Comparative analysis of pericervical dentin reduction using three rotary file systems: A micro-computed tomography...

Area of Science:

• Endodontics
• Dental Materials Science
• Restorative Dentistry

Background:

• Pericervical dentin (PCD) thickness is vital for the long-term success of endodontically treated teeth.
• Root fractures are associated with PCD loss, influenced by rotary file system choice.

Purpose of the Study:

• To compare the impact of TruNatomy, OneShape, and ProTaper Gold rotary file systems on PCD thickness.
• To evaluate dentin preservation in the mesiobuccal root of mandibular molars.

Main Methods:

• Micro-computed tomography (micro-CT) was used to assess PCD thickness before and after instrumentation.
• Mandibular molars were instrumented using three different rotary file systems.
• PCD thickness was measured at 2 mm and 4 mm below the cementoenamel junction (CEJ).

Main Results:

• TruNatomy demonstrated significantly less dentin removal at 2 mm below the CEJ (P = 0.003).
• No significant differences in dentin thickness were found at 4 mm below the CEJ among the groups.

Conclusions:

• TruNatomy preserved the most pericervical dentin, followed by ProTaper Gold and OneShape.
• Appropriate selection of rotary instruments can minimize dentin loss, enhancing the longevity of endodontically treated teeth.