cream alumina all ceramic system have a sky-high content in crystal of aluminum power. Fusion between In-Ceram hype-alumina base and hypo-melting point glass powder increased intensity of the maken, which could be used in multi-unit restorations and anterior teeth's tri-unit fixed bridge restorations.it was generally used for prevalent to traditionary material.Traditional glass infiltrated technology with slow-speed took long time, infiltrated technology was continually improved for preferable practice was in clinic in 1990'later period and shoten the technical flowsheet;then there did not have a canonical document to identify the effect of technical flowsheet on microstructure and color,that was incompatible on report. Therefore, we research effect of different technology on microstructure and color,analysis the difference of dental prosthetic restoration between slow-speed and fast-speed infiltrated technologies,and found the best agglutination technology to dental prosthetic restoration with all ceramic.Contents and Methods:1. To explore the effects of presintering and infiltration technique on microstructure of In-Ceram alumina substrate. 40 rectangular model namely of In-Ceram alumina were randomly divided into four groups, pre-slow-speed infiltrated group, post-slow-speed infiltrated group, pre-fast-speed infiltrated group and post-fast-speed infiltrated group. The morphologies were observed by scanning electron microscopy (JSM-6460), and observe blowhole Patterns and Porosity on 20 region of model, and evaluate the change of microstructure after infiltration technique of the four groups.2. To investigate the effects of presintering and infiltration technique on color of In-Ceram alumina substrate. 40 Disc-shaped model made of In-Ceram alumina were randomly drived into four groups: pre-slow-speed infiltrated group, post-slow-speed infiltrated group, pre-fast-speed infiltrated group and post-fast-speed infiltrated group. To observe fracture surface with Scanning electron microscopy (JSM-6460),and observe blowhole Patterns and Porosity on 20 region of model,and investigate the change of microstructure after infiltration technique on four groups,to detect the model with Spectrophotometer (MINOLDA Datacolor SF300) and observe change of L*,a* and b* after after infiltration technique on four groups.3. To investigate the effect of presintering and infiltration technique to color on opaque porcelain of In-Ceram alumina substrate. In the basis of test two, post-slow-speed infiltrated group was considered as pre- slow-speed opaque porcelain group(n=10), post-fast-speed infiltrated group was considered as post- fast-speed opaque porcelain group(n=10),and after building masking porcelain,to check change of L*,a* and b* with Spectrophotometer (MINOLDA Datacolor SF300).4. To investigate the effect of presintering and infiltration technique to color on body porcelain of In-Ceram alumina substrate. Disc-shaped model were maken of In-Ceram alumina,In the basis of test three, the model were randomly divid into four groups, post-slow-speed building body porcelain group, post-fast-speed building body porcelain group, fast-speed control group and slow-speed control group,and after building opaque porcelain,to check change of L*,a* and b* with Spectrophotometer (MINOLDA Datacolor SF300) on four groups.Results:1. With Electron microscopy checking, microstructure have a Significant change after presintering and infiltration technique, crystal Particles of Alumina was 2～4μm before presintering and infiltration technique,and increased to3～7μm after presintering and infiltration technique in slow-speed presintering and infiltration group,and was 2～7μm and 9μm in fast-speed presintering and infiltration group. Particlec changed from irregular spheres and polygon to Cuboid trapezoid body,and volume was increased.At same time, internal structure of A1203 was Loose, Porosity was 9.02% before slow-speed presintering and infiltration technique with scanning electron microscopy checking,after slow-speed presintering and infiltration technique, blowhole of in slow-speed presintering and infiltration technique group was less,and distribution was even; blowhole was Scattered and irregular before presintering and infiltration technique in fast-speed presintering and infiltration technique group, Porosity was 7.91%, blowhole was Clustered after fast-speed presintering and infiltration technique technique. Porosity was higher in slow-speed presintering and infiltration groups after presintering and infiltration technique. Porosity was 0.25% after slow-speed presintering and infiltration technique,and 0.6% after fast-speed presintering and infiltration technique, Porosity was less in slow-speed presintering and infiltration group n fast-speed presintering and infiltration group.2. Score of L*,a* and b* was 45.23±5.14 ,0.38±0.08 and 11.6±0.89 before slow-speed presintering and infiltration technique,and was 64.13±6.25,0.56±0.13 and 14.9±1.62 after slow-speed presintering and infiltration technique, score of L*,a* and b* was40.23±5.13, 0.45±0.07 and 10.1±0.95 before fast-speed presintering and infiltration technique, and was 59.23±5.14,0.49±0.17 and 13.6±1.24 after fast-speed presintering and infiltration technique.Increasing of L*,a* and b* was significant in slow-speed presintering and infiltration group, Icreasing of L* and b* was significant in fast-speed presintering and infiltration group,and Increasing of a* was not significant.3. Score of L*,a* and b* was 64.13±6.25,0.56±0.13 and 14.90±1.62 before slow-speed building masking porcelain technique,and was 43.59±5.97,0.85±0.16 and 18.20±1.95 after slow-speed building masking porcelain technique, score of L*,a* and b* was 59.23±5.14,0.49±0.17 and 13.6±1.24 before fast-speed building masking porcelain technique,and was 40.12±4.77,0.91±0.18 and19.85±1.33 after fast-speed building masking porcelain technique, after slow-speed presintering and infiltration technique,score of L* was decreasing after fast or slow-speed presintering and infiltration technique, a* and b* was increasing. 4. Score of L*,a* and b* was not differencial after building body porcelain between experence groups and control groups,and△E was 0.83(<1.5), it Show that experence groups with slow-speed building body porcelain have a good replication on color of porcelain,Score of L*,a* and b* was difference to control group in fast-speed building body porcelain,△E was 1.64(>1.5),have a diffrence in naked eye, we believe that the fast-speed building body porcelain technique can not have a replication on natural color of porcelain.Conclusions:1. Slow presintering and infiltration technique can make In-Ceram alumina substrate more even and compact with comparatively lower porosity.2. Presintering and infiltration technique had significant effects on the color of In-Ceram alumina substrate. Slow presintering and infiltration technique have less effect on color.3. Presintering and infiltration technique had significant effects on the color of In-Ceram alumina substrate after building masking porcelain,and slow presintering and infiltration technique can relatively a less effect on color after building masking porcelain.4. All-ceramic restorations with slow presintering and infiltration technique can have a good rehabilitation on color ,and meet the needs of clinic,but effect of slow presintering and infiltration technique was opposite.
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