Fracture strength of intact and fragment-bonded teeth at various velocities of the applied force

Bonding of a tooth fragment to the remaining tooth substance can restore cr own fracture of an anterior tooth. in this study, sheer central incisors we re used. The crowns were fractured transversely and the crown fragment was bended to the remaining tooth structure. This technique involves acid etchi ng, use of an experimental adhesive (Gluma+) and a BisGMA/TEGDMA resin. The mean fracture strength of the restored teeth was not significantly differe nt from that of intact teeth when tested at a rather low crosshead speed (0 .5 mm/min) but different and about 30% lower when tested at a higher crossh ead speed (500 mm/min). In studies aiming to test resistance to forces whic h might cause trauma, it might be appropriate to use a high crosshead speed .