Black and White of Pediatric Dentistry

Introduction

Silver diamine fluoride (SDF) and Zirconia crowns are widely used in pediatric dentistry. The use of SDF renders the teeth black and Zirconia is widely accepted as tooth coloured material crown. In this article, we will be discussing about both these less-talked-about aspects of pediatric dentistry.

Silver diamine fluoride (SDF)

It is a colourless topical agent, first developed in the 1960s in Nishino, Japan. The fluoride content in SDF is 44,800 ppm maintaining the pH of 10.

Composition of SDF

SDF solutions contain ammonia, silver, and fluoride. The fluoride content in SDF solutions varies from brand to brand. SDF is a colourless topical agent (38% w/v Ag(NH3)2F, 30% w/w) comprised of 24.4–28.8% (w/v) silver and 5.0–5.9% fluoride, at pH 10, and marketed most commonly as Advantage Arrest by Elevate Oral Care LLC, West Palm Beach, Florida, USA. The composition may vary depending on the brands and the manufacturers. Table 1 presents some of the brands of SDF available.

Mechanism of action of SDF

The SDF reacts with hydroxyapatite, resulting in silver phosphate and calcium fluoride, which forms a reservoir of fluoride and phosphate ions promoting remineralisation. The silver ions penetrate the lesions and remain there to exert their influence (25–30 microns into the enamel, 200–300 microns into the dentin, and up to 2 mm into a deep carious lesion). The presence of silver compounds such as silver oxide and silver phosphate leads to black staining of the carious lesions.

Indications of SDF

High caries risk

• Behavioural or medical management challenges
• Multiple lesions - not all can be treated in one visit
• In carious lesions that are difficult to treat
• Without access to or with difficulty accessing dental care

Tooth selection

• Absence of clinical signs related to inflamed pulp or history of spontaneous pain
• Carious lesions that are not infringing on to the pulp - on radiographs
• Carious lesions on any surface that are accessible with a brush during SDF application
• Before placement of restoration as a cariostatic means

Other uses

• Hypersentivity
• Treatment of infected root canals (1:10 dilution)
• Strengthen endodontically treated teeth (laser=sdf)
• Treatment of molar incisor hypomineralization (MIH)
• Treatment of recurrent caries (secondary caries)
• Indirect pulp treatment (IPT)
• Arresting caries to maintain the teeth nearing exfoliation
• As a substitute to sealants

Contraindication of SDF

• Silver allergy
• Relative contraindications: desquamative gingivitis or mucositis

Precautions with SDF

• Contact with soft tissue should be avoided since the material may produce transient gingivitis or black discolouration
• Rubber dam or cotton rolls should be used
• Coat the gingival tissue with petroleum jelly

Procedure of SDF application

1. Protect gingiva and mucosa using petroleum
2. Isolate and dry the area
3. Apply SDF using micro-brush
4. For proximal decay use super floss application
5. Allow to soak for 1-3 minutes