pISSN 2234-7518
eISSN 2005-372X

Table. 2.

Study characteristics

Author N Study design Setting Race Compare Appliance Appliance design Diameter
length
Mean age (SD) Activation Activation
period
Success rate
Calil et al.13
(2021)
16 Retrospective cohort University Dentistry
Institute
Brazil Self ligate vs. MARPE PecLab appliance (Belo Horizonte, Brazil) Molar without extension 4 titanium mini-implants of 1.8 mm diameter and 8 mm length 24.92
(7.6)
2/4-turn a day Until the palatal cusps of maxillary first molars touch the buccal cusps of the mandibular first molars ND
Cantarella
et al.16
(2017)
15 Retrospective University USA No BioMaterials Korea (Hanam, Korea) Molar without extension ND 17.2
(4.2)
2 turns per day, then 1 activation per day Until interincisal diastema appear, then complete when maxillary width was equal to mandibular width 100%*
Clement
et al.20
(2017)
10 Prospective University India No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.8 mm diameter and 11 mm length 21.5
(ND)
2 turns per day Until the required expansion was achieved 100%*
Elkenawy
et al.25
(2020)
31 Retrospective University USA No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.5 mm diameter and 11 mm length 20.4
(3.2)
2 turns per day, then 1 activation per day Until interincisal diastema appear, then complete when maxillary width was equal to mandibular width ND
Jesus
et al.22
(2021)
12 Retrospective cohort ND Brazil SARPE with/without cinch PecLab appliance Molar without extension 4 titanium mini-implants, ND Range
15–39
2 turns a day For 14 to 18 days, until full correction ND
Li et al.26
(2020)
22 Retrospective University China No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.5 mm diameter and 11 mm length 22.6
(4.5)
2 turns every other day Maxillary skeletal width was no longer less than mandible (mean 38 days) 100%*
Li et al.11
(2020)
48 Retrospective University China No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.5 mm diameter and 11 mm length 19.4
(3.3)
One-sixth of turn (0.13 mm) each day Maxillary skeletal width was no longer less than mandible ND
Lim et al.15
(2017)
24 Retrospective Hospital Korea No Hyrax II (Dentaurum, Ispringen, Germany) Molar with anterior arm extension 4 titanium mini-implants diameter, 1.8 mm; length, 7 mm; Orlus 21.6
(3.1)
Once a day (0.2 mm) Until the required expansion was achieved (5 week) 86.84%
Moon
et al.27
(2020)
24 Retrospective University Korea C-expander BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.5 mm diameter and 11 mm length 19.2
(5.9)
Once a day (0.2 mm) Until the required expansion was achieved (5 week) ND
Ngan
et al.18
(2018)
8 Retrospective University USA No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.8 mm diameterand 11 mm length 21.9
(1.5)
Varied with the severity of transverse discrepancy Until the occlusal aspect of lingual cusp of the maxillary first molars contacted occlusal aspect of the buccal cusp of the mandibular first molars. The 2–3 mm of overexpansion 100%*
Nguyen
et al.28
(2021)
20 Retrospective University Korea No BioMaterials KoreaMSE type II Molar without extension 4 titanium mini-implants of 1.8 mm diameterand 11 mm length 22.4
(17.6–27.1)
2 turns per day (0.13 mm/turn) Until diastema appeared, after which the rate was reduced to one turn per day, stop when required amount was achieved 20% overexpansion 100%*
de
Oliveira
et al.24
(2021)
17/15 Retrospectivecohort University Brazil MARPE vs. SARPE PecLab appliance9 mm expander Molar without extension 4 miniscrew unknown diameter and length MARPE 26 (11)
SARPE 28.5
(10.5)
2/4 immediately after mini implant placement and 2/4 turns daily (14–18 days) Until full correction 86.96%
Park
et al.29
(2017)
14 Retrospective University Korea No Hyrax II(Dentaurum, Ispringen, Germany) Molar with anterior arm extension Diameter, 1.8 mm; length, 7 mm; Orlus 20.1
(2.4)
Once a day (0.2 mm) Until the required expansion was achieved 84.21%
Tang
et al.7
(2021)
31 Retrospective University China No BioMaterials Korea Molar without extension 4 titanium mini-implants of 1.5 mm diameterand 11 mm length 22.14
(4.76)
Once a day (0.13 mm) Ranging from 40 to 60 turns 92%
Korean J Orthod 2022;52:182~200 https://doi.org/10.4041/kjod21.256
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