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Tech Corner
Accuracy and precision of occlusal contacts of stereolithographic casts mounted by digital... PDF Print E-mail

Statement of problem

Little peer-reviewed information is available regarding the accuracy and precision of the occlusal contact reproduction of digitally mounted stereolithographic casts.

Purpose

The purpose of this in vitro study was to evaluate the accuracy and precision of occlusal contacts among stereolithographic casts mounted by digital occlusal registrations.

Material and methods

Four complete anatomic dentoforms were arbitrarily mounted on a semi-adjustable articulator in maximal intercuspal position and served as the 4 different simulated patients (SP). A total of 60 digital impressions and digital interocclusal registrations were made with a digital intraoral scanner to fabricate 15 sets of mounted stereolithographic (SLA) definitive casts for each dentoform. After receiving a total of 60 SLA casts, polyvinyl siloxane (PVS) interocclusal records were made for each set. The occlusal contacts for each set of SLA casts were measured by recording the amount of light transmitted through the interocclusal records. To evaluate the accuracy between the SP and their respective SLA casts, the areas of actual contact (AC) and near contact (NC) were calculated. For precision analysis, the coefficient of variation (CoV) was used. The data was analyzed with t tests for accuracy and the McKay and Vangel test for precision (α=.05).

Results

The accuracy analysis showed a statistically significant difference between the SP and the SLA cast of each dentoform (P<.05). For the AC in all dentoforms, a significant increase was found in the areas of actual contact of SLA casts compared with the contacts present in the SP (P<.05). Conversely, for the NC in all dentoforms, a significant decrease was found in the occlusal contact areas of the SLA casts compared with the contacts in the SP (P<.05). The precision analysis demonstrated the different CoV values between AC (5.8-8.8%) and NC (21.4-44.6%) of digitally mounted SLA casts, indicating that the overall precision of the SLA cast was low.

Conclusions

For the accuracy evaluation, statistically significant differences were found between the occlusal contacts of all digitally mounted SLA casts groups, with an increase in AC values and a decrease in NC values. For the precision assessment, the CoV values of the AC and NC showed the digitally articulated cast’s inability to reproduce the uniform occlusal contacts.

Marty Jablow DMD - Dental News and Technology

 
Final Cut Pro X helps small company delight world’s biggest clients PDF Print E-mail
When Trim Editing started creating music videos over a decade ago, just paying the rent was a huge accomplishment. Now, the small East London company is crafting award-winning visuals for big brands — like Audi, Nike, Adidas, and Guinness — propelled by the power of Final Cut Pro X. The video editing software’s comprehensive features allow Trim Editing to organize film and audio clips, pull together compelling projects, and make changes on the fly. “When I’m playing back an edit for a director, they’ll say, ‘Okay, let’s go and make those changes I talked about.’ I’ll say, ‘Oh, no, they’re already done,’ and we’ll jump back and watch it again. People can’t believe that I’ve magically done the change before we even finish playback,” says editor Thomas Grove Carter.
 
Evaluation of various polishing systems and the phase transformation of monolithic zirconia PDF Print E-mail

Abstract

Statement of problem

Although a well-polished monolithic zirconia surface is essential, insufficient comparative studies on the constituents and efficacy of polishing systems have been conducted.

Purpose

The purpose of this in vitro study was to analyze the abrasive constituents and compare the polishing effectiveness of 6 zirconia polishing systems, including their potential influence on the phase transformation of monolithic zirconia.

Material and methods

The compositions of 6 zirconia polishing systems were analyzed using energy dispersive spectroscopy (EDS). Sintered and high-speed ground monolithic zirconia specimens were used as control groups (n=14 specimens per group). Test groups (n=168) were pretreated identically to the control group and arbitrarily divided into 12 groups to examine 6 polishing systems for 2 polishing periods (60 or 120 seconds). The surfaces were characterized by a surface profiler and various analytic techniques, including x-ray diffraction (XRD) analysis. The data were analyzed using 2-way ANOVA and multiple comparisons and the Bonferroni method (α=.05).

Results

The abrasives were primarily composed of C, O, and Si. Diamond was identified as the main abrasive and SiC as the supplementary abrasive in the polishing systems. No significant differences were observed for the 60- or 120-second polishing times (P>.05). Four products had significantly lower surface roughness values than the other 2 (P<.001). The occlusal-adjustment-simulating pretreatment and polishing processes did not cause phase transformations in the zirconia specimens.

Conclusions

The monolithic zirconia polishing systems contained diamond and SiC abrasives. All zirconia polishing systems showed clinically acceptable results, and 4 systems exhibited lower surface roughness. Phase transformation did not occur during polishing procedure.

Marty Jablow DMD - Dental News and Technology

 
Long-term effect of periodontal surgery on oral health and metabolic control of diabetics PDF Print E-mail
Clinical Oral Investigations
pp 1-9
First online:

Abstract

Objective

The objective of this study was to evaluate impact of periodontal surgery on periodontal health and on glycaemia control of type 1 and type 2 (T1DM; T2DM) diabetics with severe periodontitis, during 12 months follow-up, in comparison with non-diabetic controls.

Materials and methods

A total of 23 T1DM and 10 T2DM patients with respective number of matched non-diabetics were examined prior to, and 3, 6 and 12 months after periodontal surgery. Glycosylated haemoglobin (HbA1c) reflected control of DM. Periodontal parameters were oral debris (DI-S), probing pocket depth (PPD), clinical attachment loss (CAL) and bleeding on probing (BOP).

Results

Periodontal status in all diabetics improved after 3 months and remained so during follow-up: mean (SD) DI-S > 1 (T1DM 1.1(0.5)/0.9(0.7); T2DM 1.2(0.4)/0.8(0.4)), PPD >5 mm (T1DM 35.1(32.2)/5.1(7.8); T2DM 46.3(24.2)/13.0(10.9)), CAL ≥6 mm (T1DM 44.4(37.0)/24.52(27.2)); mean % BOP >50 % (T1DM 57.1(25.1)/22.8(20.8)), T2DM 59.4(20.8)/18.9(15.7)), p < 0.05. Mean HbA1c values decreased in T2DM patients after 3 months and remained stable during follow-up. No improvement of glycaemia control was observed in T1DM patients. Positive correlation between mean HbA1c and CAL changes was observed (r = 0.842, p < 0.05). Mean changes of periodontal parameters did not differ between diabetics and controls.

Conclusion

Periodontal surgery improved significantly periodontal status of all patients and metabolic control of T2DM patients.

Clinical relevance

Research findings concerning long-term effect of periodontal surgery among patients with diabetes mellitus are scarce. We found that surgical periodontal treatment positively affects periodontal health of all diabetics and improves metabolic control of type 2 DM. There is a positive correlation between clinical attachment loss and glycosylated haemoglobin levels.


Marty Jablow DMD - Dental News and Technology

 
Root Canal Treatment versus Single-Tooth Implant: A Systematic Review of Internet Content PDF Print E-mail
Journal of Endodontics

Abstract

Introduction

There is an absence of professional consensus regarding when a tooth should be retained with root canal treatment and when to extract and replace it with an implant. Considering that patients often seek health-related information on the Internet, completeness and accuracy of online content are highly desirable. Websites should also fulfill several technical characteristics to be accessible to all.

Methods

The search term root canal treatment implant was entered into 4 search engines. The first 100 webpages per engine search were evaluated. After removal of duplicates, those webpages comparing root canal treatment against single-tooth implant by using the AAE Implant Statement criteria as a benchmark were included. Completeness of information was evaluated against the AAE Statement by using a binary scale assessment tool. The related content was synthesized by using a protocol for systematic review of textual, non-research evidence. The webpages/sites were assessed for accessibility, usability, reliability, and quality of information by using the DISCERN and LIDA tools.

Results

Twenty-six relevant webpages were found. Information completeness scores ranged from 1 to 6; however, nearly one third scored 1. Nine syntheses were derived relating to survival rates, tooth restorability, bone quality, esthetic demands, and systemic factors. The median overall scores for LIDA and DISCERN were 72% and 61%, respectively.

Conclusions

There is scarcity of information available on the Internet for the lay public with respect to the specific clinical question, although the webpages' content was consistent with available scientific literature. The accessibility, usability, reliability, and quality of information were largely moderate or low.

Marty Jablow DMD - Dental News and Technology

 
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