# Cervical Lesions: Choosing the Material

> Material choice for cervical lesions for BDS Operative Dentistry — NCCL aetiology, GIC versus composite, bevel rules and sclerotic dentine bonding.

- Canonical URL: https://prepelephant.com/topics/bds/operative-dentistry/cervical-lesions-choice-material
- Exam / course: BDS · Subject: Operative Dentistry
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Cervical Lesions: Choosing the Material", PrepElephant, https://prepelephant.com/topics/bds/operative-dentistry/cervical-lesions-choice-material

## Direct answer

Two cervical defects that look identical can deserve entirely different materials, because the choice follows aetiology, location and moisture control. Non-carious cervical lesions — the wedges of abfraction, abrasion and erosion — are treated on sensitivity, depth and position: shallow sensitive lesions get desensitising adhesive treatment alone, root-surface and moisture-difficult lesions get glass ionomer, and aesthetic or load-bearing cervical margins get composite. Carious Class V lesions follow the same logic with the caries risk added. The technical rules that decide success are three: bevel enamel only, never cementum; respect how sclerotic dentine resists bonding; and treat the cause — an unfixed occlusal habit or abrasive brushing returns every restoration.

## What you must remember

- **Aetiology triad (viva favourite):** abrasion (mechanical, hard brushing with notched defects and recession), erosion (chemical, dietary or gastric acid with shallow cupping), and abfraction (occlusal stress flexure at the cervical fulcrum) — one defect often combines all three.
- **Sensitivity-first option:** a shallow lesion whose only complaint is sharp pain to cold and touch may need no restoration — dentine adhesives and desensitising agents (glutaraldehyde-HEMA, fluoride varnishes, potassium salts) occlude tubules.
- **GIC's claim:** chemical bond to cementum and dentine via carboxyl-calcium chelation, fluoride release, and setting tolerance to moisture — the material of choice for root-surface lesions and moisture-difficult fields.
- **Composite's claim:** superior aesthetics and wear resistance for visible or function-loaded cervical margins, demanding dry isolation and proper conditioning of both enamel and dentine.
- **Bevel rule:** bevel the enamel margin (about 0.25-0.5 mm) to widen the prism ends for etching; never bevel cementum, which lacks prisms and gains nothing from a bevel.
- **Sclerotic dentine problem:** hypermineralised, acid-resistant tubules bond poorly — extended etching, air abrasion or roughening, and sometimes glass ionomer's chemical bond succeed where a simple etch-and-rinse adhesive fails.
- **Cause management:** occlusal equilibration or a night guard for abfraction, a brushing-technique correction for abrasion, and dietary or reflux advice for erosion — without which restoration failure recurs.

## Choosing materials across three cervical lesions

A 45-year-old presents with three cervical problems. First, a shallow wedge defect on 24 with sharp sensitivity to the air test and no cavitation — the answer is no restoration: etch-and-rinse adhesive or a dedicated desensitiser is applied, the brushing habit is corrected to a soft brush and sulcular technique, and the lesion is reviewed. Second, a deep notch on 36 below the gingival margin where rubber dam isolation will be imperfect and the base is root dentine: resin-modified glass ionomer, placed without bevel, fluoride-releasing, forgiving of the marginal seepage that composite cannot survive there. Third, a broad defect on the upper canine visible in the smile, margin partly on enamel: composite, with the enamel edge bevelled for etching, the sclerotic floor roughened with a diamond and given a longer etch, layered in two shades for cervical depth. Each choice is written with its reason in the notes — sensitivity treated conservatively, GIC where moisture and substrate demand it, composite where aesthetics and isolation allow — because the examiner's follow-up question is never "what did you use?" but "why not the other one?".

## Where students slip

The reflex error is restoring every NCCL: a shallow, sensitive notch treated with a restoration manages the symptom and ignores the cause, and the defect often recurs beside or beneath the filling within a few years. The viva trap is the bevel question — students bevel everything, and the marks go to whoever states that cementum gains nothing from bevel because it is non-prismatic. Another standard confusion is sclerotic dentine: "etch and bond" fails silently on hypermineralised surfaces, and the expected escalation is roughening with a bur or air abrasion, prolonged etching, or a glass ionomer's chemical bond. The aetiology question rounds out the vivas — distinguishing abrasion's notched, brush-driven defect from erosion's cupped one is a two-mark staple.

## Frequently asked questions

### Why is glass ionomer preferred for root-surface cervical lesions?

It bonds chemically to cementum and dentine, releases fluoride, and tolerates the marginal moisture that cervical restorations rarely escape.

### When is a non-carious cervical lesion treated without restoration?

When the lesion is shallow and the complaint is only sensitivity — tubule-occluding adhesives and desensitising agents treat the symptom while the cause is corrected.

### Which margins should be bevelled in Class V preparations?

Only enamel margins, bevelled about 0.25-0.5 mm to expose prism ends for etching; cementum margins are left unbevelled as cementum is non-prismatic.

### Why does bonding to sclerotic dentine fail predictably?

Hypermineralised, acid-resistant tubules prevent proper hybrid layer formation, so roughening, extended etching or chemically bonding glass ionomer is used instead.

### How do abrasion, erosion and abfraction differ clinically?

Abrasion notches correlate with traumatic brushing, erosion cups correlate with acid exposure, and abfraction wedges correlate with occlusal stress — often combined in one lesion.