Exam 26: Root Morphology and Instrumentation Implications

When permanent teeth have more than one root,there is a portion of the root called the root trunk.The root trunk is between the furcation and the apical foramen.

What term is used specifically for the bone between the roots of a molar?

Which of the following single-rooted teeth has the most convergence or taper of the proximal root surfaces toward the lingual?

All teeth are positioned in the dental arches so that their crowns are oriented or slanted more toward the mesial side and their roots have a more distal orientation except which of the following?

Which of these teeth do not have a furcation on the mesial surface?

The root trunk on which aspect of a maxillary first molar is the longest?

Which of the following teeth is most likely to have a facial and a lingual root?

If a tooth with one root were to lose one third of its attachment length,its loss of attachment surface would be greater than one third because the root is larger in the cervical one third of the tooth.

Which of these teeth have two roots?

Which of the following general statements about the root of a single-rooted tooth is correct?

Dentinal hypersensitivity may occur as a result of the removal of cementum during root instrumentation.The goal of root instrumentation is to remove all cementum.

How many distal root surfaces are there from a facial approach on a maxillary first molar?

CASE STUDY Monica is a 38-year-old woman who visits the office as a new client for an oral assessment and necessary care.Her health history indicates that she is in good health.Monica reports that she brushes three times per day and flosses every night,but her gums bleed every time she flosses.On completion of the full mouth radiographs,dentist's examination,and diagnosis,the dental hygienist completes the periodontal assessment and dental hygiene care plan.Findings include generalized,papillary and marginal gingival erythema;edema;and increased bleeding on probing at all proximal surfaces,especially teeth 8 and 9.No visible supragingival calculus is observed,but there is flat,easily explorable subgingival calculus present on all proximal surfaces,and there are rings of subgingival calculus in 4-mm pocket depths on the lingual surfaces of the mandibular molars,especially teeth 30 and 31.Furthermore,tooth 14 has facial and lingual recession of 4 mm,circumferential 3-mm pocket depths,a Class I mesial furcation,and cementum that is grainy and soft. -Access to and instrumentation on the lingual aspect of teeth 30 and 31 is complicated by what anatomic feature?

CASE STUDY Monica is a 38-year-old woman who visits the office as a new client for an oral assessment and necessary care.Her health history indicates that she is in good health.Monica reports that she brushes three times per day and flosses every night,but her gums bleed every time she flosses.On completion of the full mouth radiographs,dentist's examination,and diagnosis,the dental hygienist completes the periodontal assessment and dental hygiene care plan.Findings include generalized,papillary and marginal gingival erythema;edema;and increased bleeding on probing at all proximal surfaces,especially teeth 8 and 9.No visible supragingival calculus is observed,but there is flat,easily explorable subgingival calculus present on all proximal surfaces,and there are rings of subgingival calculus in 4-mm pocket depths on the lingual surfaces of the mandibular molars,especially teeth 30 and 31.Furthermore,tooth 14 has facial and lingual recession of 4 mm,circumferential 3-mm pocket depths,a Class I mesial furcation,and cementum that is grainy and soft. -The dental hygienist completes the instrumentation of the Class I furcation on the mesial aspect of tooth 14 from the lingual approach.What anatomic feature allows for this lingual access?

CASE STUDY Monica is a 38-year-old woman who visits the office as a new client for an oral assessment and necessary care.Her health history indicates that she is in good health.Monica reports that she brushes three times per day and flosses every night,but her gums bleed every time she flosses.On completion of the full mouth radiographs,dentist's examination,and diagnosis,the dental hygienist completes the periodontal assessment and dental hygiene care plan.Findings include generalized,papillary and marginal gingival erythema;edema;and increased bleeding on probing at all proximal surfaces,especially teeth 8 and 9.No visible supragingival calculus is observed,but there is flat,easily explorable subgingival calculus present on all proximal surfaces,and there are rings of subgingival calculus in 4-mm pocket depths on the lingual surfaces of the mandibular molars,especially teeth 30 and 31.Furthermore,tooth 14 has facial and lingual recession of 4 mm,circumferential 3-mm pocket depths,a Class I mesial furcation,and cementum that is grainy and soft. -What is the most likely anatomic cause of the clinical findings at teeth 8 and 9?

Which of the following statements about furcations is false?

The proximal surfaces of roots that are narrower on the lingual than on the facial surface are more readily approached from the lingual aspect because there is more proximal space there for the adaptation of instruments.

The cementoenamel junction (CEJ)has the most proximal incisal or occlusal curvature on which of the following teeth?

Which of the following statements about the clinical crown of a tooth is true?

The name of the condition in which teeth within an arch are so crowded that two adjacent teeth contact each other on the root and are connected by cementum is: