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 .
The use of Ormocer as an alternative material for bonding orthodontic brackets.
As new adhesives , composite resins , and bonding techniques were introduced , orthodontists adopted some of these innovations and added them to their armamentarium . The purpose of this study was to compare the shear bond strength ( SBS ) of two adhesive material s ; one with an organically modified ceramic matrix , Admira ( Voco , Cuxhaven , Germany ) and another that contains the traditional Bis GMA matrix namely Transbond XT ( 3 M Unitek , Monrovia , Calif ) . The new material s have a lower wear rate and are more biocompatible than traditional composites . Forty molar teeth were r and omly divided into two groups : 20 teeth bonded with the Transbond adhesive system  and the other 20 teeth with the Admira bonding system .  Student 's t-test was used to compare the SBS of the two adhesives . Significance was predetermined at P < or = .05 . The results of the t-test comparisons ( t = 0.489 ) of the SBS indicated that there was no significant ( P = .628 ) difference between the two adhesives tested . The mean SBS for Admira was 5.1 + /- 3.3 MPa and that for Transbond XT was 4.6 + /- 3.2 MPa . It was concluded that the new material , Ormocer , which is an organically modified ceramic restorative material can potentially have orthodontic applications if available in a more flowable paste . These new material s are more biocompatible and have lower wear rate including bonding orthodontic brackets to teeth
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 .