B.The canal is wet C.There is no sinus tract. D.There is no foul odor. E.The temporary filling is intact 37 Which one is not the pathways of pulpal and periapical infections? A.Dentinal tubules B.Pulp exposure C. Gingival D.Periodontal ligament E.Anachoresis 38 Tug-back is achieved and the canal is ready for filling A. When the gutta-percha has extended beyond the apex B.When the gutta-percha is easily removed from the root canal C.When the gutta-percha placed to apical constriction exhibits resistance on removal D.After cementation E.None ofabove 39 Most root canal infections involve A.a single obligate anaerobic species B.multiple anaerobic species only C.mixed aerobic and anaerobic microorganisms D.multiple aerobic species only E.none ofabove 40 An abnormally shaped tooth that may appear as an extra wide crown,a normal crown with an extra root,or other combinations resulting from the union of two adjacent tooth germs by dentin during development is called A.fused teeth B.concresence of teeth C.geminated teeth D.dilacerations of tooth E.taurodontism 41 Which isn't the non-operative treatment of dental caries in the following? A.application of fluoride B.application of APF gel C.remineralizative therapy D.enameloplasty E.pit and fissure sealing 42 Which is not the aim of operative therapy on the dental caries management?
B. The canal is wet. C. There is no sinus tract. D. There is no foul odor. E. The temporary filling is intact 37 Which one is not the pathways of pulpal and periapical infections? A. Dentinal tubules B. Pulp exposure C. Gingival D. Periodontal ligament E. Anachoresis 38 Tug-back is achieved and the canal is ready for filling A. When the gutta-percha has extended beyond the apex B. When the gutta-percha is easily removed from the root canal C. When the gutta-percha placed to apical constriction exhibits resistance on removal D. After cementation E. None of above 39 Most root canal infections involve A. a single obligate anaerobic species B. multiple anaerobic species only C. mixed aerobic and anaerobic microorganisms D. multiple aerobic species only E. none of above 40 An abnormally shaped tooth that may appear as an extra wide crown, a normal crown with an extra root, or other combinations resulting from the union of two adjacent tooth germs by dentin during development is called A. fused teeth B. concresence of teeth C. geminated teeth D. dilacerations of tooth E. taurodontism 41 Which isn’t the non-operative treatment of dental caries in the following? A. application of fluoride B. application of APF gel C. remineralizative therapy D. enameloplasty E. pit and fissure sealing 42 Which is not the aim of operative therapy on the dental caries management?
A.To remove infected dentine and prohibit caries B.To protect the pulp and avoid pain C.To enhance the strength of the tooth D.To facilitate plaque control E.To restore the appearance(of teeth)and its function 43 Which is the best statement about resistance form A.Resistance form is the design of a cavity in such a way that the remaining tooth substance and the restorative material can withstand masticatory stress B.The bulk required will depend on the flexural strength of restorative material.In the case of amalgam it is estimated that a minimum of 1.5-2mm thickness of the restorative material is required to withstand masticatory stress C.If a marginal ridge is found to be too weak in the cause of an occlusal cavity preparation,a Class II cavity may have to be prepared instead,so as to eliminate the weak marginal ridge.This is particularly indicated where the ridge is only of enamel thickness and unsupported by sound dentine D.The cavity should be designed that the occlusal margins of the cavity are in areas not subjected to excessive occlusal trauma,otherwise the enamel wall of the cavity and/or the margins of the restorative material may fracture.In practice,this may be achieved by placing an occlusal margins of a cavity about one-quarter (1/4)of the intercuspal distance.Note,that efforts should always be made to conserve sound tooth tissue E.All of the above 44 Which is the most danger area of tooth in dental caries occurred after you have learned dental caries? A.Pits and fissures on occlusal surfaces of molars and premolars B.Approximal surfaces of all teeth. C.Gingival thirds of all teeth,both on facial and lingual surfaces D.Pits and fissures near the lingual of maxillary incisors and canines (lingual pits) E.Pits and fissures on the buccal of molars 45 Which is not true in the following statement about dental caries and micro-organisms? A.Caries could be induced by specific bacteria,especially mutans streptococci-group (eg.Streptococcus mutans and Strep.sobrinus). B.There are caries occurred when only fed a cariogenic (high sucrose)diet. C.In the '60s Keyes infected germ-free animals with known strains of streptococci and found that these organisms were transferred to uninfected litter mates who then became susceptible to caries.He thus demonstrated that dental caries was potentially infectious and transmissible. D.When talking about cariogenic microorganisms,we often refer to Streptococcus mutans,Lactobacillus and Actinomyces. E.Occlusal caries could be prevented using penicillin in animal study
A. To remove infected dentine and prohibit caries B. To protect the pulp and avoid pain C. To enhance the strength of the tooth D. To facilitate plaque control E. To restore the appearance (of teeth) and its function 43 Which is the best statement about resistance form A. Resistance form is the design of a cavity in such a way that the remaining tooth substance and the restorative material can withstand masticatory stress B. The bulk required will depend on the flexural strength of restorative material. In the case of amalgam it is estimated that a minimum of 1.5-2mm thickness of the restorative material is required to withstand masticatory stress C. If a marginal ridge is found to be too weak in the cause of an occlusal cavity preparation, a Class II cavity may have to be prepared instead, so as to eliminate the weak marginal ridge. This is particularly indicated where the ridge is only of enamel thickness and unsupported by sound dentine D. The cavity should be designed that the occlusal margins of the cavity are in areas not subjected to excessive occlusal trauma, otherwise the enamel wall of the cavity and/or the margins of the restorative material may fracture. In practice, this may be achieved by placing an occlusal margins of a cavity about one -quarter (1/4) of the intercuspal distance. Note, that efforts should always be made to conserve sound tooth tissue E. All of the above 44 Which is the most danger area of tooth in dental caries occurred after you have learned dental caries? A. Pits and fissures on occlusal surfaces of molars and premolars B. Approximal surfaces of all teeth. C. Gingival thirds of all teeth, both on facial and lingual surfaces D. Pits and fissures near the lingual of maxillary incisors and canines (lingual pits) E. Pits and fissures on the buccal of molars 45 Which is not true in the following statement about dental caries and micro-organisms? A. Caries could be induced by specific bacteria, especially mutans streptococci-group (eg. Streptococcus mutans and Strep. sobrinus). B. There are caries occurred when only fed a cariogenic (high sucrose) diet. C. In the ’60s Keyes infected germ-free animals with known strains of streptococci and found that these organisms were transferred to uninfected litter mates who then became susceptible to caries. He thus demonstrated that dental caries was potentially infectious and transmissible. D. When talking about cariogenic microorganisms, we often refer to Streptococcus mutans, Lactobacillus and Actinomyces. E. Occlusal caries could be prevented using penicillin in animal study