Detecting cracks in teeth is a long-standing clinical challenge. Patients may complain of diffuse pain on chewing, pain, at times, on temperature change and pain that occurs episodically. Common diagnostic tools such as radiographs and visual examination may not detect cracks. This clinical case study shows how photothermal radiometry and luminescence (PTR-LUM), technology behind the Canary Dental Caries Detection System can detect and monitor cracks clinically as well as quantify the extent of crack. This important clinical feature is not yet available with other caries detection clinical devices. In this clinical situation, the cracks involved a large part of the mesial and distal of a mandibular second molar and the adjacent first molar. It led to a diagnosis of parafunction and placement of a mandibular flat plane bite splint along with the placement of composite restorations to restore the fractures. The science behind the point scan lock-in signal processing results of PTR-LUM technology implemented in The Canary System to clinically detect visible cracks or cracks beneath the enamel surface as well as caries on all tooth surfaces and around restorations is discussed. Amplitude and phase results from PTR-LUM point scans are incorporated into a Canary number output developed for oral health providers and are disclosed for the first time in detail with clinical evidence.
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