Association between traumatic occlusal forces and periodontitis: A systematic review.

J Int Acad Periodontol. 2019 Oct 1;21(4):148-158.

Abstract

OBJECTIVE:

Occlusal adjustment is commonly recommended for patients with periodontitis and traumatic occlusion. The objective of this systematic review was to analyze available evidence for the association between traumatic occlusal forces and periodontitis.

METHODS:

Two focused questions were proposed: What is the effect of traumatic occlusal forces on periodontal parameters in patients with and without periodontitis? And what is the effect of occlusal interventions on periodontal parameters in patients with periodontitis? A systematic review of clinical and observational studies was performed and presented in narrative form.

RESULTS:

After title and abstract review a total of 30 articles were retrieved and of these 14 full-text articles were retrieved for analysis. Two RCTs, 1 cohort, 4 retrospective and 7 cross-sectional studies were included. Cross-sectional studies reported a significant association between occlusal discrepancies and probing depth and clinical attachment level. However, the magnitude of the effect is negligible when groups with and without occlusal discrepancies are compared. Intervention studies reported a minimal effect on probing depth and clinical attachment level after occlusal adjustment in patients with periodontitis as compared to teeth without occlusal adjustment.

CONCLUSIONS:

Available human studies showed that there is limited evidence that traumatic occlusion is associated with periodontitis and to support the implementation of occlusal adjustment to significantly improve the periodontal condition in patients with periodontitis.

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At GNYDM 2019: Owandy Radiology Introduces the Smallest Plate Scanner in Dentistry

 Owandy-CR2 Delivers High Quality Images with Excellent Contrast; Including Digital Radiographs Taken at Low Radiation Doses
Mount Laurel, NJ  – November 7, 2019 – Owandy Radiology Inc., a global leader in the manufacture of dental radiology hardware and imaging software, will be showcasing its recently-launched Owandy-CR2 intraoral imaging plate scanner during the Greater New York Dental Meeting in booth #5236.
According to Owandy company spokesman Boris Loyez, “The Owandy-CR2 packs an incredible amount of performance and value into its remarkably small size. Its cutting- edge reading head produces accurate images even at low radiation doses and its specially-engineered image filters deliver high quality images with excellent contrast.”
The Owandy-CR2 is the perfect plate scanning solution for a wide range of clinical applications, including endodontics, prosthetics, implantology, periodontics, orthodontics and caries diagnosis. 
This scanner is highly intuitive, thanks to sensors that automatically detect the size and insertion direction of the plates being scanned. It was designed for proprietary use with Owandy plates and can scan the following Owandy plate sizes: #0 – child, #1 – incisor block, #2 adult, #3 – bitewing, #4 – occlusal block. The complete list of Owandy-CR2 features includes the following:
·       Smallest plate scanning system on the market
·       No complicated user interfaces
·       No buttons – Automatic plate detection and image display
·       Optimized sensitivity – High definition at low doses
·       Scans 4 Owandy plate sizes for optimal versatility
·       Automatic wakeup and standby mode
·       Ethernet or USB versions available
During the Greater New York Dental Meeting, the Owandy CR2, regularly priced at
$7,190.00 will be available at the discounted price of $6.490.00 – a $700.00 savings. To download a complete list of GNYDM show specials, click here.
The launch of the CR2  is part of Owandy’s strategic plan to coordinate major product launches around its U.S. dental meeting schedule. For example, the company debuted ungraded version of its popular I-Max 3-D during the recent ADA/FDI meeting.
The launch of the CR2 is part of Owandy’s strategic plan to coordinate major product launches around its U.S. dental meeting schedule. For example, the company debuted an upgraded version of its popular I-Max 3-D Panoramic System during the recent ADA/FDI meeting. Innovative new features included improved face scanning and airway imaging, which improve diagnosis, treatment planning and patient acceptance for the most common and profitable dental procedures, including dental sleep medicine. The I-Max 3-D will also be on display at GNYDM.
For more information about the Owandy-CR2 intraoral imaging plate scanner and other Owandy innovations, visit www.owandy.com, call 203-745-0575 or e-mail at sales@owandyus.com.Distributor inquiries are always welcome.
About Owandy Radiology, Inc.:
Headquartered in France, and serving North America from Mount Laurel, New Jersey, Owandy Radiology is a global leader in the manufacture of dental radiology hardware and imaging software. Its products are distributed through dental dealers across the USA, and in 50 countries world-wide, on every continent.
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Assessment of occupational noise-related hearing impairment among dental health personnel.

J Occup Health. 2019 Oct 31. doi: 10.1002/1348-9585.12093. [Epub ahead of print]

Abstract

OBJECTIVES:

The purpose of the study was to examine hearing thresholds among dental personnel. The secondary aim was to evaluate sound levels among dental equipment that dental personnel are exposed to.

METHODS:

Two hundred forty-four dentists, dental technicians, dental assistants, and dental students participated. Sixty-two participated as a control group. Audiological thresholds for the test groups were compared to the control group. All participants were from Jordan University Hospital. Participants completed a questionnaire in addition to their audiometric testing. Otoscopy, tympanometry, and pure tone audiometry were included in their assessment. Three-factor ANOVA and t tests were utilized to assess the statistical differences of hearing thresholds among the groups and between the two ears. Pearson correlation test was used to assess the effect of age, experience, and duration of exposure on the degree of hearing loss in the test groups for both ears.

RESULTS:

The authors reported statistically significant differences among hearing thresholds between the control group and others. Left hearing thresholds were noted to be significantly poorer in the left versus right ear at 1000, 2000, 4000, and 8000 Hz in dental assistants. The authors also reported a significant relationship between the degree of hearing impairment among dental assistants and the daily duration of exposure to dental occupational noise, followed by age.

CONCLUSION:

Hearing impairment was higher among dental professionals than the control group and especially among dental assistants and technicians. The authors recommended screening guidelines and adapting hearing protection methods for dental professionals and particularly for dental assistants and technicians.

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Accuracy of Intra-Oral Scans Compared to Conventional Impression in Vitro.

Prim Dent J. 2019 Nov 1;8(3):34-39. doi: 10.1308/205016819827601491.

Abstract

AIM:

The purpose of the present study was to assess the accuracy of intra-oral scans and conventional impression measured at various points on a single tooth preparation.

METHODS:

Ten conventional silicone impressions, and ten intra oral-scans using eight different digital intra oral digital scanners were taken of a prepared master tooth. The conventional impressions were directly digitised using a laboratory scanner. Each scan/impression was superimposed on a high-accuracy digital model of the prepared master tooth. For each superimposition, the deviation from the prepared master tooth was measured at six points on four two-dimensional cross-sections. Data was analysed using two-way analysis of variance (ANOVA).

RESULTS:

Most intra oral scanners had lower accuracy at the preparation margin compared to smooth surfaces. When only conventional impression and the latest intra oral scanners of various manufacturers are considered, the mean discrepancy at the preparation margin was 50μm (SD 16) for conventional impression, 15μm (SD 4) for trios 3, 26μm (SD 4) for LAVA TDS, 29μm (SD 7) for CEREC Omnicam, 30μm (SD 6) for CS 3600 and 64μm (SD 7) for GC aadva. The increased accuracy of trios 3 was statistically significant (p<0 .05="" p="">

CONCLUSIONS:

At the preparation margin, Trios 3 performed significantly better than conventional impression and the other intra oral scanners. LAVA TDS, CEREC Omnicam and CS3600 showed similar accuracy at the margin, yet better than conventional impression and GC Aadva.

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Effect of Er:YAG laser cavity preparation on the bond strength of 2‑hydroxyethyl methacrylate‑free and 2‑hydroxyethyl methacrylate‑rich self‑etch adhesive systems: An in vitro study

 

Abstract

Background: Despite many advantages of lasers and reduction of the risk of surface bonding
errors with newer self‑etch systems, they have not been thoroughly researched. This study was
done to evaluate the effect of Er:YAG laser cavity preparation on the microtensile bond strength
of 2‑hydroxyethyl methacrylate (HEMA)‑rich and HEMA‑free one‑step self‑etch adhesive systems.

Materials and Methods: In this in vitro study, eighty freshly extracted human premolars were
collected. Cavities were prepared in 40 teeth with carbide bur (Group 1) and in other 40 teeth
with Er:YAG LASER (490 mJ and 15 Hz) (Group 2). Subgroups of twenty teeth each were made
according to the adhesive systems used. After placement of restoration, the mean values of the bond
strength were calculated using universal testing machine. Data were then tabulated and analyzed
using descriptive statistics (Significant at P < 0.05).

Results: The overall microtensile bonding strength was higher when the cavities were prepared
with bur compared to those with Er:YAG laser. Mean bond strengths of single‑bottle self‑etching
seventh‑generation dentin bonding agents to bur‑prepared cavities were higher than those to
laser‑prepared cavities irrespective of the adhesive system (P = 0.01). No statistically significant
difference was observed between HEMA‑free and HEMA‑rich self‑etch adhesive systems.

Conclusion: The effect of Er:YAG laser for cavity preparation did not show improved performance
when evaluated using microtensile bond strength with seventh‑generation bonding agents, Adper
Easy One and G‑Bond. More studies are required to assess the effect of lasers.

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Facially Driven Digital Diagnostic Waxing: New Software Features to Simulate and Define Restorative Outcomes

Abstract

Purpose of Review

Computer-aided design (CAD) softwares minimize human designing errors, reduce time and cost, and serve as more powerful diagnostic and designing tools for treatment planning in restorative dentistry when compared with conventional diagnostic waxing techniques. The goal of this article was to review the features of the available dental and open-source CAD softwares for a facially driven digital diagnostic waxing elaboration.

Recent Findings

The literature review demonstrated that when digital technologies are selected, the fundamental concepts remain, but the protocol differs. When fabricating a facially driven diagnostic waxing, the digitized dentition obtained from either an intraoral scanner or digitized conventional stone cast can be merged with either two-dimensional (2D) photographs or three-dimensional (3D) extraoral facial scans of the patient at different positions. This superimposition procedure has been described in dental and open-source CAD softwares. Indeed, dental CAD softwares offer intuitive tools for dental professionals; however, the flexibility in creating virtual designs is more limited compared with open-source softwares.

Summary

Digital technologies serve as a more powerful diagnostic and design tool when compared with conventional procedures. The integration of different digital technologies has promoted the development of a 3D virtual patient, allowing clinicians and dental technicians to superimpose data on patients’ facial skeletons, extraoral soft tissue, and dentition. Both dental and open-source CAD softwares greatly improve the facially driven diagnostic waxing predictability because they incorporate the patient’s facial references.
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