Revised, Computed Tomography-Based Lekholm and Zarb Jawbone Quality Classification.

Area of Science:

• Oral and Maxillofacial Surgery
• Radiology
• Biomaterials Science

Background:

• The Lekholm and Zarb classification is crucial for assessing bone quality in dental implantology.
• Existing classifications may not encompass all variations of compact and trabecular bone density.
• Improved classification accuracy is needed for predictable surgical outcomes.

Purpose of the Study:

• To propose a revised Lekholm and Zarb classification incorporating all compact and trabecular bone combinations.
• To establish guidelines for enhancing the reproducibility of this bone density classification.
• To validate the revised classification using computed tomography (CT) imaging.

Main Methods:

• Three new subclasses (2b, 2c, 3b) were defined based on varying layers of compact and trabecular bone.
• Interpretation guidelines were developed to standardize classification procedures.
• Experienced examiners underwent training and classified CT images of edentulous jaws twice, with a minimum one-week interval.

Main Results:

• The revised classification demonstrated high intra-observer agreement among examiners.
• Kappa statistics for intra-observer agreement ranged from 0.835 to 0.919 (P < .001).
• The results indicate excellent reliability in classifying bone types.

Conclusions:

• The revised CT-based Lekholm and Zarb classification shows high reproducibility.
• The updated system effectively distinguishes between diverse combinations of compact and trabecular bone.
• This revised classification offers a more precise tool for pre-surgical assessment in dental implantology.