Tikrit University College Of Dentistry Dr Reem Ahmed-PDF Free Download

Tikrit University College of Dentistry Dr Reem Ahmed
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Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, Lingual bar lingual plate major connectors are used in the majority of . removable partial denture applications Double lingual bar and labial bar . major connectors are used for special applications in which lingual bars . and lingual plates are contraindicated , , 1 lingual bar. Is the most frequently used mandibular major connector because of its . simplicity in design and construction , Indication . It is the first choice major connector should be used whenever the . functional depth from free gingival margin to the lingual vestibule . equal or exceed 8mm , Design , 1 the bar should be half pear shaped in cross section superior inferior . dimension is 5 mm and 2 mm in thickness , 2 the superior border of the bar should be located at least 3 mm from .
the gingival margins of all adjacent teeth , 3 the inferior border placed at the functional depth of the lingual . vestibule , 4 relif of the tissue surface of the bar is necessary . cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, Advantages , 1 the simplest mandibular major connector with highest patient . acceptance , 2 it does not cover the teeth or the gingival tissues.
disadvantages , If it is not properly designed it may not be rigid . 2 lingual plate, Half pear shaped lingual bar with a thin solid piece of metal extending . from its superior border this thin projection of metal is carried onto the . lingual surfaces of the teeth and presents a scalloped appearance . The inferior border of a lingual plate should be positioned as low in the . floor of the mouth as possible but should not interfere with the . functional movements of the tongue and soft tissues . The superior border of a lingual plate must be contoured to intimately . contact the lingual surfaces of the teeth above the cingula . , cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, Indications , 1 used when there is insufficient vertical space for a lingual bar distance . from free gingival margin to floor of the mouth less than 8mm . 2 when there is gingival recession high muscle attachments or high . frenum attachments on the lingual aspect of the mandibular arch . 3 when the remaining teeth have lost much of their periodontal support . and require splinting Lingual plate used to stabilize the remaining teeth . and to distribute applied forces over the remaining teeth and soft tissue . 4 lingual tori is present , advantages, 1 The most rigid mandibular major connector .
2 It gives indirect retention to the partial denture . 3 Deflect food from impacting on lingual tissues . 4 Provide resistance against horizontal or lateral forces . 5 Permits the replacement of lost teeth without remaking the partial denture . 6 Help in splinting and prevent upper eruption of the anterior teeth. Disadvantages , In patient with poor oral hygiene lingual plate extensive coverage may . contribute to decalcification of enamel surfaces and irritation of the soft . tissue in patients with poor oral hygiene , 3 Double lingual bar with cingulum bar. Indications , 1 When indirect retention is required . cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, 2 When periodontally affected teeth that require splinting are present .
Design , 1 It is made of two bars cingulam bar Kennedy bar and the conventional . lingual bar A rigid minor connector at the embrasure between the . canine and first premolars joins the two bars Rests are placed at each . end of the upper bar attached to the minor connector . 2 The lower bar has the same design as a single lingual bar . 3 The upper bar is scalloped and half oval in cross section 2 3 mm high . and 1 mm thick at its greatest diameter , Advantages. 1 provide indirect retention , 2 contribute to horizontal stabilization. 3 no gingival margin coverage , DISADVANTAGES , 1Tongue annoyance. 2 food impaction if the upper bar is not intimate contact with the teeth . 4 Cingulum bar, cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab.
Lec 6 prosthodontics 3rd class, Indications, 1 height of activated lingual frenum and floor of the mouth at the same . level as marginal gingiva, 2 inoperable tori or exostosis at the same level as the marginal gingiva . 3 severly undercut lingual alveolus, 4 considerable gingival recession . CONTRAINDICATIONS, 1 anterior teeth severely tilted to the lingual . 2 diastema and open cervical embrasures where the metal will show . Advantages , 1 can be used where lingual bar and lingual plate can not .
2 does not transverse the marginal gingiva or overly the lingual alveolus . 3 easy to add prosthetic teeth to framework , Disadvantages . cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, Must be bulky to have sufficient rigidity and thus may be objectionable . to the patient , , 5 labial bar, Indications , 1 When the mandibular teeth are so severely inclined lingually as to prevent . the use of lingual major connector , 2 When large lingual tori exist and their removal is contraindicated .
Design , 1 It is a half pear shaped bar runs across the mucosa labial to the anterior . teeth , 2 Labial vestibule should be adequate to allow the superior border to be . placed at least 3 mm below the free gingival margins . 3 Relief is required beneath the bar , Advantages . 1 it solved the problem of lingually inclined teeth avoid surgical . intervention to remove large lingual tori, Disadvantages . 1 lack of rigidity, 2 least comfortable to patient .
cden tu edu iq, Tikrit University College of Dentistry Dr Reem Ahmed Shehab. Lec 6 prosthodontics 3rd class, , cden tu edu iq. major connectors are used for special applications in which lingual bars and lingual plates are contraindicated 1 lingual bar Is the most frequently used mandibular major connector because of its simplicity in design and construction Indication It is the first choice major connector should be used whenever the

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