Findings

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Evidence found and GRADE certainty

4,410 questions · 8,901 findings · 1,091 reviews

No studies found 1,687 · 19%GRADE not reported 1,469 · 16.5%Very low 1,969 · 22.1%Low 2,060 · 23.1%Moderate 1,302 · 14.6%High 414 · 4.7%

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Superelastic NiTi arch wire vs Thermoelastic NiTi arch wire

Root resorption · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)

It is very uncertain whether superelastic NiTi arch wire changes root resorption (reduction in root length) compared with thermoelastic NiTi arch wire (very low certainty).

1 finding from 1 review

Higher mean patient age (per 1 year) vs Lower mean patient age (per 1-year decrement)

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, mean patient age was not significantly associated with space closure odds (OR 0.59 per year; not GRADE-rated).

1 finding from 1 review

Superelastic NiTi arch wire vs Thermoelastic NiTi arch wire

Time to next/working arch wire · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)

Superelastic NiTi arch wire showed no clear difference in time to next/working arch wire compared with thermoelastic NiTi arch wire; GRADE not reported.

1 finding from 1 review

NiTi arch wire of one cross-sectional size vs NiTi arch wire of a different cross-sectional size

Pain · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)
1 finding from 1 review
  • Different sizes of NiTi wires (Alhaija 2021; Erdinc 2004); not pooled due to clinical heterogeneity; little or no difference at day 1. Erdinc 0.014 vs 0.016 inch higher pain at day 4 MD 5.00 (0.19 to 9.81) and day 6 MD…
    2 studies · 149 participants
    Low

Thermoelastic copper NiTi (CuNiTi) arch wire vs Conventional (stabilised) NiTi arch wire

Alignment rate · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)

It is very uncertain whether thermoelastic copper NiTi (CuNiTi) arch wire changes alignment rate compared with conventional NiTi arch wire (very low certainty).

1 finding from 1 review

Superelastic NiTi arch wire vs Conventional (stabilised) NiTi arch wire

Pain day 1 · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)

Superelastic NiTi arch wire showed no clear difference in pain day 1 compared with conventional (stabilised) NiTi arch wire (low certainty).

1 finding from 1 review

High intake of sweets vs Lower/less intake of sweets

Dental caries · Primary school children in Ethiopia

A high intake of sweets was associated with higher odds of dental caries (OR 2.71, 95% CI 1.968-3.451; ungraded).

1 finding from 1 review

Higher BMI (continuous / per-unit increment) vs Lower BMI (continuous reference / per 1 kg/m2 decrement)

Dental caries in children · Children (approx. 4-18 years)

Pooling studies that used BMI as a continuous variable showed no significant association between per-unit BMI and childhood dental caries (OR 1.01, 95% CI 0.99 to 1.03; I2=3.5%); ungraded.

3 findings from 1 review

Superelastic NiTi arch wire vs Conventional (stabilised) NiTi arch wire

Time to next/working arch wire · People receiving orthodontic treatment with fixed appliances (upper and/or lower full arch)

Superelastic NiTi arch wire showed no clear difference in time to next/working arch wire compared with conventional (stabilised) NiTi arch wire; GRADE not reported.

1 finding from 1 review