A Dental Blog With The Latest Dental News & Dental Technology For Your Dental Practice.
Thursday, June 29, 2017
Wednesday, June 28, 2017
Effect of Split-File Digital Workflow on Crown Margin Adaptation
Abstract
Purpose
Computer-aided design/computer-aided manufacturing (CAD/CAM) is becoming increasingly integrated into dental practice workflow at a pace that exceeds scientific validation. The aim of this study is to evaluate a complete digital split-file protocol relative to segmental digital and analog techniques for restoring a single maxillary anterior edentulous space with custom abutment and crown.Materials and Methods
Four treatment workflows were assessed: complete digital (CD), segmental digital (SD), milled wax (AM), and heat pressed and hand waxed (AH) and heat pressed. The CD workflow “split” an abutment and crown into separate files to fabricate a zirconia abutment and both zirconia/lithium disilicate crown restorations. The SD workflow scanned the existing abutment for design of segmental restorations in zirconia, lithium disilicate, and milled wax (AM). The AH specimens were conventionally hand waxed. Both the AM and AH specimens were heat pressed with lithium disilicate. All restorations were evaluated with standardized measurements using scanning electron microscopy (SEM) as manufactured without internal adjustments and after manual adjustment. The number of adjustments, adjustment time, and location of adjustments were recorded. One-way ANOVA with repeated measures was used to report geometric means with 95% confidence intervals.Results
The mean marginal gap after adjustment of the CD group was 69 μm, with an upper bound (UB) of 79 μm and a lower bound (LB) of 60 μm. SD group mean was 26 μm with an UB of 31 μm and LB of 22 μm. The AM group mean was 32 μm, with an UB of 49 μm and a LB of 20 μm; AH group mean of 26 μm with an UB of 34 μm and a LB of 20 μm. The SD, AM, and AH workflows were statistically similar (p = 1.000), and the CD workflow was statistically greater than the other three (p < 0.001).Conclusions
The split-file (CD) protocol results in marginal gap size within clinical standards after adjustment; however, 52 of the 60 digitally produced restorations showed a horizontal marginal offset that required adjustment for proper contours.Tuesday, June 27, 2017
V-Posil Time-Optimized VPS Impression System
Maximum Precision in Up to 30% Less Chair Time
VOCO presents V-Posil, the
maximum precision VPS impression system with optimized timing for reduced headaches
and chair time.
V-Posil is flavorless and
offers up to 2-minutes of adjustable working time, giving the practitioner
control over the pace of the procedure while the abbreviated 2-minute
thermo-activated set time improves patient comfort and limits procedural time. Likewise, V-Posil’s rapid snap-set benefits
both the practitioner and the patient by reducing the time spent in the
critical zone by up to 50%, minimizing potential distortion due to human error,
which results in less costly retakes. Through V-Posil’s optimized timing VOCO
has been able to combine the working time of a regular-set with the short
setting time of a fast-set in one single material.
With a low polyether-like
contact angle of less than TEN degrees (<10 span="">°), V-Posil’s superior
hydrophilicity displaces fluids (saliva, blood, etc.) to create an enhanced
contact to the dental anatomy, yielding more precise impressions. Additionally, V-Posil provides exceptional tear strength and elastic recovery (99.6%) to
ensure dimensional accuracy of the impression after its removal. Lab Technicians will appreciate V-Posil’s unique
post-set contact angle of less than SIX degrees (<6 a="" accurate="" better="" ensures="" fitting="" for="" hydrophilicity="" models="" more="" post-set="" providing="" restorations.="" span="" stone="" that="">
Featuring four different
viscosities including two tray materials in V-Posil Putty Fast and Heavy Soft
Fast and two wash materials in V-Posil Light Fast and X-Light Fast, V-Posil’s
indications include the full range of impression techniques as well as reline/rebase
impressions and impressions for removable dental prostheses. All four
viscosities are available in 50ml cartridge refills while the V-Posil Heavy
Soft Fast, formulated for both easy loading and removal after it is set, is also
available in the 380ml automix Dynamic Dispenser cartridge.
Manufacturer: VOCO America Inc.
Contact Number: 1-888-658-2584
Contact Email: infousa@voco.com
Monday, June 26, 2017
Taub Products Announces Release of New Eyewash station
Jersey City, NJ: June 22, 2017 - TAUB Products, a long-time manufacturer
of dental laboratory and restorative products, has introduced a low-profile
emergency eyewash station that adapts to a wide range of office and laboratory
faucets. The new station provides instant access to a single aerated water jet,
flushing the eyes and washing the face of chemical or particulate
contamination.
Jordan Taub, Vice President of TAUB,
stated, “The unique design allows water to flow normally downward for washing
hands, and during an emergency, the user can quickly rotate it upwards,
providing a soft stream of water that will wash the face. The user places the
water stream on the brow of the nose and both eyes receive an effective rinse.”
Setting this apart from dual-jet designs,
the key features of the product include a single rotating nozzle to wash eyes
and face, a low-profile modern design that fits most standard faucets, a flow
rate of 1.2 gallons per minute, which exceeds ANSI standards, and a design that
prevents standing water, thus reducing the chance for mold development.
TAUB Products is celebrating its 65th
year in business. TAUB provides innovative, high-quality solutions for dental
professionals. For more information on TAUB and its products, call
800-828-2634, or go to www.taubdental.com.
Friday, June 23, 2017
A Novel Evidence-Based Periodontal Prognosis Model
Abstract
Objective
Patients
with periodontal disease and the dental professionals responsible for
their care want to know which teeth are expected to respond favorably to
periodontal treatment and which teeth are likely to be lost in the
short and long term. A number of different periodontal prognosis systems
have been previously proposed but do not consider important
patient-level factors, such as smoking and diabetic control, in the
calculation of the expected outcome and often use subjective measures
that introduce potential inaccuracies. The aim of this report is to
translate the best available evidence on periodontal prognosis into a
clinical model to facilitate decision-making and improve patient
outcomes.
Methods
Criteria
for an ideal prognostic system were proposed and used to assess the
previously reported models. With an emphasis on the inclusion of
patient-level modifiers (PLMs) and the exclusive use of objective
parameters, a new evidence-based model was developed.
Results
This
report proposes a new tooth-level prognosis model that uses 9
evidence-based quantifiable parameters to provide a prognosis of secure,
doubtful, poor, or irrational to treat. Six tooth-level risk predictors
(bone loss:age, pocket depth, furcation involvement, infrabony defects,
anatomical factors, and mobility) and 3 PLMs (smoking, diabetes, and
bleeding on probing) are used to determine the expected course of
disease with specific reference to the suitability of the tooth for
future dental treatment.
Conclusions
PLMs
must be considered when determining the prognosis of a tooth with
periodontal disease. The model proposed in this report is based on the
best available evidence for factors affecting tooth survival and has
been designed to be as simple and objective as possible to facilitate
its adoption in clinical practice. It will be retrospectively and
prospectively validated to determine its ability to accurately predict
the course of disease.
Thursday, June 22, 2017
Erbium Laser Technology vs Traditional Drilling for Caries Removal: A Systematic Review with Meta-Analysis
Available online 18 May 2017
Abstract
Objective
The study aimed to assess the efficacy of erbium laser technology compared with traditional drilling for caries removal.
Methods
A
systematic search was conducted through Medline via PubMed, Embase,
Cochrane databases, CNKI till December 2016. Randomised controlled
trials, quasi-randomized controlled trials, or controlled clinical
trials with data comparing the efficacy of erbium laser technology
versus traditional drilling for caries removal were included.
Results
Fourteen
studies were selected in our meta-analysis. Erbium laser technology
showed an increased time when removing caries compared with drilling
(mean difference: 3.48, 95% confidence interval: 1.90-5.06, P <
.0001). However, erbium laser technology reduced the requirement for
local anesthesia (risk ratio: 0.28, 95% confidence interval: 0.13-0.62, P =
.002). Erbium laser technology was also not significantly different to
traditional drilling with regard to restoration loss, pulpal vitality,
and postoperative sensitivity.
Conclusions
Erbium
laser technology showed an increased time for cavity preparation
compared with traditional drilling. However, erbium laser technology
reduced the requirement for local anesthesia. There was no significant
difference between erbium laser technology and traditional drilling
regarding restoration loss, pulpal vitality, and postoperative
sensitivity.
Wednesday, June 21, 2017
CAD/CAM-fabricated ceramic implant-supported single crowns made from lithium disilicate: Final results of a 5-year prospective cohort study
Abstract
Background
All-ceramic bilayer systems suffer from technique-sensitivity, resulting in increased technical complication rates. This might be overcome by monolithic reconstructions, facilitating digital workflows.Purpose
To evaluate the clinical and patient-reported outcome of CAD/CAM-fabricated implant-supported single crowns (ISCs) made of lithium disilicate (LS2) cemented on ceramic implants 5 years after implant installation.Materials and methods
Twenty-four patients were included in the study. All participants received a one-piece ceramic implant in anterior (4 incisors) and posterior regions (10 premolars, 10 molars). LS2 crowns were computer-aided designed (CAD), manufactured (CAM) and adhesively luted onto the implants. Follow-ups were performed yearly up to 60 months after implant installation. The survival/success rates of the restorations were calculated according to modified US Public Health Service criteria as follows: Clinically relevant defects that could be repaired intraorally were accepted for survival, whereas small-area chippings, roughness (ø < 2 mm), slightly soundable marginal gaps, minimal undercontours/overcontours, and tolerable color deviations were accepted for success. Kaplan-Meier plots were used for the success/survival analyses. Furthermore, patient-reported outcome measures (PROMs) were assessed by applying visual analog scales (VAS). Linear (PROMs) and logistic (USPHS criteria) mixed models were fitted to evaluate time effects on response variables.Results
Twenty-two ISCs could be evaluated 55.2 ± 4.2 months after prosthetic delivery. Two patients were reported as drop-outs (1 died, 1 moved abroad). No failures were observed, resulting in 100% survival. At two ISCs, a major-roughness had to be treated. This resulted in a Kaplan-Meier success estimate of 91.7% (95%CI: 70.6%-97.9%). Compared with pretreatment, all surveys at prosthetic delivery except for self-esteem (P = .375) showed significantly improved VAS scores. No decrease in satisfaction could be observed over time until the end of follow-up (P ≥ .056).Conclusion
Concerning survival/success rates and PROMs, the evaluated crown-implant system showed favorable mid-term results. To date, there are no comparable data available for implant-supported ISCs made of LS2.
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