The bond strength of resin based fissure sealants to affected MIH can be enhanced by pre-treating with 5% sodium hypochlorite for one minute after etching, and applying a bonding agent. However, more evidence is needed from clinical based studies. Direct restorations
Cavity design
There is still much debate of whether margin extension should include removal of all defective enamel or only the porous enamel. The former provides sound enamel for bonding but leads to excessive tooth tissue loss. The latter is less invasive, but the margins may have a high risk of breakdown due to defective bonding. Yet, it is agreed that adhesive restorations should be used as opposed to those reliant upon mechanical retention (such as amalgam). Composite resin restorations
Composite resin material has been shown to have longer-term stability in MIH teeth, with a median survival rate of 5.2 years and a success rate of 74%-100%  during a 4-year follow-up period. Self-etching adhesive was found to have better bond strength to enamel affected by MIH compared to total etch single-bottle adhesive. The use of composite should be considered both for permanent molars affected by MIH, as well as incisors. Furthermore, composite veneers may achieve a better aesthetic result where deep lesions are seen in incisors. Glass ionomer cement (GIC) restorations
GIC materials have adhesive capabilities with both enamel and dentine, long-term fluoride release and hydrophilicity when there is inadequate moisture control intra-orally, during early post-eruptive stages. However, GIC’s poorer mechanical properties suggest avoidance in stress-bearing areas.
Encephalocele is a neural tube defect characterized by sac-like protrusions of the brain and the membranes that cover it through openings in the skull. These defects are caused by failure of the neural tube to close completely during fetal development. Encephaloceles cause a groove down the middle of the skull, or between the forehead and nose, or on the back side of the skull. The severity of encephalocele varies, depending on its location. Signs and symptoms
Encephaloceles are often accompanied by craniofacial abnormalities or other brain malformations. Symptoms may include neurologic problems, hydrocephalus (cerebrospinal fluid accumulated in the brain), spastic quadriplegia (paralysis of the limbs), microcephaly (an abnormally small head), ataxia (uncoordinated muscle movement), developmental delay, vision problems, mental and growth retardation, and seizures. Causes
Since its earliest cited case in the 16th century, many generations of scientists have attempted to explain the cause. Little has been revealed in the centuries to follow. Although the exact cause is unknown, encephaloceles are caused by failure of the neural tube to close completely during fetal development. Both environmental and genetic factors have been seen to contribute to the cause of encephaloceles. Some studies have revealed a higher occurrence in female embryos, suggesting a genetic cause.