title: Long-term survival of fragment bonding in the treatment of fractured crowns: a multicenter clinical study.
abstract: In three Scandinavian dental facilities, a series of 334 permanent incisors with fractures of the crown or crown and root was treated by reattachment of the fragment with a resin composite. Two centers (Oslo and Stockholm) employed acid etching of enamel alone for fragment bonding (n = 146), while the third center (Copenhagen) used a combination of enamel etching and dentinal bonding (n = 188). Although the final retention rate of fragment bonding was similar in the two groups, it took the dentinal bonding group almost three times as long to drop to 50% fragment retention. This difference could be attributed to greater bonding strength in the dentinal bonding group, greater risk of second injury in the younger acid-etching group, or difficulty in maintaining a dry operative field in the younger age group. The good fragment retention, acceptable esthetics, and pulpal vitality observed in the present series indicate that reattachment of the coronal fragment is a realistic alternative to placement of conventional resin-composite restorations.
authors.affiliation: Department of Pedodontics, Göteborg University, Sweden.
authors.forename: F M
authors.initials: FM
authors.lastname: Andreasen
authors.forename: J G
authors.initials: JG
authors.lastname: Norén
authors.forename: J O
authors.initials: JO
authors.lastname: Andreasen
authors.forename: S
authors.initials: S
authors.lastname: Engelhardtsen
authors.forename: U
authors.initials: U
authors.lastname: Lindh-Strömberg
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D002648:Child; D003188:Composite Resins; D003790:Dental Pulp Necrosis / Q000209:etiology; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005260:Female; D005500:Follow-Up Studies; D005976:Glutaral; D006801:Humans; D008297:Male; D011109:Polymethacrylic Acids; D013997:Time Factors; D014084:Tooth Avulsion / Q000150:complications; D019228:Tooth Crown / Q000293:injuries*; D014082:Tooth Fractures / Q000150:complications / Q000628:therapy*; D014092:Tooth Root / Q000254:growth & development / Q000293:injuries; D016896:Treatment Outcome
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C044372:Gluma; D005976:Glutaral