
The Dr. Phil Klein Dental Podcast
Ep. 807 - Master the Social 6 with Injection Composite
What if you could deliver stunning anterior composite restorations in half the time it takes to freehand sculpt them — without relying on advanced artistic ability? This episode breaks down exactly how to do it. Dr. Mackenzie Kelly is a cosmetic dentist, educator, and adjunct faculty member at Indiana University School of Dentistry, where she graduated with highest distinction and received the American College of Prosthodontists award for excellence in crowns, bridges, restorative, and cosmetic procedures. She is currently pursuing accreditation through the American Academy of Cosmetic Dentistry — one of the most prestigious and rarely achieved designations in the field. With hundreds of hours of continuing education in minimal prep veneers, cosmetic bonding, clear aligners, and digital dentistry, Dr. Kelly brings both technical mastery and genuine artistic talent to every case. In this episode, Dr. Kelly provides a thorough clinical walkthrough of the injection composite technique — a digital workflow that uses a clear custom matrix fabricated from a diagnostic wax-up to guide composite placement and eliminate the need for freehand sculpting. She explains why this approach is applicable across nearly all anterior composite scenarios, how it compares to indirect porcelain restorations, and how proper case planning on the front end is the single most important factor in achieving consistent, beautiful outcomes. The conversation covers the full process from digital scan and CAD design through matrix fabrication, tooth preparation, isolation, injection protocol, and final finishing — with specific clinical tips at every step. Episode Highlights: The injection composite technique uses a clear matrix fabricated from a digital or analog diagnostic wax-up, with small injection ports pierced into the matrix through which composite is injected once the matrix is fully seated. Creating two separate matrix variants — one for every other tooth and one for all teeth — dramatically reduces interproximal cleanup and improves contour control, especially in multi-tooth cases like the social six. Tooth preparation for injection composite is performed entirely within enamel when possible, using air abrasion rather than a handpiece to achieve micro-surface preparation without structural reduction. After isolation with Teflon tape on alternating teeth, unprepped enamel is phosphoric acid etched for 30 to 60 seconds, followed by application of a universal self-etching bonding agent to ensure reliable adhesion even if small areas of dentin are inadvertently exposed. A high-filler-content composite — specifically one with approximately 91% filler loading in the packable formulation and approximately 81% in the flowable formulation — provides significantly greater strength and stain resistance compared to conventional composites, which typically contain filler content in the 60 to 70 percent range for flowables. Higher filler content reduces the resin component responsible for polymerization shrinkage and staining, supporting long-term durability of direct anterior restorations. A partial cure of approximately 10 seconds before removing the clear matrix allows the composite to reach sufficient rigidity for matrix removal while remaining manageable for flash cleanup. A sharp scalpel blade is used immediately after matrix removal to trim excess composite at the gingival and interproximal margins before completing the final cure — this technique minimizes finishing time and reduces the risk of over-contouring. Executing a provisional mock-up using a putty matrix and a bisacryl provisional material before any etching or preparation allows the clinician to verify tooth length, proportion, and shade masking in the patient's face under natural conditions. This critical step also helps identify whether darker underlying tooth structure will require a more opaque composite selection, and provides a reversible checkpoint for patient approval before any irreversible clinical steps are taken. Perfect for: General dentists looking to expand their direct aesthetic composite capabilities, cosmetic dentistry enthusiasts at any career stage, dental residents building confidence with anterior restorations, and any clinician interested in integrating digital workflows into their cosmetic dentistry practice. If anterior composite cases have been a source of stress or hesitation in your practice, this episode gives you a concrete, step-by-step protocol to change that starting with your very next case.

