Color Stability of Ceramic Veneers Luted With Resin Cements and Pre-Heated Composites: 12 Months Follow-Up

Abstract

The objective was to evaluate the color stability of ceramic veneers luted with resin cements and pre-heated composite resins (60oC) for 12 months, and determine the degree of conversion (DC) of the luting agents. Two resin cements (AllCem Veneer, light-cured (LRC) and AllCem, dual-cured (DRC)] and three composite resins [Z100 (MNCR-minifilled), Herculite Classic (MHCR-micro-hybrid) and Durafill (MCCR-microfilled)] were used for cementing 0.8-mm-thick lithium-silicate glass-ceramic laminates (Suprinity, shade B2-HT, Vita) on bovine enamel (n=10). The specimens were stored at 37oC in distilled water. CIELab parameters were determined at 24h after luting (baseline), 7, 30, 90, 180 days and 12 months. Three specimens were prepared for DC evaluation, performed by micro-Raman spectroscopy. Data were analyzed by ANOVA and Tukey’s test (a=5%). For ΔEab and ΔE00, there were significant differences for luting material (p<0.001), time (p<0.001), and double interaction (p<0.001). The groups cemented with MHCR (1 year), MCCR (90 days and 1 year) and MCCR-PH (1 year) were the ones with ΔE values greater than the acceptability threshold. All other groups maintained their ΔE lower than the acceptability threshold after 1 year in distilled water. Regarding DC, there were no significant differences (p=0.127) among the materials. Non-significant negative correlations were observed between the mean ΔEab and DC (R=-0.65) and ΔE00 and DC (R=-0.64). A significant positive correlation was observed mean ΔEab and ΔE00 (R=0.99). It was concluded that the different luting agents influenced the final color of the restorations. The heating of the composite resins did not affect their DC.

Selected Spectroscopic Techniques for Surface Analysis of Dental Materials: A Narrative Review

“…Raman spectroscopy was used to determine the rate of polymerization of bioglass ceramic [ 105 ], identification and testing of the presence of various compounds in implant materials [ 106 ], ceramics [ 107 , 108 , 109 ], bioglass [ 110 ]; analysis of the phase composition of bioglass [ 111 ], ceramics [ 112 , 113 ]; and evaluation of the degree of conversion of resins [ 114 ] and ceramics [ 115 ].…”

Impact of resin composite cement on color of computer‐aided design/computer‐aided manufacturing ceramics

“…A varying layer thickness or the shade of the tooth stump can additionally influence the esthetics significantly 14‐16 . The esthetics of diverse ceramic restoration, however, can also be influenced to some extent by the shade of the underlying resin composite cement (RCC), 14,16‐21 whereby color differences are reduced with increasing layer thickness of the ceramics 14,19,22 …”

“…Latter can be adhesively bonded or traditionally cemented, whereas in thinner layer thicknesses and esthetic areas, RCC should be preferred 23,24 . Adhesive bonding procedures can be performed either with light or dual‐cured resin composites with slight differences in color stability, 21 whereas compounds such as reactive groups of tertiary amines and inhibitors may cause more changes in color in dual‐curing materials into yellowish and reddish, especially after aging 25‐28 …”

Influência da composição monomérica e do pré-aquecimento na viscosidade, grau de conversão, propriedades mecânicas e ópticas de resinas compostas experimentais

“…Por isto apresentam menor viscosidade, porém suas propriedades mecânicas são inferiores (16). Logo, espera-se que a cimentação com resina restauradora apresente vantagens como propriedades mecânicas superiores aos cimentos resinosos, menor custo e fácil acesso, além das maiores opções de cor (12,13,25,(61)(62)(63)(64)(65). Como estudos indicam que as propriedades físicas e mecânicas de resinas pré-aquecidas melhoram pelo aumento do GC, maiores ainda seriam os benefícios desta técnica (1, 8, 14).…”

“…Além disto, com o pré-aquecimento, o grau de conversão das ligações duplas de carbono da resina pode aumentar e levar a formação de um polímero mecanicamente mais resistente e quimicamente mais estável (7)(8)(9). Assim é esperado obter um compósito menos susceptível ao manchamento interno causado pela oxidação de componentes não reagidos (10)(11)(12).…”