•Purpose: to document and analyze macro- and microfindings detected with endoscopic inspection at the cut root face after root-end resection during apical surgery.
•n: 138 teeth with 168 treated roots in 114 patients undergoing apical surgery.
•Roots were resected approximately 3 mm from apex. Staining of the area with methylene blue, the cut root face was inspected using a rigid endoscope.
•The following primary study parameters were assessed:
Macrofindings: number of canals\root and presence of isthmus per root. Microfindings: presence and location of a craze line, crack, gap & frosted dentine Fig.1.
•Microfindings were correlated with secondary study parameters, i.e. age, tooth type & presence/absence of post.
Most highlighted Results:
1. The teeth most often included were mandibular first molars with M root most frequently assessed.
2.The overall presence of an isthmus in posterior teeth including all premolar & molar roots was 44% (highest frequency seen in M roots of mandibular 1st molars 88.5%)
3.Overall, (9.5%) had a craze line or crack majority were located in B segment
4.Frosted dentine was observed in 80% of roots most often in B segment . 5.Gaps were found in 83.3% mostly found in the B segment.
6.The age groups and the presence or absence of a post/screw did not sig influence the findings.
7.Roots of premolars had sig more craze lines/ cracks than anteriors & molars. With regard to frosted dentine, roots of premolars & molars were sig more frequently affected than of anteriors.
Multiple canals per root were mainly found in premolars and molars, but not exclusively. Mesial roots of mandibular first molars had the highest frequency of a canal isthmus. ‘gap’ was the most frequently seen anomaly cracks and craze line were infrequent findings.