quiz 6 Flashcards
What is often attributed as a cause for failure of an implant after initial integration?
Bacterial infection, unnatural forces on the implant, poor surgical technique, or poor quality of bone.
Failure of the implant that occurs after the initial integration is often caused by bacterial infection extending from the peri-implant tissues into the bone or overloading of the implant during function, leading to loss of the supporting bone.
What does the ADA Seal of Approval for dentifrices ensure for the consumer?
Abrasives are within safe limits and the paste will prevent cavities.
The ADA Seal indicates that the abrasive particles do not exceed the maximum acceptable abrasiveness, and that scientific data verify claims made by the manufacturer.
What is the purpose of the acrylic resin surgical guide (stent)?
Predetermined holes in the stent allow the surgeon to cut a hole into bone for the implant at the correct angulation.
The surgeon places the stent over the ridge at the time of surgery and inserts a bone-cutting bur through the predetermined holes.
Which factors affect the abrasiveness of polishing agents?
Number of particles utilized, hardness of the material, and speed of the device.
The rate of abrasion is determined by the size, irregularity, and hardness of the particles; the number of particles contacting the surface; and the pressure and speed with which they are applied.
What is correct regarding staining at the margins of composite restorations due to microleakage?
Cannot be polished away.
This staining penetrates under the restoration.
What happens to abrasive particles over time?
They gradually get smaller as they are used.
Unlike the shape of the particle, the size of the particle does not always break down with use.
What conditions can cause failure of an implant after initial integration?
Bacterial infection extending from the peri-implant tissues into the bone or overloading of the implant during function.
This leads to loss of the supporting bone.
What is an allograft?
Tissue taken from a donor (usually deceased) for grafting in another human.
What is an alloplast?
Synthetic graft material.
What is an autograft?
Grafts harvested from the patient’s own body.
What is a xenograft?
Grafts taken from an animal to be used in humans.
What is the purpose of approved denture cleansers?
Loosen stains and plaque.
Immersion of the prosthesis into commercially prepared denture cleansers that loosen stains and deposits that can then be rinsed or brushed away is also appropriate.
What is an acrylic guide essential to proper implant placement called?
Stent.
Often an acrylic resin surgical guide (called a stent) is made ahead of time with holes drilled through it at the same angulation at which the implant should be positioned.
How does prophylaxis paste differ from commercially prepared dentifrice?
It is more abrasive.
Prophy paste may be 20 times more abrasive to dentin and 10 times more abrasive to enamel than commercially prepared dentifrice.
When using hand instruments for margination, where should you begin?
Begin apical to the margin of the restoration, using a shaving motion in diagonal overlapping strokes.
Hand cutting instruments, such as an amalgam knife, scalers and files, or rotary cutting diamonds and carbide burs, are used.
What attaches to the impression abutment to replicate the implant fixture for the laboratory cast?
Implant analog.
The implant analog orients the analog in the cast the same way as the implant fixture is placed in the mouth.
What are the benefits of a properly finished and polished restoration/prosthesis?
Decreased biofilm retention and increased resistance to tarnish and corrosion.
Additional benefits include increased longevity of the restoration, decreased attrition of natural tooth surfaces during chewing, improved esthetics, and improved health of surrounding tissues.
What is pumice primarily used for?
A major component of many prophylaxis pastes used to polish tooth structure, dental amalgam, and acrylic bases.
What is the success rate of dental implants with careful case selection?
More than 90%.
Implants can be used to replace one or more single units as individual crowns or as fixed bridges, or they can support a partial or full denture.
Which of the following is not part of postsurgical instructions for implants?
The area should not be brushed.
What is true concerning safety and infection control during finishing and polishing procedures?
All laboratory wheels and rotary cutting devices should be sterilized or disinfected.
Protective eyewear is highly recommended for the patient and dental team.
Which of the following is not a benefit of polishing a restoration?
Increased attrition of tooth structure.
Which scale ranks materials by their relative resistance to abrasion?
Moh scale.
Diamond has the highest resistance to abrasion and is considered the hardest; pumice rates a 6 on the Moh scale.
