MDA Chapter 48-49 Flashcards

Esthetic Dentistry and Whitening Techniques

• Whitening techniques are a key aspect of esthetic dentistry.
• In-office treatments are the fastest and most efficient way to achieve tooth whitening.

Responsibilities of Dental Assistants

• Dental assistants are tasked with preparing, mixing, and transferring materials during restorative procedures.

Classifications of Restorations

• Class II restorations are primarily found in premolars and molars.
• A Class I restoration involves only one tooth surface, while a comprehensive Class II restoration may involve up to four surfaces.

Materials Used for Restorations

• Composite is the preferred material for Class III and Class IV preparations.
• Composite resin is a direct restorative dental material commonly used for Class II restorations.

Veneers and Tooth Preparation

• Veneers are applied to the facial surface of prepared teeth for esthetic enhancement.

Restoration Techniques and Tools

• A matrix system is critical for retaining filling material when proximal surfaces are removed during restorations.
• Mylar matrix systems are utilized during Class III and IV restorations to ensure correct contour and contact.

Class V Lesions and Temporary Restorations

• Class V lesions occur in the gingival third of the tooth structure.
• Temporary restorations, also known as intermediate restorations, are designed for short-term use.

Matrix Systems for Restorations

• The Tofflemire retainer and universal band is the most common matrix system for Class II posterior restorations.
• An AutoMatrix offers advantages over a universal system by eliminating the need for a retainer to secure the band.

Contouring and Positioning Techniques

• A burnisher or mirror handle end is required to contour a metal matrix band for posterior teeth effectively.
• The wedge is positioned lingually when placing a posterior restoration to ensure appropriate fit.

Potential Issues with Restorations

• Stainless steel matrix bands should not be used with composite resin due to concerns about scratching and setting issues.
• Improperly contoured restorations can lead to overhangs, which can compromise dental health.

Components of Universal Matrix Retainers

• The outer knob secures the matrix band in a universal matrix retainer, while the spindle also holds the band in place.
• The diagonal slot is a portion always facing the gingiva, ensuring proper alignment during placement.
• The inner knob is used to decrease the matrix band loop size after its placement on the tooth.
• The larger side of the universal matrix band loop should be directed towards the occlusal one-third of the tooth for optimal fit.