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 .
Ormocer: An aesthetic direct restorative material; An in vitro study comparing the marginal sealing ability of organically modified ceramics and a hybrid composite using an ormocer-based bonding agent and a conventional fifth-generation bonding agent
Aims and Objectives : To compare the marginal sealing ability of ormocer with a hybrid composite using an ormocer based bonding agent and a conventional fifth generation bonding agent . Material s and Methods : Fifty four human premolars were r and omly distributed into four test groups of 12 teeth each and two control groups of 3 teeth each . Class I occlusal preparation of 1.5 mm depth were made in each tooth . These were restored using the adhesive and restorative material according to the group . The restorations were finished using a st and ard composite finishing and polishing kit . Thermocycling between 5 ° C and 55 ° C was carried out . Having blocked the root apex and the entire tooth surface except 1 mm around the restoration margin , the teeth were immersed in 2 % methylene blue for 48 hours , after which the dye penetration through the margins of each sample was studied under a stereomicroscope . Results and Discussion : Group IV ( Admira with Admira Bond ) showed the minimum marginal leakage with a mean of 0.200 mm . Four sample s in this group showed no microleakage at all and a maximum of 0.400 mm was seen in one sample . Group II ( Spectrum TPH with Admira Bond ) showed the maximum leakage with a mean of 0.433 mm . One sample showed as much as 1.00 mm of microleakage .  Admira when used with Admira Bond showed lesser microleakage than Spectrum TPH used with Prime & Bond NT , the difference being statistically insignificant
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 .