Materials and techniques for restoring contacts in class II composites

This course describes the materials used for matrices in class II composites and the wedges and rings used to adapt sectional matrix bands and provide tooth separation.

3 CE Credits

A peer-reviewed course written by Nathanial C. Lawson, DMD, PhD


The goal of this course is to describe the materials used for matrices in class II composites and the wedges and rings used to adapt sectional matrix bands and provide tooth separation. Different matrix bands (sectional and circumferential), wedges (wooden, plastic, solid, hollow), and rings will be described. This review will summarize advantages and disadvantages of various options for this armamentarium. Additionally, several clinical applications of PTFE tape for class II restorations will be described. Finally, techniques for matrix placement in difficult clinical scenarios will be discussed.

“Materials and techniques for restoring contacts in class II composites” Educational objectives

  • Describe the different types of sectional matrix bands
  • Differentiate between solid and hollow wedges and learn how to use them
  • Identify different types of separating rings and their separation force
  • Learn tricks for using PTFE tape while placing a matrix

Nathaniel Lawson, DMD, PhD, is the director of the Division of Biomaterials at the University of Alabama at Birmingham School of Dentistry and the program director of the biomaterials residency program. He has published extensively on the topics of mechanical, optical, and biologic properties of dental materials and clinical evaluation of new dental materials. He lectures on clinical applications for modern dental materials and works as a general dentist in the UAB Faculty Practice.

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Course Includes

  • 8 Lessons
  • 1 Test
  • Course Certificate
  • CE credit(s): 3

    Course Type: Written

    Published Date: February 2022

    This continuing education (CE) activity was developed by Endeavor Business Media with no commercial support.

    This course was written for dentists, dental hygienists, and dental assistants, from novice to skilled.

    Educational methods: This course is a self-instructional journal and web activity.

    Provider disclosure: Endeavor Business Media neither has a leadership position nor a commercial interest in any products or services discussed or shared in this educational activity. No manufacturer or third party had any input in the development of the course content.

    Requirements for successful completion: To obtain 3 CE credits for this educational activity, you must pay the required fee, review the material, complete the course evaluation, and obtain an exam score of 70% or higher.

    CE planner disclosure: Laura Winfield, Endeavor Business Media dental group CE coordinator, neither has a leadership nor commercial interest with the products or services discussed in this educational activity. Ms. Winfield can be reached at

    Educational disclaimer: Completing a single continuing education course does not provide enough information to result in the participant being an expert in the field related to the course topic. It is a combination of many educational courses and clinical experience that allows the participant to develop skills and expertise.

    Image authenticity statement: The images in this educational activity have not been altered.

    Scientific integrity statement: Information shared in this CE course is developed from clinical research and represents the most current information available from evidence-based dentistry.

    Known benefits and limitations of the data: The information presented in this educational activity is derived from the data and information contained in the reference section.

    Registration: The cost of this CE course is $39.00 for 3 CE credits.

    Cancellation and refund policy: Any participant who is not 100% satisfied with this course can request a full refund by contacting Endeavor Business Media in writing.

    Provider information:

    Dental Board of California: Provider RP5933. Course registration number CA code: 03-5933-22001. Expires January 2025. “This course meets the Dental Board of California’s requirements for 3 units of continuing education.”


    Endeavor Business Media is a nationally approved PACE program provider for FAGD/MAGD credit.
    Approval does not imply acceptance by any regulatory authority or AGD endorsement.
    11/1/2022 to 10/31/2024.
    Provider ID# 320452
    AGD code: 250


    Endeavor Business Media is designated as an approved Provider by the American Academy of Dental Hygiene, Inc. #AADHPNW (January 1, 2022–December 31, 2024). Approval does not imply acceptance by a state or provincial Board of Dentistry. Licensee should maintain this document in the event of an audit. AADH code:


    Endeavor Business Media is an ADA CERP–recognized provider.

    ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providers of dental continuing education. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry.

    Concerns or complaints about a CE provider may be directed to the provider or to CERP at



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