Preventive prosthodontics: Maxillary denture fracture

Farmer, John B.

doi:10.1016/0022-3913(83)90006-9

Cited by 30 publications

(18 citation statements)

References 9 publications

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“…Fatigue failures do not require strong biting forces-low cyclic forces like those that occur during mastication can affect the fatigue of the material (9). Typical fatigue failure of upper complete dentures may be a midline fracture.…”

Section: Discussionmentioning

confidence: 98%

“…While the denture base is deformed under the loading of the cyclic deformation during mastication flexural fatigue failure can occur. Farmer (9) has listed the clinical factors related to the failure of single dentures: 1) improperly contoured mandibular occlusal plane; 2) high frenulum attachment; 3) occlusal scheme; 4) occlusal forces; 5 ) denture foundation; and 6) thickness of the denture base. To provide harmonious occlusion with a denture, the natural teeth that will oppose a denture often require some degree of recontouring (10).…”

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confidence: 99%

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Evaluation of damage to removable dentures in two cities in Finland

Vallittu¹,

Lassila²,

Lappalainen³

1993

Acta Odontologica Scandinavica

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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.

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Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 99%

Evaluation of damage to removable dentures in two cities in Finland

Vallittu¹,

Lassila²,

Lappalainen³

1993

Acta Odontologica Scandinavica

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Thean

Chew

Goh

et al. 1998

Australian Dental Journal

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Ab stractChemical cure resin materia.ls are generally used in the repair of dentures. Different repair resins used may yield different results. The bond strength of three autopolymerizing resins were evaluated using a torsional test method. The results showed that Palapress and Caulk resins had a higher repair strength than Rapid Repair resin .Key words: Denture repair resins, bond strength, torsion tests evaluation.(Received for publication March 1995. Revised June 1995. Accepted July 1995 Int roductionAlthough resins for denture repairs are not as extensively studied as adhesives to dentine, porcelain or enamel, the importance of denture repairs cannot be underestimated. Huggett et al. 1 cited that nearly three-quarters of a million dentures were repaired each year in England and Wales at a cost of £4 .7 million (at 1987 price) to the National Health Service (UK) and an estimated similar amount is spent by patients privately. Most of these repairs are due to failure of polymethylmethacrylate (PMMA) denture bases.Smith 2 noted that denture failure depends on the shape, conditions of loading, inherent residual stresses and mechanical properties of the denture base. 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. Success depends on correcting the offending clinical cause and a strong repair junction. Confidence in the repair rests on the repair resin. There is, therefore, a need to fully characterize the bond strength of the denture repair resins available in the market.The purpose of the present study was to use the torsional test proposed by Stewart et al. 5 to assess the relative merits of denture repair resins. It seeks to compare the shear bond strength of three commercially available acrylic resin denture repair materials in vitro.A torsional test was chosen as the stress exerted on the specimen has a significant shear component and is, therefore, closer to the clinical situation. The torsion specimen also has a uniform state of stress at any point on the specimen surface and this state of stress is less dependent on parallelism and specimen geometry than for diametral or three-point bending tests.

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“…However, raising the denture base thickness (to about 2.5 mm) showed marked deficiency in speech clarity and comfort. On the other hand, Farmer [10] stated that denture bases less than 2 mm in thickness were more prone to fracture.…”

Section: Discussionmentioning

confidence: 98%

A Functional Stress Analysis in the Maxillary Complete Denture Influenced by the Position of Artificial Teeth and Load Levels: an In-vitro Study

Naik

Krishna

Shetty

et al. 2010

J Indian Prosthodont Soc

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The fracture of complete dentures fabricated using Polymethyl methacrylate resin constitutes a challenge to the clinician and remains an unresolved problem. To determine whether gradual increase in load or different posterior teeth positions in maxillary denture would influence the pattern of stress. Two groups of maxillary dentures were fabricated with different posterior teeth positions (Group I with teeth on the crest of the ridge; Group II with buccal to the crest of the ridge.) using casts prepared from prefabricated edentulous molds, with 5 dentures in each group. Two strain gauges were cemented on to the midline of each denture, one on the anterior palatal area and other on the posterior palatal area. The dentures were loaded from 0 to 110 N in steps of 10 N, and the strains induced were measured. Differences of the stress magnitudes between the 2 groups were statistically analyzed using Mann-Whitney U test. The anterior palatal area of the maxillary denture was dominated by a tensile stress, which was greater in the group II than in group I. The posterior palatal area was dominated by compressive stress but the outer placement of the maxillary teeth caused a significant decrease in the compressive stress. The high anterior tensile stress with compressive stress in the posterior palatal area during loading may be responsible for denture base fractures that initiate from the anterior palatal area. The buccal placement of posterior teeth may play a role in the fatigue fracture of the maxillary denture.

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Preventive prosthodontics: Maxillary denture fracture

Cited by 30 publications

References 9 publications

Evaluation of damage to removable dentures in two cities in Finland

Evaluation of damage to removable dentures in two cities in Finland

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

A Functional Stress Analysis in the Maxillary Complete Denture Influenced by the Position of Artificial Teeth and Load Levels: an In-vitro Study

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