Gap finder
Search review questions
Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Every word you type has to appear somewhere in the question, and the closest matches are ranked first.
10,375 questions in 429 reviews · Oral Health
current versionsNo studies 1,344 · 13%Ungraded 6,832 · 65.9%Very low 1,228 · 11.8%Low 613 · 5.9%Moderate 290 · 2.8%High 68 · 0.7%
Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.
| Question | Effect | Evidence | Status / GRADE |
|---|---|---|---|
Extraction of the primary (baby) canine (single primary tooth extraction) vs No extraction (non-intervention control) Patient-reported outcomes (pain, discomfort and analgesic use) · Young people aged 9 to 14 years diagnosed with one or both palatally displaced permanent maxillary canines (PDC) · Evening after extraction and one week later Interventions for promoting the eruption of palatally displaced permanent canine teeth, without the need for… (2021) · Cochrane | Self-reported VAS pain (Naoumova 2012): pain and discomfort from extraction of the primary canine were low both during and after the procedure and mostly absent at one week; 35% of boys and 50% of girls took one dose… | 1 study · 44 participants | Ungraded |
Nd:YAG laser (neodymium-doped:yttrium-aluminum-garnet) vs Placebo (placebo laser or placebo agent) or no treatment Changes in intensity of pain (VAS 0 to 10) tested through tactile stimuli · Patients aged above 12 years with self-reported tooth hypersensitivity confirmed on clinical evaluation · Medium term (24 hours to 2 months) Laser therapy for dentinal hypersensitivity (2021) · Cochrane | MD -1.06 [-2.15, 0.03] | 2 studies | Ungraded |
Inflammatory bowel disease (IBD; Crohn's disease or ulcerative colitis) vs Healthy controls without IBD Periodontal disease (periodontitis) coincidence · Patients with inflammatory bowel disease (IBD) and controls without IBD; mostly adults (one pediatric study), both sexes · Hospital/clinic-based case-control and cross-sectional studies in 11 countries; 15 studies total (1748 participants: 1104 Crohn's disease, 534 ulcerative colitis, 110 IBD-form unspecified); 6 studies pooled for this analysis Oral Health Status in Patients with Inflammatory Bowel Diseases: A Systematic Review. (2021) | OR 2.49 [1.97, 3.15] | 6 studies | Ungraded |
Digital bitewing radiography, sensor-based (CCD/CMOS) vs Direct visual examination after tooth separation or bioptical cavity preparation Diagnostic accuracy for proximal caries detection (caries detection level) · Patients with permanent posterior teeth, proximal surfaces assessed clinically (in vivo) · In vivo (clinical); permanent posterior teeth, proximal surfaces, Caries detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | Sensitivity 0.55 [0.42, 0.67] | 1 study | Ungraded |
Fixed expander with differential opening expansion (DOE) vs Fixed fan-type expander Crossbite correction · Children and adults with a posterior crossbite, without a Class III skeletal relationship, cleft lip or palate (or… Orthodontic treatment for posterior crossbites (2021) · Cochrane | Massaro 2020: differential opening 24/24 vs fan-type 18/24 crossbites corrected | 1 study | Ungraded |
Intervention NR Dental caries prevalence · General population in Ethiopia (all ages, age range 6-100 years) · Community-, school-, and hospital/clinic-based populations across regions of Ethiopia, Tigray Dental caries and associated factors in Ethiopia: systematic review and meta-analysis. (2021) | Prevalence 0.4659 [0.2464, 0.6854] | 2 studies | Ungraded |
Laser fluorescence pen (DIAGNOdent 2190/Pen) vs Histological validation (serial sectioning, grinding, hemisection, or microradiography) Diagnostic accuracy for occlusal caries detection at the dentin caries detection level (D0-2 versus D3-4) · Extracted human permanent posterior teeth (premolars and molars), occlusal (pit-and-fissure) surfaces · in vitro Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | DOR 5.85 [1.77, 19.30] | 4 studies | Ungraded |
ARP with allograft vs ARP with xenograft Implant failure rate · Adults aged 18 years or older, in good general health (including well-controlled systemic disease), requiring… · 6 months Interventions for replacing missing teeth: alveolar ridge preservation techniques for dental implant site… (2021) · Cochrane | Outcome not reported | 0 studies | No studies |
Conventional bitewing radiography, E-speed film vs Histological validation of dental tissues (gold standard) Diagnostic accuracy for proximal caries detection (caries detection level) · Extracted permanent posterior teeth with proximal surfaces (in vitro) · In vitro (laboratory; extracted teeth); permanent posterior teeth, proximal surfaces, Caries detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | DOR 6.80 [4.58, 10.10] | 9 studies | Ungraded |
Digital bitewing radiography (phosphor plates) vs Histological validation (serial sectioning, grinding, hemisection, or microradiography) Diagnostic accuracy for occlusal caries detection at the dentin caries detection level (D0-2 versus D3-4) · Extracted human permanent posterior teeth (premolars and molars), occlusal (pit-and-fissure) surfaces · in vitro Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | Sensitivity 0.48 [0.24, 0.73] | 2 studies | Ungraded |
Radiographic imaging methods (any: analogue radiographs, digital radiographs, or CBCT) vs Reference standard (histology, excavation, or enhanced visual examination) Specificity for detection and diagnosis of early (enamel) caries · Asymptomatic children, adolescents, or adults presenting for clinical examination (in vivo studies), or extracted… · Up to 3 months between index test and reference standard (in vivo studies), Primary dentition (non-CBCT) Imaging modalities to inform the detection and diagnosis of early caries (2021) · Cochrane | Specificity 0.87 [0.77, 0.93] | NR | Ungraded |
Cone beam computed tomography (CBCT) vs Reference standard (histology, excavation, or enhanced visual examination) Sensitivity for detection and diagnosis of early (enamel) caries · Asymptomatic children, adolescents, or adults presenting for clinical examination (in vivo studies), or extracted… · Up to 3 months between index test and reference standard (in vivo studies), Proximal surfaces (CBCT) Imaging modalities to inform the detection and diagnosis of early caries (2021) · Cochrane | Sensitivity 0.68 [0.42, 0.86] | NR | Ungraded |
Conventional bitewing radiography, E-speed film vs Histological validation of dental tissues (gold standard) Diagnostic accuracy for proximal caries detection (dentin detection level) · Extracted permanent posterior teeth with proximal surfaces (in vitro) · In vitro (laboratory; extracted teeth); permanent posterior teeth, proximal surfaces, Dentin detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | AUC 0.92 | 5 studies | Ungraded |
Observed population vs Not applicable Tooth brushing less than once daily, males in 2016 · Nationally surveyed adolescents in the United Arab Emirates · Overall Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | Prevalence 46.1 | 1 study · 24220 participants | Ungraded |
Fibre-optic transillumination (FOTI) vs Histological validation (serial sectioning, grinding, hemisection, or microradiography) Diagnostic accuracy for occlusal caries detection at the caries detection level (D0 versus D1-D4) · Extracted human permanent posterior teeth (premolars and molars), occlusal (pit-and-fissure) surfaces · in vitro Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | Sensitivity 0.97 [-0.92, 0.99] | 1 study | Ungraded |
ARP with alloplast plus barrier membrane vs ARP with alloplast without membrane Need for additional augmentation prior to implant placement · Adults aged 18 years or older, in good general health (including well-controlled systemic disease), requiring… · 9 months Interventions for replacing missing teeth: alveolar ridge preservation techniques for dental implant site… (2021) · Cochrane | Outcome not reported | 0 studies | No studies |
Laser fluorescence (DIAGNOdent 2190/pen) vs Histological validation of dental tissues (gold standard) Diagnostic accuracy for proximal caries detection (caries detection level) · Extracted permanent posterior teeth with proximal surfaces (in vitro) · In vitro (laboratory; extracted teeth); permanent posterior teeth, proximal surfaces, Caries detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | DOR 30.79 [8.74, 108.51] | 5 studies | Ungraded |
Laser fluorescence (DIAGNOdent 2190/pen) vs Histological validation of dental tissues (gold standard) Diagnostic accuracy for proximal caries detection (caries detection level) · Extracted permanent posterior teeth with proximal surfaces (in vitro) · In vitro (laboratory; extracted teeth); permanent posterior teeth, proximal surfaces, Caries detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | Sensitivity 0.79 [0.62, 0.90] | 5 studies | Ungraded |
Semi-rapid maxillary expansion vs Rapid maxillary expansion Molar expansion · Children and adults with a posterior crossbite, without a Class III skeletal relationship, cleft lip or palate (or… Orthodontic treatment for posterior crossbites (2021) · Cochrane | MD 0.60 [-0.55, 1.75] | 1 study · 35 participants | Ungraded |
Vital staining (e.g. toluidine blue, tolonium chloride) vs Surgical or punch biopsy with histological assessment Sensitivity · Adults (aged 16 years or over) presenting to primary or secondary care with clinically evident suspicious or innocuous… Diagnostic tests for oral cancer and potentially malignant disorders in patients presenting with clinically… (2021) · Cochrane | Sensitivity 0.86 [0.79, 0.90] | 20 studies | Low |
Visual examination (VE) vs Histological validation of dental tissues (gold standard) Diagnostic accuracy for proximal caries detection (caries detection level) · Extracted permanent posterior teeth with proximal surfaces (in vitro) · In vitro (laboratory; extracted teeth); permanent posterior teeth, proximal surfaces, Caries detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | Specificity 0.85 [0.74, 0.92] | 9 studies | Ungraded |
Maternal smoking during pregnancy vs No maternal smoking during pregnancy Dental caries · Children · Community/population-based (multiple countries), Children's age: 3 years or younger Asked by 2 reviewsCorrelation Between Maternal Smoking During Pregnancy and Dental Caries in Children: A Systematic Review and… (2021) | OR 1.71 [1.34, 2.16] | 3 studies | Ungraded |
Autism spectrum disorder vs Not applicable Poor oral hygiene prevalence · Autistic children and young adults in Dubai · Overall Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | Prevalence 59 | 1 study | Ungraded |
Systemic antibiotic prophylaxis (any regimen; topical therapy excluded) administered before and/or after tooth extraction vs Placebo Swelling (7th day) · People undergoing tooth extraction (21 of 23 trials: healthy patients undergoing impacted third molar extraction; 1… · 7th day Antibiotics to prevent complications following tooth extractions (2021) · Cochrane | RR 0.80 [0.50, 1.27] | 4 studies · 452 participants | Very low |
Conventional bitewing radiography (F-speed film) vs Histological validation (serial sectioning, grinding, hemisection, or microradiography) Diagnostic accuracy for occlusal caries detection at the dentin caries detection level (D0-2 versus D3-4) · Extracted human permanent posterior teeth (premolars and molars), occlusal (pit-and-fissure) surfaces · in vitro Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | DOR 23.60 [8.28, 67.24] | 2 studies | Ungraded |
Nd:YAG laser (neodymium-doped:yttrium-aluminum-garnet) vs Placebo (placebo laser or placebo agent) or no treatment Changes in intensity of pain (VAS 0 to 10) tested through air blast stimuli · Patients aged above 12 years with self-reported tooth hypersensitivity confirmed on clinical evaluation · Short term (0 to 24 hours) Laser therapy for dentinal hypersensitivity (2021) · Cochrane | MD 0.22 [-0.55, 0.99] | 2 studies | Ungraded |
Dental caries (ascertained mostly by WHO criteria/DMFT; also CAST, ICDAS, or clinical examination) vs None (descriptive prevalence meta-analysis) Dental caries prevalence · General Pakistani population (all ages and both sexes; predominantly children and adolescents) · Pakistan (school-, community-, and hospital/clinic-based cross-sectional surveys), Dentition: primary Prevalence of dental caries in Pakistan: a systematic review and meta-analysis. (2021) | Prevalence 50.493 [43.867, 57.110] | NR | Ungraded |
Double primary (canine and first molar) tooth extraction vs Single primary (canine) tooth extraction Reported improvement in the position of the ectopic canine measured from radiographs · Young people aged 9 to 14 years diagnosed with one or both palatally displaced permanent maxillary canines (PDC) Interventions for promoting the eruption of palatally displaced permanent canine teeth, without the need for… (2021) · Cochrane | no estimate extracted | 0 studies | No studies |
Autism spectrum disorder vs Healthy counterparts Dental-care visit prevalence · Children with autism spectrum disorder in Dubai · Overall Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | Prevalence 65 | 1 study | Ungraded |
Non-selective carious tissue removal and conventional restoration (CR) vs Hall Technique (sealing with a preformed metal crown) Efficiency, costs or cost-effectiveness · Children and/or adults with permanent or primary teeth, vital (sensitive) pulps, and cavitated or dentine carious… · Primary dentition Interventions for treating cavitated or dentine carious lesions (2021) · Cochrane | Cost-effectiveness reported narratively: HT found more cost-effective than CR in primary teeth (Innes 2011; Santamaria 2018); not GRADE-rated. | 2 studies | Ungraded |
Double primary (canine and first molar) tooth extraction vs Single primary (canine) tooth extraction Patient-reported outcome measures (PROMs), including quality of life and pain · Young people aged 9 to 14 years diagnosed with one or both palatally displaced permanent maxillary canines (PDC) Interventions for promoting the eruption of palatally displaced permanent canine teeth, without the need for… (2021) · Cochrane | no estimate extracted | 0 studies | No studies |
Systemic antibiotic prophylaxis (any regimen; topical therapy excluded) administered before and/or after tooth extraction vs Placebo Pain (continuous, VAS 0-10 cm, 7th day) · People undergoing tooth extraction (21 of 23 trials: healthy patients undergoing impacted third molar extraction; 1… · 6th to 7th day Antibiotics to prevent complications following tooth extractions (2021) · Cochrane | MD -0.26 [-0.59, 0.07] | 4 studies · 422 participants | Very low |
Cone beam computed tomography (CBCT) vs Digital radiographs (direct within-person / paired comparison); reference standard: histology Specificity for detection and diagnosis of early (enamel) caries · Asymptomatic children, adolescents, or adults presenting for clinical examination (in vivo studies), or extracted… · Up to 3 months between index test and reference standard (in vivo studies), Digital Imaging modalities to inform the detection and diagnosis of early caries (2021) · Cochrane | Specificity 0.76 [0.43, 0.93] | 6 studies | Ungraded |
Intervention NR Dental caries prevalence · General population in Ethiopia (all ages, age range 6-100 years) · Community-, school-, and hospital/clinic-based populations across regions of Ethiopia Dental caries and associated factors in Ethiopia: systematic review and meta-analysis. (2021) | Prevalence 0.4098 [0.3162, 0.5034] | 13 studies · 6950 participants | Ungraded |
Er:YAG laser (erbium-doped:yttrium-aluminum-garnet) vs Placebo (placebo laser or placebo agent) or no treatment Outcome NR · Patients aged above 12 years with self-reported tooth hypersensitivity confirmed on clinical evaluation Laser therapy for dentinal hypersensitivity (2021) · Cochrane | We did not find any eligible study to evaluate erbium:yttrium-aluminum-garnet (Er:YAG) or carbon dioxide (CO2) laser compared with placebo/no treatment. | 0 studies | No studies |
Intensive periodontal treatment (subgingival SRP with or without other periodontal treatment) vs Supra-gingival scaling Change in diastolic blood pressure (DBP, mmHg) · Adults (any age/sex) with chronic periodontitis (>=5 teeth remaining; PPD >4 mm), with or without hypertension · Long term (follow-up 6 months), People diagnosed with periodontitis Effect of periodontal treatments on blood pressure (2021) · Cochrane | MD -4.96 [-13.04, 3.13] | 2 studies · 227 participants | Very low |
Electrical conductance devices (electronic caries monitor (ECM) and/or CarieScan Pro), used as an adjunct to clinical oral examination vs Reference standard: histology or enhanced visual examination (with or without radiographs) Outcome NR · Teeth with previously applied restorations (secondary caries) or pit and fissure sealants; target condition =… · Up to 3 months between index test and reference standard (in vivo studies) Electrical conductance for the detection of dental caries (2021) · Cochrane | No eligible studies. 'No included studies reported inclusion criteria of previously applied restorations or pit and fissure sealants' (a planned subgroup). | 0 studies | No studies |
Schwarz appliance vs No active treatment (control) Upper incisors to maxilla (inclination, degrees) at 9 months · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth · 9 months Orthodontic treatment for crowded teeth in children (2021) · Cochrane | MD 0.33 [-2.26, 2.92] | 1 study · 28 participants | Ungraded |
Clear aligners (Invisalign / thermoformed aligners) vs Fixed appliances Simplified gingival index (s-GI) · Adolescents/teenagers undergoing orthodontic treatment · 1 month, Adolescents Impact of Aligners and Fixed Appliances on Oral Health during Orthodontic Treatment: A Systematic Review and… (2021) | MD -8.46 [-10.47, -6.45] | 1 study | Ungraded |
Intensive periodontal treatment (subgingival SRP with or without other periodontal treatment) vs Supra-gingival scaling Clinical attachment level (CAL) · Adults (any age/sex) with chronic periodontitis (>=5 teeth remaining; PPD >4 mm), with or without hypertension · Long term, People diagnosed with periodontitis Effect of periodontal treatments on blood pressure (2021) · Cochrane | MD -9.38 [-15.85, -2.91] | 1 study | Ungraded |
ARP with alloplast vs Extraction alone Changes in bucco-lingual/palatal width of alveolar ridge (mm) · Adults aged 18 years or older, in good general health (including well-controlled systemic disease), requiring… · 6 months Interventions for replacing missing teeth: alveolar ridge preservation techniques for dental implant site… (2021) · Cochrane | Outcome not reported | 0 studies | No studies |
Visual examination (VE) vs Direct visual examination after tooth separation or bioptical cavity preparation Diagnostic accuracy for proximal caries detection (dentin detection level) · Patients with permanent posterior teeth, proximal surfaces assessed clinically (in vivo) · In vivo (clinical); permanent posterior teeth, proximal surfaces, Dentin detection level Systematic review and meta-analysis of diagnostic studies of proximal surface caries. (2021) | Specificity 0.76 [0.11, 0.99] | 2 studies | Ungraded |
Poor / no tooth brushing habit vs Good tooth brushing habit Dental caries (presence) · Individuals in East Africa assessed for dental caries · Community- and school-based populations, East Africa Prevalence of Dental Caries and Associated Factors in East Africa, 2000-2020: Systematic Review and… (2021) | OR 1.967 [1.205, 3.211] | 10 studies · 4927 participants | Ungraded |
Visual examination (VE) vs Cavity preparation or biopsy (operative validation) Diagnostic accuracy for occlusal caries detection at the caries detection level (D0 versus D1-D4) · Human permanent posterior teeth (premolars and molars) in patients, occlusal (pit-and-fissure) surfaces · in vivo Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | Specificity 0.47 [0.26, 0.70] | 2 studies | Ungraded |
Conventional bitewing radiography (D-speed film) vs Cavity preparation or biopsy (operative validation) Diagnostic accuracy for occlusal caries detection at the dentin caries detection level (D0-2 versus D3-4) · Human permanent posterior teeth (premolars and molars) in patients, occlusal (pit-and-fissure) surfaces · in vivo Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | Specificity 0.75 [0.68, 0.82] | 2 studies | Ungraded |
Observed population vs Not applicable Mean dmft/DMFT · School children aged 12-14 years in Dubai schools · Overall Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | MEAN 1.83 | 1 study · 2237 participants | Ungraded |
Lower parental (maternal/paternal) education vs Higher parental education Dental caries · Healthy children and adolescents in the United Arab Emirates · UAE; schools/nurseries Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | Maternal education was not associated with children's caries in the Hashim et al. studies, whereas father's educational level was negatively associated with DMFT in Khadri et al. (secondary-aged children: -0.35, 95% CI… | NR | Ungraded |
Leukemia (oral health status) vs None (descriptive; compared by treatment location) Oral health problems (mucositis, caries, candidiasis) · Children with leukemia in the United Arab Emirates · UAE Oral Health of Children and Adolescents in the United Arab Emirates: A Systematic Review of the Past Decade. (2021) | Alnuaimi et al. reported a 60% prevalence of oral problems (mostly oral mucositis/ulceration, then dental caries and oral candidiasis) among children with leukemia; prevalence was not associated with age, gender,… | 1 study | Ungraded |
Laser fluorescence (DIAGNOdent 2095) vs Cavity preparation or biopsy (operative validation) Diagnostic accuracy for occlusal caries detection at the dentin caries detection level (D0-2 versus D3-4) · Human permanent posterior teeth (premolars and molars) in patients, occlusal (pit-and-fissure) surfaces · in vivo Systematic review and meta-analysis of diagnostic methods for occlusal surface caries. (2021) | DOR 35.90 [13.43, 96.00] | 2 studies | Ungraded |
Glass ionomer cement vs Amalgam Success rate at 5 years · Patients needing retrograde filling in root canal therapy (orthograde root canal filling or retreatment not possible;… · 5 years Materials for retrograde filling in root canal therapy (2021) · Cochrane | RR 1.00 [0.84, 1.20] | 1 study | Ungraded |