SAVE THE DATE!

Anatomical Landmarks Of The Edentulous Arches

MAXILLARY ARCHMAXILLARY ARCH

MANDIBULAR ARCHMANDIBULAR ARCHWhen taking your

impressions and bite

records, please be sure to

capture anatomical

landmarks. Mark the

midline, high lip line,

cuspid eminence and

contour the rim.

As our Laboratory continues to grow, we are thankful for all of our clients that have placed their trust and confidence in us over the years! We are honored to be part of your restorative team!

UPCOMING EVENTS

No Triad Spear Study Club

JANUARY

FEBRUARY

MARCH

February 12th

• Triad’s Spear Study Club

March 11th

• Triad’s Spear Study Club

February 20th – 22nd • CAL Lab Meeting and LMT Day Chicago, Illinois

January 18th-20th

• Vision 21 Meeting Las Vegas, Nevada

We are always posting Dental Industry relevant content, updates about our laboratory, and case photos! Make sure you follow us on any of these social media channels!

@TriadDentalStudio

January 1st

• New Years Day Lab will be closed.

March 20th

• Nobel Biocare Seminar “The Edge Effect” Featuring Dr. Mike Meek Sedgefield Country Club, Greensboro, NC

March 26th

• All-On-4 Dental Implant And The Immediate Conversion Seminar Featuring Dr. Christopher Durham

The Oral Surgery Institute of the Carolina Greensboro, NC

WINTER 2020 NEWSLETTERWINTER 2020 NEWSLETTER

IN THIS EDITION

• Anatomical Landmarks of the Edentulous Arches

• Options for Improving Clinical Efficiency When Fabricating New Removable Complete Dentures

• Upcoming Events

• Laboratory News

SAVE THE DATE!

“The Edge Effect”Collaborative WorkflowThrough DTX Studio for Ultimate Outcomes in the Referral Model

Pre-registration is required. Please RSVP to Blair at Triad Dental Studio

(336) 812-8707 blair@triaddentalstudio.com

707 Sunshine Way • Greensboro, NC 27409 • (336) 812-8707 • (800) 318-6684 • Fax: (336) 812-9656 YourPartner@TriadDentalStudio.com • www.TriadDentalStudio.com

On December 6th, Triad participated in an X-Guide event hosted by Nobel Biocare at GIA in Greensboro. Technology is rapidly changing in our industry. If you place implants, this is a must-see device. www.x-navtech.com/x-guide/

LABORATORY NEWS

The Triad Team was a vendor at Triad Oral Surgery’s Event “Street Drugs Exposed” on December 13th. This CE event was presented by Dr. Harold Crossley. There were over 200 attendees. It was great to see several of our Doctors! Hope to see you at future events!

Presented by Dr. Mike Meek Sedgefield Country Club Greensboro, NC

Receive 6 CEU’s!Tuition is complimentary!

March 20th 2020

8AM - 2PM

Options for Improving Clinical Efficiency When Fabricating New Options for Improving Clinical Efficiency When Fabricating New Removable Complete DenturesRemovable Complete DenturesBy Darin Dichter on October 28, 2019

There are several approaches to fabricating conventional complete

removable dentures. The classic approach typically involves at least

five separate clinical appointments that are separated by the time

required to complete the necessary laboratory work.

The classic approach has proven to provide predictable outcomes for most edentulous patients and their dentist/technician team. While it is absolutely necessary for some pa-tients, the classic approach also has the disadvantage of requiring significant treatment time. Several techniques have been proposed to shorten the time required to fabricate a new set of dentures. Unfortunately, some of these approaches are shortcuts that come with the significant risk of an unpredictable outcome.

As an example, some authors propose eliminating the trial denture appointment to eliminate chair time from the fabrication process. While true, this would save one appointment compared to the classic approach, the risk is an unpredictable esthetic or functional outcome. Skipping the try-in appointment means neither clinician nor patient would have the opportunity to critically evaluate things like tooth position, tooth arrange-ment, tooth color, occlusal vertical dimension or the occlusal contacts.

The risk to the clinician is that if any of these elements needs to be changed, significantly more time will now be required to re-do several steps. Certainly, this is an obvious exam-ple, but the bottom line is that when the time to manage error is factored into treatment time, unpredictable outcomes tend to increase treatment time rather than decrease it. With that in mind, any approach clinicians seek to improve efficiency should provide a patient outcome as good or better than the traditional approach.

Improving Clinical Efficiency Through Shortened Treatment TimeOne of the easiest methods for improving efficiency involves the impression – or, rather, the trays being utilized for the definitive impression. According to the classic approach, a preliminary impression would be made to fabricate a preliminary cast. That cast is subsequently used to fabricate the custom tray used with the definitive impression. While predictable, this approach comes at the cost of essentially two clinical appointments to make the definitive impression. The patient in Figure 2 presented with a hopeless dentition. Rather than proceed with an immediate denture approach, this patient preferred to have the remaining teeth removed and began the denture fabrication following initial healing. In order to fabricate removable complete dentures for the now edentulous patient, custom trays were fabricated following the classic technique: preliminary impres-sion, preliminary cast and definitive impression utilizing custom trays. The time-consum-ing sequence for tray fabrication is summarized in Figure 3.

Figure 2: This patient has a hopeless dentition. In this case the transitional dentures will be fabricated in a delayed approach. The patient will be edentulated and the denture fabrication will begin following initial healing.

Figure 3: In the case of the patient above, preliminary impressions are made following initial healing. Custom impression trays are fabricated on the preliminary casts.

An alternative to the custom tray fabrication demonstrated in the case above would be to use a stock tray that allows for customization. Figures 4 and 5 show two stock (pre-man-ufactured) edentulous impression trays. What makes these trays special is the ability to customize the shape by heating the material. Once the tray material is chilled, the changes to the tray form are preserved. Customizing the trays allows for border molding and defini-tive impression making in a way similar to using an entirely custom tray.

The primary advantage to using a customizable tray is combining the first two clinical appointments of the classic approach into a single definitive impression appointment and, as a result, going from five clinical appointments to four without compromise to the overall outcome of the case.

Additional Options For Definitive Edentulous Impression TraysIf the patient has existing dentures, the “old” dentures can be quite useful in the fabrication of a new denture or set of dentures. One option for exploiting the existing dentures is to use the actual dentures as the impression tray. If the dentures fit reasonably well, a wash impression could be made inside the existing denture. However, there are two problems with this approach.

The first problem is the time involved to pour and articulate the case means the patient may be without their dentures for several hours (or longer if the case is going to the dental laboratory).

The second problem exists if the denture does not fit well, particularly if it is over-extend-ed. The only way to avoid propagating the over-extension into the impression would mean altering the existing denture by reducing the extension. Permanently altering the patient’s existing denture puts the clinician at significant risk should problems develop in the future. Clinicians can avoid those problems entirely by copying or duplicating the existing dentures. The duplicate denture can be used as the custom impression tray for the definitive impres-sion and, because it is a duplicate, the denture flange or any other part of the denture can be altered without fear.

Duplicating the existing denture requires some additional effort and yet the improvement in efficiency is significant. In the previous techniques the preliminary impression appointment was unnecessary, resulting in reducing the total number of appointments from five to four. With duplicate dentures the number of clinical appointments can be reduced further by tak-ing advantage of the teeth being present. Having the tooth position recorded in the duplicate

Primary Impression

Conventional Denture

Trial Denture

Physiologic Impression Records

Conventional Dentures Workflow For Analog Impressions ---------------------------------------------------------------------------------

Figure 4: Stock trays that are customizable for the patient can yield excellent quality impressions. In this case, Massad trays from Nobilium.

Figure 5: The Wagner Tray - another option for customizable edentulous impression trays.

Figure 6: In this case, the existing dentures were duplicated digitally. The duplicates served as custom trays, capturing the patient’s anatomic information while also allowing for recording functional and esthetic information like initial tooth position, lip support, facebow transfer and jaw relation records. The result is three clinical appointments potentially combined into one.

Methods For Duplicating Removable Complete DenturesThere are several options for duplicating complete dentures. Generally, the techniques could be broken down into analog approaches and digital approaches.

Figure 7: Analog approaches to denture duplication. Alginate has the advantage of cost savings. Silicone lab putty has the advantage of dimensional stability over time so different materials could be used for the teeth and the base as well as production of multiple duplicates.

Figure 8: Digital options for denture duplication. The best option for your practice is determined by the technology available.

What If I Can’t Duplicate The Dentures?Despite the advantages that a duplicate denture impression technique provides, there may be times when the duplication process is either not available or not practical. In those cases, the existing denture can still provide value for the clinician seeking to shorten time to the definitive denture.

Laboratory putty or impression silicone can be used to make a cast from the existing denture. The silicone cast is flexible enough to be separated from the existing denture with minimal risk from damaging the denture base. While flexible, the silicone case is firm enough to fabricate the custom impression tray without distortion. As with the denture duplication, this process is reasonable to delegate to a trained team member.

Bottom line: clinical efficiency is important with any procedure. Unantici-

pated clinical appointments negatively impact clinical efficiency and, as a

result, reduce potential profits and our overall satisfaction with a case. The

techniques here are realistic options to help maximize clinical efficiency

without sacrificing the patient outcome.

denture/custom tray allows the clinician to evaluate and modify both esthetic and function details. Once the impressions have been made, the clinician can evaluate lip support and tooth position. Changes can be made directly to the duplicate denture and then transferred to the technician both physically and through photographs The occlusal vertical dimension can be evaluated and altered if necessary, then interocclusal records can be made. The effort to duplicate the dentures paysMethods For Duplicating Removable Complete Dentures

Having the tooth position recorded in the duplicate denture/custom tray allows the clinician to evaluate and modify both esthetic and function details. Once the impressions have been made, the clinician can evaluate lip support and tooth position. Changes can be made directly to the duplicate denture and then transferred to the technician both physically and through photographs The occlusal vertical dimension can be evaluated and altered if necessary, then interocclusal records can be made. The effort to duplicate the dentures pays off by allowing all the procedures that typically happen and the third appointment to be performed in the same clinical appointment in which the definitive impressions are made.

Figure 9: In this case, the existing denture was not duplicated but it was still valuable. A laboratory putty cast was made from the denture and a light-cured custom impression tray was fabricated on the cast, which saved the clinician and the patient from the preliminary impression appointment.

With analog duplication techniques, alginate or lab putty is used with a flask to capture the three-dimensional contours of the denture. When the alginate or lab putty has set, the denture is removed and the void filled with an autopolymerizing resin.

Digital approaches to denture duplication involve scanning the denture with a chairside scanner, lab scanner or CBCT. The resulting file can then be manipulated as necessary be-fore digital manufacture. Due to the costs of milling and the need to mill from a puck, most denture duplicates will probably be printed when done in the dental office.

Figure 1: The classic five-step approach to complete removable complete dentures.