Clinical Research Of Front Teeth Pure Titanium Porcelain Crowns On Color

Objective:Through the color plate (visual colorimetric)and Crystaleyespectrophotometer colorimetric instrument (Instrument colorimetric)identifiedthe color of the front teeth which patients need to repair. Observe the changeof color after pure titanium PFM crown entranced in oral, explore the rule ofchangement, provide clinical basis for the production of pure titaniumporcelain crowns.Methods：1materials and test equipment1.1materials: DUCERATIN KISS(Dentstly) porcelain powder, pure titaniumceramic alloy1.2equipment: dell computer, Crystaleye all dental spectrophotometercolorimetric instrument (OLYMPUS company, Japan), Vitapan Classical colorplate (Vita company, Germany)2the research objectSelect106clinic patients who want to repair front teeth in hebei medicaluniversity Oral hospital rehabilitation clinic,51cases of men,55cases ofwomen, the age is between20-77.Inclusion criteria: the demand is natural teeth or on the side of the samename natural teeth, completly without defect, no spots, no stones, color andshape are normal, color measurement site developed normally, no decay, nosoft dirt, no bleaching, no cover history, the surface of live pith teeth isclean,with teeth are discolored teeth, residual root or residual crown.3methord of useFirst dispatch focal length to T, close the cover, press the middle buttonfor instrument calibration. Connecting film cassette, doctors hold the workhead body, pick the tooth, teeth vertical photographed in cassette probe, measure tip tooth the probe towards down, measure lower tooth The probetowards up. Press the middle button to finish. Colorimetric results showed inthe computer software.Crystaleye colorimetric instrument should be paid attention to use:(1)make sure JiaoHuan aimed at the "T" position;(2) the subjects should begently biting cassette front-end prominent part, this part can determinewhether bite to the location of the bumps, the tooth cut end of the tooth shouldbe located in the inside of the small bumps (3) when shooting, the light willappear in teeth two white and light belt, the almost far lighter belt should besymmetrical on the teeth surface (4) when filming, teeth should be measuredin the center of the picture; if you do not standard this shooting method, thedetermination results may have error.Crystaleye spectrophotometric color meter comes with standard D65light source, this standard light source can avoid the limitations of visualsusceptibled interference, the colours of the natural tooth surface is convertedinto digital information, it can objectively and accurately record in thecomputer. At the same time its analysis system carries the VITA classical,VITA3d-Master, Noritake, Ivoclar Vivadent Ch romascop and NCC, a totalof five kinds of color board information, optional color range.4The determination of colorsThe patients of eligibled for screening, cleaning tooth surface beforecolor measurement, remove pigmentation, smoke plaque, tartar, soft dirt, andkeep natural luster, through colorimetric instrument with a computer to shootnormal tooth which need to be repaired in the other side and color plate, lipsurface in a third parts for color measurement. When using color board,colormeasurement needs the abutment teeth preparation by the same doctor,thetime demand from9:30to16:30in the morning sunshine condition, thereference is adjacent teeth or contralateral teeth with the same visualcolorimetric (with VITA colorimetric board), the selected color plate,theoutcomes of the visual colorimetric have no difference,give the dentallaboratory technician to make pure titanium porcelain crowns.the colorimetric instrument with a computer labial surfaces of pure titanium porcelain crownsmeasure a third, at the same time record the visual colorimetric percentageand colorimetric results consistent with computer.5statistical analysisStatistical analysis using SPSS13.0statistical analysis software, recordsthe consistent percentage between visual colorimetric and computer color;through the analysis of the delta E value before and after,discussing if there isa color difference in pure titanium porcelain crowns.Through the changementof L*A*B*value, to discuss whether there is a regularity in the error ofpure titanium after PFM crowns madeResults:1select the106production of pure titanium porcelain crowns, computercolor results are in agreement with the visual colorimetric results.There are54cases totally.22cases of male,32cases of female, accounting for50.94%of the total number of samples. The54cases including A1color14cases, A2color17cases, A3color6cases, A3.5color6cases, B1color6cases, B4color5cases2Put the pure titanium porcelain crowns entrancing oral, Crystaleyespectrophotometer colorimetric instrument were used to determine the colorasurement, found that11people PFM color have differences with visualcolorimetric and instrument consistent results,4cases are male,7cases arefemale, accounting for20.37%of the total number of cases. Color differencein male patients accounted for18.18%, in female patients accounted for21.88%. Women with PFM crown produce off color is slightly more thanmen.3The pure titanium porcelain crowns which color have been changedincluding A1color3cases, A2color5cases, A3color1case, A3.5color1case, B1color1case.3cases of A1color pure titanium porcelain crowns aremade into A2,5cases A2color pure titanium porcelain crowns respectivelydiscoloration are A1, A3, A3, B1, B4,1case A3color are made into A2,1case of A3.5color are made into A3,1case of B1are made to A1color color. A1discoloration rate was21.43%, the A2discoloration rate was29.41%, theA3color change at a rate of16.67%, A3.5discoloration rate was16.67%, theB1discoloration rate was16.67%.4through spss13.0statistical software calculation,11cases of PFMcrown made before and after the delta E value are2.71,3.91,3.79,1.93,2.17,3.05,3.15,3.68,3.76,4.68,4.81.With the naked eye can discern the colordifference.5The L*a*b*value of porcelain crowns are higher than the swatches,but does not change significantly in L*and b*, prompt pure titaniumporcelain crowns are reder than vita color plate, its brightness is slightlyhigher than the color plate, but the difference is not obviousConclusion：1visual colorimetric and instrumen colorimetric are different, visualcolor are affected by color plate, color environment, perception ability andjudgment, In this study the vita color plate and Crystaleye spectrophotometriccolor natural tooth color measurement instrust on the same patients， thesame consistent50.94%as a result, it can be seen that using the two differentmethods and the results have obvious difference.2The pure titanium porcelain crowns of vita colorimetric boardconsistent with Crystaleye spectrophotometer colorimetric instrument, putinto the patient’s oral, after making, use of Crystaleye spectrophotometercolorimetric instrument measure the color again, the color aredchanged,20.37%of PFM crown color changed, the delta E change to3.42onaverage. The L*a*b*value of pure titanium porcelain crowns are higher thanvita color plate, the L*b*value change lightly, a*value change is obvious.