DHY 121 Oral Histology and Embryology

Campus Location:
Dover, Wilmington
Effective Date:
BIO 120, SSC 100 or concurrent


Course Credits and Hours:
2.00 credits
2.00 lecture hours/week
1.50 lab hours/week
Course Description:

The course covers the oral mucosa, the periodontium, dental tissues, the tongue, and salivary glands. Emphasis is placed on microscopic features of these oral tissues as they relate to their clinical characteristics, their functions, and their embryologic development.

Required Text(s):

Obtain current textbook information by viewing the campus bookstore online or visit a campus bookstore. Check your course schedule for the course number and section.

Additional Materials:

Dental Hygiene Policy and Procedures Manual
Allied Health/Science Department Program Student Policy Manual
Colored pencils
Large three-ring notebook

Schedule Type:
Classroom Course


Core Course Performance Objectives (CCPOs):
  1. Differentiate among the various oral tissues in terms of their clinical characteristics, functions, composition, and microscopic structures. (CCC 1, 2, 4, 5, 6; PGC 1, 5)
  2. Describe the embryonic development of the face, oral cavity, and teeth. (CCC 1, 2, 4, 5, 6; PGC 1, 5)

See Core Curriculum Competencies and Program Graduate Competencies at the end of the syllabus. CCPOs are linked to every competency they develop.

Measurable Performance Objectives (MPOs):

Upon completion of this course, the student will:

  1. Differentiate among the various oral tissues in terms of their clinical characteristics, functions, composition, and microscopic structures.
    1. Describe the architectural arrangement of the periodontium.
    2. Identify the surface anatomical landmarks and regions of the gingiva and other designated structures of the oral cavity.
    3. Differentiate among the various types of oral mucosa on the basis of clinical and microscopic features.
    4. Describe the clinical characteristics of healthy gingiva, including the range of variation.
    5. Indicate the clinical and microscopic characteristics of the dentogingival junction, periodontal ligament, and alveolar bone.
    6. Compare the clinical and microscopic characteristics of the four dental tissues.
    7. Distinguish among the salivary glands and their microscopic components.
    8. Relate microscopic features of the various oral tissues to their respective clinical characteristics and functions.
    9. Identify the oral tissues and their components on a diagram, photomicrograph and/or microscopic slide.
  2. Describe the embryonic development of the face, oral cavity, and teeth.
    1. Summarize the main events preceding orofacial development.
    2. Name the germ layers and their tissue derivatives.
    3. Identify the various embryonic structures involved in orofacial development and their derivatives.
    4. Explain the six principal events required for normal tooth development.
    5. Identify the parts of the tooth germ and their tissue derivatives.
    6. Describe the correct sequence of inductive interactions that occur during tooth development.
    7. Discuss the phenomenon of tooth eruption.
    8. Identify the embryonic structures on a diagram, photomicrograph, and/or microscopic slide.
Evaluation Criteria/Policies:

The grade will be determined using the Delaware Tech grading system:

90 100 = A
80 89 = B
70 79 = C
0 69 = F

Students should refer to the Student Handbook for information on the Academic Standing Policy, the Academic Integrity Policy, Student Rights and Responsibilities, and other policies relevant to their academic progress.

Core Curriculum Competencies (CCCs are the competencies every graduate will develop):
  1. Apply clear and effective communication skills.
  2. Use critical thinking to solve problems.
  3. Collaborate to achieve a common goal.
  4. Demonstrate professional and ethical conduct.
  5. Use information literacy for effective vocational and/or academic research.
  6. Apply quantitative reasoning and/or scientific inquiry to solve practical problems.
Program Graduate Competencies (PGCs are the competencies every graduate will develop specific to his or her major):
  1. Collect and analyze baseline data in a critical and scientific manner regarding the patient's health status to determine dental hygiene treatment needs.
  2. Utilizing professional communication skills and behaviors, initiate and responsibly advocate health care promotion and disease prevention for diverse populations.
  3. Provide dental hygiene care in a safe manner.
  4. Utilizing self-assessment skills, evaluate clinical performance and the effectiveness of dental hygiene treatment.
  5. Accurately document information related to dental hygiene care through proper record keeping.
  6. Recognize and manage the professional and ethical issues of dental hygiene practice in a dynamic environment.
Disabilities Support Statement:

The College is committed to providing reasonable accommodations for students with disabilities. Students are encouraged to schedule an appointment with the campus Disabilities Support Counselor to request an accommodation needed due to a disability. A listing of campus Disabilities Support Counselors and contact information can be found at the disabilities services web page or visit the campus Advising Center.

Minimum Technology Requirements:
Minimum technology requirements for online, hybrid, video conferencing and web conferencing courses.