Dental Bonding, Curing, and Restoration Techniques: Key Concepts for Students

A clinician over-dries dentin after etching. Which of the following is the MOST likely outcome?

Collapse of collagen network preventing infiltration

A universal adhesive is used without selective enamel etching on a Class II restoration. Which failure is MOST likely long-term?

Adhesive failure at enamel margin

During bonding, the adhesive appears matte instead of glossy after air thinning. What is the MOST appropriate next step?

Apply another layer of adhesive

Which scenario would MOST compromise hybrid layer formation?

Desiccated dentin

A clinician etches dentin for 30 seconds instead of 15. What is the MOST likely effect?

Increased sensitivity due to over-demineralization

Which condition BEST explains reduced dentin bond strength despite proper etching?

Collapse of collagen fibrils

A bonding agent bottle is left open for several minutes. What is the MOST likely consequence?

Solvent evaporation reducing infiltration ability

Which of the following MOST directly contributes to hybrid layer formation?

Resin infiltration into collagen matrix

Which clinical step MOST affects resin tag formation in dentin?

Etch time

Which bonding strategy provides the BEST balance between enamel bond strength and dentin sensitivity?

Selective enamel etch + universal adhesive

Which error MOST likely leads to postoperative sensitivity?

Over-drying dentin

Which of the following would MOST reduce adhesive penetration?

Evaporated solvent

A clinician skips rinsing after etching. What is the MOST likely result?

Residual acid interfering with polymerization

Which substrate is MOST forgiving during bonding errors?

Enamel

Which factor MOST influences dentin bonding variability?

Tubule density and fluid

What is the PRIMARY role of primer in bonding systems?

Facilitate resin infiltration into dentin

Which clinical situation MOST benefits from multi-bottle systems?

Maximum bond strength requirement

Which error MOST reduces enamel bond strength?

Not etching enamel

Which factor MOST affects adhesive polymerization?

Light wavelength

Which step is MOST critical for preventing nanoleakage?

Proper hybrid layer formation

Which cavity configuration produces the HIGHEST polymerization stress?

Class I

Why does a high C-factor increase stress?

Restricted flow during polymerization

Which technique MOST reduces cuspal deflection?

Oblique layering

Which increment placement creates the LEAST shrinkage stress?

Oblique

A restoration fails at the gingival margin. Which factor is MOST responsible?

High C-factor

Which factor MOST contributes to incomplete curing in deep proximal boxes?

Light attenuation from scattering

What is the MOST effective method to reduce polymerization shrinkage stress?

Incremental layering

Which material property MOST influences light penetration?

Filler particle size and distribution

Which curing approach BEST reduces shrinkage stress?

Soft-start curing

What happens if composite is cured too quickly?

Increased internal stress

Which factor MOST reduces depth of cure?

Darker shade composite

Why is oblique layering preferred in Class II restorations?

Reduces bonded surfaces per increment

What is the MOST likely outcome of bulk filling a deep cavity?

Incomplete polymerization at base

Which factor MOST affects cuspal deflection?

Shrinkage stress magnitude

What is the MAIN purpose of flowable liner?

Stress absorption

Which scenario increases risk of marginal gap formation?

High C-factor + bulk fill

Which technique MOST improves proximal adaptation?

Snowplow technique

What is the risk of curing composite beyond recommended thickness?

Under-cured base

Which factor MOST affects polymerization kinetics?

Light intensity

Which step MOST reduces internal voids?

Incremental placement with adaptation

What is the MAIN disadvantage of flowable composite?

Lower wear resistance

Why must SDR be covered with another composite?

Insufficient occlusal strength

What is the MAIN function of a matrix system?

Re-establish proximal contour and contact

Why is Tofflemire less ideal for composite?

Flat band causes poor contour

What is the advantage of dead-soft matrix bands?

Better contour adaptation

Why is burnishing important in matrix placement?

Improves contact formation

What is the MOST common cause of open contact?

Inadequate tooth separation

Why is pre-wedging performed?

To create initial separation

What is the purpose of wedges?

Seal gingival margin and create separation

What happens if wedge is too large?

Band distortion and poor contour

What is the MAIN advantage of sectional matrices?

Better anatomical contour

Why is a second cure done after matrix removal?

Ensure full proximal polymerization

What is the purpose of Garrison ring?

Tooth separation and stabilization

Why is band orientation important in sectional matrices?

Ensures proper contour

What is the consequence of poor gingival adaptation?

Overhang formation

What is the purpose of DME band?

Elevate deep margins

Why is proximal contact critical?

Prevents food impaction

What is the FIRST step in finishing and polishing?

Contouring

Why must finishing be done before polishing?

Remove defects before luster

What happens if polishing is skipped?

Rough surface and plaque retention

What is the role of carbide finishing burs?

Gross contouring

Why do fewer flutes cut more aggressively?

Larger cutting edges

What is the purpose of finishing strips?

Contour proximal surfaces

Why should strips be thin?

Avoid altering contact

What is the purpose of polishing paste?

Final luster

What causes white lines in composite?

Microfractures or incomplete cure

What is the BEST treatment for white lines?

Polish or replace

What must be checked before polishing?

Margins, contour, occlusion

What is the MAIN cause of gingival inflammation from restorations?

Rough margins

Define Class V lesion location.

Gingival third of facial/lingual surface

What pH causes enamel demineralization?

5.5

What pH causes dentin demineralization?

6.5

What causes abrasion lesions?

Mechanical wear

What causes erosion lesions?

Chemical dissolution

What causes abfraction?

Tooth flexure stress

What is shape of abfraction lesion?

V-shaped

Why restore NCCLs?

Sensitivity, fracture risk, esthetics

What is best isolation for Class V?

Rubber dam

What happens with moisture contamination?

Reduced bond strength

Which prep uses 90-degree margins?

Amalgam conventional

Why bevel enamel margins?

Improve retention and esthetics

Why no bevel on cementum?

Poor bonding substrate

When is retention groove indicated?

When bonding is insufficient

Where is retention groove placed?

Gingivoaxial line angle

What bur is used for retention groove?

#2 round bur

Why axial wall is convex?

Follow tooth anatomy

Which material releases fluoride?

RMGI

Why use RMGI in cervical lesions?

Fluoride release and moisture tolerance