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논문 기본 정보

자료유형
학술저널
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저널정보
대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제1권 제2호
발행연도
2009.1
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85 - 90 (6page)

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STATEMENT OF PROBLEM. Over the years, resin-bonded fixed partial dentures (RBFPDs) have gone through substantial development and refinement. Several studies examined the biomechanics of tooth preparation and framework design in relation to the success rate of RBFPDs and considered retention and resistance form essential for increase of clinical retention. However, these criteria required preparations to be more invasive, which violates not only the original intentions of the RBFPD, but may also have an adverse effect on retention due to loss of enamel, an important factor in bonding. PURPOSE. The object of this in vitro study was to compare the dislodgement resistance of the new types of RBFPDs, the conventional three-unit fixed partial denture, and conventional design of RBFPD (Maryland bridge). MATERIAL AND METHODS. Fifty resin mandibular left second premolars and second molars were prepared on dentiforms, according to the RBFPD design. After model fabrication (five group, n = 10), prostheses were fabricated and cemented with zinc phosphate cement. After cementation, the specimens were subjected to tensile loading at a cross head speed of 4 mm/min in a universal testing machine. The separation load was recorded and analyzed statistically using one-way analysis of variance followed by Duncan’s multiple range test. RESULTS. Group V, the pin-retained RBFPDs, had the highest mean dislodgement resistance, whereas specimens of group II, the conventional RBFPDs, exhibited a significantly lower mean dislodgement resistance compared to the other 4 groups (P < .05). There were no significant differences between group I, III, and IV in terms of dislodgement resistance (P > .05). Group V had the highest mean MPa (N/mm2) (P < .05). There was no significant difference between groups I, II, III and IV (P > .05). CONCLUSION. Within the limits of the design of this in vitro study, it was concluded that: 1. The modified RBFPDs which utilizes the original tooth undercuts and requires no tooth preparation, compared with the conventional design of RBFPDs, has significantly high dislodgement resistance (P < .05). 2. The modified RBFPDs which utilizes the original tooth undercuts and requires minimal tooth preparation, compared with the conventional FPDs, has significantly no difference in retention and dislodgement resistance)( P > .05). 3. The pin-retained FPDs showed a high dislodgement resistance compared to the conventional three-unit FPDs (P < .05).
#modified resin-bonded fixed partial dentures #dislodgement resistance #undercut

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참고문헌 (20)

참고문헌 신청
Arcoria CJ / 1990 / Effect of undercut placement on crown retention after thermocycling / J Oral Rehabil 17 : 395 ~ 402 google schola Barrack G / 1995 / A lood back at the adhesive resin-bonded cast restoration / J Esthet Dent 7 : 263 ~ 273 google schola Botelho M / 1999 / Resin-bonded prostheses: the current state of development / Quintessence Int 30 : 525 ~ 534 google schola Chow TW / 2002 / Tooth preparations designed for posterior resin-bonded fixed partial dentures: a clinical report / J Prosthet Dent 88 : 561 ~ 564 google schola Hansson O / 1996 / A longitudinal study of resin-bonded prostheses / J Prosthet Dent 76 : 132 ~ 139 google schola

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