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Table 1 Definitions of the measurements used in this study

From: Efficacy of Miniscrew-Assisted Rapid Palatal Expansion (MARPE) in late adolescents and adults with the Dutch Maxillary Expansion Device: a prospective clinical cohort study

Measurement Section for measurements Definition
Intermolar width (IMW) 3D reconstructed image from intra-oral dental scan Transverse distance between the L & R maxillary M1 mesiocentral fossae
Interpremolar width (IPW) 3D reconstructed image from intra-oral dental scan Transverse distance between the L & R maxillary P1 mesial fossae
Intercanine width (ICW) 3D reconstructed image from intra-oral dental scan Transverse distance between the L & R maxillary canine (C) buccal cusp tips
Midpalatal suture width at M1 or P1 (MSW) Coronal cross-sectional slice passing through the M1 buccal groove or the P1 buccal cusp tip Transverse distance between the medial limits of the L & R palatine process at the palatal floor
Palatal alveolar width at M1 or P1 (PAW) Coronal cross-sectional slice passing through the M1 buccal groove or the P1 buccal cusp tip Transverse distance between the L & R most cervical medial limits of the palatal alveolar process
Nasal cavity width (NCW) Coronal cross-sectional slice passing through the M1 buccal groove Transverse distance between the L & R most lateral point of the nasal cavity
Tooth inclination at M1 or at P1 (TI) Coronal cross-sectional slice passing through the M1 buccal groove or the P1 buccal cusp tip 2D inner angle between the palatal plane and the L & R line running through the palatal apex and the mesiobuccal fossa (M1) or the mesial fossa (P1)
Clinical crown height at M1 or P1 (CCH) 3D reconstructed image from Intra-oral dental scan Vertical distance between the L & R most apical point of the gingival margin and the most caudal point on the buccal groove (M1) or buccal cusp tip (P1)
Buccal bone thickness at M1 or P1 (BBT) Coronal cross-sectional slice passing through the most buccal point of the M1 mesiobuccal root or the P1 buccal cusp tip Transverse distance between the L & R buccal cortex of the alveolar process and the mesiobuccal root (M1) or buccal root (P1)