Friday, September 22, 2017

Effect of Simulated Mastication on the Retention of Locator Attachments for Implant-Supported Overdentures: An In Vitro Pilot Study

First published:

Abstract

Purpose

Limited information is currently available relative to the effect of masticatory loads on the retentive properties of Locator attachments. The aims of this in vitro study were to assess and compare the effect of simulated mastication on the retention of white, pink, and blue Locator inserts for overdentures retained by 2 implants.

Materials and Methods

Thirty specimens simulating a nonanatomic edentulous flat ridge with two implants and an overdenture were divided into 3 groups according to the color of the fitted insert: transparent clear group (n = 10), pink group (n = 10), and blue group (n = 10). Retention forces were measured in an axial direction initially and after 100,000 cycles of simulated masticatory loads. One-way ANOVA followed by Tukey's post hoc tests were used to compare retention values and percentage retention loss between the 3 groups with significance set at p = 0.05.

Results

The 3 groups presented significant differences in retention at baseline (9.95 ± 1.91 N, 15.43 ± 4.08 N, and 41.73 ± 9.29 N for the blue, pink, and clear groups, respectively) and after simulated mastication (6.37 ± 2.64 N, 14.00 ± 3.89 N, 38.20 ± 5.11 N for the blue, pink, and clear groups, respectively). Within the same group, cyclic loading did not significantly affect retention in the clear and pink groups, while the blue inserts showed a significant retention loss (-37%) after loading.

Conclusions

The results suggest that short-term simulated mastication affects the extra-light blue inserts but not the more-retentive inserts.

Thursday, September 21, 2017

Color stability of lithium disilicate ceramics after aging and immersion in common beverages

Abstract



 

Statement of problem

The color of an esthetic restoration and its color stability are important for long-term success. However, the impact of common beverages on lithium disilicate ceramic is not well known.

Purpose

The purpose of this in vitro study was to investigate color variations of lithium disilicate ceramics after thermal cycling (TC) and immersion in commonly consumed beverages.

Material and methods

A total of 288 specimens (1×10×10 mm) were fabricated from IPS e-max computer-aided design (CAD) (n=72), IPS e-max CERAM ([CER] n=72), IPS e-max Press with glazing ([PG] n=72), and IPS e-max Press without glazing ([PNG] n=72) according to the manufacturer's instructions. Each group was divided into 4 subgroups (n=18): TC, coffee, black tea, and red wine. Thermal cycling was performed at 21 900 cycles at 5°C, 37°C, 55°C, and 37°C (3 years’ clinical simulation), whereas the specimens were soaked in the staining solutions for up to 54 hours (3 years’ clinical simulation). Color parameters L*, a*, and b* were assessed with an ultraviolet-visible spectroscopy recording spectrophotometer. Color difference (ΔE) was calculated using the equation [ΔΕ= [(ΔL*)2 + (Δa*)2 + (Δb*)2]½]. Intraexaminer reliability was assessed by using the intraclass correlation coefficient. Two-way analysis of variance was used for the analysis of ΔΕ, and the parameters L*, a*, and b* were analyzed with linear mixed models for repeated measurements and the Bonferroni pair-wise comparison test (α=.05).

Results

Parameters ΔΕ, L*, a*, and b* were significantly affected by the interaction between material and treatment (P<.001). A ΔΕ >1 was recorded for PG with tea, wine, and coffee, PG after TC and CER after TC. For L*, greater reduction was observed for PNG with tea and CER after TC, whereas for a* significant changes were positive (to red shades), except for PNG with TC, where PNG with wine showed the greatest positive change. For b*, significant changes were negative (to blue shades) except for PNG with tea and coffee and CAD with tea.

Conclusions

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Wednesday, September 20, 2017

Short dental implants: A scoping review of the literature for patients with head and neck cancer

Journal of Prosthetic Dentistry Published online: September 16, 2017

Abstract

Statement of problem

Dental implants can be essential in the rehabilitation of various cancer defects, but their ideal placement can be complicated by the limited dimensions of the available host bone. Surgical interventions developed to increase the amount of bone are not all predictable or successful and can sometimes be contraindicated. Short dental implants have been suggested as an alternative option in sites where longer implants are not possible. Whether they provide a successful treatment option is unclear.

Purpose

The purpose of this study was to review the literature on short dental implants and assess whether they are a viable definitive treatment option for rehabilitating cancer patients with deficient bone.

Material and methods

A scoping review of the literature was performed, including a search of established periodontal textbooks for articles on short dental implants combined with a search of PubMed, MEDLINE, EMBASE, Web of Science, and Cochrane Database of Systematic Reviews. A search for all literature published before June 2016 was based on the following keywords: [‘dental implants’ OR ‘dental implantation, endosseous’ OR ‘dental prosthesis, implant supported’] AND [short].

Results

The minimum acceptable implant length has been considered to be 6 mm. The survival rates of short implants varied between 74% and 96% at 5 years, depending on factors such as the quality of the patient’s bone, primary stability of the implant, clinician’s learning curve, and implant surface. Short implants can achieve results similar to those of longer implants in augmented bone and offer a treatment alternative that could reduce the need for invasive surgery and associated morbidity and be safer and more economical.

Conclusions

Short dental implants (6 mm to 8 mm) can be used successfully to support single or multiple fixed reconstructions or overdentures in atrophic maxillae and mandibles. The use of short dental implants lessens the need for advanced and complicated surgical bone augmentation procedures, which reduces complications, costs, treatment time, and morbidity. Short implants could be an alternative in the rehabilitation of patients with cancer.

Tuesday, September 19, 2017

Digital versus conventional implant impressions for partially edentulous arches: An evaluation of accuracy

Journal of Prosthetic Dentistry Published online: September 16, 2017

Abstract

Statement of problem

To the authors’ knowledge, while accuracy outcomes of the TRIOS scanner have been compared with conventional impressions, no available data are available regarding the accuracy of digital impressions with the Omnicam and True Definition scanners versus conventional impressions for partially edentulous arches.

Purpose

The purpose of this in vitro study was to compare the accuracy of digital implant impressions using 2 different intraoral scanners (IOSs) with that of conventional impressions for partially edentulous arches.

Material and methods

Two partially edentulous mandibular casts with 2 implant analogs with a 30-degree angulation from 2 different implant systems (Replace Select RP; Nobel Biocare and Tissue level RN; Straumann) were used as controls. Sixty digital models were made from these 2 definitive casts in 6 different groups (n=10). Splinted implant-level impression procedures followed by digitization were used to produce the first 2 groups. The next 2 groups were produced by digital impression with Omnicam. The last 2 groups were produced by digital impression with the True Definition scanner. Accuracy was evaluated by superimposing the digital files of each test group onto the digital file of the controls with inspection software.

Results

The difference in 3-dimensional (3D) deviations (median ±interquartile range) among the 3 impression groups for Nobel Biocare was statistically significant among all groups (P<.001), except for the Omnicam (20 ±4 μm) and True Definition (15 ±6 μm) groups; the median ±interquartile range for the conventional group was 39 ±18 μm. The difference in 3D deviations among the 3 impression groups for Straumann was statistically significant among all groups (P=.003), except for the conventional impression (22 ±5 μm) and True Definition (17 ±5 μm) groups; the median ±interquartile range for the Omnicam group was 26 ±15 μm. The difference in 3D deviations between the 2 implant systems was significant for the Omnicam (P=.011) and conventional (P<.001) impression techniques but not for the True Definition technique (P=.247).

Conclusions

Within the limitations of this study, both the impression technique and the implant system affected accuracy. The True Definition technique had the fewest 3D deviations compared with the other 2 techniques; however, the accuracy of all impression techniques was within clinically acceptable levels, and not all differences were statistically significant.

Monday, September 18, 2017

3M, Patterson Dental Open Doors to Digital Dentistry



ST. PAUL‚ Minn. – (Sept. 14, 2017) – 3M Oral Care and Patterson Dental have signed a distribution agreement for 3M’s True Definition Scanner. The agreement brings Patterson’s customers the opportunity to explore digital dentistry via an open platform and a trusted partner. With the 3MTM True Definition Scanner, oral care professionals are choosing a digital hub that gives them an unrestricted entry point into traditional crown & bridge work with any lab, advanced implant solutions, clear aligners, in-office milling and more.
“Distributors have enjoyed putting the True Definition Scanner in front of dentists, because they know we’re standing behind it,” said Jim Ingebrand, vice president, Oral Care Solutions Division of 3M. “They can be confident that 3M is committed to ensuring it’s a success for the practice.”
The True Definition Scanner features the smallest wand on the market which means scanning with this system is not only comfortable for clinician and patient alike, it also delivers precision clinicians can trust. With a low-price entry into digital impressioning at just $16,995, the mobile scanner fits the size, mobility, practice requirements and budget needs of practitioners. The True Definition Scanner’s open architecture allows connection to the most common digital dentistry file formats. This gives dental practices the flexibility to choose the best output option for each case – helping manage the workflow the way the clinician wants it. 

“3M is a trusted brand and we’re excited to distribute the True Definition Scanner,” said Dave Misiak, president, Patterson Dental North America. “We have a long-standing relationship with 3M as strong Minnesota-based leaders in the dental industry and believe we now have the opportunity to serve 3M customers in new ways via our best-in-class service and support network.”
The True Definition Scanner is now available through Patterson Dental in the U.S. 

Visit 3M.com/TrueDef for more information about 3M’s True Definition Scanner or call 1-800-634-2249 to schedule an in-office demonstration.
3M Oral Care promotes lifelong oral wellness through inventive solutions that help oral care professionals achieve greater clinical, professional and personal success. Learn more at 3M.com/oralcare 

About 3M
At 3M, we apply science in collaborative ways to improve lives daily. With $32 billion in sales, our 90,000 employees connect with customers all around the world. Learn more about 3M’s creative solutions to the world’s problems at www.3M.com or on Twitter @3M or @3MNewsroom.

Sunday, September 17, 2017

Day two of Dentsply Sirona World: Better than Imagined



Grammy-winning band Imagine Dragons concluded the second day of the Ultimate Dental Meeting with a show-stopping concert after an eventful day of educational courses and extracurricular activities 

LAS VEGAS, N.V. (Sept. 16, 2017) – Day two of Dentsply Sirona World was chockfull of top-notch educational content and speakers, exhilarating activities and outstanding entertainment for the thousands of event attendees.
BeachbodyTM Super Trainer Joel Freeman kicked the morning into gear for hundreds of guests with his MMA-styled workout session, which was sponsored by ClearCorrect. The energizing workout was followed by a special meet and greet on the trade show floor. Freeman’s workout was designed to suit attendees of all ages and comfort levels, making this event the perfect start to day two of the Ultimate Dental Meeting.
Commencing the day’s educational sessions, General Session with Dr. Frank Spear and Dr. Gregg Kinzer began at 9 AM. Both presenters discussed the age of digital dentistry, the best means to better your performance and practice, and shared advice on how to obtain the best clinical outcomes with some of the best products and technologies on the market. Doors opened to the comprehensive trade show floor after the conclusion of Drs. Spears’ and Kinzer’s presentation.
After exploring the trade show, attendees took their seats to hear from award-winning author and TED Talk legend Simon Sinek during the day’s second General Session. Sinek, the pioneer of ‘leading with why’, spoke on different leadership styles and how to better encourage employees through trust and empowerment.
Various Breakout Sessions scheduled throughout the remainder of the day provided exceptional content to attendees eager to absorb the quality education presented before heading to the evening reception, and then to the highly-anticipated private concert by Imagine Dragons.
Before the Grammy-winning band rushed the stage, attendees flooded into the Venetian Ballroom elated to experience what was undoubtedly a highlight of the three-day extravaganza. Imagine Dragons slayed with their electrifying performance, which included chart-topping hits Radioactive, Thunder, On Top of the World and Believer. This exclusive concert was sponsored by Fortune Management.
Day three of Dentsply Sirona World promises to deliver extraordinary education in conjunction with spectacular activities and entertainment as the second annual Ultimate Dental Meeting draws to a close.
Stay up to date on daily activities, course schedules and more with the Dentsply Sirona World app, available for iOS and Android devices.
The sold-out Dentsply Sirona World is located at The Venetian and The Palazzo in Las Vegas and spans from Thursday, Sept. 14 to Saturday, Sept. 16. To learn more about this event and next year’s event, Dentsply Sirona World 2018, visit www.dentsplysiroanworld.com.

Friday, September 15, 2017

Opening day of Dentsply Sirona World exceeded expectations


After much anticipation, the first day of the second annual Ultimate Dental Meeting concluded with high praise 


Las Vegas, N.V. (Sept. 15, 2017) – After months of anticipation, Dentsply Sirona World 2017 has officially begun! This three-day event is the industry’s only educational festival, and those in attendance have now experienced the Dentsply Sirona difference.
The day started with the magnificent Opening General Session. With a ballroom submerged in darkness, LED light dancers wowed the audience with incredible illusions and captivating choreography. Immediately following, Group Senior Vice President of the U.S. Commercial Organization Michael Augins welcomed scores of people to one of the largest gatherings in dentistry. More than 7,000 people joined Dentsply Sirona in Las Vegas for this spectacular event; a record-breaking number for the company.
Throughout Opening General Session, industry titans Dr. Joshua Austin, Dr. Erin Elliot, Dr. Sarah Jockin and Dr. Cliff Ruddle offered a taste of what attendees could expect throughout this experience. New to General Session this year, Dr. Neal Patel performed lived surgery from the trade show floor just feet away while the audience watched via live stream.
At the close of Opening General Session, the vast trade show floor opened and eventgoers ventured the aisles, exploring the latest and greatest in dental technologies, products and services. In addition to top-notch exhibitors, the popular media panel was located on the trade show floor, allowing attendees to hear from some of the industry’s best.
The first group of Breakout Sessions opened for attendees in the early afternoon following lunch and the opening of the trade show. Sessions within 11 educational tracks were available throughout the afternoon into the early evening. Per tradition, attendees designed their schedules as desired and select the courses in which they were interested. Some chose to stick with one track while others selected courses within multiple tracks for a more comprehensive experience.
The second General Session, sponsored by Implant Seminars, featured Academy Award-nominated actor, producer and philanthropist Will Smith. Smith entered the stage ‘gettin’ jiggy wit it’ to a ballroom roaring with applause. One of the most popular celebrities of this generation discussed his climb to fame, and the successes and failures that steered the trajectory of his career.
As Smith reflected on an event in his childhood in which his father directed him to build a wall, Smith shared an inspiring metaphor on career growth: “Building a wall can be daunting, but if you focus on laying one perfect brick each day, the bricks eventually form a wall.”
Sponsored by Dental Product Shopper, the Welcome Reception- a wonderful opportunity for guests to network and socialize with peers- followed Smith’s session. Food and beverage were provided for guests as they geared up for the evening’s comedic entertainment.
Laughter permeated the ballroom as Jeff Dunham, a Forbes-listed comedian, performed his live standup for audiences later that evening. Dunham had his sidekicks in tow and re-energized the room after a full first day of Dentsply Sirona World. Dunham’s performance was sponsored by OperaDDS and included fan-favorite characters Walter, Bubba J, Peanut and Achmed, but not before he shared hilarious pictures from his past. Walter and Dunham’s satirical banter about dental professionals and the Ultimate Dental Meeting was perfectly tailored to fit the audience. Dunham’s performance concluded the first day of Dentsply Sirona World.
As the second day is upon us, attendees can expect more entertainment and even more quality education as this dental festival continues.
Stay up to date on daily activities, course schedules and more with the Dentsply Sirona World app, available for iOS and Android devices.
The sold-out Dentsply Sirona World is located at The Venetian and The Palazzo in Las Vegas and spans from Thursday, Sept. 14 to Saturday, Sept. 16. To learn more about this event and next year’s event, Dentsply Sirona World 2018, visit www.dentsplysiroanworld.com

Narrow implants (2.75 and 3.25 mm diameter) supporting a fixed splinted prostheses in posterior regions of mandible: one-year results from a prospective cohort study


International Journal of Implant Dentistry20173:43
Received: 23 March 2017
Accepted: 29 August 2017
Published: 8 September 2017

Abstract

Background

Can multiple splinted narrow-diameter implants be used as definitive implants in patients with insufficient bone ridge thickness in posterior regions of the mandible? With this aim, we evaluated their outcomes in this set up to 1 year after loading.

Methods

Forty-two patients with a mean age of 61.3 years old (range 49–73) in need of fixed prosthetic implant-supported rehabilitations in the posterior region of the mandible, presenting a thin alveolar crest, were selected. One hundred twenty-four narrow-diameter implants (2.75 and 3.25 mm diameter) were placed and splinted with a bridge. One implant for each missing tooth was requested to be inserted. Outcomes measured were implant survival, complications, and marginal bone level changes up to 1 year after loading.

Results

At the 12-month follow-up, three implants failed. Two 2.75 mm diameter implants and one 3.2 mm diameter implant failed. The implant survival rate was 97.6%. Peri-implant bone resorption was 0.20 mm (CI 95% 0.14: 0.26) after 6 months and 0.47 mm (CI 95% 0.29; 0.65) after 12 months of loading, not different between 2.75 and 3.25 mm diameter groups (p = 0.786). Of the 42 cases, three had an episode of peri-implant mucositis (7.1%).

Conclusions

Within the limits of this study, preliminary short-term data (1 year post-loading) suggested that narrow-diameter implants (2.75 to 3.25 mm) can be successfully used as a minimally invasive alternative to horizontal bone augmentation in the posterior mandible. However, larger and longer follow-ups of 5 years or more are needed.