Pins and wells Flashcards
Rule for cusp capping
Less than one have: no cap
1/2-2/3: consider cap
More than 2/3: cap
Replacing cusps
2 rules
primary groove to cusp tip is more than 2/3 or if extension is more than 2/3 distance between cusps
Complex amalgan restorations used as (3)
Definitive restoration Foundation Restoration Control restoration -Pulpal question -Periodontal questions -acute caries -sever caries
Types of pins
cemented (smaller than hole)
friction locked
threaded
What type of pin do we use
threaded Minim (Max.021 drill, .024 pin) Slide 14
2-2-2-2
2mm pin hole depth
2 drill diameters inside DEJ
2mm length of pin
2mm amalgam over pin
Purpose of matrix bands
Wall against which to condense Establish proximal contact Isolation during fill Containment of amalgam Prevents voids Shape proximal contours
Parts of tofflemire retainer
Head
Slide
Rotating spindle
Set screw
Filling amalgam
Proximal areas Oclussal areas overfill anatomical burnisher marginal ridge, occlusal embrasure excess flash remove matrix band Evaluate voids Define grooves, smooth ridges remove dam evaluate occlusion
Amalgam at osu
Permite C
high copper
Admixed
Zn containing
Pins are used for this form
retention form
Advantages of quandrant dentistry
Less appointments
Less discomfort
See more patients
Considerations of Quadrant dentistry
Increased chairside time
Indications of Quadrant
Multiple lesions
Sedation needed
Contraindications
Lack of experience
Patient with TMJ or reclining problems
