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Table 1 Excluded articles with reasons

From: Esthetic, mechanical, and biological outcomes of various implant abutments for single-tooth replacement in the anterior region: a systematic review of the literature

Excluded articles Reason of exclusion
Zembic et al. 2009 [32], Sailer et al. 2009 [33], Zembic et al. 2013 [34], Bosch et al. 2018 [35] Included molar teeth
Van Brakel et al. 2012 [36], den Hartog et al. 201 3[37], Rieder et al. 2016 [38] Irrelevant outcomes
Furze et al. 2012 [39], Montero et al. 2012 [40], Schwarz et al. 2012 [41], Hosseini et al. 2013 [42], Fenner et al. 2016 [43], Kim et al. 2016 [44], Peng et al. 2017 [45], Asgeirsson et al. 2019 [46] Study type (not RCTs)