Designs for Class I Lesions Flashcards
Advantages and disadvantages of Sealants/Glass ionomers
Adv. - Conservative, Low cost
Disadv. - Poor longevity
Advantages and disadvantages of PRR/Composite
Adv. - Conservative, Aesthetic
Disadv. - Cost (25% higher), Technique sensitive
Advantages and disadvantages of Amalgam
Adv. - Cost, Longevity
Disadv. - More tooth removed, Mercury alloy
Advantages and disadvantages of Gold
Adv. - Most durable
Disadv. - Highest cost, Fabrication time
What 7 factors affect our treatment recommendations?
- Stress on the tooth
- Aesthetics
- Pt’s out of pocket expenses
- Size of lesion
- Pt’s CRA
- Amount of enamel remaining
- Ability to isolate tooth
3 main indications for Class I amalgam restorations
- Pits and fissures of occlusal surfaces of posterior teeth (Premolars & Molars)
- Pits in the occlusal 2/3 of facial & lingual surfaces of molars
- Lingual pits of maxillary incisors in the top 2/3 of tooth
Define Cavo-surface
The junction between the preparation and uncut enamel
- The outline of the preparation
T or F,
- Avoid making the marginal ridge too thick
- Avoid cutting into the triangular ridges
- False, too thin
2. True
T or F,
- Avoid having the cave-surface end at opposing contacts
- Keep the cave-surface sharp and well-defined
- True
2. True
T or F,
- The outline at the proximal should be perpendicular to the marginal ridge
- Keep the marginal ridge as thin as possible
- False, Parellel
2. False, Thick as possible
Which two groups of teeth should you beware to not cut across the transverse/oblique ridge of when making separate preparations?
- Lower first premolars
2. Upper permanent molars
What are the preparation guidelines for the pupal floor?
- Should be smooth
2. Should be flat or slightly rounded
What is the minimum depth for the pulpal floor?
- Need a minimum of 1.5 mm depth starting from the central groove of amalgam carving.
- Facial and lingual walls at the cave-surface may be deeper closer to 2.0 mm
- *Range of 1.5 to 2.0 mm
May enamel islands remain on the pulpal floor of a prep?
They may remain as long as we are at the minimum depth
If there is decay deeper than the minimum depth, do you remove it first or last?
Last, to avoid spreading decay into the pulpal cavity if there is a pulp breach
In what teeth will the pulpal floor be slanted so as to make it parallel to the plane between the facial and lingual cusps?
Lower first premolars
What is the minimum measurement for the isthmus?
Minimally 1.0 mm