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- Ross A Yost, Brian E. Bergeron, +4 authors Kent A Sabey
- Journal of endodontics
- 2015

INTRODUCTION
The aim of this study was to evaluate NaOCl apical extrusion by using negative apical pressure (EndoVac), sonic agitation (EndoActivator), side-vented needle (Max-i-Probe), and photon induced photoacoustic streaming (PIPS 10 mJ and PIPS 20 mJ) laser irrigation in an in vitro gel model.
METHODS
Extracted mandibular and maxillary central… (More)

- Rhett B Casper, Howard W Roberts, Mark D. Roberts, Van T . Himel, Brian E. Bergeron
- Journal of endodontics
- 2011

INTRODUCTION
Recent innovative manufacturing techniques have produced nickel-titanium (NiTi) rotary instruments with reports of superior properties compared with standard NiTi files. These include Profile Vortex made from M-Wire (PV), Twisted Files (TF), and 10 Series files made from CM Wire (CM). Sterilization is recommended before use and is repeated if… (More)

- Scott T Seago, Brian E. Bergeron, +4 authors Kent A Sabey
- Journal of endodontics
- 2015

INTRODUCTION
Recent nickel-titanium manufacturing processes have resulted in an alloy that remains in a twinned martensitic phase at operating temperature. This alloy has been shown to have increased flexibility with added tolerance to cyclic and torsional fatigue. The aim of this study was to assess the effect of repeated simulated clinical use and… (More)

- Jeffrey R Burroughs, Brian E. Bergeron, Mark D. Roberts, Joseph Hagan, Van T . Himel
- Journal of endodontics
- 2012

INTRODUCTION
The purpose of this study was to determine the shaping ability of 3 nickel-titanium (NiTi) endodontic file systems by measuring canal transportation.
METHODS
Seventy-two S-shaped canals in resin blocks were randomly allocated into 3 groups (n = 24): the Self-Adjusting File (SAF; ReDent Nova, Ra'anana, Israel) group, the Typhoon group (Typhoon… (More)

- Mark D. Roberts
- ArXiv
- 1998

It is argued that colour name strategy, object name strategy, and chunking strategy in memory are all aspects of the same general phenomena, called stereotyping, and this in turn is an example of a knowhow representation. Such representations are argued to have their origin in a principle called the minimum duplication of resources. For most the subsequent… (More)

- Louis J Marconyak, Timothy C. Kirkpatrick, +4 authors Kent A Sabey
- Journal of endodontics
- 2016

INTRODUCTION
The purpose of this study was to evaluate coronal tooth discoloration of ProRoot MTA (Dentsply Tulsa Dental, Johnson City, TN), white ProRoot MTA, EndoSequence Root Repair Material (Brasseler USA, Savannah, GA), MTA Angelus (Angelus Solucoes Odontologicas, Londrina, Brazil), and Biodentine (Septodont, Saint Maur des Fosses, France) when used in… (More)

- Mark D. Roberts
- 1996

It is well known that the relative motion of many particles can be described by the geodesic deviation equation. Less well known is that the geodesic deviation equation can be derived from the second covariant variation of the point particle’s action. Here it is shown that the second covariant variation of the string action leads to a string deviation… (More)

- Mark D. Roberts
- 1999

The field equations of general relativity can be written as first order differential equations in the Weyl tensor, the Weyl tensor in turn can be written as a first order differential equation in a three index tensor called the Lanczos tensor. Similarly in electro-magnetic theory Maxwell’s equations can be written as first order differential equations in… (More)

- Mark D. Roberts
- 2008

A perfect fluid is quantized by the canonical method. The constraints are found and this allows the Dirac brackets to be calculated. Replacing the Dirac brackets with quantum commutators formally quantizes the system. There is a momentum operator in the denominator of some coordinate quantum commutators. It is shown that it is possible to multiply… (More)

- Mark D. Roberts
- 2008

Amethod for finding the world function of Robertson-Walker spacetimes is presented. It is applied to find the world function for the k = 0, γ = 2, solution. The close point approximation for the RobertsonWalker world function is calculated upto fourth order.