Retention force and fatigue strength of overdenture attachment systems

Botega, Daniela Maffei; Mesquita, Marcelo Ferraz; Henriques, Gep; Vaz, Luı́s Geraldo

doi:10.1111/j.1365-2842.2004.01308.x

Cited by 98 publications

(132 citation statements)

References 7 publications

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“…6 Moreover, the oral environment, composition of saliva and temperature may also interfere with the final findings. 1 Regarding these limitations, this laboratory study showed valid outcomes compared to those observed in the literature employing clinical conditions such as the utilization of solution of artificial saliva at 37°C. It is important to note that this investigation analyzed only one retention modality that is the retentive strength obtained by mechanical components.…”

Section: Discussionmentioning

confidence: 63%

“…6 Retention of 5N is reported to be adequate for stabilization of RPO and RPD during function. 1,11 This observation…”

Section: Discussionmentioning

confidence: 66%

“…These results are in accordance with studies that reported good retentive performance of the ERA system in clinical service and experimental trials. 1,5,6 The main difference between the mechanical properties of these metal alloys chosen for this investigation is concerning the modulus of elasticity. Cp Ti or Ti alloys present lower modulus of elasticity and therefore, greater flexibility when compared with Co-Cr and, Ni-Cr alloys.…”

Section: Discussionmentioning

confidence: 99%

“…Total of 5400 cycles were performed corresponding to 5 years in service. 1,12,23,24 The retentive strength values were captured at cycle one and after 540, 1080, 2160, 3240, 4320 and 5400 removalplacement testing cycles (corresponding to 1/2, 1, 2, 3, 4, and 5 years respectively in service) using data acquisition software (Lab View 8.0, National Instruments, Austin, USA). The statistical analyses were performed using Two-Way Anova and Tukey's test for group comparisons (SPSS 12.0 software SPSS Inc, Chicago, IL, USA).…”

Section: 5mentioning

confidence: 99%

“…25 The retention of an RPO is achieved through clasps, adhesive attachments, crowns, and fixed partial dentures (FPD) with intra or extracoronal attachments, telescopes, root caps, and/ or prefabricated intraradicular retainers. 16,25 Considering the use of intraradicular retainers as the treatment option, the placement of resilient attachment for distal extension for RPO indicated minimal component wear, no radiographic evidence of excessive bone loss, and stable peri-implant soft tissue 1,5,6,25 and increase patient satisfaction. 13 Gold type IV and cobalt-chromium (Co-Cr) are among the most frequently used alloys to cast removable partial denture (RPD) and RPO frameworks.…”

Section: Introductionmentioning

confidence: 99%

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Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

Souza¹,

Silva²,

Coelho³

et al. 2011

The Journal of Contemporary Dental Practice

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Aim: There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and considering different period of time (0, 1/2, 1, 2, 3, 4 and 5 years). Methods:Using two metallic matrices, representing a partially edentulous mandibular right hemiarch with the first molar crown, canine root and without premolars, 60 frameworks were fabricated. Three groups (n = 20) of each metal were cast and each group was divided into two subgroups (n = 10), corresponding the molar undercut of 0.25 mm and 0.75 mm. The nylon male was positioned at the matrix and attached to the acrylic resin of the prosthetic base. The samples were subjected to an insertion and removal test under artificial saliva environment. Results:The data were analyzed and compared with ANOVAs and Tukey's test at 95% of probability. The groups cast in cobaltchromium and nickel-chromium-titanium had the highest mean retention strength (5.58 N and 6.36 N respectively) without significant difference between them, but statistically different from the group cast in commercially pure titanium, which had the lowest mean retention strength in all the periods (3.46 N). The association frameworks using nickel-chromium-titanium and cobalt-chromium could be used with 0.25 mm and 0.75 mm of undercut, but the titanium samples seems to decrease the retention strength, mainly in the 0.75 mm undercut. The circumferential clasps cast in commercially pure titanium used in 0.75 mm undercuts have a potential risk of fractures, especially after the 2nd year of use. Conclusion:This in vitro study showed that the framework association between cast clasp and an extra resilient attachment are suitable to the three metals evaluated, but strongly suggest extra care with commercially pure titanium in undercut of 0.75 mm.Clinical significance: Frameworks fabricated in Cp Ti tend to decrease in retentive strength over time and have a potential risk of fracture in less than 0.75 mm of undercut.

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Section: Discussionmentioning

confidence: 63%

“…6 Retention of 5N is reported to be adequate for stabilization of RPO and RPD during function. 1,11 This observation…”

Section: Discussionmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: 5mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

Souza¹,

Silva²,

Coelho³

et al. 2011

The Journal of Contemporary Dental Practice

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Retention force measurement of telescopic crowns

et al. 2009

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This study deals with the determination of the retentive force between primary and secondary telescopic crowns under clinical conditions. Forty-three combined fixed-removable prostheses with a total of 140 double crowns were used for retention force measurement of the telescopic crowns prior to cementation. The crowns had a preparation of 1-2°. A specifically designed measuring device was used. The retentive forces were measured with and without lubrication by a saliva substitute. The measured values were analyzed according to the type of tooth (incisors, canines, premolars, and molars). Additionally, a comparison between lubricated and unlubricated telescopic crowns was done. As maximum retention force value 29.98 N was recorded with a telescopic crown on a molar, while the minimum of 0.08 N was found with a specimen on a canine. The median value of retention force of all telescopic crowns reached 1.93 N with an interquartile distance of 4.35 N. No statistically significant difference between lubricated and unlubricated specimens was found. The results indicate that retention force values of telescopic crowns, measured in clinical practice, are often much lower than those cited in the literature. The measurements also show a wide range. Whether this proves to be a problem for the patient's quality of life or not can however only be established by a comparison of the presented results with a follow-up study involving measurement of intraoral retention and determination by e.g. oral health impact profile.

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Clinical retention force development of double crowns

Bayer

Stark²,

Gölz

et al. 2011

Clin Oral Invest

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This study deals with the development of the retentive forces of double crowns intraorally measured. Twenty-five combined fixed-removable prostheses with a total of 84 double crowns were included in the study. The intraoral measurement was performed at 72 defined measuring points directly adjacent to the double crowns of the dentures. The measurement was performed 4-6 weeks (baseline), 6 months (recall 1), and 18 months (recall 2) after the insertion of the restoration. A specifically designed measuring device was used. The median values for the single measuring points reached 4.705 N at the baseline, 5.190 N after 6 months, and 3.740 N after 18 months. The measured values were analyzed according to differences between the median retention forces at the three defined points in time. The statistical analysis of the median values showed no statistical difference for the retention force change after 6 months but for the decrease until the second recall (Mann-Whitney test). The retention force per denture was calculated by a summation of the single measuring points. At the baseline, 12.9 N was reached. The forces did only decrease slightly and were not statistically significant. The results indicate that retention force values of double crowns, measured intraorally at the patient, do not relevantly change clinically within the first 1.5 years. Within the limitations of this study, it can be stated that wear does not influence the retentive forces of double crowns within the first 18 months. After this period the retention force should be still sufficient for denture retention.

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Retention force and fatigue strength of overdenture attachment systems

Cited by 98 publications

References 7 publications

Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

Retention force measurement of telescopic crowns

Clinical retention force development of double crowns

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