• Sarunporn Luangchaichaweng D.D.S.
• Poonsak Pisek D.D.S., M.Sc. (orthodontics), F.R.C.D.T. (orthodontics)
• Patimaporn Pungchanchaikul D.D.S., MclinDent (Paediatric Dentistry), Ph.D.

Molar incisor hypominieralization (MIH) is one of the developmental enamel defects.
The lesion, which has less inorganic deposition than surrounding normal enamel, usually involves one
or more of the first permanent molars and may involve the upper incisors. Etiology is not clear at the
present. Several reports suggest an increasing prevalence in Thailand and all over the world. Enamel
lesions are brittle, which lead to breaking down and subsequently, rapid progressiveness of dental
caries. Diagnosis given immediately after the eruption is crucial for prevention and restoration of
the affected molars, in order to prevent tooth loss. However, for the tooth with severe lesion that is
unable to restore or bears a poor long-term prognosis, extraction at a proper stage may be one of
the suitable treatment options. Three affected cases with severe MIH defects have been followed for 3
years after primarily treatments. Each patient had initially inquired for dental management at various
developmental stages. This report could, at least in part, provide a guideline for dental management
for such cases with severe molar incisor hypomineralization defects.

(CU Dent J. 2013;36:189-206)