Caries & Restorative Dentistry

Question 1

Important bacteria in caries

Answer 1

S.Mutans ——— initiation of caries. Lactobacillus —— propagation of caries Actinomycetes —- cause root surface caries

Question 2

Indications of stainless steel crowns

Answer 2

1- extensive decay in primary and young permanent teeth (rampant). 2-teeth with developmental or hypo plastic defects 3- after pulp therapy. 4-as preventive restoration in high caries susceptible patients. 5- as an abutment for space maintainer 6- as temporary restoration of fractured tooth 7- in case of single tooth cross bite by using reverse stainless steel crown

Question 3

Down ‘s syndrome and caries

Answer 3

Incidence of dental caries is low in Down’s syndrome but PERIODONTAL DISEASE IS MUCH HIGHER

Question 4

Tooth preparation for stainless steel crown

Answer 4

Buccal and lingual —0.5 mm (least reduction) Occlusal— 1.5-2mm. Proximal—-1-1.5mm. Gingival termination—-0.5 -1mm into sulcus. Gingival finish line—feather edge

Question 5

Primary teeth enamel and dentin thickness

Answer 5

Primary teeth has THIN ENAMEL and DENTIN. With large pulp chamber. Enamel thickness::: Primary teeth—approximately 1mm Permanent teeth —-2-3 mm

Question 6

Rubber dam size

Answer 6

55”—-size for children. 66”___size for adults

Question 7

Salivary factors and their Role -1. HCO3, UREA ,PROTEINS ——

Answer 7

BUFFERING ACTION

Question 8

Salivary factors and their Role -2. LYSOZYME,LACTO PEROXIDASE——

Answer 8

Breaks bacterial cell walls, Oxidation of susceptible bacteria

Question 9

Salivary factors and their Role -3. STATHERIN , PROLINE - rich proteins

Answer 9

Bind to hydroxyapatite, Aid in supersaturation of saliva , Make tooth resistant to caries

Question 10

RIGAFEDE DISEASE

Answer 10

Characterised by laceration of lingual surface of tongue because of the sharp incisal edges of the natal and neonatal teeth

Question 11

KEYS TRIAD

Answer 11

Keys triad includes———- 1— HOST/TOOTH. 2—MICROFLORA. 3—SUBSTRATE to meet the requirements of microflora {NEWBRUN CARIES TETROLOGY includes a 4 th factor TIME to existing Keyes concept }

Question 12

ESTHETIC PREFORMED CROWNS ::: 1–POLYCARBONATE

Answer 12

-They SAVE TIME -Easy to TRIM. -can be easily adjusted with PLIERS

Question 13

ESTHETIC PREFORMED CROWNS ::: 2–STRIP CROWNS

Answer 13

-These are crown forms which are filled with composites and bonded on the tooth and the crown is then REMOVED -Most COMMONLY USED in pediatric dental practice. -Easy to REPAIR