Minimal-preparation minor retainer(s) are also used for minimal-preparation where the occlusion is favourable. Place a post into the hole and should be seated snugly in the shaft to ensure there is no movement towards the ridge. Its disadvantages include entrapment of food particles, which may lead to tongue habits that may annoy the patient. Pontic or the artificial crown derives its name from a latin word âPonsâ which means bridge. 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. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. 1.Should provide uniform veneer of porcelain of approximately 1.2mm. Fixed-fixed , cantilever and spring cantilever bridges have only major retainer(s). A smooth rounded ridge is best for the placement of a pontic. Such cases can be treated by two methods: One is to modify the pontic and fill the entire embrasure space with pink porcelain. Tissue contact should pertain to the crest of the ridge. The lingual surface is designed with hygiene as the primary concern. Socket-preservation techniques should be performed at the time of extraction to create the tissue recess from which the ovate pontic form will emerge. The only disadvantage of this designs its poor aesthetics, which results due to wide embrasures. 2.Metal surface must be smooth and free of pits â else may lead to incomplete bonding of porcelain. Occupies missing space acts as space maintainer. This pontic has a convex tissue surface, which contacts the tissue at one single point without any pressure. The components of a bridge are retainers, pontics and connectors. 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. Major or minor. The occlusal surface is customized over the backing. The interpontic embrasure in filled in anterior segment using pink porcelain which also solves the esthetic problem and in cases of moderate ridge resorption and loss of papillae between pontic and abutment. Kindly find the references stated at the end of each blog. When the vertical height is insufficient, the residual ridge is lowered and reshaped to allow space for physiologic pontic. It consists of a vertical slot in its flat lingual surface. 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. He justified that, the esthetics will not be compromised as in 90% of the cases, the mandibular cervical region is not visible. The indications for the use of nonrigid connector in fixed prosthodontics are. The pins in the porcelain tooth are ground off and the tooth is altered and customized according to the ridge. This pontic is more aesthetic as it appears to arise from the ridge like a natural tooth. [The retainer is an important appliance that unites the abutment teeth with the suspended portion of the bridge. It should be positioned over the backing such that the gold porcelain junction does not contact the tissues. o Connector: connects the pontic to the retainer. The pontic has a convex gingival surface that favors pinpoint tissue contact. a) all pontics materials tested produced some change when they were in contact with the gingival tissue. Podshadley and stein (1968) contradicting didnât find any relevance between soft tissues and pontic fabricated from gold alloys ,resins gazed ceramics . If veneer is to be applied cut back the wax pattern approximately. Made entirely of metal if esthetics is not important. They differ from Harmony facings (discussed later) in that the entire gingival portion of the facing is custom-made. A Pontic is the artificial tooth on an FPD that replaces the missing natural tooth and restores its function. They resemble sanitary facings but they have positive pinpoint tissue contact. ( Log Out / Abrams L et al 1980, Hurzeler MB, Weng D 1999- Gave gingival grafting (Plastic surgery) to enhance tissue conditioning thus satisfying the highest esthetic standards for a pontic suitable in patients with high smile line-Hygiene procedures easy to perform as convexity of the base. Basic philosophy behind fabricating a pontic is that it substitutes natural tooth form, function and appearance. Disadvantages: Meticulous oral hygiene is necessary to prevent tissue inflammation resulting from the large area of tissue contact. Fabrication of a small anterior pontic gives an ugly appearance. Castings are done in usual manner the pontics are either cast connected or soldered. Cary P. et al in 1997 derived a simplified techniques for stabilization of the pontics. In these types of bridges, the abutment teeth require preparation and reduction to support the prosthesis. 2.Buccal and lingual surface follow a normal tooth form from cusp tip to height of contour and tapers from here to gingival surface. In addition, its recessed form is not susceptible to food impaction. Glossary of Prosthodontic Terms ( GPTâ No. These pontics have slots on the proximal surface to fit into the metal projections made in the fixed partial denture. This design is recommended for the replacement of mandibular posterior teeth where esthetics is a lesser concern. Prepare a working cast in the usual manner. rigidly fixed to the retainer provides adequate strength and . The occlusal forces are transmitted to the supporting structures through the pontic, connectors, and retainers in FPD prosthesis. They are indicated for cases with reduced inter-arch space, the pontic should give the appearance of an exaggerated occlusoÂgingival dimension. The sizes of the maxillary interproximal embrasures should be reduced for the sake of aesthetics. and should not contain any junctions between different materials. Conical pontic- placed in extraction site. Advantages include its pleasing appearance and its strength. Portion of a fixed bridge that unites retainer and pontic. 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. 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. Large angle embrassure spaces around tissue contact collect debris. Gingival surface is shaped like arch may mesiodistally. hello, its a good knowledge there. 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. The result after 6 months of observation showed that. Pontic designs are classified into two general groups: Mucosal contact & Non-mucosal contact based on the shape of the gingival side of the pontic. The gingival surface of the pontic is convex both buccolingually and mesiodistally. – If complete metal retainers are used â all metal pontic. They are used if the pontics and retainers have to be made separately . Notes from lectures during the course of Dental Technology. Pontic may be connected to a retainer through a rigid connector such as a cast joint or soldered joint or a non-rigid connector such as key and keyway or as in telescopic retainer. pontic, connectors, and retainers. It must look as tooth-like as possible. 2. But studies have shown that the finish of the surface is more important than the material used in maintaining tissue health.Â. In the conventional bridge, the pontic is joined to the retainer solely by means of a solder joint which forms the connector. 6. In cases with overhanging hyperplastic tissues, surgical excision of these issues should be carried out. Restores function and stabilizes adjacent with opposing teeth. These facings are used when the tissue contact of the pontic should of glazed porcelain. Joseph et al (1990) studied the relationship between surface roughness of the pontics and dental plaque accumulation. It has a horizontal tubular slot running in the centre of the lingual surface of the facing. (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. If the pontic is not designed to restore function and aesthetics, the chances of failure are dramatically increased. 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. The contour of the ridge and texture of the soft tissues should be observed during intra-oral examination. 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. Pontic may be connected to a retainer … The hygienic pontic is the least “toothlike” design and is therefore reserved for teeth seldom displayed during function (i.e., the mandibular molars). The authors concluded that, whatever material used maybe and are smoothened as much as possible, they must be cleaned regularly. Changes in the residual ridge, opposing occlusion and proximal space affect the success of the restoration. Though when pontic was first designed or used is unknown, history of pontic dates way back to 1918 when Tinker proposed hygienic pontic. 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. Q83. $63.52 $ 63. Alignment of abutment teeth and retention. Often called egg-shaped, bullet-shaped, or heart-shaped. Get it as soon as Sat, Dec 5. Excess may lead to inadequate support and fracture. The space created due to the loss of a tooth is usually sufficient for the fabrication of a good pontic. But sufficient space should be given to avoid impingement to the interdental papilla.Â. The occlusal forces applied to a fixed partial denture (FPD) are transmitted to the supporting structures through the pontic, connectors, and retainers. The only disadvantage of this design is its poor aesthetics, which results due to wide embrasures. Otherwise it will not serve the same occlusal functions. A paralleling drill press is used for drilling the hole, as there holes should be parallel to one another and again parallel to path of insertion and removal. 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. (“black triangles”) on a fixed partial denture, When opposing natural dentition and complete or partial denture resin veneered teeth are used. Access to them and the patient’s dexterity should be taken into account in designing pontics. The modified ridge lap design is the most common pontic form used in areas of the mouth that are visible during function. Class II : Loss of ridge height, with normal width. In the case of a long-span bridge, A technique derived by Ruhlam et al 1967 may be advanced. 4.0 out of 5 stars 25. 5. Wax the abutment retainers and pontic to full contour as usual and incorporate the exposed part of the post into the pontic. With time laps after extraction, the space available for the pontic may be compromised because of tooth migration adjacent to the edentulous space. Create a free website or blog at WordPress.com. It is attached to the backing occlusally with the help of retentive pins. Connectors, the portion of a fixed dental prosthesis that unites the retainer(s) and pontic are concentrated on them . Â Â Wider embrasures are provided for posterior teeth for better cleansing. – Not used in long span and high-stress areas. The facing consists of a flat lingual surface with two retentive pins. 7). This slot and the proximal bevels provide retention. The design of the sanitary pontic allows easy cleaning, because its tissue surface remains clear of the residual ridge. Cemento-enamel junction of abutment tooth/ teeth used as vertical reference points. Care should be taken to avoid contact with the metal porcelain junction with the tissues. 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. All the functions should be executed in a manner compatible with oral health and comfort. For cases with deficient pontic space, the following procedures can be done: Adams et al in his study showed that 32.4% showed Class I defect, 2.9% Class II, 55.9% being Class III and 8.8% having no defect or Class N. Treatment planning is done by the study cast and radiograph-To analyze alveolar ridge, abutment teeth, gingiva, size of edentulous space. It is used in the form of key (tenon) attached to pontic and keyway (mortise) placed within the retainer. Roughness of pontic material and dental plaque â JPD 1990 (23) 407-411. The material used and the degree of tissue contact affect the success of the restoration. Ovate pontic was designed by Deeway and Lugsmith in 1933. Only a portion of the gingival bulk is contoured in a harmony facing. The facing has a flat occlusal surface which is customized as needed. To these facings, the gingival area is again built with porcelain and glazed for tissue tolerance. Usually, this is accomplished with rigid connectors.Connector is the maximum stress bearer component of fixed partial denture. A nonrigid connector, a stress breaking mechanical union of retainer and pontic, is usually recommended in such situation. – Maxillary posterior region âif esthetics a prime consideration modified ridge lap is used with porcelain facing. Conventional bridges are named depending on the way the pontic (false teeth) is attached to the retainer. Gingival colored prosthesis is a solution for correcting large alveolar defects associated with esthetics and phonetic problems, The success of a fixed partial denture depends on the proper design of the pontic. Pontips- dentist desiring glazed porcelain in contact with residual ridge. A modified version of the sanitary pontic has been developed . 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). Clinical results showed that plaque formation was noticed in all the pontic materials used.
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