Biological Reactions Flashcards
Why is the dentinopulpal organ called as such despite the dentin and pulp having different structures?
They react to any stimulus as a one functional unit
Any irritation to the odontoblasts, leads to the formation of:
Tertiary dentin (over 4–6 weeks)
Reactionary dentin is secreted by:
Existing odontoblasts
Reparative dentin is secreted by:
Newly formed odontoblastoid cells
Reactionary dentin is delineated from the pulp by the:
Calcio-traumatic line
Which type of cutting instruments shows better biological properties?
Hand cutting instruments
Dentin is a thermal:
Insulator
Dentin’s thermal insulating capacity’s range:
Between 85° F and 130°F (29.4º C - 54.4º C)
Rebound response for bur application appears microscopically as:
Necrosis
Pathological exposure of the pulp during cavity preparation occurs during:
Excavation of carious dentin
The depth of the cavity in dentin and enamel is defined as:
Actual cavity depth
The thickness in a dentin bridge separating the pulp from the floor of the cavity refers to:
Clinical cavity depth
The distance along the wavy course of the dentinal tubules between the pulp and the floor of the cavity
Effective cavity depth
The most accurate study of the pulp response is by determining the:
Effective cavity depth
Which material is indicated to line deep cavities where the remaining dentin bridge is less than 0.5-mm?
Calcium hydroxide (pulp capping material)
Which material is used as a base under metallic restorations?
Zinc phosphate cement
When does amalgam show marginal seal development?
Within 12 weeks
The biocompatibility of amalgams is due to the:
Release of corrosion products which block marginal gaps
GIC can be considered biocompatible as:
It is anticariogenic due to fluoride release
Which is the only dental material that if carefully placed and finished can approximate the cavosurface margin with zero marginal gap & good marginal seal and last longer than any other dental material?
Gold (direct restoration)
Ceramic restorative materials are not known to cause any biological reactions, except for:
Wear to the opposing tooth/restoration
Nearly all composites shrink from:
0.6–1.4%
Which dental impression material shows no inflammatory response?
Addition silicone
All cements are soluble except:
Resin cement
The three major post-operative problems:
1- Post-operative sensitivity
2- Pulpitis
3- Secondary caries
Faulty axial inclination causes:
Stress on periodontal ligament
How to overcome improper buccal and lingual contour & axial inclination?
Proper matricing or double-matricing
In a deep amalgam cavity, which base should be placed?
Cement
In a moderate amalgam cavity, what should be placed?
Varnish
