Effect of aging on color and whiteness of single shade and group shade resin composites in restorations with different cavity configurations Bibiana Gabardo Perez Mariano da Rocha, Oscar E. Pecho, Letícia Brandão Durand, Javier Ruiz-López, María M. Pérez Dental Materials, 2026 OBJECTIVES: To evaluate the effect of aging on the color and whiteness of single- and group- shade resin composites in restorations with different cavity configurations and dental shades. METHODS: =1.8 and WAT = 2.6) thresholds were used for the analysis of the results. RESULTS: and WAT values for Class I restorations. CLINICAL SIGNIFICANCE: The influence of cavity configuration on color and whiteness stability indicates that restoration geometry should be considered when predicting long-term shade matching and esthetic durability of single- and group-shade composites."
Over-the-counter products in tooth bleaching: A scoping review Laryssa Mylenna Madruga Barbosa, Mônica Barbosa Gonçalves Amâncio Filha, Juan Vitor Costa Leite, João Vitor do Nascimento Santos, Jamyle Moura De Medeiros, Isabelle Lins Macedo De Oliveira, Oscar E. Pecho, Sônia Saeger Meireles, Renally Bezerra Wanderley Lima Journal of Dentistry, 2024
Optical properties of dental zirconia, bovine dentin, and enamel-dentin structures Oscar E. Pecho, Paula Benetti, Javier Ruiz‐López, Giordana P. Furini, Maria Tejada‐Casado, María M. Pérez Journal of Esthetic and Restorative Dentistry, 2024 ObjectiveTo evaluate the optical properties and the relative translucency parameter of Ceramill ZI White (3Y‐TZP) and Ceramill Zolid FX White (5Y‐PSZ) zirconia ceramic systems and compare them with those of the bovine dentin and enamel/dentin structures.Materials and Methods3Y‐TZP and 5Y‐PSZ zirconia ceramic systems were evaluated. A 0.5‐mm‐thick 3Y‐TZP (3Y‐NC.5), 0.5‐mm‐thick (5Y‐NC.5), and 1.4‐mm‐thick (5Y‐C.14) were used. A 0.5‐mm‐thick dentin specimens and 1.4‐mm‐thick enamel/dentin specimens (n = 5) were obtained from anterior bovine maxillary teeth. Scattering, absorption, transmittance, and albedo coefficient were calculated using Kubelka–Munk's model. Data were statistically analyzed using Kruskal–Wallis and Mann–Whitney tests (p < 0.001), and goodness‐of‐fit coefficient (GFC). Relative translucency parameter differences were evaluated using translucency thresholds.ResultsReflectance, scattering, absorption, and transmittance properties were wavelength dependent. Good matches (GFC ≥ 0.999) in spectral reflectance were observed between 0.5‐mm‐thick dentin and 1.4‐mm‐thick enamel/dentin, and 3Y‐NC.5 and 5Y‐NC.5. Scattering was the main optical extinction process during light interaction with zirconia and dental structures, as indicated by albedo coefficient. Translucency differences were acceptable only for 3Y‐NC.5 and the dentin structure, and 5Y‐C.14 and the enamel/dentin structure.ConclusionsOptical properties of 3Y‐TZP and 5Y‐PSZ dental zirconia differed from each other and from bovine dental structures. Nevertheless, 3Y‐TZP showed similar relative translucency parameter to bovine dentin.Clinical SignificanceTo achieve the best esthetic results in restorative dentistry, it is crucial for clinicians to know about the optical properties of 3Y‐TZP and 5Y‐PSZ and to be able to compare these properties with those of dental structures.
Reliability of the color measurement of resin composites using images obtained using a stereoscopic loupe Alexsandra Santos ALBUQUERQUE, Rafaella BRAGANÇA, Oscar Emilio PECHO, André Luis FARIA-E-SILVA Brazilian Oral Research, 2024 This study assessed the reliability of a color measurement method using images obtained from a charge-coupled device (CCD) camera and a stereoscopic loupe. Disc-shaped specimens were created using the composite Filtek Z350 XT (shades DA1, DA2, DA3, and DA4) (n = 3). CIELAB color coordinates of the specimens were measured using the spectrophotometer SP60 over white and black backgrounds. Images of the same specimens were taken using a CCD camera attached to a stereoscopic loupe. The color of the image was measured (red-green-blue [RGB]) using an image processing software and converted to CIELAB coordinates. For each color coordinate, data from images were adjusted using linear regressions predicting those values from SP60. The whiteness index for dentistry (WID) and translucency parameter (TP00) of the specimens as well as the color differences (ΔE00) among pairwise shades were calculated. Data were analyzed via repeated-measures analysis of variance and Tukey's post hoc test (α = 0.05). Images obtained using the loupe tended to be darker and redder than the actual color. Data adjustment resulted in similar WID, ΔE00, and TP00 values to those observed for the spectrophotometer. Differences were observed only for the WID of shade DA3 and ΔE00 for comparing DA1 and DA3 over the black background. However, these differences were not clinically relevant. The use of adjusted data from images taken using a stereoscopic loupe is considered a feasible method for color measurement.
Analysis of Topography, Flexural Strength, and Microstructure of a Lithium Disilicate Glass-Ceramic After Surface Finishing Giordana Picolo Furini, Oscar E. Pecho, Pedro Álvarez-Lloret, Paula Benetti International Journal of Prosthodontics, 2024 PURPOSE: To investigate the influence of finishing, polishing, and glazing on the roughness, flexural strength, and microstructure of lithium disilicate glass-ceramics. MATERIALS AND METHODS: LD CAD/CAM blocks were cut into 96 discs (1.2 × 12 mm). After crystallization, a layer of glaze was applied to the discs' surfaces. The specimens were randomly divided into eight groupsn = 12) for different surface treatments (glaze [G], diamond abrasion [D], find diamond abrasion [F], and polishing [P]): G(glaze, control), GD, GDG, GDP, GF GFG, GFP, and GDFP. Mean roughness (Ra), mean square height (Rq), and maximum roughness (Rz) were measured. The biaxial flexural strength test was performed in a universal testing machine at 0.5 mm/minute. Microstructural analysis was performed using x-ray diffraction patterns (XRD). Differences on the roughness obtained in distinct groups was analyzed with Kruskal-Wallis and Bonferroni tests (α = .05). The flexural strength tests were compared with one-way ANOVA. RESULTS: Glazed groups (G, GDG, and GFG) presented the lowest surface roughness, lower crystallinity, and higher flexural strength than the other groups. Although polishing and glaze presented similar surface roughness, polishing protocol decreased the flexural strength compared to the control group G. CONCLUSIONS: Clinically adjusted LD glass-ceramic restorations should be reglazed whenever possible to improve strength.
The influence of smoking on the effectiveness of at-home bleaching: A prospective clinical study Rodrigo Rohenkohl Silva, João Paulo de Carli, Alvaro Della Bona, Kauê Faria Collares, Oscar Emilio Pecho, Sônia Saeger Meireles, João Renato Dieterich Júnior, Paula Benetti Journal of Esthetic and Restorative Dentistry, 2023 ObjectivesTo evaluate the effect of smoking on tooth whitening and color change after at‐home bleaching.Materials and MethodsThis prospective clinical study evaluated two groups of participants: NS—non‐smokers (n = 24) and S—smokers (n = 16). All subjects were treated with at‐home bleaching using 22% carbamide peroxide (CP) for 1 h/day for 14 days. Color coordinates (L*—luminosity, a*—red‐green axis and b*—yellow‐blue axis) were obtained before bleaching (D0—baseline), 1 day (D1), 15 days (D15), and 1 month (D30) after bleaching. The whiteness index (WID) and CIEDE2000 color differences (ΔE00) were calculated for S and NS. Color changes between S and NS subjects for specific teeth (CI—Central Incisors, LI—Lateral Incisors, and C—Canines) were analyzed using the Mann–Whitney test (α = 0.05).ResultsThere was no significant difference in WID between S and NS subjects at baseline. NS participants showed higher WID than S at D1, D15, and D30 (p < 0.05). NS showed higher ΔWID for CI and C between D0 and the other evaluation times (D1, D15, and D30) compared to S. Smokers showed higher darkening of CI than NS in ΔWID D30–D1 (p < 0.05). Color changes showed similar overall behavior for ΔWID. For all evaluation times, ΔWID and ΔE00 values were below the corresponding acceptability thresholds.ConclusionAt‐home bleaching was effective on smokers and nonsmokers. Smoking negatively affected color stability after bleaching. ΔE00 and ΔWID were acceptable for both groups.Clinical SignificanceAlthough smoking negatively affected color stability after bleaching, the observed changes were clinically acceptable.
Masking ability of CAD/CAM monolithic ceramics: effect of ceramic type and thickness, and try-in paste shade Eduarda Fachinetto, Gratcheva Falcão Chiapinotto, V. M. Barreto, O. Pecho, G. Pereira, A. Bacchi Quintessence International, 2023 PURPOSE This in vitro study evaluated the color differences when discolored tooth substrates were restored with CAD-CAM monolithic ceramics depending on ceramic type and thickness, and the try-in paste shade. METHODS Six ceramic types were tested: high-translucent lithium disilicate (LD-HT); medium-translucent lithium disilicate (LD-MT); low-translucent lithium disilicate (LD-LT); low-translucent leucite (LC-LT); feldspathic ceramic (FC); BL1 low-translucent lithium disilicate, stained to A1 shade (LD-BL1-LT). The ceramics were tested in disc-shaped specimens with 0.5, 1.0, and 1.5mm thickness (n=10; N= 180; shade A1). The try-in pastes tested to simulate luting materials corresponded to colors A1 and opaque white (OW). Six substrates were used: A1 (reference), B2, B3, A3, C2, and C3. Color differences (ΔE00) and translucency parameter (TP00) were assessed with the CIEDE2000 formula. The results were compared with acceptability (AT = 1.77) and perceptibility (PT = 0.81) thresholds. RESULTS Ceramic type, thickness, and the try-in paste shade influenced the color differences. LD-LT and LC-LT ceramics and OW try-in paste provided, in general, lower ΔE00 values. The most adequate ceramic thickness varied according to the substrate discoloration. With 1.0 mm of ceramic thickness, it was possible to obtain ΔE00 lower than the PT for substrates C2 and A3, and ΔE00 lower than the AT for C3 and B3. ΔE00 lower than the AT were obtained with 0.5mm of ceramic thickness for B2, A3, and C2. CONCLUSION The use of low-translucent glass-ceramics and opaque white try-in paste are useful to reduce color differences. The most adequate ceramic thickness depends on the substrate discoloration.
Masking ability of resin composites: A scoping review Bibiana Gabardo Perez, Bruna Gaidarji, Danielle Zorzo Righes, Oscar E. Pecho, Gabriel Kalil Rocha Pereira, Letícia Brandão Durand Journal of Esthetic and Restorative Dentistry, 2023 ObjectiveTo map the existing evidence regarding the masking ability of resin composites.OverviewThe literature search was conducted electronically, based on the PRISMA Extension for Scoping Reviews—online protocol at https://osf.io/m2h67/ with no language or time restrictions. Two independent reviewers conducted the screening, and a third reviewer was consulted in case of disagreement. Studies that evaluated resin composite masking ability regardless of background, application technique, thickness, or number of layers were selected. The search found 2995 potentially eligible studies. After removal of duplicates (657), irrelevant articles (2323), 15 citations met the eligibility criteria based on title and abstract, and eight studies were included based on full text analysis (seven in vitro, and one case report). Acceptable masking ability is obtained by one layer of opaque shade resin composite or by the layering technique. A black background is masked with 1.0‐ to 2.0 mm‐thick layers of opaque shade resin composites. Masking of the C4 background is achieved with one layer of 0.5‐ to 1.5 mm‐thick opaque shade resin composite or by the layering technique using different combinations of enamel body and dentin shades with a final thickness of 1.5 mm.ConclusionsAcceptable masking of C4 shade background is achieved with one layer of opaque shade composite at least 0.5 mm‐thick or by different combinations of the layering technique, with a final thickness of 1.5 mm. Acceptable masking of the black background of the oral cavity is achieved with a resin composite of at least 1.0 mm opaque shade.Clinical SignificanceThe thickness of the resin composite layer required to achieve adequate masking is variable and depends on the translucency/opacity of the tested resin composites and the background shade.
Visual shade matching María del Mar Pérez Gómez, Juan de la Cruz Cardona Pérez, Razvan Ionut Ghinea, Oscar Emilio Pecho Yataco, Alvaro Della Bona Color and Appearance in Dentistry, 2020
Instrumental shade matching Razvan Ionut Ghinea, María del Mar Pérez Gómez, Luis Javier Herrera Maldonado, Oscar Emilio Pecho Yataco, Alvaro Della Bona Color and Appearance in Dentistry, 2020
Color science and its application in dentistry María del Mar Pérez Gómez, Razvan Ionut Ghinea, Ana María Andreea Ionescu, Oscar Emilio Pecho Yataco, Alvaro Della Bona Color and Appearance in Dentistry, 2020
Whiteness difference thresholds in dentistry María M. Pérez, Luis Javier Herrera, Francisco Carrillo, Oscar E. Pecho, Diana Dudea, Cristina Gasparik, Razvan Ghinea, Alvaro Della Bona Dental Materials, 2019
Researching in biomaterials optics Maria del Mar Pérez Gómez, Ana Maria Ionescu, Ana Yebra, Juan de la Cruz Cardona, Luis Javier Herrera, María José Rivas, Razvan Ghinea, Óscar E. Pecho Proceedings of SPIE the International Society for Optical Engineering, 2017
Adhesion to Dental Ceramics Alvaro Della Bona, Márcia Borba, Paula Benetti, Oscar E. Pecho, Rodrigo Alessandretti, João Cezar Mosele, Rafael Tagliari Mores Current Oral Health Reports, 2014
Color fuzzy set design for dental applications L.J. Herrera, O. E. Pecho, R. Ghinea, I. Rojas, H. Pomares, A. Guillen, Ana Ionescu, J. Cardona, R. Pulgar, M.M. Perez International Conference on Intelligent Systems Design and Applications Isda, 2014
Implant vs screw loading protocols in orthodontics: A systematic review Angle Orthodontist, 2006
RECENT SCHOLAR PUBLICATIONS
Effect of aging on color and whiteness of single shade and group shade resin composites in restorations with different cavity configurations B Gabardo Perez Mariano da Rocha, OE Pecho, L Brandão Durand, ... Elsevier , 2026 2026
Effect of aging on optical behavior and color of 3D printing resin-based dental restorative materials MM Pérez, C Espinar, OE Pecho, M Tejada-Casado, A Della Bona Journal of dentistry 157, 105734 , 2025 2025 Citations: 13
Effect of aging on optical behavior and color of 3D printing resin-based dental restorative materials MDM Pérez Gómez, C Espinar Pulgar, OE Pecho Yataco, ... Elsevier , 2025 2025
Influence of microstructure on optical properties of CAD-CAM lithium disilicate glass-ceramics OE Pecho, P Alvarez-Lloret, AM Ionescu, JC Cardona, R Ghinea, ... Dental Materials 40 (11), 1927-1936 , 2024 2024 Citations: 8
Analysis of Topography, Flexural Strength, and Microstructure of a Lithium Disilicate Glass-Ceramic After Surface Finishing. GP Furini, OE Pecho, P Álvarez-Lloret, P Benetti International Journal of Prosthodontics 37 (4) , 2024 2024 Citations: 6
Over-the-counter products in tooth bleaching: a scoping review L Barbosa, F Monica, ... Journal of Dentistry 104989, 1-9 , 2024 2024 Citations: 35
Optical properties of dental zirconia, bovine dentin, and enamel‐dentin structures OE Pecho, P Benetti, J Ruiz‐López, GP Furini, M Tejada‐Casado, ... Journal of Esthetic and Restorative Dentistry 36 (3), 511-519 , 2024 2024 Citations: 23
Reliability of the color measurement of resin composites using images obtained using a stereoscopic loupe AS Albuquerque, R Braganca, OE Pecho Brazilian Oral Research 38, e032 , 2024 2024 Citations: 4
The influence of smoking on the effectiveness of at‐home bleaching: A prospective clinical study RR Silva, JP de Carli, A Della Bona, KF Collares, OE Pecho, SS Meireles, ... Journal of Esthetic and Restorative Dentistry 35 (6), 869-877 , 2023 2023 Citations: 7
Masking ability of CAD/CAM monolithic ceramics: effect of ceramic type and thickness, and try-in paste shade E Fachinetto, GF Chiapinotto, VSM Barreto, O Pecho, GKR Pereira, ... Quintessence Int 54 (6), 442-450 , 2023 2023 Citations: 18
Masking ability of resin composites: A scoping review BG Perez, B Gaidarji, DZ Righes, OE Pecho, GKR Pereira, LB Durand Journal of Esthetic and Restorative Dentistry 35 (2), 333-344 , 2023 2023 Citations: 21
Influence of smoking on the effectiveness of at-home bleaching with 22% carbamide peroxide: A cohort study RR Silva, JP De Carli, OE Pecho, KF Collares, A Della Bona, SS Meireles, ... 2022
Color change of resin-based composites after in vitro bleaching protocols: A systematic review and meta-analysis ML Vidal, OE Pecho, K Collares, SBN Brandeburski, A Della Bona Operative Dentistry 47 (2), 149-162 , 2022 2022 Citations: 23
Comparison of visual shade matching and photographic shade analysis LF Rondón, R Ramírez, OE Pecho Journal of Esthetic and Restorative Dentistry 34 (2), 374-382 , 2022 2022 Citations: 32
Can Smoking affect Whiteness and Color Change after At-Home Bleaching? RR Silva, JP De Carli, OE Pecho, KF Collares, A Della Bona, ... Dental Materials 38, e35-e36 , 2022 2022
Applications of artificial intelligence in dentistry: A comprehensive review F Carrillo‐Perez, OE Pecho, JC Morales, RD Paravina, A Della Bona, ... Journal of Esthetic and Restorative Dentistry 34 (1), 259-280 , 2022 2022 Citations: 360
Experimental methodologies to evaluate the masking ability of dental materials: A systematic review RB Dos Santos, K Collares, SBN Brandeburski, OE Pecho, A Della Bona Journal of Esthetic and Restorative Dentistry 33 (8), 1118-1131 , 2021 2021 Citations: 39
Efficacy of color discrimination tests used in dentistry A Simionato, OE Pecho, A Della Bona Journal of Esthetic and Restorative Dentistry 33 (6), 865-873 , 2021 2021 Citations: 22
Effect of substrate and cement on the final color of zirconia‐based all‐ceramic crowns QN Sonza, A Della Bona, OE Pecho, M Borba Journal of Esthetic and Restorative Dentistry 33 (6), 891-898 , 2021 2021 Citations: 21
Influence of background color on color perception in dentistry JA Medeiros, OE Pecho, MM Pérez, F Carrillo-Pérez, LJ Herrera, ... Journal of dentistry 108, 103640 , 2021 2021 Citations: 56
MOST CITED SCHOLAR PUBLICATIONS
Zirconia as a dental biomaterial A Della Bona, OE Pecho, R Alessandretti Materials 8 (8), 4978-4991 , 2015 2015 Citations: 378
Optical properties of CAD–CAM ceramic systems A Della Bona, AD Nogueira, OE Pecho Journal of dentistry 42 (9), 1202-1209 , 2014 2014 Citations: 370
Visual and instrumental shade matching using CIELAB and CIEDE2000 color difference formulas OE Pecho, R Ghinea, R Alessandretti, MM Pérez, A Della Bona Dental materials 32 (1), 82-92 , 2016 2016 Citations: 367
Applications of artificial intelligence in dentistry: A comprehensive review F Carrillo‐Perez, OE Pecho, JC Morales, RD Paravina, A Della Bona, ... Journal of Esthetic and Restorative Dentistry 34 (1), 259-280 , 2022 2022 Citations: 360
Whiteness difference thresholds in dentistry MM Pérez, LJ Herrera, F Carrillo, OE Pecho, D Dudea, C Gasparik, ... Dental Materials 35 (2), 292-297 , 2019 2019 Citations: 264
Color and translucency of zirconia ceramics, human dentine and bovine dentine OE Pecho, R Ghinea, AM Ionescu, J de la Cruz Cardona, RD Paravina, ... Journal of dentistry 40, e34-e40 , 2012 2012 Citations: 202
Colour parameters and shade correspondence of CAD–CAM ceramic systems A Della Bona, OE Pecho, R Ghinea, JC Cardona, MM Pérez Journal of dentistry 43 (6), 726-734 , 2015 2015 Citations: 135
Implant vs screw loading protocols in orthodontics E Ohashi, OE Pecho, M Moron, MO Lagravere The Angle Orthodontist 76 (4), 721-727 , 2006 2006 Citations: 123
Influence of gender on visual shade matching in dentistry OE Pecho, R Ghinea, MM Perez, A Della Bona Journal of Esthetic and Restorative Dentistry 29 (2), E15-E23 , 2017 2017 Citations: 110
Recent Advances in Color and Whiteness Evaluations in Dentistry MM Pérez, OE Pecho, R Ghinea, R Pulgar, A Della Bona Current Dentistry 1 (1), 23-29 , 2019 2019 Citations: 99
Relevant optical properties for direct restorative materials OE Pecho, R Ghinea, EAN do Amaral, JC Cardona, A Della Bona, ... Dental Materials 32 (5), e105-e112 , 2016 2016 Citations: 97
Influence of composite type and light irradiance on color stability after immersion in different beverages V Alberton Da Silva, S Alberton Da Silva, OE Pecho, A Bacchi Journal of Esthetic and Restorative Dentistry 30 (5), 390-396 , 2018 2018 Citations: 94
Optical behavior of dental zirconia and dentin analyzed by Kubelka–Munk theory OE Pecho, R Ghinea, AM Ionescu, JC Cardona, A Della Bona, ... Dental Materials 31 (1), 60-67 , 2015 2015 Citations: 91
Lightness, chroma and hue differences on visual shade matching OE Pecho, MM Pérez, R Ghinea, A Della Bona Dental Materials 32 (11), 1362-1373 , 2016 2016 Citations: 89
Influence of surface roughness on the color of dental-resin composites R Ghinea, L Ugarte-Alvan, A Yebra, OE Pecho, RD Paravina, MM Perez Journal of Zhejiang University Science B 12 (7), 552-562 , 2011 2011 Citations: 86
Influence of Bleaching and Aging Procedures on Color and Whiteness of Dental Composites A Della Bona, OE Pecho, R Ghinea, JC Cardona, RD Paravina, MM Perez Operative Dentistry , 2019 2019 Citations: 80
Optical properties of supra-nano spherical filled resin composites compared to nanofilled, nano-hybrid and micro-hybrid composites MM Perez, C Hita-Iglesias, R Ghinea, A Yebra, OE Pecho, AM Ionescu, ... Dental Materials Journal 35 (3), 353-359 , 2016 2016 Citations: 80
Effect of hydrogen peroxide on color and whiteness of resin‐based composites OE Pecho, J Martos, KVA Pinto, KVA Pinto, RA Baldissera Journal of Esthetic and Restorative Dentistry 31 (2), 132-139 , 2019 2019 Citations: 71
Masking ability of indirect restorative systems on tooth-colored resin substrates MM Basegio, OE Pecho, R Ghinea, MM Perez, A Della Bona Dental Materials 35 (6), e122-e130 , 2019 2019 Citations: 68
Adhesion to dental ceramics A Della Bona, M Borba, P Benetti, OE Pecho, R Alessandretti, JC Mosele, ... Current Oral Health Reports 1 (4), 232-238 , 2014 2014 Citations: 63
