The Silica Gel Gap Stamp Examination Porcelain-fused-to-metal Crown Fitness Feasibility Study

PurposeThis study is the gypsum generation of gap stamp and the preparation body gap stamp scanning, through the computation analysis, tests and compares two kind of situations the grades of fit. Obtains one kind of examination metal by the time in the clinical operating process to porcelain - fused - to - metal crown suiting to be simpler but the accurate method, the main focus is methodological research.MethodsStochastically extracts in the outpatient service must improve looks in front of repair case of illness tooth 45 (24 golden alloy to roast porcelain crown, 21 nickel chromium alloys roast porcelain crown) , the conventional tooth body preparation, takes the stamp, duplicates the ultra anhydrite model, the manufacture porcelain — fused - to - metal crown. After the porcelain - fused - to -metal crown to do completes, carries on the clean, again uses75% ethyl alcohol to porcelain - fused - to - metal crown in the crown to carry on the disinfection, the corresponding gypsum generation carries on the clean, by removes the impurity disturbance. Will pour into the metal with the high fluid silica gel to porcelain - fused - to - metal crown to wear to the gypsum generation on causes it to take place, after waits the silica gel to harden porcelain - fused - to - metal crown on to take down from the gypsum generation, again takes down already the silica gel thin film from the crown which forms, this thin film namely for gypsumgeneration of gap stamp;Will adjust well can take place completely porcelain -fused -to - metal crown to use 75% ethyl alcohol to carry on the disinfection once more, after will air - dry pours into the high fluid silica gel the porcelain -fused - to - metal crown once more in the porcelain - fused - to - metal crown to wear to on the process cleaning up disinfection preparation tooth body causes it to take place completely, after waits the silica gel to harden the silica gel thin film which will take down from the crown forms, this thin film namely for will prepare the body gap stamp. Manufactures seven kind of different thickness standards the silica gel thin film, after the scanner scanning, then uses the pho-toshop 8.0 imagery processing software reading the luminance value, then obtains the luminance value and the silica gel film thickness straight line regression equation. In the identical tooth position obtains two silica gels gaps stamp with the scanner scanning image, then obtains the gap stamp lip surface with the pho-toshop 8.0 imagery processings software to cut the reason and the shoulder & near center point, the center point, the far center point and the near far center edge line center point silica gel thin film image luminance value separately, each spot surveys 3 times of averaging values. Then these eight spots survey luminance value averages the value to take this lip surface silica gel thin film again the luminance value. At the same time uses the photoshop 8. 0 imagery processings software direct readout lip surface whole the luminance value. Using the regression equation which obtains transformed the silica gel thin film luminance value into thin film thickness. Compared with the lip surface gap stamp which obtains through the measuring point with the lip surface gap film thickness which obtains directly whether does have the difference, at the same time compares the gypsum generation of gap stamp and the preparation body gap stamp thickness difference. To scans after with the SPSS10. 0 software package gap stamp thickness to carry on the single factor variance analysis comparison, analyzes suiting scope and difference which in two kind of situations reflected.ResultThe experimental result showed that: (1) the scanner and the photoshopsoftware can precisely reflect the silica gel membrane in the micron level thickness change. (2) the high fluid silica gel stamp material thickness change and the luminance value change is inverse correlation. (3) front the tooth lip surface cuts the reason and the shoulder's near center point, the center point, the far center point and the near far center edge line center point silica gel thin film thickness mean value and between the lip surface whole silica gel thin film thickness not the obvious difference (P > 0. 05) , this also is the explanation may represent this lip surface whole on the front tooth lip surface silica gel thin film these eight thickness mean value the thickness. (4) the generation of gap stamp and the preparation body gap India membrane two between does not have the significance difference ( P > 0. 05 ). May represent the preparation body gap membrane completely from this the proof gypsum generation of gap stamp, for next step conducts the relativity research with the classical grade of fit measuring technique to build the good foundation.ConclusionThe high fluid silica gel gap stamp survey suiting method to be feasible, but also needs further to conduct the relativity research with the classical grade of fit measuring technique.The general scanner and the photoshop imagery processing software can the precise reflection silica gel thin film micron level thickness change.