Orthodontic materials: An overview of research on orthodontic alloys and ceramics.- Research on orthodontic polymers.- Assessment of biological action of materials : biocompatibility testing protocols. Computers in orthodontic research: §§Computers in orthodontic research. Clinical orthodontic research: Clinical research and epidemiological studies.- Meta-analysis and bias in clinical research.- Key issues in designing epidemiologic and clinical studies in orthodontics. Biological research in orthodontics: Tooth movement and craniofacial growth: evolution of study models.§§ sakriti opis