restorative Flashcards
give an example of an implant retained fixed and removable prosthesis
fixed - crown, bridge
removable - bar retained or ball retained
how much space is required for an implant from alveolar bone papilla to contact point
4mm
what are common causes of compromised tissue sites for implants
post-extraction defects
trauma
hypodontia
periodontal disease
thin biotype
what are the determinants of aesthetic outcome of implants
bone volume and morphology
space dimensions
3D implant position
biotype
operator skill and experience
what is peri-implant disease
the collective term for inflammatory reaction of tissue surronding osseo-integrated implants - encompasses peri-mucositis and peri-implantitis
what are risk factors for peri-implant disease
poor oral hygiene
poor access to oral hygiene
smoking
previous periodontal disease
poorly controlled diabetes
occlusal forces
what is peri-implant mucositis
inflammation of mucosa surrounding implant, reversible condition caused by poor plaque control, swelling and redness, BOP but no radiographic signs of crestal bone loss
how can peri-implant mucositis lead to peri-implantitis
inflammation is chronic and results in crestal bone loss
what is the prevalence of peri-implant mucositis and peri-implantitis
mucositis - 80% of subjects
implantitis - 28-56%
what is the prevalence of peri-implant mucositis and peri-implantitis
mucositis - 80% of subjects
implantitis - 28-56%
what instructions should be given to patients after implant placement
use CHX mouthwash after surgery
use soft brush until healed, then normal brushing
tailored OHI - superfloss, interdental brushes - provide support and education to patient
smoking cessation if patient smokes
when are extra coronal restorations required
to protect weakend tooth structure
to improve or restore aesthetics
for use as a fixed retainer for bridge work
when indicated by design of RPD
to restore tooth function - increase OVD
what is the results of an over prepared or under prepared tooth for a crown
over prepared - compromises tooth strength and pulpal health
under prepared - poor aesthetics, periodontal and occlusal consequences
what is retention and resistance form in regard to a crown
resistance - prevents dislodgement of restoration by forces in apical or oblique direction or movement of restoration
retention - prevents dislodgement of restoration in path of insertion or long axis of tooth
how is resistance and retention form achieved with an indirect restoration
retention - limited number of path of insertion, opposing walls at a taper of 6 degrees
resistance - longer length of walls, 2mm circumferential parallel dentine before taper begins, just up from margin
what does structural durability mean in regards to crown prep
restoration must contain a bulk of material that is adequate to withstand forces of occlusion
achieved through - occlusal reduction, functional cusp bevel, axial reduction
in regards to the margins of an indirect restoration, what should they be?
should be smooth and fully exposed to cleansing action
should be at a position where dentist can finish them and patient can clean them
placed at gingival margin whenever possible
what is the biological width
junctional epithelium + connective tissue = 2mm
what are the stages in preparation for crown prep
1 - occlusal reduction
2 - separation
3 - buccal reduction
4 - palatal/lingual reduction
5 - should/chamfer finish
6 - check occlusal surface for sufficient clearance
what is a svenson gauge used for
when doing prep to check for sufficient reduction
what must provisional restorations achieve
establish or maintain dental aesthetics
prevent sensitivity
allow optimum home care - cleansible, maintain gingival health, allows for better moisture control at fitting of definitive
prevent microleakage/coronal leakage - maintain vitality
restore function - occlusal stability
what are some ideal characteristics of a provisional restoration
dimensionally stable
non irritant to pulp
adequate mechanical strength
adequate aesthetics
adequate working and setting time
