The buccal and lingual surfaces of a pontic will be designed as a result of deciding the ridge surface. Retainer: The part of a fixed dental prosthesis that unites the abutment(s) to the remainder of the restoration. Made entirely of metal if esthetics is not important. Criteria for choosing a suitable retainer includes: The principles guiding the design of the pontic are : All surfaces of the pontic especially the ridge surface, should be made as cleansable as possible. It is attached to the backing occlusally with the help of retentive pins. Reichenbach E 1931, Dewey K W 1933 also stated that after extended periods of service the adjacent soft tissue tends to become inflamed, and the alveolar bone is resorbed. Cut the other end of the post so it does not interfere with the occlusion, otherwise leave it as long as possible. It is indicated for the replacement of mandibular posterior teeth where aesthetics is not a major concern. Modified ridge lap pontics where tissue contact is strictly limited to the labial surface of the ridge. Metal design to a interconnecting bar structure. It is important too that the embrasure spaces and connectors should be smooth and cleansable. Design of multiple pontics – JPD 1981 (46) 634-636. An attempt to replace with a smaller pontic will compromise esthetics and hygiene. This facing consists of a metal core over which porcelain is fused to closely resemble the contours of a natural tooth. 2. Replacement of missing permanent teeth in which the Retainer/Abutment teeth have a favorable long term ... Connector Bar Connector Bars may be indicated to brace individual Retainer/Abutment teeth with considerable coronal ... D6243 Pontic – porcelain fused to titanium and titanium alloys D6245 Pontic – porcelain/ceramic Roughness of pontic material and dental plaque – JPD 1990 (23) 407-411. – Food entrapment leads to tongue habits. Pontic facing was made of porcelain denture teeth multiple drill holes of 2mm deep were made using frill press on the lingual surface of the facing. KNOW SELECTION CRITERIA FOR PONTIC AND DESIGNS!  Tissue surface of the pontic shows a ‘T’ shaped contact. Fixed-movable bridges have a major retainer at one end of the pontic and a minor retainer … Ovate pontic was designed by Deeway and Lugsmith in 1933. All pontics should be designed to withstand occlusal forces. The lingual surface of this facing is flat and consists of two pins for retention. It is indicated for the replacement of mandibular posterior teeth where aesthetics is not a major concern. Longevity of fixed partial denture and abutment rely on The major disadvantage of this system is its complex design, which leads to accumulation of plaque and gingival inflammation. The hygienic pontic is the least “toothlike” design and is therefore reserved for teeth seldom displayed during function (i.e., the mandibular molars). In such cases, a proper pontic cannot be placed and the design of the pontic should be compromised. Pontic materials used were glazed porcelain, acrylic resin and cast gold. – Blocks self-cleansing mechanism of tongue and cheeks. With time-lapse after extraction, there is a migration of adjacent and opposing teeth – they should be orthodontically repositioned and modified with complete coverage. If the edentulous ridge is heavily resorbed, then the large gingival embrasures between the pontic(s) and retainer(s) will appear highly unaesthetic. Tripodakis A P 1990 : Contour of alveolar ridge requires a convex basal seat in the design of pontic to prevent the impairment of esthetics , function , phonetics. This pontic contacts the tissue only at the ridge crest. This means that they must be smooth and highly polished or glazed. Pontips- dentist desiring glazed porcelain in contact with residual ridge. A FPD with the pontic rigidly fixed to the retainer provides adequate strength and stability to the prosthesis and also minimizes the stresses associated with the restoration. The pontic on an implant supported bridge is reported using the conventional pontic code representing the material used (e.g., D6245 for a porcelain/ceramic pontic). The lingual surface should be designed such that it is similar to adjacent teeth from the cusp tip till the height of contour, then it should recede sharply and concavely from the height of contour towards the facial surface to form a pinpoint contact on the labial surface of the residual alveolar ridge. Saddle or ridge lap designs should be avoided because the concave gingival surface of the pontic is not accessible to cleaning with dental floss, which will lead to plaque accumulation. The occlusal surface of the pontic should resemble the occlusal surface of the tooth it replaces. This pontic is very easy to clean and maintain. 3. It is indicated in cases with reduced occluso-gingival height. The conical pontic is easy for the patient to keep clean. – When partial veneer retainers are used, prefabricated facings are indicated using same metal as retainers. Excellent class I defect is corrected by subepithelial or submucosal graft. its emergence from the ridge appears identical to that of a natural tooth. Fig. The facial surface should be designed with aesthetics as the primary concern. – When PFM retainers are used PFM pontics are selected. The contour of the ridge and texture of the soft tissues should be observed during intra-oral examination. Porcelain is supported by metal placed at right angle to the occlusal force. But studies have shown that the finish of the surface is more important than the material used in maintaining tissue health.Â. Contact with the facial /buccal surface of the ridge is essential to provide a natural appearance. Occlusal plane correction is done before the fabrication of the fixed prosthesis as in the case of supra eruption of opposing teeth. Clinical results showed that plaque formation was noticed in all the pontic materials used. Fixed-fixed , cantilever and spring cantilever bridges have only major retainer(s). Traumatic extraction results in severe bone resorption, surgical ridge augmentation, and soft tissue correction enhance esthetics. Incisal (A) and labial (B) views of a four-unit fixed dental prosthesis with a loop connector. Pontic or the artificial crown derives its name from a latin word “Pons” which means bridge. Belorend introduced multiple fused pontics in 1981. The primary purpose of the dental bridge is to receive the forces of occlusion and to transmit them through the abutments so that occlusion is … 4.Occlusal contacts must be placed so as to avoid metal porcelain fracture during centric and eccentric movements and contacts. The connector is that part of a fixed partial denture or splint that joins the individual components (retainers or pontics) together. ... Conntek RL-70046-GB Upto 15-Feet Heavy Duty 12/3 Coiled Spring Extension Cord 15/20-Amp female Connector. Cases with severe residual alveolar ridge resorption should be treated with ridge augmentation, tissue grafts, etc. Connectors may be fixed or movable. Socket-preservation techniques should be performed at the time of extraction to create the tissue recess from which the ovate pontic form will emerge. To these facings, the gingival area is again built with porcelain and glazed for tissue tolerance. They should also be as easy to clean as possible. The dimensions of the zirconia frameworks were: 0.5 mm thickness of retainer and 6 mm2 cross section of connector (2 mm wide, 3 mm high) (Figs 3a and 3b), with shape and size of pontic according to the emergence profile of the respective site. Large angle embrassure spaces around tissue contact collect debris. 3. An inverted orientation of the nonrigid connector … complete denture an appliance replacing all the teeth of one jaw, as well as associated structures of the jaw. Gingival response to pontic: JPD 1968 (19). Porcelain is added to the gingival surface and contoured according to the ridge, finally glazed and finished. It has a horizontal tubular slot running in the centre of the lingual surface of the facing. According to Eissmann (1971) The boundaries of edentulous space are residual ridge opposing occlusal surface, proximal surface of abutment teeth and musculature of tongue and cheek or lips. Facing and backing available with the gingival backed tip. 6. (GPT8) Pontic: An artificial tooth on a fixed dental prosthesis that replaces a missing natural tooth, restores its function,and usually fills the space previously occupied by the clinical crown. Complete the retainers and contour the proximal and tissue surfaces of the pontic for the desired tissue contact. Nylon bristles are aligned to the drill holes and incorporated into the wax pattern of the backing (here the backing is fabricated according to the facing). 20-44). Arlon G. (1968) studied the effect of various pontic materials on gingiva. The modified ridge lap design overlaps the residual ridge on the facial (to achieve the appearance of a tooth emerging from the gingiva) but remains clear of the ridge on the lingual. Attach sprue, invest, cast and finish as normal, the post is removed during finishing stage, after the pontic is attached to the retainers. ( Log Out /  4. They are used only in conjunction with all-porcelain bridges. The components of a bridge are retainers, pontics and connectors. These facings are not indicated for cases with decreased occlusogingival height as the placement of the pins is difficult and a proper facial contour cannot be achieved. Amount of Occlusal load that is anticipated for that patient. Pontic serves to restore the mastication, speech to maintain tooth relationships, both interarch and intra arch, and also to satisfy patients esthetic and psychological needs by eliminating the space in dentition. Both intracoronal and extracoronal restorations can be … – Recontouring and ridge augmentation in case of large ridge defects. Occlusal plane correction is done before the fabrication of fixed prosthesis. Other disadvantages include the need for surgical tissue management and the associated cost. There are three types of fixed connector: They are made by wax patterns of the retainers and pontics connected by wax being produced so that the bridge is cast in a single piece. After tooth loss, residual ridge is formed from the gingiva and alveolar mucosa-Pontic positioned away from movable mucosa. Metal-ceramic pontics are stiffer and withstand occlusal forces better if they are made fairly thick and if the porcelain is carried right round them from the occlusal to the ridge surface leaving only a line of metal visible on the lingual surface or none at all. Minimal-preparation minor retainer(s) are also used for minimal-preparation where the occlusion is favourable. In 1987 Abrams H et al in a retrospective study of partially edentulous patient showed that 91% of edentulous anterior section – Alveolar defects . Conversely, nonrigid connector functions as a stress breaker between retainer and pontic and have thus been recommended to diminish the forces instead of usual rigid connector. 3.Sharp angles should be avoided to prevent stress concentrations. Study by Reichenbach E 1931 stated that it was used to prevent the extraction site from collapsing after removal of a tooth and to imitate the natural emergence profile of the tooth. The loop may be cast from sprue wax that is circular in cross section or shaped from platinum-gold-palladium (Pt-Au-Pd) alloy wire. This means that the groove or depression in the minor retainer (the female part of the attachment) always have a good base against which the male part of the attachment can seat. Gingival surface is shaped like arch may mesiodistally. Disadvantages: Meticulous oral hygiene is necessary to prevent tissue inflammation resulting from the large area of tissue contact. Lingual surface has slightly deflective contour. If the pontic is not designed to restore function and aesthetics, the chances of failure are dramatically increased. The amount of Occlusal load determines the selection of material as well as the design of the FPD. Change ), You are commenting using your Google account. It should be made as convex as possible, with only one point of contact at the center of the residual ridge. Cast connectors are stronger than soldered connectors. Rigid connector is cast, soldered or fused union between retainer and pontic where as non-rigid connector permits limited movements between otherwise independent members of the fixed partial denture prosthesis. The buccal and lingual shunting mechanism should correspond to the adjacent teeth. Its disadvantages include entrapment of food particles, which may lead to tongue habits that may annoy the patient. The longer the span, the greater the occlusal-gingival thickness of the pontic should be . The major factors that determine the design of a pontic are: Space available for the placement of the pontic. The pins in the porcelain tooth are ground off and the tooth is altered and customized according to the ridge. This pontic consists of a large gingival bulk, which can be adapted to the ridge. The design of the sanitary pontic allows easy cleaning, because its tissue surface remains clear of the residual ridge. Wax the abutment retainers and pontic to full contour as usual and incorporate the exposed part of the post into the pontic. What are types of minor connectors? and should not contain any junctions between different materials. – Mechanical failure due to improper framework. The facing is retained by a backing with a lug (elevation), which is designed to engage the retention slot The tissue contact should be a part of the backing (not the backing facing junction) to ensure a smooth finish. FPDs in which only one side of Pontic is attached to a retainer … Donald A. stated that, the fused multiple pontics design, which was thought to be best for mandibular posterior segment can be used in other parts of mouth also. Tissue contact should resemble a letter T whose vertical arm ends at the crest of the ridge. Cannot be used in decreased occlusogingival height. The only disadvantage of this designs its poor aesthetics, which results due to wide embrasures. He also suggested this design for posterior segment. b) All pontic material listed were equally well tolerated by tissue after 6 month interval. Alignment of abutment teeth and retention. Where the full length of the pontic is visible. They are used if the pontics and retainers have to be made separately . Span: The length of the alveolar ridge between the natural teeth where the bridge will be placed. Pontic may be attached to one or more retainers or cast separately and soldered. Abutment: The tooth or implant that supports and retains a dental prosthesis. When vertical height is insufficient, residual ridge is contoured is reshaped. 2.Metal surface must be smooth and free of pits – else may lead to incomplete bonding of porcelain. Pin’s come out of backing, which was cast after building wax in those holes which were attached to the cast ponticDisadvantage: – Pin holes were stress points that lead to fracture. Care should be taken to avoid contact with the metal porcelain junction with the tissues. Connector: Joins the pontic to the retainer or two retainers together. – Maxillary posterior region –if esthetics a prime consideration modified ridge lap is used with porcelain facing. It is indicated in cases with limited inter-arch distance. Tissue surface is convex and dictated by the shape of the extraction bucket. The overall length of the buccal surface should be equal to that of the adjacent abutments or pontics. (“black triangles”) on a fixed partial denture, When opposing natural dentition and complete or partial denture resin veneered teeth are used. Then wax the pontic to proper axial and occlusal (or incisal) contour (Fig. – If complete metal retainers are used – all metal pontic. In cases with overhanging hyperplastic tissues, surgical excision of these issues should be carried out. Pin pontic modification of long pin pontic, is intend to grind the tissue surface for appropriate contact and then polished or glazed. Though when pontic was first designed or used is unknown, history of pontic dates way back to 1918 when Tinker proposed hygienic pontic. Occlusogingival Height and mesiodistal width of edentulous space: PFM ridge in long span with reduced occlusogingival height can result in porcelain fracture. Cemento-enamel junction of abutment tooth/ teeth used as vertical reference points. The result after 6 months of observation showed that. Major or minor. In these types of bridges, the abutment teeth require preparation and reduction to support the prosthesis. Perel in 1972 presented modified sanitary pontic. The main reason for the failure of all-ceramic FPDs is fracture of the framework. Occlusogingival thickness of pontics should be no less than 3mm and adequate space below it for cleansing. a) all pontics materials tested produced some change when they were in contact with the gingival tissue. Such cases can be treated by two methods: One is to modify the pontic and fill the entire embrasure space with pink porcelain. Drill a hole just lingual to the crest of the edentulous ridge where the pontic will be placed.   Tissue contact is very important for a pontic. Possess all or nearly all convex surface. Tissue contact should be made by the backing and not the facing backing junction. In the conventional bridge, the pontic is joined to the retainer solely by means of a solder joint which forms the connector. Conventional bridges are named depending on the way the pontic (false teeth) is attached to the retainer. For two things to be joined together there should be a medium for it. only to manage excessive (single/multiple) pontic space(s), but also to splint pathologically migrated teeth effectively.3 Loop connector is a non-rigid connector and consists of a loop on the lingual aspect of the prosthesis that connects adjacent retainers and/or pontic.9 The loop may denture. Usually, this is accomplished with rigid connectors.Connector is the maximum stress bearer component of fixed partial denture. Change ), You are commenting using your Twitter account. Create appropriate proximal contact areas between the pontic and retainer. The functional relationship of the cusps of the pontic and the opposing teeth is the most critical consideration in the design of the pontic. Only a portion of the gingival bulk is contoured in a harmony facing. 5. Get it as soon as Sat, Dec 5. Facings are supplied with standardized metal backings with male plug which fits into female groove on lingual aspect of facing. Glossary of Prosthodontic Terms ( GPT– No. Here, the flat lingual surface of the pin facing is modified by adding additional porcelain onto the gingival portion of its lingual surface. Long term provisional restorations must be used for a period of 6 to 12 months. The modified ridge lap design is the most common pontic form used in areas of the mouth that are visible during function. [1] An FPD with the pontic . Joseph et al (1990) studied the relationship between surface roughness of the pontics and dental plaque accumulation. The pontics should be reduced as healing progresses. Otherwise it will not serve the same occlusal functions. The pontic replaces the missing tooth. But sufficient space should be given to avoid impingement to the interdental papilla.Â. [ den´cher] a complement of teeth, either natural or artificial; ordinarily used to designate an artificial replacement for the natural teeth and adjacent tissues. Lingual contour should be in harmony with that of the adjacent teeth. Gingival Coloured Ceramics, masks, prosthesis If augmentative measures are contraindicative or undesirable, small alveolar deficiencies and missing papillae can be reconstructed by restorative measures- all gingival ceramic masks. Ovate pontic-appears to emerge from gingiva like a natural tooth. SELECTION CRITERIA FOR PONTIC AND PONTIC DESIGNS. Charles B. Porter, described fixed partial denture with multiple pontics by restricting the pontic embrasure for lower anterior segment. The contour of the residual alveolar ridge. Class I : Loss of faciolingual ridge width,with normal apricocoronal height. Thanks! Study 53 3 Pontics and Connectors flashcards from Kelly G. on StudyBlue. When an occlusal load is applied to the retainer on the abutment tooth at 1 end of a fixed partial denture with a pier abutment, the pier abutment may act as a fulcrum. A Pontic is the artificial tooth on an FPD that replaces the missing natural tooth and restores its function. A smooth rounded ridge is best for the placement of a pontic. A larger contact with the ridge is provided for a natural look. Stein R S 1966 , Cavazoz E 1968 : the convex basal surface , which rests on small area on alveolar ridge , fulfills the recommendations made in dental literature with regard to hygiene procedures and prevention of irritation of underlying soft tissues. The hole should not interfere with the pontic tissue contact area. Therefore mentioned measures taken for soft tissue conditioning are repeated at intervals of 2 weeks until satisfactory contour and pseudo/papillae are formed. A major retainer for a conventional posterior bridge should not be less than an MOD inlay with full occlusal protection. Tissue contact should pertain to the crest of the ridge. It should be remembered that the entire gingival bulk is custom fabricated in a modified pin facing whereas in a harmony facing a portion of the gingival bulk is custom fabricated. Tinker 1918 named it “Sanitary Dummy” pontic. Tissue contact is passive and extend no further lingually than the midline. Added bulk for the strength of connectors is increased. Substitutes natural tooth form, function and appearance. These pontics have slots on the proximal surface to fit into the metal projections made in the fixed partial denture. Can wear Dentures overnight invites Denture Stomatitis? A resin-retained bridge (also known as resin-bonded-bridge or resin-bonded fixed dental prosthesis (RBFDP)) is a bridge (a fixed dental prosthesis) replacing a missing tooth that relies for its retention on a composite resin cement.It is one of many available dental restoration methods which is considered minimally invasive and conservative of tooth tissue. – Mandibular posterior region – spheroidal pontic – Patient require an accommodation period for all ceramic FPDs. Castings are done in usual manner the pontics are either cast connected or soldered. In fixed Prosthodontics, connector refers to the portion of a fixed partial denture that unites the retainer and pontic. Anterior pontic design – JPD 1984 (51): 774-76. [The retainer is an important appliance that unites the abutment teeth with the suspended portion of the bridge. This pontic is more aesthetic as it appears to arise from the ridge like a natural tooth. It consists of a vertical slot in its flat lingual surface. But in many cases, due to a long period of edentulousness, the adjacent teeth tend to be tilted or drifted towards this space. However, space limitations may require overreduction of the preparation or overcontouring of the retainer to place the keyway within the retainer wall. Conventional bridges are bridges that are supported by full coverage crowns, three-quarter crowns, post-retained crowns, onlays and inlays on the abutment teeth. 1. With time laps after extraction, the space available for the pontic may be compromised because of tooth migration adjacent to the edentulous space. However, the bridge retainer codes vary depending on whether or not an abutment was used to attach the bridge retainer to the implant body. If mesiodistal width is reduced, metal pontic with porcelain or acrylic facing is advised. Study 59 Pontics and Connectors flashcards from Ashley Z. on StudyBlue. The pontic should not be designed to pressurize the alveolar mucosa, as it may ulcerate. It should be as convex as possible from mesial to distal (the greater the convexity, the easier the oral hygiene). Stein RS 1966- Stated that pressure free contact over a small area produce highly esthetic results in contrast to classic requirements for pontics as this design produces an emergence profile looking similar to that of the natural tooth. Causes tissue inflammation and hence not used. The lingual surface is designed with hygiene as the primary concern. It is more aesthetic; hence, it is indicated for anterior teeth. Hygiene maintenance (flossing) is more important than the pontic design itself. It cannot be used when there is reduced interocclusal distance due to the presence of a large gingival bulk. Rigid connector cast connector soldered connector 2. semi-rigid connector -interlocks custom made 3. Access to them and the patient’s dexterity should be taken into account in designing pontics. In 1983 Seivert gave a suitable classification for alveolar ridge defects. Section one wax connector with a thin ribbon saw (sewing thread is a suitable alternative) and remove the isolated retainer from the master cast. The saddle pontic has a concave fitting surface that overlaps the residual ridge buccolingually. When an adequate. This slot and the proximal bevels provide retention. Occupies missing space acts as space maintainer. Main advantage is increased strength, fever laboratory steps used in high stress, mandibular posterior region and even in bruxist. 1. In a metal-ceramic pontic the junction between the two materials should be well away from the ridge surface of the pontic. 2.Buccal and lingual surface follow a normal tooth form from cusp tip to height of contour and tapers from here to gingival surface.
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