Orthodontic treatment of unilateral cleft lip and alveolus patient with maxillary lateral incisor missing: case report.

The esthetics of a patient with a cleft lip and alveolus and missing maxillary lateral incisor is important. A girl, aged 9 years 3 months with repaired left unilateral cleft of primary palate only was referred for orthodontic evaluation of her anterior tooth-crowding. She was unhappy with the unattractive appearance of her maxillary anterior teeth, which were behind her mandibular anterior teeth. Alveolar bone grafting along with canine substitution to replace her missing lateral incisor were recommended for this patient. The post-treatment results were excellent with good occlusion, acceptable profile, and remained stable one year after conclusion of active treatment.

Cytotoxicity evaluation of single component dentin bonding agents.

This study evaluated the cytotoxicity of four single component dentin bonding agents: Syntac Single Component, Prime & Bond 2.1, Single Bond and One Up Bond F. The test materials were applied on dentin discs of dentin barrier models in the same way as in the clinical procedures recommended by each manufacturer. Cell viability of L 929 after exposure with the bonding agents was determined by MTT assay. The results revealed that cell survival of the first three bonding agents was 60%, while the fourth was an impressive 93%. This study showed that a total-etching bonding system is more cytotoxic than a self-etching bonding system.