January/February 2020

Roger D. Winland

2020 January/February; 68(1):5.

Samuel M. Strong

2020 January/February; 68(1):6-8.

Nathan Dinsbach

2020 January/February; 68(1):10-13.

Nathan J. Carillo
Leonard Golden
Mana Saraghi

2020 January/February; 68(1):14-17.

Roger A. Solow 

2020 January/February; 68(1):18-20.

Tanya M. Gibson

2020 January/February; 68(1):78, 80.

2020 January/February; 68(1):79.

Michael R. Meharry
Jaclyn Schwartz
Andrew Montalvo
Dustin Mueller
John C. Mitchell

To compare the shear bond strengths (SBSs) of 2 self-adhesive resin cements used with or without a self-etching primer, specimens were polished to expose enamel or dentin surfaces and randomly assigned to 12 test groups (n = 20). The tested variables were (1) the type of bonded tissue (enamel or dentin); (2) the cement used; (3) whether the cement was applied with or without a primer; (4) and whether the primer was air dried or photopolymerized. Compared to the control groups, the air-dried primer groups showed SBSs that were 4-6 times greater for specimens bonded to dentin and 2-3 times greater for specimens bonded to enamel. The photopolymerized primer groups followed the same pattern. The photopolymerized groups showed higher percentages of cohesive tooth failure than did air-dried primer groups.

2020 January/February; 68(1):22-28.

John K. Brooks
Sheena Sikka
Katherine Ong
Edward K. Gamson
Jeffery B. Price

Occasionally, tooth fractures may demonstrate exaggerated pathologic root migration, often resulting in tooth loss. The early propagation of the root fracture may not be readily identifiable, but increased root separation, isolated deep periodontal probing depth, and characteristic radiolucent changes ultimately may facilitate the diagnosis. This article describes 3 patients with unusual presentations of pathologic root migration in endodontically treated teeth restored with full-coverage crowns.

2020 January/February; 68(1):30-35.

David J. Weyh
Jarom J. Ray

The cyclic fatigue resistance, scanning electron microscopic appearance, and energy dispersive X-ray profiles of 6 rotary files were compared in pairs: ProTaper Gold vs EdgeTaper Platinum; ProTaper Universal vs EdgeTaper; and Vortex Blue vs EdgeSequel Sapphire. The rotary files were tested in 2 sizes of each type. When similar file types and sizes were paired in independent-samples t tests, statistically significant differences (P < 0.0001) in cyclic fatigue resistance were established. The matched file pairs exhibited differences in design, particularly at the tips. Nickel and titanium were present in similar percentages (1:1 atomic ratio) for all file types. The disparities in cyclic fatigue results and tip design indicate that clinicians should not expect identical clinical performance from different files.

2020 January/February; 68(1):36-39.

Diego José Gambin
Luciana Oliveira Leal
Ana Paula Farina
Matheus Albino Souza
Doglas Cecchin

The objective of this study was to evaluate the antimicrobial capacity of glycolic acid (GA) as a final irrigant during the preparation of root canals. The sectioned root canals of extracted human teeth were contaminated with Enterococcus faecalis. The roots were divided into 7 groups (n = 10) and irrigated with 0.9% saline solution (NaCl); 6% NaOCl; 17% EDTA; 10%, 17%, or 25% GA; or 17% citric acid (CA). The greatest bacterial reduction was observed in the group irrigated with 6% NaOCl (P < 0.05). There were no statistically significant differences among the groups irrigated with GA in different concentrations (P > 0.05), but they all demonstrated greater disinfection capacity than CA, EDTA, and NaCl (P < 0.05).

2020 January/February; 68(1):41-44.

Carlos A. Jurado
Akimasa Tsujimoto
Luis G. Guzman
Nicholas G. Fischer 
Mark D. Markham
Wayne W. Barkmeier
Mark A. Latta

This case report describes implant therapy with ultratranslucent monolithic zirconia restorations in the esthetic zone. Adequate pink esthetics were achieved by delayed titanium implant placement in conjunction with guided bone regeneration.

2020 January/February; 68(1):46-49.

Toni Tien Neumeier
Harold Neumeier
Gene Peterson

The edentulous population is increasing globally despite advancements in dental materials and technology. Computer-engineered complete dentures can significantly reduce clinical time, provide better patient satisfaction, and enable digital record archiving. This case report describes the replacement of 30-year-old, ill-fitting dentures with digitally designed and milled prostheses that restored the vertical dimension of occlusion, masticatory function, and esthetics.

2020 January/February; 68(1):50-55.

Kevin C. Lee
Sung-Kiang Chuang

The purpose of this retrospective, observational study was to characterize the amounts and types of healthcare industry payments made to dental care providers in 2017. The authors collected data from the Open Payments database maintained by the US Centers for Medicare & Medicaid Services. Providers were classified as general dentists or specialists. Dentists received 321,627 industry payments totaling $110,750,601. The majority of dentists in this study received less than $200; the distribution of payments was positively skewed by a few top earners. The effect of these payments on clinical practice remains to be seen.

2020 January/February; 68(1):56-60.

Saeed Asgary
Bita Talebzadeh

This case report describes treatment of a 35-year-old woman who had a progressive apical lesion after nonsurgical endodontic retreatment of her maxillary left lateral incisor. Histopathologic examination of surgical specimens obtained during root-end resection revealed a radicular cyst associated with actinomycosis. If a tooth is nonresponsive to nonsurgical endodontic treatments, apical actinomycotic infection should be suspected and a surgical approach should be planned to obtain a successful outcome.

2020 January/February; 68(1):61-64.

Rafael Binato Junqueira
Lílian Azevedo de Souza-Nunes
Flávia Almeida Ribeiro Scalioni
Naiana Nolasco de Lima Damasceno
Francielle Silvestre Verner
Antônio Carlos Pires Carvalho
Marcos Vinícius Queiroz de Paula
Karina Lopes Devito

Cone beam computed tomograms were examined to evaluate the relationships between the root apices of maxillary posterior teeth and the maxillary sinus (MS) floor. The more posterior a tooth was in relation to the midline, the shorter the mean distance from the root apex to the MS floor (P < 0.05). Second molars exhibited the shortest distances between their root apices (especially the mesiobuccal root) and the MS and the greatest number of roots that were invaginating or in close contact with the MS. 

2020 January/February; 68(1):66-71.
 

André Gustavo de Lima Godas
Thaís Yumi Umeda Suzuki
Bruna de Oliveira Reis
André Luiz Fraga Briso
Wirley Gonçalves Assunção
Paulo Henrique dos Santos

This study evaluated the Martens hardness (HM) and elastic modulus (E_IT) of resin cement and dentin underlying the bonding interface of customized glass fiber posts luted to intraradicular dentin. Forty premolars were divided into 4 groups (customized or noncustomized glass fiber post, with or without mechanical cycling) and sectioned into thirds. For resin cement in the cervical region, the highest HM and E_IT values were observed in the noncustomized group after mechanical cycling. Similarly, in the underlying dentin, specimens in the noncustomized group after mechanical cycling had the highest HM values in the cervical region. Therefore, customization of glass fiber posts with composite resin is not essential for bonding to intraradicular dentin.

2020 January/February; 68(1):72-77.