Study Notes

Reaction PMMA powder makes mixture viscous for manipulation before curing. Chemical accelerators cause decomposition of benzoyl peroxide into free radicals that initiate polymerization of monomer New PMMA is formed into a matrix that surrounds PMMA powder. Linear shrinkage of 5% to 7% during setting. but dimensions of appliances are not critical…

EPIDEMIOLOGY Epidemiology is the study of the Distribution and determinants of disease frequency in Humans. Epidemiology— study of health and disease in human populations and how these states are influenced by the environment and ways of living; concerned with factors and conditions that determine the occurrence and distribution of health. disease, defects. disability and deaths among individuals Epidemiology, in conjunction with the statistical and r…

Time for tooth development Entire primary dentition initiated between 6 and 8 weeks of embryonic development. Successional permanent teeth initiated between 20th week in utero and 10th month after birth Permanent molars between 20th week in utero (first molar) and 5th year of life (third molar)…

The Cheeks The cheeks (L. buccae) form the lateral wall of the vestibule of the oral cavity. They have essentially the same structure as the lips with which they are continuous. The principal muscular component of the cheeks is the buccinator muscle. Superficial to the fascia covering this muscle is the buccal fatpad that gives cheeks their rounded contour, especially in infants. The lips and cheeks act as a functional unit (e.g. during su…

 Biomechanics & Support Clasp Arm Flexibility Inversely proportional to diameter: thinner clasp arms are more flexible. Posterior Tooth Support Teeth with divergent roots offer better periodontal support and stability.  Abutment Selection Lateral Incisor Not ideal as abutment due to low pericemental area and poor root morphology.  Phonetics & Tooth…