a) Visible fracture lines within the enamel suggestive of craze

Figure 5 from Longitudinal tooth fractures: findings that

Revelation of microcracks as tooth structural element by X-ray

BROKEN TEETH: TRAUMA AND TREATMENT - Serene Dental

Craze lines in enamel are evident. Fig. 2. A fractured cusp is located

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Yunhan Sun's research works Shandong Academy of Sciences, Jinan and other places

Types of tooth fractures: causes, and treatments

Review of Cracked Tooth Syndrome: Etiology, Diagnosis, Management, and Prevention. - Abstract - Europe PMC

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Eui-Seok Lee's research works Korea University, Seoul (KU) and other places

Cracked Tooth Syndrome and Strategies for Restoring

Eui-Seok Lee's research works Korea University, Seoul (KU) and other places

How to tell if a tooth is cracked - Quora

Xingyu HOU, undergraduate, Taishan Medical University, Taishan, TSMC, Department of Medicine