Operative 2 Midterm Flashcards

Question

When would you use auxiliary retentive features with class III preps?

Answer 1

When incisal and gingival walls are significantly diverging

Answer 2

Margin should extend into facial embrasure enough to break facial contact Should see light through facial margin area Faciolingually the lesion is about halfway through the tooth but sometimes you may see light and the prep still may not be halfway through the tooth Larger lesion may require further facial extension

Answer 3

The extent of the lesion Gingival contact needs to be broken

Answer 4

Gingival contact = open Incisal contact = maintained

Answer 5

Inciso-gingivally: 1.5 - 2.0 mm (from midpoint of contact to gingival margin) Axial wall: 1.25 - 1.5 mm deep at incisal 1.0 - 1.25 mm deep at gingival 0.5 mm into dentin Depth of facial wall for central incisor on dentoform (the one we did for practical) Incisal: 1.5 mm Gingival: 2 mm Extension Half way through the marginal ridge

Answer 6

Contrast Effect: visual phenomena that creates optical illusion difficult to decipher

Answer 7

Value Darker background = tooth will look lighter Lighter background = tooth looks darker Hue Use a neural background when selecting color Chroma Use a background with a lower chroma relative to the shade of the tooth so color is more intense and easier to distinguish Areal Large teeth appear lighter and light teeth appear larger Small teeth appear darker and dark teeth appear smaller Spatial Recessed teeth appear darker Protrusive teeth appear lighter Successive When one color is viewed immediately after another and afterimage often will appear PIC

Answer 8

Take a good picture before starting the color matching process Balance lighting and appropriate shade matching environment (gray or pastel color walls/cabinets (constant illumination 5,500K)) Pt. No lipstick or bright colored clothes Clean teeth - prophy when stains are present Shade match at the beginning of the visit when teeth are are hydrated View at eye level so that the most color-sensitive part of the retina is used. Distance of 10 inches Tooth and shade tab with different surface characteristics so wet the surface of both. Shade matching should be made quickly less than 5 seconds Be sure to put it on the same plane Ex. in image below we want to mimic right image Rest eyes between viewing by focusing on neutral gray surface When selecting appropriate hue Compare with canine since it has the highest chroma of dominate hue (thick dentin) Select 2 or 3 shade tabs as quickly as possible. Then 1 or 2 shade tabs should be reselected Measure color with restorative material that will be used for the actual restoration

Answer 9

Shade match at the beginning of the visit when teeth are are hydrated

Answer 10

Rest eyes between viewing by focusing on neutral gray surface Shade matching should be made quickly less than 5 seconds

Answer 11

Look at and READ the pictures of these

Answer 12

Add a gingival floor with a rounded axio-gingival line angle and a bevel all the way around the prep Should look like a shallow “S” when looking at it straight on Facial margin bevel = 1.5 mm wide Lingual bevel = 1 mm wide 35-45° bevel Retention groove at axio-gingival line angle Retentive incisal point Gingival contact is broken and gingival margin is just into gingival embrasure Distance from incisal edge to gingival floor = 6mm Adjacent tooth to axial wall = 2mm at contact area Lingual margin is located distal to marginal ridge

Answer 13

Concave fracture = occurs when the incisal edge fractures and joins a previous large class III lesion Round bur at high speed is used to prep the cavity Connect the class III with the incisal fracture Remove weakened enamel that will be in occlusion Retain undermined facial enamel Make gingival floor relatively flat and perpendicular to long axis Add your 2 retention grooves DON'T add pins

Answer 14

Class IV (??) Horizontal Occurs from trauma to tooth Pulp exposure may or may not be involved Clean up fracture and add a bevel all the way around Diagonal/Oblique Occurs from trauma to the tooth This is the fracture we simulated in lab Concave Broken incisal edge connects to previous class III

Answer 15

Dentin shades = block out the darkness of the mouth Enamel shades = lifelike translucency and color to the restoration Translucent shade = creates natural looking incisal edge

Answer 16

35-45° bevel PIC

Answer 17

Indications Class I, Class II, Class III and Class V restorations Deep posterior restorations Posterior restorations with subgingival interproximal preparations that are difficult to isolate or where no enamel remains Clinical Benefits Reduce postoperative sensitivity Pulpal protection from irritation Fluoride release over time Helps prevent demineralization Reduced microleakage compared to composite only Zone of inhibition next to the lass ionomer

Answer 18

The sandwich of glass ionomer (GI) cement, dental adhesive and resin composite is an effective technique that optimally combines the desirable properties of the restorative materials. In the sandwich technique, the GI is placed as a liner or base, followed by placement of a resin composite to provide an aesthetic restoration of the remaining cavity.

Answer 19

Contains polyacrylic acid (20%) and aluminum chloride hexahydrate (3%) which removes the smear layer but is not acidic enough to significantly alter the calcium content of the tooth structure Do NOT use typical etch and bond for glass ionomer

Answer 20

Place rubber dam to avoid moisture contamination Roughen enamel surface with a diamond but to achieve better adhesion of the composite Add tetric evoceram composite in the shade BL on the mesio-facial of the tooth, blend mesially to create the int. Proximal contour and the facial portion of the contact point. Cure Mopper Pop - light cure for 3 seconds, gently separate #8 and #9 afterwards. Add a mylar strip and apply a rice size composite on the lingual surface. CURe. Pull the mylar strip out slowly towards the buccal Contour with a football bur and/or discs to form the mesio-facial line angle. Polish

Answer 21

Location Size width/length ratio Shape of proximal disatema Shade selection

Answer 22

Midline diastema = usually more difficult and involves 2 teeth Non-midline diastema = usually involves one tooth Midline radiographs will help is diagnosing midline pathology

Answer 23

Normal developing dentition Physiologic median diastema/ ugly duckling stage -Between 8-9 yrs old self-correcting malocclusion -- Particularly during eruption of permanent canines - as they erupt they displace the roots of lateral incisors mesially and → causes midline spacing Tooth material deficiency Microdontia Macrognathia Missing laterals Extracted tooth Physical impediment Retained deciduous Mesiodens Abnormal labial frenum Midline pathology Habits Thumb sucking Tongue thrusting

Answer 24

A space greater than 0.5 mm between the proximal surfaces of adjacent teeth