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 .
A prospective randomised clinical trial of one bis-GMA-based and two ormocer-based composite restorative systems in class II cavities: three-year results.
OBJECTIVES Ormocer composites , consisting of a silicon-based polymer , have been developed recently as a tooth-coloured restorative material . The purpose of this prospect i ve r and omised clinical trial was to evaluate the performance of two small-particle hybrid ormocer-based restorative systems ( AD , Admira/Admira Bond , VOCO ; DE , Definite/Etch & Prime 3.0 , Dentsply ) and one small-particle hybrid bis-GMA-based composite restorative system ( TC , Tetric-Ceram/Syntac , Ivoclar-Vivadent ) in occlusal stress-bearing restorations . METHODS One hundred and twenty-eight occlusal-proximal restorations ( 44 AD , 43 DE and 41 TC ) were placed according to the manufacturer 's instructions in thirty-two adult patients . Their clinical performance was scored according to the USPHS criteria and evaluation of bite-wing radiographs . RESULTS After 3 years , four AD , five DE and four TC restorations had failed due to fracture or marginal gap formation . Surface roughness improved significantly when compared to the baseline in AD and TC ( Friedman test , p<0.05 ) during the first year but returned to baseline values after 3 years . DE had a significant tendency towards discolouration ( p<0.05 ) . Bite-wing radiographs showed two AD and one TC restorations with internal porosities . ANOVA showed that larger restorations ( > or = 3 surfaces ) showed significantly more degradation than smaller ones . CONCLUSIONS In a group of class II restorations , there was no significant difference in failures after 3 years between ormocer-based and bis-GMA-based restorative systems
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 .