Aesthetics Flashcards
The changes in angulation of a tooth as it emerges from the gingiva
Emergence profile
What will happen if you over contour a mesial restoration on tooth 21?
You may unintentionally create a diastema and the tooth will appear asymmetric
What will happen if you under-contour the mesial aspect of tooth 21?
Can lead to an overhanging ledge which may become a plaque trap
What is an occlusal can’t?
The vertical position of the teeth when the left and right sides are different
The visual relationship between your upper gums,lips and teeth
Smile line
If someone has a high smile line, how will this appear?
The upper labial gingiva can be seen when smiling
If someone has a low smile line, how will this appear?
Upper lip will conceal gingiva when smiling
What is the buccal corridor?
The black area hat can be seen in the corners of your mouth when you smile
What is gingival zenith?
The most apical aspect of free gingival margin
How many lobes do central incisors have?
3
What are the three prominent features of central incisor tooth anatomy?
- lobes
- development grooves
- transitional line angles
What three factors is shade selection of composite aesthetics based on?
- hue
- chroma
- value
Where in the mouth would you compare the shade tab to to ascertain the hue?
To the cervical area of the tooth or the canine
When selecting shade for teeth, what is important to do?
- take shade of moist teeth
-take shade from middle 1/3 of tooth
What is the benefit of using retraction cord?
Allows for clear peripheral margins for lesions to be established
And
Enhances haemostasis during restoration phase
Why is it good practice to use a rubber dam?
Ensures optimum moisture control and dramatically reduces the risk of foreign body aspiration
Why is a small round diamond bur ideal to use in anterior cavity prep?
To minimise tooth structure loss in small cavities
In what situation may use of a matrix band between anterior central incisors not be feasible?
When there is a large diastema or if a patient is in the mixed dentition
What are the two main advantages to using a crown form?
- less intra oral clinical time required
- easy to achieve a smooth glossy finish
What are the three main disadvantage to using crown forms?
- be weary of composite overhangs
- can be time consuming
- every tooth is unique so a significant amount of characterisation is required
What direction should you apply gentle tension to the matrix strip to help create a nice contact point?
Coronal direction
What would happen if you pulled the matrix band in apical direction?
Will create an unintentional diastema
Why is placing a hole at the incisal angle of the crown a good idea?
It allows excess material to extrude and helps prevent the formation of air bubbles and voids
In what situation would a full crown form be used over a sectional crown form?
When there is a more substantial fracture
How does the enamel appear in young patients?
Milk white and translucent
As we age, what does enamel look like on anterior teeth?
Thins and tooth appears less monochromatic
What are developmental grooves on central and lateral incisors?
Grooves that divide the lobes and run parallel to the long axis of the tooth
Why is the cervical area of the canine the best tooth to compare with a shade tab to ascertain the hue of a tooth?
It has the highest density of dentine
what is the golden proportion ratio?
0.618
If the holes in a rubber dam are punched too close together, what could happen?
Holes pull away from the teeth causing spacing and leakage
If the holes in a rubber dam are punched too far apart, what could happen?
Rubber dam bunches between the teeth
If the holes in a rubber dam are punched too low, what could happen?
Rubber dam covers the patients nose
If the holes in a rubber dam are punched too high, what could happen?
Rubber dam does not extend over the upper lip
How can an invisible transition between the tooth surface and restoration of an anterior tooth be achieved?
- Having a bevel
- Polishing the enamel with soflex discs to remove loosely bound enamel rods
What is the black soflex disc used for?
Gross removal of composite resin
What is the purple soflex disc used for?
Remove imperfections and finishing
What is the green soflex disc used for?
Polishing
What is the pink soflex disc used for?
Fine polish to give lustre
