Summary of Restorative Dentistry in Small Animals
Restorative Dentistry in Small Animals: A Student Guide
Introduction
Restorative dentistry in small animals focuses on diagnosing, repairing and replacing lost or damaged dental hard tissues to restore function, reduce pain and prevent infection. Procedures range from simple dentinal bonding to complex subgingival and endodontic-access restorations. Veterinary restorative work is primarily preventive and functional, though aesthetic results are often expected by owners.
Definition: Restorative dentistry — the branch of dentistry concerned with restoring the form, function and integrity of the tooth structure lost to disease, trauma or developmental defects.
Why perform restorations?
- Prevent pain and infection.
- Halt progression of hard tissue destruction.
- Restore chewing function and comfort (important for working dogs).
- Stimulate reparative dentine formation via odontotropic materials (e.g., Ca(OH)2, MTA) and fluoridation.
- Meet owner expectations for appearance.
Indications for restorations
- Trauma: acute fractures, chronic wear (attrition, abrasion), malocclusion-related damage, cage or play injuries.
- Developmental defects: enamel hypoplasia, hypocalcification.
- Caries: removal of infected dentine and restoration to prevent spread.
- Resorption lesions.
- Endodontic access: coronal sealing after treatment.
- Other applications: reshaping crowns, sealing developmental sulci, adhesive bracket placement, splinting, odontoplasty.
Definition: Attrition — tooth wear caused by tooth-to-tooth contact; Abrasion — wear caused by external mechanical actions (e.g., chewing hard objects).
Classification of cavities and defects (G.V. Black simplified)
| Class | Location / Description |
|---|---|
| I | Pits and fissures (occlusal) |
| II | Proximal surfaces of premolars and molars |
| III | Proximal surfaces of incisors/canines, not involving incisal edge |
| IV | Proximal surfaces involving incisal edge |
| V | Gingival third of the crown, not proximal (cervical) |
| VI | Incisal edge or cusp fractures |
Importance of radiography
- Always obtain radiographs for trauma, suspected pulpal involvement or to assess proximity of lesions to the pulp.
- Use at least two projections for proper assessment of depth and pulp exposure.
Materials and instruments — overview
- Rotary instruments: diamond and tungsten burs (round, pear, inverted cone, finishing) and finishing discs.
- Hand instruments: excavators, carriers, condensers/pluggers.
- Application tools: mixing spatulas, applicators, capsule dispensers, brushes.
- Light-curing units (LED), rubber dam systems, retraction cords.
- Protective measures: control light exposure, use personal PPE, follow instrument cleaning/disinfection protocols.
Definition: Smear layer — a 0.5–1.0 µm layer of debris produced during cutting of enamel/dentin that must be managed (removed or modified) before bonding.
Bases and liners
- Liner: thin material placed over exposed dentine to seal tubules, protect pulp and stimulate tertiary dentine (examples: Ca(OH)2, MTA).
- Base: thicker material placed on cavity floor to provide thermal insulation and absorb occlusal forces (examples: glass ionomer used as base).
Restorative materials (comparison table)
| Material | Advantages | Limitations | Typical uses |
|---|---|---|---|
| Glass ionomer (GI) | Chemical bond to dentin, fluoride release, good liner/base | Less wear resistance, poorer esthetics | Liner, base, class V, coronal seal after endo |
| Composite (packable/flowable) | Excellent esthetics, high wear resistance | Technique sensitive, polymerization shrinkage | Class I–IV restorations, veneers |
| Calcium hydroxide | Stimulates tertiary dentine, pulp protection | Weak mechanically | Liner for near-pulp exposures |
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Restorative Dentistry Basics
Klíčové pojmy: Restorations prevent pain, infection and further tooth destruction, Always obtain radiographs with at least two projections for trauma or deep lesions, Use liners (Ca(OH)2, MTA) near the pulp and bases (GI) for thermal protection, Glass ionomer bonds chemically to dentin, releases fluoride, but has lower wear resistance, Composite restorations require strict isolation, acid etch and incremental curing (1–2 mm), Seal dentinal tubules (bonding agents) to prevent sensitivity and marginal leakage, Respect biologic width (~2 mm) when restoring subgingival defects, Sandwich technique (GI base + composite) combines benefits of both materials, Use retraction cords and rubber dam for moisture control and margin access, Finish and polish restorations to reduce plaque retention and check occlusion