TY - JOUR T1 - In-vitro performance of CAD/CAM-fabricated implant-supported temporary crowns. AU - Rosentritt,Martin, AU - Raab,Philipp, AU - Hahnel,Sebastian, AU - Stöckle,Matthias, AU - Preis,Verena, Y1 - 2017/01/21/ PY - 2016/09/14/received PY - 2017/01/10/accepted PY - 2017/1/23/pubmed PY - 2018/9/1/medline PY - 2017/1/23/entrez KW - Abutment KW - CAD/CAM composites KW - Fracture resistance KW - Implant crown KW - PMMA, temporary KW - Provisional, chewing simulation SP - 2581 EP - 2587 JF - Clinical oral investigations JO - Clin Oral Investig VL - 21 IS - 8 N2 - OBJECTIVES: The aim of this study was to investigate the in-vitro performance and fracture resistance of a temporary computer-aided designed and computer-aided manufactured polymethylmethacrylate (CAD/CAM-PMMA) material as implant or tooth-supported single crown with respect to the clinical procedure (permanently bonded/temporarily cemented). MATERIALS AND METHODS: Sixty-four crowns were fabricated on implants or human molar teeth simulating (a) labside procedure on prefabricated titanium-bonding base ([TiBase] implant crown bonded in laboratory, screwed chairside), (b) labside procedure ([LAB] standard abutment and implant crown bonded in laboratory, screwed chairside), (c) chairside procedure ([CHAIR] implant crown bonded to abutment), and (d) reference ([TOOTH] crowns luted on prepared human teeth). Crowns were made of a CAD/CAM-PMMA temporary material (TelioCAD, Ivoclar-Vivadent). For investigating the influence of fixation, half of the crowns were permanently (P) or temporarily (T) bonded. Combined thermal cycling and mechanical loading (TCML) was performed simulating a 5-year clinical situation. Fracture force was determined. Data were statistically analyzed (Kolmogorov-Smirnov test, one-way ANOVA; post hoc Bonferroni, α = 0.05). RESULTS: All restorations survived TCML without visible failures. Fracture results varied between 3034.3 (Tooth-P) and 1602.9 N (Tooth-T) [TOOTH], 1510.5 (TiBase-P) and 963.6 N (TiBase-T) [TiBase], 2691.1 (LAB-P) and 2064.5 N (LAB-T) [LAB], and 1609.4 (Chair-P) and 1253.0 N (Chair-T) [CHAIR]. Tested groups showed significantly (p < 0.001) different fracture values. Failure pattern was characterized by fractures in mesial-distal, buccal-oral, or mixed (mesial-distal/buccal-oral) directions, with differences for the individual groups. CONCLUSIONS: Temporary CAD/CAM crowns showed no different in-vitro performance but provided different fracture results that depended on cementation, screw channel, and type of abutment. CLINICAL RELEVANCE: All bonded and screwed PMMA crowns were in a range where clinical application seems not restricted. SN - 1436-3771 UR - https://www.unboundmedicine.com/medline/citation/28110407/In_vitro_performance_of_CAD/CAM_fabricated_implant_supported_temporary_crowns_ DB - PRIME DP - Unbound Medicine ER -