Analysis of optical transmission by 400–500 nm visible light into aesthetic dental biomaterials

Watts, D.C.; Cash, A.J.

doi:10.1016/0300-5712(94)90014-0

Cited by 117 publications

(84 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[8][9][10] Mismatch of translucency and color of the core and veneering system in a ceramic system with that of natural enamel that has inherent translucency can be considered a failure. [11][12][13][14][15][16][17][18] The translucency of tooth-coloured restorative materials has usually been determined with the translucency parameter (TP). 16,19 Ceramic translucency and color can be affected by many properties, including ceramic thickness, crystalline structure, number of ceramic firings, veneering technique, repeated ceramic staining cycles, grain size, pigments, number, size and distribution of defects, and porosity.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Akar

Pekkan

Çal

et al. 2014

The Journal of Prosthetic Dentistry

View full text Add to dashboard Cite

STATEMENT OF PROBLEM Surface-finishing protocols have a mechanical impact on ceramic surfaces that could eventually affect surface topography and light scattering. An optimum protocol is needed to avoid damaging the optical properties of ceramics. PURPOSE The purpose of this study was to determine the effects of different surface-finishing protocols on the surface roughness, color change, and translucency of ceramic and metal ceramic restorations. MATERIAL AND METHODS Standardized disk-shaped specimens (1.5 × 10 mm, n=128) were fabricated from 3 different ceramic core materials (aluminum oxide [Al2O3]-AL, zirconium oxide [ZrO2]-ZR, lithium disilicate [Li2Si2O5]-LIT), veneered (V) with dentin ceramics (n=32 per group), and placed in the following groups: ALV, ZRV, and LITV. The metal ceramic group acted as the control (n=32). Four different surface-finishing methods were tested. Airborne-particle abrasion with 50 m Al2O3, polishing with adjustment kit, polishing with adjustment kit plus diamond polishing paste, and autoglazing (n=8 subgroup) were applied on the veneering ceramics. The specimens were analyzed with a profilometer for surface roughness, and color change and translucency were measured with a clinical spectrophotometer. Statistical analyses were performed with 1-way ANOVA and the Tukey honest significant difference tests (=.05). RESULTS Specimens treated with the airborne particle abrasion method showed significantly higher mean profilometer for surface roughness values in all groups (P<.05). The polishing with adjustment kit and autoglazing methods revealed statistically similar surface roughness values in all groups (P>.05). With the diamond polishing paste method, lower surface roughness values were achieved in the ZRV and metal ceramic groups acted as the control groups. Different surface-finishing methods affected the color change of the ceramic systems, except for ZRV. Surface-finishing protocols significantly affected the translucency values of the ALV, LITV, and metal ceramic groups (P<.05). CONCLUSIONS No single surface-finishing protocol can be recommended to obtain the smoothest surface and the least color change without affecting translucency for the ceramics tested. The airborne-particle abrasion protocol created rougher surfaces and decreased translucency, and color change in zirconia was not affected by the finishing protocols. Purpose. The purpose of this study was to determine the effects of different surface finishing protocols on the surface roughness, color change and translucency of all-ceramic and metalceramic restorations. Materials and methods.Standardized disc-shaped specimens (1.5 mm x 10 mm, N=128)were fabricated using three different all-ceramic core materials (Al 2 O 3 -AL, ZrO 2 -ZR, Li 2 Si 2 O 5 -LIT) materials and veneered (V) with dentin ceramics (n=32 per group) constituting the following groups: ALV, ZRV, LITV. Metal-ceramic group acted as the control (MC) (n=32). Four different surface finishing methods were tested: Air-borne particle abrasion (AB) with 5...

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Akar

Pekkan

Çal

et al. 2014

The Journal of Prosthetic Dentistry

View full text Add to dashboard Cite

show abstract

“…Upon irradiation by a blue curing light, the light will be scattered by the distributed filler particles and pigments and absorbed by the photoinitiators and pigments. This means that as light passes through the composite resin, light intensity is attenuated, thereby resulting in reduced irradiance and curing effectiveness [1][2][3][4] . In light-curing composite resins, polymerization is initiated by the photoinitiator that absorbs the photons.…”

Section: Introductionmentioning

confidence: 99%

The effect of resin shades on microhardness, polymerization shrinkage, and color change of dental composite resins

et al. 2009

View full text Add to dashboard Cite

The present study sought to evaluate the effect of resin shades on the degree of the polymerization. To this end, response variables affected by the degree of polymerization were examined in this study -namely, microhardness, polymerization shrinkage, and color change. Two commercial composite resins of four different shades were employed in this study: shades A3, A3.5, B3, and C3 of Z250 (Z2) and shades A3, A3.5, B3, and B4 of Solitaire 2 (S2). After light curing, the reflectance/absorbance, microhardness, polymerization shrinkage, and color change of the specimens were measured. On reflectance and absorbance, Z2 and S2 showed similar distribution curves regardless of the resin shade, with shade A3.5 of Z2 and shade A3 of S2 exhibiting the lowest/highest distributions. Similarly for attenuation coefficient and microhardness, the lowest/highest values were exhibited by shade A3.5 of Z2 and shade A3 of S2. On polymerization shrinkage, no statistically significant differences were observed among the different shades of Z2. Similarly for color change, Z2 specimens exhibited only a slight (ΔE*=0.5-0.9) color change after immersion in distilled water for 10 days, except for shades A3 and A3.5. Taken together, results of the present study suggested that the degree of polymerization of the tested composite resins was minimally affected by resin shade.

show abstract

“…Even with modern high intensity light activation units there is a high degree of inefficiency in the transmission of visible light into and through aesthetic restorative materials. 12 There is an exponential decrease in light energy as composite or dentine thickness increases. 13 Thus deep or undercut cavity preparations pose difficulties for effective light activation of restorative materials.…”

mentioning

confidence: 99%

A pilot investigation of operator variability during intra-oral light curing

et al. 2002

View full text Add to dashboard Cite

Objective To test the hypothesis that operator experience influences the efficacy of light curing in a typical posterior intra-oral location. To investigate whether short cure cycles affect performance. Design A cross-sectional single-centre study designed to assess the efficacy of experienced and inexperienced operators when undertaking simulated intra-oral curing. Setting An in vitro laboratory based investigation conducted in a dental school during 2001. Materials and methods A computer-based technique was used to monitor light intensity in a clinical simulation. Dentists and student operators were tested for their ability to cure a posterior restoration effectively. Relative light intensity was assessed against time for each operator and test run. Results Experienced (qualified) operators produced more effective and consistent cure results than less experienced undergraduate students. Operator performance was not affected by variations in irradiation time. Conclusions This cross-sectional pilot investigation demonstrates that operator experience is a factor in successful clinical photo-curing of posterior restorations. Stable and accurate light guide positioning are required throughout the entire irradiation cycle to optimise intra-oral cure of light-activated restorations. Further investigations are planned to assess the potential of this novel method of assessment for use as a routine teaching aid in clinical practice.Direct placement resin-based composites are increasingly being used as an alternative to dental amalgam for the restoration of cavities in posterior stress bearing situations. [1][2][3][4] Whilst the rate at which dentistry is entering the post amalgam-age varies according to country 1-4 the trend is set to continue as clinicians are increasingly being asked to satisfy the expectations of patients who seek safe, biocompatible and affordable tooth-coloured restorations. 3

show abstract

Analysis of optical transmission by 400–500 nm visible light into aesthetic dental biomaterials

Cited by 117 publications

References 13 publications

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

The effect of resin shades on microhardness, polymerization shrinkage, and color change of dental composite resins

A pilot investigation of operator variability during intra-oral light curing

Contact Info

Product

Resources

About