Meta-analysis topic ideas in dentistry and oral health

Dental research publishes a high volume of small clinical trials, in vitro studies and animal experiments, and a high volume of systematic reviews of them. Implantology, periodontology, orthodontics, endodontics and paediatric dentistry are busy fields, and many questions already have several reviews.

The biggest design issue is the unit of analysis. A mouth has many teeth, and a patient can contribute several implants or lesions. Whether the review counts patients, teeth, sites or restorations decides whether the results are valid.

Find a dentistry and oral health topic that has not been done

SynthGap searches the published literature, checks each candidate against existing systematic reviews, and proposes topics with the primary studies behind them. Start on the Free plan: no card needed, and every run shows every topic it finds.

Where gaps tend to hide in dentistry

Materials and restorations

New restorative materials, adhesives and sealants are tested in short trials, often with the tooth as the unit. Longer follow-up and standard criteria for success remain under-studied.

Periodontal and peri-implant disease

Adjunctive treatments for periodontitis and peri-implantitis have small trials with different measures (probing depth, bleeding, attachment level).

Orthodontics

Techniques to speed tooth movement, retention protocols and different appliances have small trials with varying outcomes.

Children's dentistry

Caries prevention and management in children (fluoride, sealants, silver diamine fluoride, minimally invasive techniques) have trials with different settings and caries definitions.

Oral health and general health

Associations between periodontal disease and conditions such as diabetes and cardiovascular disease rest on observational studies. Evidence on the effect of treating gum disease on those outcomes is more limited.

Outcomes and effect measures that pool well in dentistry

Probing depth, clinical attachment level and bleeding on probing: mean differences, with a statement of whether site, tooth or patient was the unit.
Restoration survival and success: risk ratios or hazard ratios, using the criteria stated (FDI or USPHS).
Implant survival and marginal bone loss: risk ratios for survival and mean differences in millimetres for bone loss, at a stated time after loading.
Caries increment (DMFT, dmft, ICDAS): mean differences in increment, with the caries threshold given.
Postoperative pain after dental procedures: mean differences on a visual analogue scale at stated times.

Common traps in dental reviews

Treating several teeth or implants in one patient as independent observations.
Including in vitro and animal studies in an analysis of clinical effect.
Using different caries detection thresholds (cavitated or not) as if they were comparable.
Short follow-up for restorations and implants, where failure takes years.
Split-mouth trials analysed as if they were parallel.

Check before you commit

Before committing months to a topic, check that nobody has beaten you to it. Search PubMed with its systematic review filter, the Cochrane Library, the PROSPERO register (for reviews that are registered but not yet published) and Epistemonikos. Look at how recent the latest review is and whether new trials have appeared since its search date. Step-by-step guide.

Starting points to try in SynthGap

These are areas to explore, not claims that they are open. Some may already be well covered, and finding that out quickly is the point.

Silver diamine fluoride for caries arrest in children: concentration and frequency
Adjunctive therapies for peri-implantitis
Long-term survival of different restorations for molars with deep lesions

Questions

How do I check whether a dental meta-analysis already exists?

Search PubMed with the systematic review filter, the Cochrane Library (Cochrane Oral Health), PROSPERO and Epistemonikos. Dental topics often have many reviews, so check what the primary studies added after the last search.

How should I handle several teeth per patient?

Prefer analyses at the patient level, or use methods that account for clustering. If trials report at the tooth level without adjustment, note the risk of overstated precision.

Can I combine in vitro and clinical studies?

No. In vitro studies can be summarised in a separate review, but they do not answer a clinical question and should not be pooled with clinical outcomes.

Other specialties

This page is general methodological guidance, not medical advice, and it does not list specific unreviewed topics. SynthGap's suggestions are AI-generated from the published literature, so verify them before registering a protocol.