Radiology 7:3D Imaging in Dentistry

3D Imaging in Dentistry

  • Presented by Shaza Mardini DDS, MS, Dip. ABOMR

  • Focus on Oral & Maxillofacial Radiology

History of 3D in Dentistry

  • Pre-2000 Era

    • 3D imaging was primarily restricted to medical CT (Computed Tomography) and MRI (Magnetic Resonance Imaging).

    • Utilized mainly in oral surgery applications or cases involving major pathology.

    • Concerns with medical CT include:

    • High radiation dose associated with CT scans.

    • High costs of MRI and limited utility primarily for soft tissue imaging.

Importance of 3D in Dentistry

  • Key Benefits:

    • Accuracy: Superior precision in dental evaluations and treatment planning.

    • Enhanced Visualization:

    • Ability to visualize anatomy across all dimensions, improving diagnostic capabilities.

    • Improved Diagnosis:

    • More detailed anatomical insight leading to better patient outcomes.

3D vs. 2D Imaging

  • Advantages of 3D Imaging Compared to 2D:

    • One Scan, Multiple Images:

    • A single scan produces multiple image perspectives of the same region.

    • 1:1 Measurement:

    • Allows accurate measurements without the distortions typically found in 2D images.

    • Third Dimension:

    • Facilitates identifying anatomical obstacles and improving diagnostic accuracy.

    • Countering Myths:

    • CBCT (Cone Beam Computed Tomography) is a relatively new technology; however, it's essential for contemporary dental practices.

    • Addresses misconceptions regarding unnecessary information and workflow disruptions.

    • Patient acceptance of 3D scans is increasing as awareness and familiarity grow.

Challenges Associated with 3D Imaging

  • True Obstacles to Implementing 3D Imaging:

    • Initial Cost:

    • High startup expenses for acquiring CBCT technology.

    • Learning Curve:

    • Requires training in scanning techniques and understanding protocols.

    • Workflow Integration:

    • Need to establish streamlined workflows to incorporate scanning into practice utilization effectively.

    • Responsibility for Scan Interpretations:

    • Clinicians must be prepared for the interpretation of the scans, adding a layer of responsibility.

    • Patient Movement:

    • Motion artifacts during scanning can compromise image quality.

    • Artifacts:

    • Increased artifacts may occur which can complicate the reading of images.

3D Imaging Characteristics

  • Dimensional Imaging:

    • 2-Dimensional Imaging was the norm before advancements in 3D technologies.

  • Comparison to Traditional Imaging Techniques:

    • Traditional 2-dimensional cephalometry lacks the detailed insights provided by 3D approaches as highlighted by studies like Gregory L. Adams et al.

    • Measured differences noted between traditional physical calipers and newer 3D sculpting techniques.

Intraoral Imaging Benefits

  • Advantageous for Bone Detail:

    • Highly effective for visualizing bone specifics during procedures such as implants.

    • Limitations noted include the inability to provide specifics on width, height, trajectory angulation, and location of critical structures such as:

    • Mandibular canal

    • Maxillary sinus

Panoramic Imaging Overview

  • Functions as a Screening Tool:

    • Evaluates the overall health of dental structures, with inherent challenges like distortion, magnification, ghost images, and superimposition.

Cephalometric Imaging

  • Utility in Orthodontics:

    • Primarily used for assessing skeletal relationships and diagnosing orthodontic conditions.

  • Common Limitations:

    • Known issues with superimposition and magnification distortions that can affect treatment planning.

Volumetric Imaging (CBCT)

  • Technological Overview:

    • Computed Tomography provides true 3D imaging capabilities crucial in both dentistry and medicine.

    • CBCT Developments:

    • Introduction of devices such as the 3D Accuitomo 170, designed to enhance field of view (FOV) and image quality.

CBCT Field of View (FOV)

  • FOV Specifications:

    • Ranges from various dimensions (e.g., 8 cm x 8 cm, up to larger sizes).

    • Specific applications dependent on FOV size including:

    • Imaging for general dentistry, orthodontics, and surgical guides.

    • Determining optimal size for capturing specific areas such as sinuses, TMJ, or dental arches.

Voxel Representation in CBCT

  • Understanding Voxels:

    • Voxel represents the smallest volume element in 3D imaging; contributes to shades of gray that provide diagnostic insights.

    • Importance of Voxel Size:

    • Smaller voxel sizes correspond to better resolution in imaging.

Dose Considerations in 3D Imaging

  • Effective Dose:

    • Used to assess risks associated with radiologic exposure; varies between imaging types with measurements in Sieverts (Sv), Millisieverts (mSv), and Microsieverts (μSv).

  • Background Radiation Data:

    • Statistical insights indicate an average radiation dose from CBCT is considerably lower than conventional CT; typically ranges between 84-212 μSv for medium FOV.

Imaging Quality

  • Quality Metrics:

    • Includes detailing around voxel size resolution, imaging time duration, and achieved shades of gray.

    • The balance must be struck between lowest dose and highest resolution output for optimal imaging.

Clinical Applications of CBCT

  • Versatile Utilization:

    • Assessment of structures in three dimensions for pathology, bone evaluation, endodontic assessments, and implant planning.

    • Broader tasks include 3D modeling or printing, surgical guide creation, orthodontic planning, and airway analysis.

Conclusion and Implications

  • Future Directions:

    • The significance of 3D imaging in dental and facial structural analyses is undeniable; has proven to be a cornerstone in modern dental practices.

  • Takeaways:

    • Provides invaluable insights into areas typically superimposed in traditional imaging.

    • Enables measurement of bone and airway structures while maintaining lower exposure risk than MDCT (Multi-slice CT).

Questions?

  • Audience invited for questions and clarifications post-presentation.