Table 1 Database search strategy

Pubmed

1. “Gutta-percha” [all fields] OR “Guttapercha” [all fields]

2. “AH-plus” [all fields] OR “Epoxy Resins” [all fields] OR “Resin Cements” [all fields] OR “epoxy resin-based root canal sealer” [all fields]

3. “Resilon” [all fields]

4. “tooth fracture” [all fields] OR “vertical fracture” [all fields] OR “fracture resistance” [all fields]

5. “english” [language]

6. (1 AND 2) OR 3

7. 4 AND 5 AND 6

Embase

#1. guttapercha OR ‘gutta percha’

#2. ‘ah plus’ OR (epoxy AND resins) OR (resin AND cements) OR (epoxy AND ‘resin based’ AND root AND canal AND sealer)

#3. Resilon

#4. (fracture AND resistance) OR (tooth AND fracture)

#5. ((# 1 AND # 2) OR # 3) AND # 4

Cochrane Library

1. MeSH Terms: Root Canal Obturation

2. MeSH Terms: Root Canal Filling Materials

3. MeSH Terms: Gutta-Percha

4. MeSH Terms: resilon sealer

5. MeSH Terms: Tooth Fractures

6. MeSH Terms: Dental Stress Analysis

7. KEY WORD: fracture resistance

8. (# 1 OR # 2 OR (# 3 AND # 4)) AND (# 5 OR # 6 OR # 7)

Web of Science

#1. TOPIC: (gutta-percha) OR TOPIC: (guttapercha)

#2. TOPIC: (AH-plus) OR TOPIC: (Epoxy Resins) OR TOPIC: (Resin Cements) OR TOPIC: (epoxy resin-based root canal sealer)

#3. TOPIC: (resilon)

#4. TOPIC: (tooth fracture) OR TOPIC: (vertical fracture) OR TOPIC: (fracture resistance)

#5. ((# 1 AND # 2) OR # 3) AND # 4

ScienceDirect

(((gutta-percha or guttapercha) AND ((AH-plus) OR ((Epoxy Resins)) OR ((Resin Cements)) OR ((epoxy resin-based root canal sealer)))) OR (resilon)) AND (((tooth fracture)) OR ((vertical fracture)) OR ((fracture resistance)))