Divergence correction associated with implant placement: a radiographic study

Area of Science:

• Dental Implantology
• Biomechanical Analysis
• Radiographic Evaluation

Background:

• Accurate angulation and alignment of dental implants are crucial for successful osseointegration and long-term function.
• Preinsertion surgical gauges are often used to predict and control implant placement angles.
• Variability in implant placement can arise from freehand techniques and anatomical considerations.

Purpose of the Study:

• To evaluate the accuracy of implant angulations and alignments compared to neighboring teeth and implants.
• To compare these measured angulations with those predicted by preinsertion surgical gauges.

Main Methods:

• Two hundred freehand dental implants were analyzed using panoramic radiography.
• Radiographs were taken with both a surgical gauge and the placed implant.
• Mesiodistal angular relationships were measured between gauges, implants, neighboring teeth, and the mandibular border.

Main Results:

• The mean discrepancy between gauge and implant angulation was -0.72 degrees.
• Maxillary implants showed greater divergence than mandibular implants (-9.89 vs -2.14 degrees).
• Implant location, adjacent teeth, and implant length significantly influenced angulation and alignment.

Conclusions:

• Adequate dental implant angular relationships can be achieved without surgical guides.
• Implant angulation is influenced by factors such as arch, side, site, and the presence of adjacent teeth.