A Corner Has Chipped off a Ceramic Veneer: Can It Be Repaired, or Must It Be Replaced?｜證據鏈

When a corner chips off a ceramic veneer, the entire veneer does not necessarily need to be removed, but resin should not be added simply because the defect is small. Whether repair is reasonable depends on whether the damage is in an aesthetic area or at a main occlusal contact, whether the crack is still extending, whether the remaining veneer is stable, whether the bondable substrate is ceramic, enamel, dentine, or old resin, and whether the occlusal factor that caused the damage can be adjusted. Pooled clinical data show that veneer events need to be separated into chipping or fracture, debonding, marginal discolouration, and other problems; they cannot all be grouped under the single term “failure”. Bonding studies of repairs also indicate that glass ceramics, oxide ceramics, and hybrid ceramics require different surface treatments. Much of the current evidence still comes from in vitro testing, so bond strength cannot be converted directly into a duration of intraoral service.