The SLSA program is based on current, referenced literature and consists of 40 questions, answers, rationales and references. Answers appear in the following issue at the end of each quiz.
Dentists who complete the 15 question quiz in the November, 2009 issue of Oral Health may be eligible to receive continuing education points. The names and license numbers of all who complete the quiz will be forwarded to their respective provincial licensing authorities.
QUESTION 37
C & B Metabond (methylmethacrylate and acrylic resin) is the cement of choice for
1. bonded posts in endodontically treated teeth.
2. resin bonded bridges.
3. fractured porcelain on porcelain fused to metal bridges.
4. porcelain veneers.
A. 1, 2, 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All of the above.
Rationale
C & B Metabond is the cement of choice for non-precious metals, such as resin bonded bridges and bonded posts in endodontically treated teeth. It bonds to enamel, dentin and metal. This cement is invaluable for patients who present with fractured porcelain and exposed metal on porcelain fused to metal restorations.
The resin-luting cement, Nexus 3, is ideal for cementing porcelain veneers as it is available in a number of shades and viscosities. This cement can be light-or dual-cured.
REFERENCE
1. Zarb, J. P. How can I limit the number of different cements available in my dental practice and still be able to address all prosthetic clinical situations? JCDA 73 : 697 -698, 2007.
QUESTION 38
In the specific plaque hypothesis for development of periodontal disease
1. a limited group of organisms is involved.
2. infection depends on the concentration of periodontal pathogens.
3. reaction varies according to virulence of organisms.
4. the host’s immune response modulates the reaction .
A. 1, 2, 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All of the above.
Rationale
According to the currently accepted theory of the development of periodontal disease, known as the specific plaque hypothesis, only a limited group of bacteria has the capacity to cause periodontitis. The occurrence of infection depends on there being a sufficient concentration of periodontal pathogens and these pathogens must express virulence factors. A person can harbour these pathogens without presenting any clinical symptoms. Symptoms appear only if the host’s defense mechanisms are no longer able to maintain homeostasis, and the host’s immune response modulates disease progression toward destruction.
REFERENCE
1. Bidault, P., Chandad, F. and Grenier, D. Risk of bacterial resistance associated with systemic antibiotic therapy in periodontology. JCDA 73 : 721 -725, 2007.
QUESTION 39
Possible cause(s) of sleep bruxism is/are
1. stress.
2. psychosocial factors.
3. anxiety.
4. excessive response to microarousals.
A. 1, 2, 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All of the above.
Rationale
The pathophysiology of sleep bruxisim is not completely understood, but possible causes range from psychosocial factors (e. g. stress and anxiety) to excessive response to microarousals. Microarousals are defined as brief (three to 15 sec.) periods of cortical activation during sleep, which are associated with increased activity of the sympathetic nervous system.
REFERENCE
1. Huynh, N., Manzini, C., Rompr, P. et al. Weighing the potential effectiveness of various treatments for sleep bruxism. JCDA 73 : 727 -730, 2007.
QUESTION 40
In a patient with HIV, the increased risk to malignancy is related to
1. immunosuppression.
2. coviral infection.
3. exposure to carcinogens.
4. the activity of the HIV transactivator of transcription protein.
A. 1, 2, 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All of the above.
SS L
A
Rationale
Advances in the management of HIV infection have resulted in significant changes in survival and in the prevalence and incidence of oral diseases in persons so infected. The increased risk to malignancy is related to immunosuppression and the activity of the HIV transactivator of transcription protein, coviral infection and exposure to carcinogens. It is the dentist’s role to detect early changes in the mucosa that lead to a diagnosis of cancer and to maintain the patient’s oral and dental health.
REFERENCE
1. Epstein, J. Oral malignancies associated with HIV. JCDA 73 : 953 -956, 2008.
Answers to the September 2009 SLSA questions:
33. A
34. C
35. B
36. B
Coming in the November 2009 issue of Oral Health:
The 15-question quiz for CE points!
Answer the questions, return the quiz card as instructed by December 31, 2009 and collect valuable CE points!
