Adaptation of threaded dowels to dentin

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Threaded dowels are used for post-endodontic restoration.
• Their adaptation and potential for causing root stress are critical considerations.

Purpose of the Study:

• To evaluate the adaptation of threaded dowels in root canals.
• To assess the risk of lateral stresses and root fracture associated with different dowel types.
• To identify methods for minimizing dowel-related complications.

Main Methods:

• Analysis of threaded dowel adaptation in the cervical and apical thirds of root canals.
• Evaluation of stress distribution and fracture potential for three types of dowels.
• Comparison of matched reamers and dowels versus unmatched systems.
• Assessment of the Kurer Anchor system's performance.

Main Results:

• Dowel adaptation varied, being minimal in the cervical third and maximal in the apical third.
• All three dowel types posed a risk of lateral stresses and potential fracture.
• Matched reamers and dowels significantly reduced the danger of fracture.
• Smaller-diameter dowels minimized dentin contact, thus avoiding root weakening.
• The Kurer Anchor system demonstrated a satisfactory combination of nonlateral residual stresses.

Conclusions:

• Dowel selection and matching with reamers are crucial for preventing root fracture.
• Smaller dowel diameters and systems like the Kurer Anchor offer improved root protection.
• Minimizing lateral stresses is key to successful post-endodontic treatment.