Problems with dentures - bad types of dental prosthesis

Temporary dental crown or acrylic resin pivot

This type of crown made from acrylic resin, is used until a real (definitive), porcelain or PFM (porcelain fused to metal) crown can be fitted. This period should not exceed 15 days, which is more than required in order to fit a permanent crown. No matter how well it was done, the temporary crown has no quality. Do not be tempted by the price and do not be fooled. It was not made to last, it does not have the perfection, hardness, colour stability or biocompatibility of a true fixed dental crown.

Nesbit denture, nesbit rpd, nesbit partial

Unilateral removable prosthesis with 1 or more teeth and clasps at both ends

Also known as bridge with retentive clasps, or nesbit rpd, this is a type of prosthesis that is extremely dangerous to use. Because of its small size, it can easily be swallowed or become lodged in the trachea. It seems very tempting to have a prosthetic tooth in acrylic prosthesis, which is limited to only one side of the mouth, specially when there are no missing teeth on the other side.
In effect, it seems what it is, as everything else about it is wrong. The removable denture should be always bilateral, it should extend to the other side of the arch in order to give it dimension, stability and retention. If you want to see images on this, please search for the term "nesbit partial or denture", which is the term by which they are known.

Removable prosthesis without support

removable partial dentureacrylic resin lower denture
removable partial denture and complete lower denture

All removable dentures (partial or complete) in acrylic and silicone are prostheses that sit on the gum, without any support from existing teeth, in the case of a removable partial denture, on either side of the toothless area. This fact accelerates bone loss and consequent degradation of oral health conditions. It decreases the longevity of the teeth that remain, complicating or compromising the future possibility of prosthetic quality restorations.
Use of this type of denture is only temporarily justified, whilst the person waits for the undertaking of a good quality job.
Unfortunately, peoples economic status has led them to use this type of provisional prosthesis for much longer periods than they were designed for.
The negative aspects are even greater in flexible dentures. The feature that makes them alluring, is the elasticity, which is the same contributor towards damage to the alveolar bone, and occurs much more than with a rigid, acrylic prosthesis.
[Read about RPD - removable partial denture in metal and acrylic, the only acceptable type.]

Acrylic complete denture with hollow palate - bad denture

The above known removable denture can fit in many ways, among which by vacuum formed between the palate and the denture. Sometimes it creates a zone in the middle of the palate without being in contact with the same, with a heart-shape or another, intended to raise such vacuum. It is wrong, unnecessary and dangerous because it enhances the deformation of the palate and the appearance of tumours. The correct procedure is to seal the end of the prosthesis in the area of the Fovea Palatini. A slight groove is sufficient to obtain a perfect seal.

As seen on TV denture perfect smile

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