Belgian Study Will Compare Caries Burden in Children With Cleft Lip and Palate
Children born with cleft lip and/or palate often enter a long treatment pathway that extends far beyond surgery. Dental risk follows them through childhood, and this new study from Cliniques universitaires Saint-Luc in Brussels is designed to measure how much that risk translates into tooth decay and enamel damage across the upper front teeth and beyond.
The protocol focuses on a practical question with real bedside consequences: do children and adolescents with a cleft carry more dental caries and more developmental enamel defects than age-matched peers without a cleft? The investigators will also examine whether the pattern changes according to cleft type, prior surgery, and the everyday factors that shape oral health, including brushing habits, diet, parental education, and the mobility of the scarred upper lip.
For families and clinicians, the issue is not abstract. Scar tissue around the lip can make brushing awkward, and the teeth most exposed to altered anatomy may be the same teeth that matter most cosmetically and functionally during childhood.
Why the Upper Front Teeth Are Under Scrutiny
The study is built around a biologically plausible concern: a cleft involving the lip and/or alveolus can alter access for cleaning, change the local environment around erupting teeth, and complicate early preventive care. Enamel defects add another layer of vulnerability. Hypomineralisation and hypoplasia can leave the tooth surface less resistant to acid attack, which means plaque accumulation and dietary sugar exposure may cause damage more quickly than in teeth with intact enamel.
Researchers plan to compare about 200 patients aged 2 to 18 years with any cleft phenotype — isolated cleft lip, isolated cleft palate, cleft lip and alveolus, or cleft lip and palate, with or without an associated syndrome — against about 200 healthy children and adolescents of the same age range. The control group will come from routine pediatric dentistry visits at the same hospital, which should help keep the comparison grounded in a similar clinical setting.
This is not a drug trial and not a device study. No treatment is being tested, and routine care will not change. Instead, the protocol adds standardized clinical assessments and questionnaires to a dental visit that is already part of normal follow-up.
What the Dental Exam Will Capture in a Single Visit
The study visit is designed to be efficient. Each child will undergo a standard oral examination with recording of decayed, missing, and filled teeth, expressed as the DMFT index in primary and permanent dentition. Teeth will also be screened for enamel defects using a standardized European approach, the Developmental Defects of Enamel index.
A single sentence captures the main clinical thrust of the protocol: the teeth most affected may be identified before they become a pattern of repeated restorative care.
For children in the cleft group, the mobility of the upper lip will be assessed with a clinical scale. That measurement may help connect surgical scarring with a very everyday problem — the ability to brush the upper anterior teeth effectively. Intra-oral photographs may also be taken to document findings, while radiographs will be used only if they are already clinically indicated as part of standard care. No X-rays will be taken solely for research.
Parents or legal guardians will complete short questionnaires covering medical and dental history, oral hygiene habits, eating patterns, and exposure to caries risk and protective factors through a CAMBRA-based framework. The protocol also asks about early-life factors that could be associated with enamel defects, which may help sort out whether vulnerability begins before school age or emerges later as permanent teeth erupt.
What the Trial Could Clarify About Risk in Cleft Care
If the cleft group shows a higher burden of decay or enamel defects, the findings could sharpen how pediatric dental teams target prevention. The most actionable implication may be geographic within the mouth: if the maxillary anterior teeth carry a disproportionate load of disease, clinicians may need to intensify preventive counseling, adapt brushing tools, and build follow-up around those teeth earlier than they do now.
The study also aims to connect disease burden with cleft type and surgical history. That matters because not every cleft presents the same anatomy, and not every repair leaves the same scar burden. A child with a cleft lip alone may face different access problems than a child with a cleft lip and palate, and the protocol is structured to examine those distinctions rather than treating all clefts as one category.
The same logic applies to enamel defects. If hypomineralisation or hypoplasia clusters in specific locations, that could point to developmental vulnerability rather than only a cleaning problem. Enamel formed under stress is less forgiving once the tooth erupts, and that makes early identification clinically important even before caries appears.
Prevention Strategy, Not Just Measurement
The official purpose of the study is prevention, and the design reflects that emphasis. There is no added burden of extra appointments, and participation is limited to one visit. Minimal risk is a central feature of the protocol because the study relies on routine examination, standardized questionnaires, and documentation that would fit naturally into pediatric dental follow-up.
For the cleft population, prevention often needs to be tailored rather than generic. A toothbrush that works well for one child may be ineffective when lip mobility is limited by scar tissue. Oral hygiene advice may need to be more specific, more hands-on, and better adapted to the anatomy left behind after repair. The study is explicitly built to generate evidence for those adjustments.
Parents will also be asked about habits and early-life exposures because caries rarely has a single cause. Diet, cleaning frequency, access to dental care, and family-level health literacy can all influence whether vulnerable teeth stay intact or drift toward repeated restoration. In children with cleft, those factors may interact with anatomy in ways that standard dental risk assessments do not fully capture.
A Brussels Cohort With Broader Clinical Relevance
Enrollment is estimated at 400 children and adolescents, with study start projected for December 2026, primary completion by the end of 2027, and final completion in mid-2028. The work will be conducted at the Cleft Lip and Palate Centre and the pediatric dentistry service of Cliniques universitaires Saint-Luc in Brussels, Belgium.
Because the trial is observational within a clinical visit, it will not answer treatment questions directly. It will, however, define who is most vulnerable, where the damage tends to concentrate, and which readily observable features — cleft type, scar-related lip mobility, diet, hygiene, family background, or enamel phenotype — track with that risk.
Those details matter in daily practice. A child who looks stable after surgical repair can still carry a hidden dental burden that only appears once enamel defects and access problems are measured together. This protocol is designed to make that burden visible before it becomes irreversible restorative disease.