HOSA Dental Terminology Practice

What type of matrix is commonly used on posterior teeth?

1. Celluloid strip

2. Stainless steel matrix

3. Plastic matrix

4. Wooden matrix

The correct answer is: Stainless steel matrix

The stainless steel matrix is commonly used on posterior teeth primarily due to its strength and durability. Posterior teeth are subject to significant biting forces and require a robust matrix to withstand these pressures during dental procedures, such as restorations. The stainless steel matrix provides excellent contouring capabilities, allowing for effective shaping of the restoration to match the natural anatomy of the tooth. In addition to its structural integrity, a stainless steel matrix typically allows for better adaptation to the tooth surface compared to other matrix types. This adaptability is important for achieving a tight seal, which contributes to the longevity and success of the dental restoration by minimizing the risk of contamination during the procedure. Other matrix types have specific applications but are less suited for posterior teeth. For instance, a celluloid strip is primarily used for anterior teeth where a more aesthetic approach is needed. Plastic matrices may also be adaptable, but they lack the strength needed for posterior restorations. Lastly, wooden matrices are rarely used in modern dentistry, particularly not for posterior teeth, due to their lack of durability and precision in adapting to the tooth structure.