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Table 5 Mean difference (in mm) between the time points

From: A two-year comparative assessment of retention of arch width increases between modified vacuum-formed and Hawley retainers: a multi-center randomized clinical trial

Variable

HR

mVFR

ICW

  

T1–T0

 − 0.01

 − 0.11

T2–T1

 − 0.12

 − 0.13

T3–T2

 − 0.27

 − 0.25

T4–T3

0.10

0.10

T4–T0

 − 0.30

 − 0.39

IPMW

  

T1–T0

 − 0.01

 − 0.23

T2–T1

 − 0.12

 − 0.10

T3–T2

 − 0.27

 − 0.37

T4–T3

0.10

 − 0.09

T4–T0

 − 0.30

 − 0.79

IFMW1

  

T1–T0

 − 0.01

 − 0.20

T2–T1

 − 0.12

 − 0.14

T3–T2

 − 0.27

 − 0.08

T4–T3

0.10

 − 0.07

T4–T0

 − 0.30

 − 0.49

IFMW2

  

T1–T0

 − 0.01

 − 0.06

T2–T1

 − 0.12

 − 0.09

T3–T2

 − 0.27

 − 0.15

T4–T3

0.10

0.09

T4–T0

 − 0.30

 − 0.21

  1. HR indicates Hawley retainer; mVFR, modified vacuum-formed retainer; ICW, intercanine width; IPMW, interpremolar width; IFMW1, interfirst molar mesiobuccal cusp width-; IFMW2, interfirst molar distobuccal cusp width; T0, at debond; T1, 3-month retention; T2, 6-month retention; T3, 12-month retention; T4, 24-month retention