Retention in complete denture
Outline
• Introduction
• Definition of complete denture
• Definition of retention
• The factors that affect the retention of the complete denture
• Explanation of each factor
Definition of complete denture:
Complete denture is a removable dental prosthesis that replaces the entire dentition and associated structures of the maxilla and mandible
Definition of retention:
• It is the ability of the complete denture to resist displacement in a direction opposite that of insertion. Bouchere 12ed
• It is the resistance of denture to vertical movement away from tissue. prosthetic dentistry glossary
• It is the resistance of movement of denture from its basal seat especially in vertical direction.
…show more content…
So, the increase in size of the denture bearing area will lead to the increase in the retention. the maxillary denture has more retention than the mandibular denture because the maxillary denture bearing area is 24 sq.cm but the mandibular denture bearing area is 14 sq.cm which is less than that of the maxillary denture
physiological factors: saliva: all the physical factors depend on the presence of the saliva between the denture and the mucosa. Therefore, according to Stephan law saliva should be viscous in order to have a good retention, according to Camphell, the fluid film thickness should be small to increase the retention and for Wilhem H.W showed that is very important to the denture retention to have less salivary glands
Physical factors :
Adhesion:
It is the physical attraction of unlike molecule to one another. The ionic force between charged salivary glycoprotein and surface epithelium or acrylic resin will lead to the adhesion .and the closeness of adaptation to oral mucosa will increase the denture adhesion. With less contact angle there is more adhesion. Also adhesion depend on the viscosity of saliva because the wetting of the saliva on the denture base is less than on oral mucosa.
…show more content…
mechanical factors:
Undercuts:
if we design a denture whch utilize the presence of the bony undercuts the retention may increase , but we should care on the planing of the the path of insertion in order to benefit from this undercuts without traumatizing the underlying tissue during insertion and removale of the denture . there are two types of path of insertion to improve the retention . first , it is the single path of inserttion which use the labial undercuts , the second , it is the dual path of insertion which use the unilateral undercuts
muscular factors :
Oral and facial musculater : if the denture work in harmony with the muscle this will increase th retention . so , the buccul and ligual falanges should be shaped in a way that the musculater fits automaticlly , the polished surface should be well contured and the tooth should be in a neutral zone between the lips and the cheek
Tooth surfaces are referred to by various names in dentistry, including mesial, distal, buccal, and lingual. If you drew a midline t...
S, L. (2002, March 12). Arch Wired. Retrieved February 19, 2014, from A brief history of braces: http://www.archedwire.com/HistoryofOrtho.htm
This is done using the branch of dentistry called prosthodontics which establishes the goals of dentistry by replacing the missing teeth and oral and maxillofacial tissues with artificial substitutes. Prosthodontics is either removable prosthodontics or fixed prosthodontics. Fixed prosthodontics is the branch
The biggest shortcoming of these archaic appliances was the fact that they were subject to decay in the wearer’s mouth. Thus, installed false teeth would have to be replaced on a regular basis, resulting in a very costly procedure. However, this problem was rectified in 1774 by Duchateau and Dubois de Chemant with their invention of the first full set of dentures that would not rot. This was due to their porcelain composition – a material that was much more conducive to the everyday wear and tear of one’s teeth. Although an incredible improvement, even the porcelain version had its difficulties. Unable to produce anything less than a full set of teeth (the surrounding porcelain was required to keep each tooth in place), patients who were missing only one or two teeth were out of luck, unless they were willing to have the rest of their teeth removed as well. And yet, in 1808, Giuseppangelo Fonzi developed the first individual appliance – a single porcelain tooth that could be held in place by a pin drilled into the jawbone. Finally, in 1845, Claudius Ash, known as the official “inventor of dentures”, produced the porcelain version that is now used today. His contributions included a suction method of adhesion for a full set of dentures, so that no form of attachment could be seen by an onlooker.
A partial denture is a removable appliance constructed by a dentist to replace missing teeth. Partial dentures are used in an area of the mouth where fixed, non-removable appliances are neither practical nor feasible. Constructing partial dentures takes approximately one to four visits depending on the type of appliance chosen. The dentist recommends the partial denture options best suited to his patient's aesthetic, functional and financial needs.
Adhesion of resin materials to tooth structure has been a challenge in the history of adhesive dentistry. Currently, bond durability is one of the main research topics in adhesive dentistry. Regardless of the improvements in bonding technology, resin dentin bonds show limited durability for both etch and rinse and self-etch adhesive systems.
and its inferior border is prolonged downward, so as to overlap the upper and forepart of the vertebra below.
Dental caries occurs through a complex interaction over time between acidogenic micro organisms and fermentable carbohydrate, and host factors including teeth and saliva.1 The caries process can be described as a imbalance between re and demineralization and when more minerals are lost than gained from the hard tissues over time, caries lesion occurs.2Dental caries, if allowed to progress will result in non cavitated caries lesions initially on tooth surfaces, and eventually can progress to cavitation. There has been a general trend in clinical practice that caries lesion management focus primarily on operative treatment rather than using preventive non invasive strategies. This will lead to several replacements over time with increasing restoration size and produces iatrogenic damage. It has been reported that 71% of all restorations are performed on previously restored teeth, with secondary carious lesions as a major cause.3 This shows that although the carious lesion was repaired, the dental caries was not adequately treated, since the actual cause and risk factors were not adequately resolved. Recently the concept for caries management has been changed and focused mainly on multifaceted nature of caries and biofilm involvement. Currently it has been shown that the success to caries prevention
...for each individual tooth which gave them the look and feel of brand new teeth. These teeth were fitted to the people’s mouth and mounted down with steel springs ("Technology Timeline.").
The stress caused by the lack of passive fit for implant- supported prostheses does not drive away by time due to the ankylotic state of osseo-integrated dental implants, endorsing the need for passive fit5. The absence of passive fit between prosthesis and implant will rise the occurrence of mechanical complications, like occlusal over-loading,
Dentures are removable teeth. They’re used for replacing missing teeth and their surrounding tissue. Due to their important role in your mouth, understanding broken denture repairs is also important.
Picture yourself with a toothache or someone with poor hygiene and knowing you cannot do anything to change it without a dentist. A dentist is specialized individual that treats the diseases and conditions that affect the oral cavity.
If the aim is achieved, residents will be provided with optimal denture care including correct cleaning and storage handling, this will improve the quality of oral health for denture
The existence of micro-leakage in dental restorations was first identified in scientific research in 19126. In a study done by Harper (1912), air pressure was used to penetrate the surface between an amalgam restoration and cavity preparation7. By applying pressure through a hole in the pulpal floor, Harper could quantify the amount of pressure needed to establish leakage through the emergence of bubbles from the margins of the restoration. Research has come a long way since Harper first recognized micro-leakage. Adaptations of new materials used when placing composite restorations like BondAband, a light-cured glass-ionomer cement has been shown to reduce marginal micro-leakage in posterior restorations8. A decrease in microleakage has also been shown with the use of an ...