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Manufacturing Accuracy, Intaglio Surface Adaptation, and Survival of Additively and Subtractively Manufactured Definitive Resin Crowns After Cyclic Loading: An In Vitro Study

2024; Quintessence Publishing Company; Volume: 37; Issue: 7 Linguagem: Inglês

10.11607/ijp.8976

1942-4426

Pedro Molinero‐Mourelle, Alvaro Limones, Mehmet Esad Güven, Manrique Fonseca, Anne Peutzfeldt, Burak Yılmaz, Gülce Çakmak,

Dental materials and restorations

Purpose: To assess the manufacturing accuracy, intaglio surface adaptation, and survival of resin-based CAD/CAM definitive crowns created via additive manufacturing (AM) or subtractive manufacturing (SM).Materials and Methods: A maxillary right first molar crown was digitally designed and manufactured using AM hybrid resin composite (VarseoSmile Crown Plus, Bego [AM-HRC]), AM glass filler-reinforced resin composite (Crowntec, Saremco Dental [AM-RC]), and SM polymer-infiltrated ceramic (Vita Enamic, VITA Zahnfabrik [SM-PICN]).Manufacturing accuracy (trueness and precision) was assessed by computing the root mean square (RMS) error (in μm; n = 15 per material).Intaglio surface adaptation was assessed by calculating the average gap distance (μm).Ten crowns from each group were cemented on fiberglass-reinforced epoxy resin dies and cyclically loaded to simulate 5 years of functional loading.One-way ANOVA, post hoc Bonferroni comparison tests, and Levene's test were used to analyze the data (α = .05).Results: AM-RC had higher overall trueness than AM-HRC and SM-PICN (P ≤ .05),whereas the trueness of AM-RC on the external surface was similar to that of SM-PICN (P = .99)and higher than AM-HRC (P = .001).SM-PICN had lower precision than AM-RC and AM-HRC overall and at internal occlusal surfaces (P ≤ .05).Overall intaglio surface adaptation was similar between all groups (P = .531).However, for the axial intaglio surface, AM-RC and AM-HRC had higher adaptation than SM-PICN (P ≤ .05).All tested crowns survived the cyclic loading simulation of 5 years clinical use.Conclusions: AM-RC showed high manufacturing accuracy and adaptation.The tested resin-based CAD/CAM materials demonstrated clinically acceptable manufacturing accuracy and simulated medium-term durability, justifying the initiation of clinical investigations to determine their potential implementation in daily clinical practice.