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Ortho11

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robbypowell's version from 2016-12-08 02:38

retention

Question Answer
define: last phase of orthodontic tx, or phase following "active" ortho treatment, that is aimed at stabilization of the achieved orthodontic correctionRetention
define: the partial or full return of certain characteristics of the pretreatment situation following active treatmentRelapse
gingival and periodontal tissues are effected by ortho tooth mvmt and require time for ______ when the appliance is removedreorganization (this reorganization stops them from trying to return to their previous position)
T/F: the teeth may be in an inherently unstable position after the completion of active ortho treatment, and so need retention to maintain desired relationshipTrue
The most important reason for retention is that changes produced by ______ may alter the orthodontic treatmentGrowth
How long does it take for reorganization of the PDL following active ortho tx?3-4 months*** (for PDL reorganization and stabilization)
How long does it take for reorganization of the collagenous fibers following active ortho tx?4-6 months***
How long does it take for reorganization of the Supracrestal Fibers following active ortho tx>1 year***
teeth require full time retention after comprehensive ortho treatment for the first _________ to _________ months after fixed orthodontic appliance is removed3-4 months
some form of retention should be continued for at least ___ months after active tx and can be reduced to part time wear after the initial _________ to _________ month period12 month (total); 3-4 months (initial, full-time)
T/F: most adults including those who have ortho treatment and have perfectly aligned teeth end up with some crowding on lower incisorsTrue
most adults including those who have ortho treatment and have perfectly aligned teeth end up with some crowding on lower incisors; what is the main contributor to this crowding?late mandibular growth
T/F: Third molar eruption, according to research, has shown to be a causative factor for anterior crowdingFalse
T/F: Third molar eruption do not seem to be causing anterior crowding according to researchtrue
One benefit of _______ retainers (removable/fixed) is that they help restablished normal tissue when gingival hyperplasia is present (common symptom from orthodontic treatment)Removable
______ sensor is a new development that can detect the oral temperature and record how long the patient actually wears the retainer- then when they visit the orthodontist the doc can see how long the pt has actually been wearing itTheraMon
What is the "most frequently used retainer"?Hawley retainer (this may not still be true... im suspicious that trends have changed to lean toward either fixed because of compliance or essix style because of patient preference and familiarity with invisalign)
What type of retainer allows for the most settling of the occlusion (a good thing so long as the relationships are maintained)Wrap-around retainer
_______ retainers normally used in situations where intra-arch instability is anticipated and prolonged retention is plannedFixed
fixed retainer bonded only on the canine need a heavier wire ____ ____ (gauge and material); while fixed retainers bonded to each tooth (canine through canine) using a lighter wire ... which gauge, which wire?28 stainless steel (for canine bonding only); 117.5 braided wire (for bonding to each tooth canine through canine)
Active retainers (not just retention, but applying active force) can be useful for the realignment of irregular _______ (which teeth), to close _____ (major/minor) spaces, and the management of relapse tendencies of class ____ and class ____ with a modified functional appliance(realignment of irregular) incisors, (close) Minor (spaces), & (mgmt of ) Class 2 & Class 3 (tendencies)
after ____ months retention can be discontinued in non growing patients12 months
What type of patients must continue retention for longer than 12 months?growing (all, but esp those with class 2 or 3 tendencies)
T/F: many treated malocclusions require permanent retaining devicestrue (theorem 10)
___ to ___ mm of anteroposterior change frequently occur after treatment of Class 2... those with greater than ___ mm movement anteriorly of lower incisors are considered high relapse tendency Class 2's1-2mm (normal AP change following cessation of active tx, thus indicating over correction); >2mm forward movement of lower incisors during tx (makes patient high risk class 2 relapse)
Recommendations for retention of Class 2 correction: use a _______ at night only in conjunction with a regular retainer, use a _______ appliance to hold both tooth position and occlusal relationship, retention should last longer than usual... from _____ to _____ months total time, depending on the degree of the skeletal problemHeadgear (at night in conjunction with retainer), functional appliance, 12-24 months (need longer retention period)
T/F: Chin cup can be used in as adjunctive retentive device for Class 3 patients with reduced or normal vertical patternsTrue (directs growth in downward rotational sense, increasing vertical height and restricting forward growth of mandible) (contraindicated in patients with excess vertical dimension as it will increase appearance... i.e. Dolicofacial)
following treatment of ____ _____ the goal is to maintain the normal anterior overlap during the retentionDeep bite
following treatment of ____ _____ controlling eruption of the upper molars is the key to retentionopen bite
What are two types of problems that may benefit from headgear wear during retentive phase?Class 2 (probably more balanced or low pull, depending) & Anterior open bite (High pull head gear with conventional retainers)
When using Removable retainers... full-time wear is recommended for the first ____ months and then night-time wear after12 months
Which of the following is NOT an active component of a removable retainer?: acrylic plate, clasps, springs, arches, screws, auxiliariesClasps
This type of retainer is used primarily when posterior teeth were in good position before treatment but maxillary teeth were rotated or poor alignment of mandibular anteriors (without malalignment of posterior teeth)Wrap-Around Clip retainer (3-3 or 4-4)
Which retainer? Esthetics, low cost, and minimal bulk are advantages of this retainer; and disadvantages/limitations are material over the occlusal surface (inhibiting settling), lack of ability to control deepening of the bite, and tendency to need replacementClear Vacuum formed retainer (Essix)
This type of retainer can be used as a finishing device and continue use as a retainer, but is BULKY, does not retain incisor irregularities and rotations as well as others and has a tendency to increase overbitePositioner
What are the 4 main indications for fixed retainers?maintain lower incisor position during late growth (late mand growth between ages 16-20 can cause lower incisor relapse), diastema maintenance (max central incisor diastema), maintenance of a pontic or implant space, compliance concern
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