s10 - Restoration Failure Flashcards
What is the primary goal of conservative dentistry?
To stop the original insult of caries, erosion, or attrition and prevent its recurrence.
Why is it important for restorations to seal their interface hermetically?
To prevent
- marginal leakage,
- recurrent caries,
- marginal discoloration,
- pulp irritation.
What are the key considerations for achieving effective cavity preparation?
- Correct outline form,
- complete caries removal,
- retentive pits/fissures removal
- , and smooth, esthetic margins.
How does conservative dentistry restore efficient mastication?
By sedating the pulp, eliminating caries, and using strong permanent restorations that withstand mastication forces.
What is the significance of maintaining tight interproximal contacts in conservative dentistry?
To avoid food impaction, plaque retention, and periodontal issues.
What is the main reason for failure in cavity preparation?
Improper outline form, inadequate caries removal, and improper extension.
How can faulty material manipulation lead to restoration failure?
- Inadequate mixing
- , improper setting
- , moisture contamination,
- and incorrect placement can compromise strength and adaptation.
Why is material mis-selection a cause of restoration failure?
Because the chosen material may not meet the demands of the oral environment or the properties required for durability.
How can poor patient compliance lead to restoration failure?
Neglect of oral hygiene, poor dietary habits, and failure to attend follow-up visits increase failure risk.
Why does incorrect treatment planning contribute to failure?
It leads to inappropriate restoration design and material choice, compromising function and longevity.
What is marginal ditching in mechanical failure?
Chipping of a thin edge of a restoration, leading to a V-shaped marginal crevice.
What factors lead to marginal ditching?
- Acute cavo-surface angle,
- thin marginal flash
- , improper finishing,
- inadequate bulk.
What causes gross isthmus fracture in restorations?
- Incorrect cavity design
- , lack of retentive features
- , premature contacts,
- high tensile stresses.
Why does dislodgement of restorations occur?
Inadequate retention, poor cementation, contamination during bonding, and excessive occlusal loading.
How does wear of restorative materials contribute to failure?
Excessive abrasion, attrition, chemical erosion, and poor wear resistance.
What clinical complications arise from excessive wear of restorations?
- Marginal fracture,
- staining,
- plaque retention,
- patient discomfort,
- further wear.
What are the main factors contributing to tooth fracture in restored teeth?
- Bruxism,
- biting on hard objects,
- large restorations weakening the tooth,
- and improper cavity design.
How does creep contribute to marginal failure in amalgam restorations?
Gradual deformation under mastication forces, leading to margin protrusion and loss of support.
What role does inadequate bulk of material play in failure?
Thin margins fracture easily under stress, leading to loss of restoration integrity.
Why is the location of cavity margins critical in preventing failure?
Margins too close to central fissures or unsupported enamel are prone to fracture and leakage.
What biological factors can lead to restoration failure?
Recurrent caries, improper contact points, and bacterial plaque stagnation.
How can open or improper contacts affect restoration success?
They lead to food impaction, periodontal inflammation, and recurrent caries.
Why is protection of the dentin-pulp complex essential?
To prevent hypersensitivity, pulp inflammation, and possible necrosis.
How can premature contacts lead to biological failure?
They cause excessive force, resulting in tooth mobility, pain, and fracture.
What is the consequence of improper finishing and polishing of restorations?
Increased plaque retention, caries recurrence, and gingival irritation.
Why is gross marginal leakage considered a biological failure?
It leads to bacterial invasion, secondary caries, and potential pulpal damage.
How does a faulty bonding technique impact restoration success?
It allows marginal leakage, bacterial penetration, and possible restoration dislodgement.
What role does the patient’s oral hygiene play in preventing biological failure?
Poor oral hygiene leads to plaque accumulation, recurrent caries, and periodontal issues.
What causes marginal staining around restorations?
Improper finishing, polymerization shrinkage, and incomplete sealing.
How does surface staining impact esthetics?
It leads to a dull, unattractive appearance and patient dissatisfaction.
What are the effects of bulk discoloration in restorations?
Compromised esthetics due to material degradation, contamination, and moisture absorption.
How does incorrect shade selection contribute to esthetic failure?
It leads to a poor color match, reducing the natural appearance of the restoration.
Why can surface roughness lead to esthetic failure?
It increases plaque accumulation, staining, and patient discomfort.
How can marginal leakage affect esthetic outcomes?
It results in dark, visible marginal lines and possible recurrent caries.
What factors contribute to the loss of translucency in restorations?
Incorrect material selection, excessive water sorption, and inadequate polymerization.
Why is surface gloss important in esthetic restorations?
It enhances visual appeal and reflects a polished, natural tooth surface.
What is marginal ditching?
Chipping or disintegration of a thin edge of a restoration, creating a V-shaped crevice.
Why is inadequate bulk of restorative material a cause of marginal ditching?
Thin margins fracture easily under mastication forces.
How does improper cavity design contribute to marginal ditching?
Incorrect cavo-surface angles and unsupported enamel lead to margin failure.
What material manipulation errors lead to marginal ditching?
Over-carving, under-trituration, excess mercury, and improper condensation.
What role does creep play in marginal ditching for amalgam restorations?
Gradual deformation under masticatory forces causes margin protrusion and fractures.
What is gross isthmus fracture?
A fracture that occurs between the principal and auxiliary portions of a restoration.
What factors increase tensile stresses at the isthmus?
Premature contacts, improper cavity design, and inadequate retention.
How can premature biting on a hard object lead to an isthmus fracture?
It concentrates stress at the weakest area, causing a fracture.
How does poor condensation increase the risk of an isthmus fracture?
It creates internal voids that weaken the material’s structural integrity.
What material-specific factors lower the tensile strength of amalgam, leading to isthmus fractures?
Excess mercury, moisture contamination, and insufficient condensation.
What are the primary causes of restoration dislodgement?
Inadequate cavity retention, improper cementation, and contamination.
Why does improper bonding of direct restorations lead to dislodgement?
Contamination during bonding reduces the bond strength.
How does excessive occlusal loading contribute to dislodgement?
It surpasses the material’s strength, causing it to detach.
What role does patient compliance play in preventing dislodgement?
Following post-operative care instructions helps maintain restoration integrity.
What are the main types of tooth fractures associated with restorations?
Cusp fracture, craze lines, cracked tooth, root fracture, and chipping.
What causes a cusp fracture in a restored tooth?
Excessive wear, large restorations, and incorrect cavity design.
Why is bruxism a significant factor in tooth fracture?
It generates excessive and repetitive stress on the tooth structure.
How can improper cavity preparation lead to tooth fracture?
Overcutting or leaving unsupported enamel increases the risk of fractures.
What are the consequences of root fractures in restored teeth?
They may lead to loss of the tooth, requiring extraction or endodontic treatment.
What factors increase wear on restorative materials?
Abrasion, attrition, chemical erosion, and regurgitation.
How can dietary habits contribute to excessive wear?
Acidic foods and beverages accelerate surface degradation.
What restorative materials have the highest wear resistance?
Gold and ceramic restorations.
What are the clinical manifestations of excessive wear?
Loss of occlusal anatomy, staining, and plaque accumulation.
How does reduced salivary flow affect wear on restorations?
Decreased lubrication increases friction and wear.
Why is maintaining proper proximal contact critical?
It prevents food impaction, periodontal inflammation, and tooth drifting.
How does improper proximal contact lead to premature restorative failure?
Open contacts cause food impaction, leading to caries and soft tissue trauma.
What complications arise from tight proximal contacts?
Pain, discomfort, and difficulty in flossing, leading to poor oral hygiene.
How does incorrect contact location affect restoration success?
Contacts too occlusal or gingival disrupt normal occlusal and periodontal function.
What are iatrogenic factors in restoration failure?
Errors by the clinician, including misdiagnosis, improper treatment planning, and faulty material manipulation.
How can mis-selection of the restoration lead to failure?
Inappropriate material or technique choice may not withstand oral conditions.
Why does improper cavity design cause failure?
It compromises retention, resistance, and marginal integrity.
What is the impact of incorrect finishing and polishing on restoration success?
It leads to plaque accumulation, marginal leakage, and caries recurrence.
How do inadequate anti-caries regimes influence restoration failure?
Poor preventive measures increase the likelihood of recurrent caries.
What are inherent material deficiencies?
Limitations within the material’s physical and chemical properties, like low tensile strength or excessive brittleness.
How can polymerization shrinkage lead to restoration failure?
It causes marginal gaps, resulting in leakage and recurrent caries.
Why are some materials more prone to wear than others?
Due to differences in hardness, filler content, and resistance to abrasion.
What happens when a material lacks sufficient corrosion resistance?
It deteriorates over time, losing strength and esthetics.
How does poor oral hygiene contribute to restoration failure?
Plaque accumulation increases caries risk and gingival inflammation.
Why is patient education essential for restoration longevity?
Understanding care instructions minimizes damage and maintains function.
How do harmful oral habits affect restorations?
Habits like bruxism or nail-biting can cause wear, fractures, and dislodgement.
Why is dietary modification significant for restoration success?
Reducing acidic and sugary foods decreases wear and caries risk.
How do thermal and pH fluctuations impact restorations?
They cause expansion, contraction, and marginal leakage.
Why are bio-degradation and microbial activities a concern?
They degrade material surfaces, creating roughness and harboring plaque.
How does tooth morphology affect restoration performance?
Irregular shapes complicate preparation, placement, and finishing.
What is the effect of dynamic functional forces on restorations?
They can induce stress fractures and material fatigue over time.
How do corrosive potentials in the oral environment influence failure?
Acidic conditions degrade metals, leading to discoloration and weakening.
Why is difficult access a challenge for restorative procedures?
Limited visibility and access compromise preparation, bonding, and finishing.
What is the primary approach to preventing restoration failure?
Proper diagnosis, treatment planning, and material selection.
How does a correct cavity design minimize failure risk?
Ensures optimal resistance, retention, and proper marginal integrity.
Why is meticulous material manipulation critical?
It prevents improper setting, voids, and dimensional instability.
What are key patient instructions to extend restoration longevity?
Maintain oral hygiene, avoid harmful habits, and attend regular check-ups.
How can fluoride application reduce the risk of caries recurrence?
Strengthens enamel and lowers the chances of demineralization.
Why is the use of a rubber dam recommended during restorative procedures?
It isolates the field, prevents moisture contamination, and ensures optimal bonding.
How do proper finishing and polishing prevent restoration failure?
They reduce plaque retention, improve esthetics, and enhance longevity.
What role does follow-up and monitoring play in managing restoration success?
Early detection of issues prevents complications and improves outcomes.
How can sensitivity and postoperative pain be managed after restoration?
Desensitizing agents, correct occlusion, and protective liners can help.
What steps are taken if a restoration exhibits marginal leakage?
Assess cause, replace or repair the restoration, and improve marginal sealing.
