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Table 1 Characteristics of included studies

From: What effect does functional appliance treatment have on the temporomandibular joint? A systematic review with meta-analysis

Study

Design; setting; country$

Patients (M/F); age*

Intervention; duration#

Follow-up

Imaging method

Outcome

Arat et al. [38]

uNRS; Uni; TUR

CI. II/1; ANB ≥ 4°; SN-ML 25-32°

EG, 9 (2/7); 11.2

CG, 9 (4/5); 9.7

Activator; 16.0

Pre-Tx

6.0 mos post-Tx (24.0 mos)

MRI

Condyle-to-disc angle (ant/mid/post)

Joint space (anterior/posterior/medial)

Arici et al. [39]

RCT; Uni; TUR

CI. II/1; OJ > 5 mm; Mnd RTG

EG, 30 (13/17); NR

CG, 30 (9/21); NR

FNFS; 7.0

Pre-Tx

Post-Tx (7.0 mos)

CT

COND volume

GF volume

Joint space volume (anterior/posterior)

Cevidanes et al. [40, 41]

RCT; Uni; USA

CI. II/1 ≥ ¾ unit; OJ > 4.5-10.0 mm

EG, 28 (NR); 10.3

CG, 25 (NR); 10.9

Fränkel-2; 18.0

Pre-Tx

Post-Tx (18.0 mos)

MRI

PCA of skeletal morphology

Chavan et al. [42]

uNRS; Uni; IND

CI. II/1

EG1, 10 (6/4); 12.5

EG2, 10 (4/6); 11.5

CG, 10 (3/7); 12.0

EG1: Twin Block

EG2: Bionator

Pre-Tx

6.0 mos in Tx

MRI

SAG disc concentricity

SAG disc position

Chintakanon and Chintakanon et al. [43, 44]

pNRS; pract; THA

CI. II/1; OJ > 5 mm; Mnd RTG

EG, 19 (14/5); 11.7

CG, 21 (13/8); 11.5

Twin Block; 6.0

Pre-Tx

6.0 mos in Tx

MRI

Condylar axial angle

Coronal disc position

Eminence angle

SAG disc concentricity

SAG disc position

Croft et al. [45]

rNRS; pract; USA

ANB ≥4°; Cl. II ≥ ½ unit

EG, 40 (16/24); 8.5

CG†, 40; NR (matched)

RME/Herbst/EGA; 11.0

Pre-Tx

Post-Tx (11.0 mos)

2.7 years post-Tx

CT

Condylar growth

GF displacement

Joint space (anterior/posterior/superior)

Elfeky et al. [46]

uNRS; Uni; EGY

Cl. II ≥ ½ unit; Mnd RTG; V-pattern

EG, 22 (0/22); NR

CG†, 18 (0/18); NR

Twin Block; 9.4

Pre-Tx

Post-Tx (9.4 mos)

CBCT

COND position

COND size

GF position

Joint space (anterior/posterior/superior/medial)

Franco et al. and Franco [47, 48]

RCT; Uni; BRA

CI. II/1

EG, 28 (15/13); 10.3

CG, 28 (14/14); 10.9

Fränkel-2; 18.0

Pre-Tx

Post-Tx (18.0 mos)

MRI

Disc position

Disc shape

  1. CG control group, COND condyle, EG experimental group, EGA eruption guidance appliance, FA functional appliance (unspecified), FNFS Forsus nitinol flat-spring, GF glenoid fossa, M male, RCT randomized clinical trial, Mnd RTG mandibular retrognathism, NR not reported, PCA principal component analysis, pNRS prospective non-randomized study, Pract practice, rNRS retrospective non-randomized study, SAG sagittal, Uni university, V vertical, mos months
  2. #Duration of active Class II treatment in months
  3. $Countries are given with their ISO-3 code
  4. *Age is given in years either as mean
  5. †Historical