Primary study · included by 4 reviews

The impact of non-extraction orthodontic treatment on oral health-related quality of life: clear aligners versus fixed appliances-a randomized controlled trial.

Alfawal 2022 · Alfawal Alaa M H, Burhan Ahmad S, Mahmoud Ghiath, et al. · European journal of orthodontics · 2022

Included by

Outcome this study informsPooled effectEvidenceCertainty
Pain (VAS)
Clear aligners vs Within-group change, 7 days versus 24 hours after appliance fit · 24 hours to 7 days
SMD -10.02 [-11.13, -8.91]2 studies · 88 participantsGRADE not reported
Evaluation of psychological effects of orthodontic treatment vs. orthognathic surgery: a systematic review and meta-analysis.
Non-Cochrane · intervention · 2026 · cited as Alfawal 2022 · Tables 1 and 2; Results, Meta-Analysis; References
Outcome this study informsPooled effectEvidenceCertainty
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.69 [7.23, 12.16]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.94 [7.08, 12.80]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 10.23 [7.67, 12.80]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 10.27 [8.10, 12.44]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.66 [7.30, 12.02]14 studies · 435 participantsGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.76 [7.22, 12.30]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.29 [6.89, 11.69]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 10.04 [7.45, 12.64]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.40 [7.05, 11.75]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.67 [7.20, 12.14]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.46 [7.05, 11.87]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.80 [7.35, 12.24]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 8.93 [6.70, 11.17]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.45 [7.02, 11.89]13 studiesGRADE not reported
OHIP-14 score (higher is worse OHRQoL)
Orthodontic treatment (fixed appliances or clear aligners) and Orthognathic surgery (traditional or surgery-first) vs None (single-arm pooled post-treatment mean) · Last available assessment after treatment (time points not consistent)
Pooled mean score 9.27 [6.88, 11.66]13 studiesGRADE not reported
Outcome this study informsPooled effectEvidenceCertainty
Oral health-related quality of life (OHIP-14; higher score = worse)
Conventional fixed orthodontic appliance treatment vs OHRQoL at week 1 versus month 1 after appliance placement · Week 1 versus month 1
MD 9.5 [7.5, 11.5]2 studies · 40 participantsLow
Outcome this study informsPooled effectEvidenceCertainty
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 10 days
SMD -0.895 [-1.426, -0.364]1 studyGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · All follow-up durations (1 week to end of treatment)
SMD -0.850 [-0.973, -0.727]16 studies · 856 participantsModerate
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 3 months
SMD -0.590 [-1.194, 0.013]1 studyGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 2 weeks
SMD -0.734 [-1.172, -0.397]2 studiesGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · End of treatment
SMD -0.970 [-1.412, -0.528]2 studiesGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 20 days
SMD -0.895 [-1.426, -0.364]1 studyGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 1 week
SMD -0.985 [-1.272, -0.699]3 studiesGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 6 months
SMD -0.850 [-1.144, -0.557]4 studiesGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 1 month
SMD -0.829 [-1.081, -0.577]4 studiesGRADE not reported
Quality of life
Clear aligners (Invisalign and similar removable aligners) vs Fixed orthodontic appliances (metal, self-ligating, ceramic, lingual brackets) · 12 months
SMD -0.531 [-1.178, 0.116]1 studyGRADE not reported

4 including reviews in total.