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Dimensional Accuracy of Castings Fabricated with Ring-less and Metal Ring Investment Systems for Implant Supported Fixed Dental Prosthesis: An In-vitro Comparative Study

Identifieur interne : 004234 ( Main/Curation ); précédent : 004233; suivant : 004235

Dimensional Accuracy of Castings Fabricated with Ring-less and Metal Ring Investment Systems for Implant Supported Fixed Dental Prosthesis: An In-vitro Comparative Study

Auteurs : Rakesh Shah ; Jp Singh ; Manjit Kumar ; Dsj D'Souza

Source :

Medical Journal, Armed Forces India [ 0377-1237 ] ; 2011.

RBID : PMC:4920612

Abstract

Background

The ring-less investment system is in use for dental casting, although there was no adequate scientific data to support its use either for conventional fixed dental prosthesis or implant retained fixed dental prosthesis.

Methods

An in-vitro study was undertaken to compare the vertical marginal accuracy of single full coverage metal restorations, between ring-less and metal ring investment techniques, using two different investment materials, for implant supported fixed dental prosthesis. Three groups were made of ten samples each. Group I consisted of metal ring with PCT® FlexVest (phosphate bonded investment material). Group II consisted of metal ring with Bellasun® investment material. Group III and the final group consisted of ring-less investment system and Bellasun® investment material. The wax patterns were prepared on a metal die, cast and finished. The cast restorations (samples) were again seated on the metal die and the accuracy of fit was evaluated by measuring the gap between the finish line on the die and the margins of the sample at four specific sites using a profile projector (Helios-350H, Microtecnica, LTF, Italy) having accuracy of 1µm.

Result

Mean marginal accuracy for Group-III was found to be the least (58.87 +17.87 µm) followed by Group-II (97.23 + 16.37 µm), and Group-I (109 + 7.55 µm). However, Group I showed the least variability among the readings (SD=7.55).

Conclusion

Ring-less system of casting can be recommended for use in fabricating implant supported fixed dental restorations.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4920612

DOI: 10.1016/S0377-1237(11)80012-2
PubMed: 27365761
PubMed Central: 4920612

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Rakesh Shah

<affiliation><nlm:aff id="aff1">Graded Specialist (Prosthodontics), 1 CDU, C/o 56 APO</nlm:aff>
<wicri:noCountry code="subfield">C/o 56 APO</wicri:noCountry>
</affiliation>

Jp Singh

<affiliation><nlm:aff id="aff2">Commandant, CMDC, Command Dental Advisor (SC), Pune-40</nlm:aff>
<wicri:noCountry code="subfield">Pune-40</wicri:noCountry>
</affiliation>

Manjit Kumar

<affiliation><nlm:aff id="aff3">Ex Reader, Department of Dental Surgery, AFMC, Pune-40</nlm:aff>
<wicri:noCountry code="subfield">Pune-40</wicri:noCountry>
</affiliation>

Dsj D'Souza

<affiliation><nlm:aff id="aff4">Commanding Officer, 200 MDC, C/o 56 APO</nlm:aff>
<wicri:noCountry code="subfield">C/o 56 APO</wicri:noCountry>
</affiliation>

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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>The ring-less investment system is in use for dental casting, although there was no adequate scientific data to support its use either for conventional fixed dental prosthesis or implant retained fixed dental prosthesis.</p>
</sec>
<sec><title>Methods</title>
<p>An in-vitro study was undertaken to compare the vertical marginal accuracy of single full coverage metal restorations, between ring-less and metal ring investment techniques, using two different investment materials, for implant supported fixed dental prosthesis. Three groups were made of ten samples each. Group I consisted of metal ring with PCT® FlexVest (phosphate bonded investment material). Group II consisted of metal ring with Bellasun® investment material. Group III and the final group consisted of ring-less investment system and Bellasun® investment material. The wax patterns were prepared on a metal die, cast and finished. The cast restorations (samples) were again seated on the metal die and the accuracy of fit was evaluated by measuring the gap between the finish line on the die and the margins of the sample at four specific sites using a profile projector (Helios-350H, Microtecnica, LTF, Italy) having accuracy of 1µm.</p>
</sec>
<sec><title>Result</title>
<p>Mean marginal accuracy for Group-III was found to be the least (58.87 +17.87 µm) followed by Group-II (97.23 + 16.37 µm), and Group-I (109 + 7.55 µm). However, Group I showed the least variability among the readings (SD=7.55).</p>
</sec>
<sec><title>Conclusion</title>
<p>Ring-less system of casting can be recommended for use in fabricating implant supported fixed dental restorations.</p>
</sec>
</div>
</front>
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Dimensional Accuracy of Castings Fabricated with Ring-less and Metal Ring Investment Systems for Implant Supported Fixed Dental Prosthesis: An In-vitro Comparative Study

Dimensional Accuracy of Castings Fabricated with Ring-less and Metal Ring Investment Systems for Implant Supported Fixed Dental Prosthesis: An In-vitro Comparative Study

Source :

Abstract

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