Friday, December 15, 2017

Evaluation of Related Factors in the Failure of Endodontically Treated Teeth: A Cross-sectional Study

January 2018Volume 44, Issue 1, Pages 38–45 

Abstract

Introduction

The aim of this study was to review the factors related to the failure and extraction of unsuccessful endodontically treated teeth.

Methods

A total of 1000 teeth treated with nonsurgical root canal therapy were analyzed, and the following information was recorded for each patient: reasons for failure and extraction, type of tooth, presence and type of coronal restoration, smoking status, age, gender, and level of education. One main reason was recorded for each failed tooth. The associations between reasons for failure, patient, and tooth were tested by using χ2 analysis.

Results

Of the 1000 endodontically failed teeth analyzed in this study, 28.1% (n = 281) were extracted, 66% (n = 660) were re-treated, and 5.9% (n = 59) were treated with apical surgery. Among the reasons for failure, restorative and endodontic reasons were seen most frequently (43.9%, n = 439), whereas orthodontic reasons were seldom seen (0.1%, n = 1). The most common reason for extraction was for prosthetic reasons (40.8%), and perforation/stripping was the least common (2.9%). The mandibular first molars were the most frequently extracted teeth (27.4%, n = 77).

Conclusions

The most common reason for the extraction of endodontically treated teeth was for prosthetic reasons. Among the reasons for failure, restorative and endodontic reasons were the most frequently seen, and orthodontic reasons were the most seldom. The teeth that failed most frequently were mandibular first molars, and the teeth that failed least frequently were maxillary third molars. The most common reason for the extraction of failed endodontically treated teeth was for prosthetic reasons.

Thursday, December 14, 2017

Inter-and intra-examiner reliability of bitewing radiography and near-infrared light transillumination for proximal caries detection and assessment.

Dentomaxillofac Radiol. 2017 Dec 11:20170292. doi: 10.1259/dmfr.20170292. [Epub ahead of print]

Abstract

OBJECTIVES:

The purpose of this in vitro study was to evaluate the inter- and intra-examiner reliability of digital bitewing (DBW) radiography and near-infrared light transillumination (NIRT) for proximal caries detection and assessment in posterior teeth.

METHODS:

From a pool of 85 patients, 100 corresponding pairs of DBW and NIRT images (~1/3 healthy, ~1/3 with enamel caries and ~1/3 with dentin caries) were chosen. Twelve dentists with different professional statuses and clinical experience repeated the evaluation in two blinded cycles. Two experienced dentists provided a reference diagnosis after analysing all images independently. Statistical analysis included the calculation of simple (κ) and weighted Kappa (wκ) values as a measure of reliability. Logistic regression with a backward elimination model was used to investigate the influence of the diagnostic method, evaluation cycle, type of tooth, and clinical experience on reliability.

RESULTS:

Altogether, inter- and intra-examiner reliability exhibited good to excellent κ and wκ values for DBW radiography (Inter: κ = 0.60/ 0.63; wκ = 0.74/0.76; Intra: κ = 0.64; wκ = 0.77) and NIRT (Inter: κ = 0.74/0.64; wκ = 0.86/0.82; Intra: κ = 0.68; wκ = 0.84). The backward elimination model revealed NIRT to be significantly more reliable than DBW radiography.

CONCLUSIONS:

This study revealed a good to excellent inter-and intra-examiner reliability for proximal caries detection using DBW and NIRT images. The logistic regression analysis revealed significantly better reliability for NIRT. Additionally, the first evaluation cycle was more reliable according to the reference diagnoses.

Tuesday, December 12, 2017

Quality of Life of Implant-Supported Overdenture and Conventional Complete Denture in Restoring the Edentulous Mandible: A Systematic Review



doi: 10.1097/ID.0000000000000668
Meta-Analyses and Systematic Reviews

Objective: The aim of this systematic review was to evaluate the oral health-related quality of life (OHRQoL) associated with an implant-supported overdenture (IOD) compared with a conventional complete denture (CCD) in restoring the edentulous mandible.
Methods: A literature search was performed in the MEDLINE (through Ovid), PubMed, and Cochrane Library databases for articles published between 1990 and July 2016. The search was restricted to articles published in English. Two reviewers selected the articles based on the inclusion and exclusion criteria. Another 2 reviewers analyzed the data.
Results: From 108 articles that were obtained, 5 articles met the inclusion criteria. Four studies had a high risk of bias, and 1 study had an unclear risk of bias. There was a significant difference in Oral Health Impact Profile (OHIP) scores between pre- and post-treatment within the groups and in posttreatment OHIP scores between IOD and CCD groups.
Conclusion: Regarding the edentulous mandible, patients benefited more from the IOD with 2 implants, as determined by OHRQoL scores. Considering the differences between each domain of the Oral Health Impact Profile (OHIP) questionnaire and the lack of long-term performance, more random control trials with sufficient sample sizes need to be designed to investigate long-term performance after treatment.

Monday, December 11, 2017

The Effect of Disinfection with Chlorhexidine on the Shear Bond Strength of Equia Resin-Modified Glass Ionomer Cement to Dentin in Permanent Teeth after Two Thermocycling Protocols


Abstract


Statement of the Problem: There are some concerns regarding the effect of chlorhexidine (CHX) applied for cavity disinfection on the bond strength of adhesive restorations to dentin.
Purpose: This study sought to assess the effect of CHX on the shear bond strength (SBS) of Equia resin-modified glass ionomer cement (RMGIC) to dentin in permanent teeth.
Materials and Method: In this experimental study, the buccal surface of 84 freshly extracted human premolars was ground to expose the flat dentin. The samples were randomly assigned to four groups (n=21). The steps were as following in the group Ia: conditioning, Equia RMGIC, 500 thermal cycles; group Ib: conditioning, Equia RMGIC, 6000 thermal cycles; group IIa: conditioning, CHX, Equia RMGIC, 500 thermal cycles, and group IIb: conditioning, CHX, Equia RMGIC, and 6000 thermal cycles. Twenty samples from each group were subjected to SBS test and one sample was inspected under a scanning electron microscope. Data were analyzed using two-way ANOVA and t-test.
Results: The SBS was significantly different among the groups (p= 0.007). The groups subjected to 500 thermal cycles showed significantly higher SBS to dentin when they were treated with CHX (p= 0.000). There was no significant difference between samples thermocycled for 6000 cycles with and without application of CHX (p= 0.269). The SBS in the groups that were thermocycled for 6000 cycles (Ib and IIb) was lower than those thermocycled for 500 cycles (Ia and IIa). This difference between IIa and IIb was statistically significant (p= 0.007).
Conclusion: Chlorhexidine can positively affect the short term SBS of Equia RMGIC to dentin.

Friday, December 08, 2017

The Risk Factors in Early Failure of Dental Implants: a Retrospective Study

Abstract


Statement of the Problem: Despite the low failure rate of dental implants, recognition of the risk factors can enhance the predictability of failure.
Purpose: The aim of this study was to evaluate the risk factors for early implant failure.
Materials and Method: This retrospective cohort study was conducted on two groups of patients, the patients with a failed implant before loading and those without a failed implant. Age, gender, implant type, implant surface, implant length, bone type, type of surgery (one- or two-stage) and immediate (fresh socket) or delayed placement of implant were the variables to be assessed in this study.
Results: Out of the 1,093 evaluated implants, 73 cases (6.68%) failed in early stages. The two groups were significantly different in terms of implant surface, fresh socket placement, prophylactic use of antibiotics, and bone density (p< 0.05). Age, gender, implant height, implant type (cylindrical or tapered) and one-stage or two-stage placement were not significantly different between the two groups (p> 0.05).
Conclusion: It seems that prophylactic antibiotic therapy, implant surface, bone density and placement in fresh extraction socket may contribute to dental implant failure.

Thursday, December 07, 2017

V-Posil MonoFast VPS from Voco


V-Posil MonoFast

Hydrophilic Precision VPS Monophase Impression Material with smart setting characteristics

Indications

V-Posil Mono Fast is to be used as a medium bodied tray or syringeable impression material for:
Taking impressions over fixed/removable restorations and implants (i.e., transferring impression posts and bridge components)
Functional impressions
Fabricating crown and bridgework or inlays
Fabricating full or partial dentures
Reline impressions
Transferring root posts when fabricating posts and cores indirectly
Multi tray technique
Use in the simultaneous mixing technique as well as the putty-wash technique

Advantages

  • Its medium viscosity and thixotropic flow properties combined with smart setting times it is particularly suited to fixation impression for combined prosthetic work and in implantology
  • Up to 2-minutes of adjustable working time gives control over the pace of the procedure, while the abbreviated 2-minutes thermo-activated set time, saves time and improves patient comfort
  • The rapid snap set reduces the time in the critical zone by up to 50% minimizing potential distortion due to human error resulting in less re-takes
  • Due to its low polyether-like contact angle of less than 10° V-Posil’s superior hydrophilicity displaces fluids (saliva, blood etc.) creating an enhanced contact to the dental anatomy – yielding more precise impressions
  • Lab technicians will appreciate the post-set hydrophilicity (< 6° contact angle) which allows for more accurate stone models and better fitting restorations
  • Exceptional tear strength and elastic recovery ensures dimensional accuracy of the impression during and after removal
  • Easy to trim without air bubbles

Wednesday, December 06, 2017

Voco Grandio® blocs Nano-Ceramic Resin Hybrid CAD/CAM Block




VOCO proudly introduces Grandio blocs, the new 86% filled nano-ceramic resin hybrid CAD/CAM block indicated for crowns, inlays/onlays, veneers, and implant supported crowns.  With a combination of optimal tooth-like physical properties, category leading compressive strength, extremely low water absorption, and natural esthetics with enhanced color stability, Grandio blocs provide a new solution for practitioners and labs that are looking to streamline their CAD/CAM processes and deliver high quality restorations. 


Its unique nano-ceramic resin hybrid make-up allows for excellent polishability and enables Grandio blocs to be milled more finely and achieve even greater accuracy of fit and esthetics as good as pure ceramic CAD/CAM blocks.  Additional advantages are realized by the materials ease-of-use as it eliminates the firing process, simplifies polishing and allows for intraoral repairs.  With such time and money saving benefits, Grandio blocs offers a unique value. 

Processed using standard milling devices, Grandio blocs are available in multiple shades and two sizes.
  
Phone:                                   888-658-2584
Fax:                                         888-849-3989
Email:                                    infousa@voco.com

Effect of Simplifying Drilling Technique on Heat Generation During Osteotomy Preparation for Dental Implant


doi: 10.1097/ID.0000000000000692
Basic and Clinical Research
Objectives: To test the hypothesis that there would be no difference in heat production by reducing the number of drills during the implant site preparation relative to conventional drilling sequence.
Methods: A total of 120 implant site preparations with 3 different diameters (3.6, 4.3, and 4.6 mm) were performed on bovine ribs. Within the same diameter group, half of the preparations were performed by a simplified drilling procedure (pilot drill + final diameter drill) and other half using the conventional drilling protocol (pilot drill followed by graduated series of drills to widen the site). Heat production by different drilling techniques was evaluated by measuring the bone temperature using k-type thermocouple and a sensitive thermometer before and after each drill.
Results: Mean for maximum temperature increase during site preparation of the 3.6, 4.3, and 4.6-mm implants was 2.45, 2.60, and 2.95° when the site was prepared by the simplified procedure, whereas it was 2.85, 3.10, and 3.60° for the sites prepared by the conventional technique, respectively. No significant difference in temperature increase was found when implants of the 3 different diameters were prepared either by the conventional or simplified drilling procedure.
Conclusions: The simplified drilling technique produced similar amount of heat comparable to the conventional technique that proved the initial hypothesis.