Evaluation of damage to removable dentures in two cities in Finland

Abstract

The number of damaged dentures and type of damage to removable dentures repaired in dental laboratories was investigated using a questionnaire sent to 24 dental laboratories in Finland. Eight variables were examined for each damaged denture. The results showed that the type of dentures most commonly needing repair was the complete upper denture (49%). The most frequent type of damage was breakdown of the acrylic base and loosening of an artificial tooth. The chi-square test established a statistical dependence (p < 0.005) between damaged dentures and their age. Damaged upper partial dentures most frequently had natural teeth or fixed prostheses as antagonist teeth. Damaged lower skeletal dentures and acrylic partial dentures had a complete denture as the antagonist (p < 0.05). Removable dentures made of acrylic resin material seemed to break despite strengtheners, such as clasp wire.

An evaluation of bond strengths of denture repair resins by a torsional method

“…Vallittu et al 4 noted that the highest incidence of denture fractures occurred between 16-36 months after being in service.…”

“…Farmer 3 listed various clinical factors such as improperly contoured mandibular occlusal plane, high frenal attachment, incorrect occlusal schemes, heavy occlusal forces, poor adaptation of the denture base to the residual alveolar ridge and denture base thickness as primary causes of denture fractures. Vallittu et al 4 noted that the highest incidence of denture fractures occurred between 16-36 months after being in service.The clinician must often decide whether to repair or replace the broken denture . To minimize inconvenience to the patient and save costs in the reconstruction of the dentures, quick and reliable denture repairs are often necessary.…”

Fracture resistance of maxillary complete dentures subjected to long‐term water immersion

“…One study 3 reported that midline fractures generally begin either at the labial notch or in the anterior part of the denture palate. Another study 2 also reported that a midline fracture of a maxillary complete denture ran through the notch between the two central teeth, extending partially or completely through the denture base.…”

“…The most frequently damaged denture is the maxillary complete denture. Fracture of the acrylic base was found in many damaged maxillary complete dentures; typically, the fatigue failure of maxillary complete dentures is a midline fracture 2 . One study 3 reported that midline fractures generally begin either at the labial notch or in the anterior part of the denture palate.…”

Effect of Fish Scale Powder Addition to Flexural Strength of Heat Cured Acrylic Resin

“…Earlier studies reported that the fracture rate of acrylic resin was 64% [8] and 68% [9]. Dentures fracture may occur inside or outside the mouth due to expelling the denture from the mouth while coughing, or simply dropping it [10].…”