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2025 RHS EXAM PRACTICE EXAM AND STUDY GUIDE
QUESTIONS AND CORRECT ANSWERS (ALREADY
GRADED A+) | LATEST EDITION
Radiolucent - (answers)structures that are less dense and allow radiant energy to
pass through (the dark to grey spots on x-ray)
soft or less dense, tissues and structures allow radiant energy to pass through
includes periodontal ligaments and pulpal tissues
Radiopaque - (answers)portions on radiograph appears light or white
dense structures block or slow the passage of radiant energy
ex: dentin, enamel and bone or metal and resin reinforced restorations
Amalgam Restoration - (answers)A form of dental restoration that uses a
combination of two or more metals, one of which is mercury; a blend of
powdered metal alloy and mercury to produce a restorative material.
because amalgam is mainly composed of metal, radiant energy cannot pass
through it causing the image to appear white or light
form of radipaque
, 2
Inverted Y - (answers)The intersection of the maxillary sinus and the nasal cavity
above canine
appears as radiopaque
Maxillary Sinus - (answers)Large air-filled cavities located above the maxillary
premolar and molar teeth
appear radiolucent on maxillary pre-molar and molar periapical images
the outline of the denser tissue (floor of sinus) appears radiopaque
periapical images - (answers)radiograph that exposes the entire tooth and
surrounding tissues
Nutrient canals - (answers)Small passageways through bone that contain blood
vessels, nerve tissue, and lymphatic tissue that supply the teeth
may appear as radiolucent lines
called pulp tissue once they enter the tooth
, 3
Internal Oblique Ridge - (answers)A radiopaque band that extends downward and
forward from the ramus
When both appear, the external oblique ridge is superior to the internal oblique
ridge
Mandibular Canal - (answers)A radiolucent band outlined by two thin radiopaque
lines that represent the cortical walls of the canal
Alveolar ridge - (answers)Bony ridge that contains the alveoli (tooth sockets)
appears radiopaque
Enamel - (answers)Covers the crown of the tooth and protects the dentin
hardest calcified tissue in the human body
appears radiopaque
Dentin - (answers)Hard portion of the root that surrounds the pulp and is covered
by enamel on the crown and by cementum on the root
, 4
dentinoenamel junction - (answers)Line marking the junction of the dentin and
the enamel
Pulp - (answers)The tissue that contains the blood vessels and nerves of a tooth
radiolucent
Periodontal ligament - (answers)attaches tooth to jaw
X-ray - (answers)a form of electromagnetic radiation used to produce dental
images
ionizing radiation - (answers)enough energy to dislodge electrons from atoms,
forming ions; capable of causing cancer (gamma, X-rays, UV)
Radiation - (answers)Process of emission, transmission, and absorption of radiant
energy
Ionization - (answers)The conversion of a stable atom into an ion that forms an
ion pair
General or braking radiation occurs - (answers)after the timer button is pressed,
when the electrons are pulled from the cathode to the tungsten target
2025 RHS EXAM PRACTICE EXAM AND STUDY GUIDE
QUESTIONS AND CORRECT ANSWERS (ALREADY
GRADED A+) | LATEST EDITION
Radiolucent - (answers)structures that are less dense and allow radiant energy to
pass through (the dark to grey spots on x-ray)
soft or less dense, tissues and structures allow radiant energy to pass through
includes periodontal ligaments and pulpal tissues
Radiopaque - (answers)portions on radiograph appears light or white
dense structures block or slow the passage of radiant energy
ex: dentin, enamel and bone or metal and resin reinforced restorations
Amalgam Restoration - (answers)A form of dental restoration that uses a
combination of two or more metals, one of which is mercury; a blend of
powdered metal alloy and mercury to produce a restorative material.
because amalgam is mainly composed of metal, radiant energy cannot pass
through it causing the image to appear white or light
form of radipaque
, 2
Inverted Y - (answers)The intersection of the maxillary sinus and the nasal cavity
above canine
appears as radiopaque
Maxillary Sinus - (answers)Large air-filled cavities located above the maxillary
premolar and molar teeth
appear radiolucent on maxillary pre-molar and molar periapical images
the outline of the denser tissue (floor of sinus) appears radiopaque
periapical images - (answers)radiograph that exposes the entire tooth and
surrounding tissues
Nutrient canals - (answers)Small passageways through bone that contain blood
vessels, nerve tissue, and lymphatic tissue that supply the teeth
may appear as radiolucent lines
called pulp tissue once they enter the tooth
, 3
Internal Oblique Ridge - (answers)A radiopaque band that extends downward and
forward from the ramus
When both appear, the external oblique ridge is superior to the internal oblique
ridge
Mandibular Canal - (answers)A radiolucent band outlined by two thin radiopaque
lines that represent the cortical walls of the canal
Alveolar ridge - (answers)Bony ridge that contains the alveoli (tooth sockets)
appears radiopaque
Enamel - (answers)Covers the crown of the tooth and protects the dentin
hardest calcified tissue in the human body
appears radiopaque
Dentin - (answers)Hard portion of the root that surrounds the pulp and is covered
by enamel on the crown and by cementum on the root
, 4
dentinoenamel junction - (answers)Line marking the junction of the dentin and
the enamel
Pulp - (answers)The tissue that contains the blood vessels and nerves of a tooth
radiolucent
Periodontal ligament - (answers)attaches tooth to jaw
X-ray - (answers)a form of electromagnetic radiation used to produce dental
images
ionizing radiation - (answers)enough energy to dislodge electrons from atoms,
forming ions; capable of causing cancer (gamma, X-rays, UV)
Radiation - (answers)Process of emission, transmission, and absorption of radiant
energy
Ionization - (answers)The conversion of a stable atom into an ion that forms an
ion pair
General or braking radiation occurs - (answers)after the timer button is pressed,
when the electrons are pulled from the cathode to the tungsten target
