Comparison of canal transportation and centering ability of
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According to this study, Optimum Glide Path (OGP) reciprocating motion provides a safer and efficient clinical approach compared to traditional manual motion in glide path establishment with small files in constricted canals.

The aim of this study by BMC Oral Health was to investigate and compare manual and OGP movement in terms of canal transportation and centering ability in glide path preparation of constricted canals.

Thirty constricted mesial root canals of mandibular molars, with initial apical size no larger than ISO#8, were selected and negotiated with #6–#8 K-files under the microscope. Canals were randomly divided into two experimental groups: Group 1: Glide path was established by using #10-#15 stainless steel K-files manually; Group 2: #10-#15 Mechanical Glide Path super-files were used with OGP motion. Each instrument was used to prepare only 2 canals. Canals were scanned before and after glide path preparation with micro-CT to evaluate root canal transportation and the centering ratio at 1, 3, and 5 mm levels from the root apex. File distortions and separations were recorded.

Group 2 showed a significantly lower transportation value than group 1 at 1-mm and 3-mm levels, however, the difference at 5-mm level was not significant. There was no significant difference regarding the centering ratio between the groups. Six #10 K-files were severely distorted in group 1, while no file separation or distortion was found in group 2.

Conclusively, OGP motion performed significantly less canal transportation (apical 3 mm) and file distortion during glide path establishment in constricted canals comparing to manual motion, while the centering ability between the two was similar.