SIGNIFICANCE This study did not identify clear advantages of using the first generation of ormocer-based fillings rather than conventional composites .
OBJECTIVES In-vitro experiments on  ormocers ( ORganically MOdified CERamics )  have provided controversial results .
Consequently , the objectives of this meta- analysis were to ( 1 ) compare clinical performances of first generation ormocers versus conventional composite restorations  , ( 2 ) explore the influence of various clinical factors and the impact of the quality of studies on published results .
Color stability of nanohybrid resin-based composites, ormocers and compomers
Objective The aim of this study is to evaluate the color stability of two nanohybrid resin-based composites , two organic modified ceramic resin composites ( ormocers ) and a compomer , following their immersion during 4 weeks in four usual drinks . Material and methods Forty discs of each of the following material s were prepared : Gr and ioSO ( GR ) , Esthet X ( EX ) , Dyract EXTRA ( DY ) , Ceram X duo ( CX ) , and Admira Fusion ( AD ) . The discs were polished and stored in distilled water during 24 h at 37 ° C . Color according to the CIEL*a*b * scale was recoded . Ten r and omly selected sample s of each material were immersed in red wine ( RW ) , coffee ( CF ) , cola ( CK ) , and distilled water ( DW ) . The color was recorded after 1 , 7 , 21 and 28 days of immersion . The ΔE values between the baseline color and each of the study timepoints were calculated . The data were analyzed based on the Kruskal-Wallis test , Wilcoxon test , and Mann-Whitney U test . Results After 1 day of immersion , all the material s showed ΔE > 3.3 , except EX , CF , and CX in CK . RD was the most staining beverage ( ΔE 15.36 to 31.09 ) . EX and CX were significantly less stained than the rest of the material s ( p < 0.05 ) . Conclusions All the staining solutions produced darkening beyond clinical ly acceptable limits . EX and CX were the material s who experimented less staining , followed by GD . AD and DY were the material s more stained . RW was the drink that produced more staining , followed by CF and CK . Clinical relevance After 24 h of immersion in all the solutions , equivalent to 1 month of exposure in the mouth , the evaluated material s showed clinical ly unacceptable ΔE values
SIGNIFICANCE This study did not identify clear advantages of using the first generation of ormocer-based fillings rather than conventional composites .
OBJECTIVES In-vitro experiments on  ormocers ( ORganically MOdified CERamics )  have provided controversial results .
Consequently , the objectives of this meta- analysis were to ( 1 ) compare clinical performances of first generation ormocers versus conventional composite restorations  , ( 2 ) explore the influence of various clinical factors and the impact of the quality of studies on published results .