Chipping of veneering ceramic on a lithium disilicate anterior single crown: Description of repair method and a fractographic failure analysis

Abstract

Objective This article presents a retrospective analysis of an anterior single crown that showed chipping of the veneering ceramic, the clinical stages of intraoral repair made in composite resin, and fractographic analysis of the causes of failure. Clinical considerations The ceramic chipping occurred in the incisal and labial surfaces of the crown, 1 year after installation. Clinical examination revealed the presence of occlusal interference, which was probably responsible for chipping. Vinyl‐polysiloxane impression was made from the patient, and epoxy replica was produced. The replica was gold coated and inspected under the optical microscopy and scanning electron microscope (SEM) for descriptive fractography. Optical microscopy and SEM images showed that chipping initiated at the incisal edge, where it is possible to note an area of damage accumulation. At the labial surface, multiple arrest lines with their convex sides facing the incisal edge were observed. The fractured area was repaired intraorally with composite resin, and the patient's occlusion was checked and monitored. Conclusion According to the fractographic analysis, occlusal interference was related to ceramic chipping in the incisal edge. Intraoral repair technique with composite resin was indicated for this moderate chipping. Clinical significance Retrieval analysis of chipping ceramic delivers better understanding of the failure origin and could prevent future failures. Intraoral repair is a practical and conservative technique and may be performed in a single clinical session without requiring the removal of prosthesis.

Assessment of two repairing techniques for a novel lithium disilicate based ceramic

“…Other surface treatments are used air abrasion with alumina particles with or without silica layer for promoting repair of fractured part of ceramic with composite [14]. Increasing the surface area increases the bonded surface area and the bond strength [15].…”

Effect of Clinical Sandblasting on the Surface Roughness of Zirconia Cores for all Ceramic Crowns and their Fracture Resistance after the Addition of Repair.

“…18 Depending on the composition and microstructure of the material, a variety of intraoral healing techniques for ceramic restorations have been studied and documented . [19][20][21] In the present study, following the manufacturer's recommendations, the preparation parameters were chosen to give adequate thickness for both zirconia cores and veneering material. Since the modulus of elasticity of PMMA is comparable to that of human dentin, 22,23 , this material was selected for the manufacturing of definitive dies.…”

Repair bond strength of dental computer‐aided design/computer‐aided manufactured ceramics after different surface treatments

“…If intraoral repair is favored, HF must be used with extreme care to ensure that it does not leak into the oral cavity or touch any tissues. Rubber dam isolation is mandatory to exclude saliva contamination and soft tissue contact 46,47 …”