Tags

Type your tag names separated by a space and hit enter

Fracture strength of minimally prepared resin bonded CEREC inlays.
Oper Dent. 2009 Sep-Oct; 34(5):537-43.OD

Abstract

PURPOSE

This study compared the structural integrity and fracture mode of teeth restored with traditionally and minimally prepared resin-bonded CAD/CAM inlays fabricated from the same material.

METHODS

Forty intact maxillary premolars were used and divided into four groups. Two groups were prepared according to a traditional inlay preparation design (2.0 mm occlusal reduction, a 1.5 mm wide proximal box and divergent walls) and two groups were prepared according to a newly proposed minimal preparation design (round shaped cavity with 1.0 mm occlusal reduction, a U-shaped proximal box 1.0 mm wide and parallel walls). Two restorative systems were tested: a composite system comprised of Paradigm MZ100 (3M ESPE) blocks and RelyX Unicem (3M ESPE) resin cement and a ceramic system comprised of ProCAD blocks (Ivoclar-Vivadent) and Variolink II (Ivoclar-Vivadent) resin cement. The inlays were cemented according to the manufacturers' instructions. Each specimen was loaded axially to its occlusal surface at a crosshead speed of 0.5 mm/minute in a universal testing machine until fracture. The fracture load data were analyzed using ANOVA, comparing inlays of the same restorative material. Also, the mode of fracture of the inlays was recorded and analyzed using a non-parametric test (Kruskal-Wallis).

RESULTS

In the composite system case, the mean fracture load and SD were 1322 N (+/- 445) for the traditional inlays and 1511 N (+/- 395) for the minimal inlays, while in the ceramic system case, those values were 1135N (+/- 450) for the traditional inlays and 1761 N (+/- 494) for the minimal inlays. Statistical analysis of the results showed that there was no statistically significant difference between the two designs for the composite system, while for the ceramic system, the minimally prepared teeth showed higher mean fracture strength. Non-parametric analysis (Kruskal-Wallis) of the mode of fracture showed that there was no statistically significant difference between traditionally and minimally prepared inlays for both systems (p > .05).

CONCLUSIONS

Under the conditions of this experimental study, only the ceramic inlays, when prepared with a minimal preparation design, demonstrated a higher fracture strength as compared to the traditionally prepared teeth. Use of the proposed minimal preparation design did not compromise the immediate post-operative structural integrity of teeth restored either with resin composite or ceramic inlays.

Authors+Show Affiliations

Adult Dental Care, School of Clinical Dentistry, University of Sheffield, Sheffield, United Kingdom. e.tsitrou@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19830967

Citation

Tsitrou, Effrosyni, et al. "Fracture Strength of Minimally Prepared Resin Bonded CEREC Inlays." Operative Dentistry, vol. 34, no. 5, 2009, pp. 537-43.
Tsitrou E, Helvatjoglou-Antoniades M, Pahinis K, et al. Fracture strength of minimally prepared resin bonded CEREC inlays. Oper Dent. 2009;34(5):537-43.
Tsitrou, E., Helvatjoglou-Antoniades, M., Pahinis, K., & van Noort, R. (2009). Fracture strength of minimally prepared resin bonded CEREC inlays. Operative Dentistry, 34(5), 537-43. https://doi.org/10.2341/08-030-L
Tsitrou E, et al. Fracture Strength of Minimally Prepared Resin Bonded CEREC Inlays. Oper Dent. 2009 Sep-Oct;34(5):537-43. PubMed PMID: 19830967.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture strength of minimally prepared resin bonded CEREC inlays. AU - Tsitrou,Effrosyni, AU - Helvatjoglou-Antoniades,Maria, AU - Pahinis,Kimon, AU - van Noort,Richard, PY - 2009/10/17/entrez PY - 2009/10/17/pubmed PY - 2009/12/16/medline SP - 537 EP - 43 JF - Operative dentistry JO - Oper Dent VL - 34 IS - 5 N2 - PURPOSE: This study compared the structural integrity and fracture mode of teeth restored with traditionally and minimally prepared resin-bonded CAD/CAM inlays fabricated from the same material. METHODS: Forty intact maxillary premolars were used and divided into four groups. Two groups were prepared according to a traditional inlay preparation design (2.0 mm occlusal reduction, a 1.5 mm wide proximal box and divergent walls) and two groups were prepared according to a newly proposed minimal preparation design (round shaped cavity with 1.0 mm occlusal reduction, a U-shaped proximal box 1.0 mm wide and parallel walls). Two restorative systems were tested: a composite system comprised of Paradigm MZ100 (3M ESPE) blocks and RelyX Unicem (3M ESPE) resin cement and a ceramic system comprised of ProCAD blocks (Ivoclar-Vivadent) and Variolink II (Ivoclar-Vivadent) resin cement. The inlays were cemented according to the manufacturers' instructions. Each specimen was loaded axially to its occlusal surface at a crosshead speed of 0.5 mm/minute in a universal testing machine until fracture. The fracture load data were analyzed using ANOVA, comparing inlays of the same restorative material. Also, the mode of fracture of the inlays was recorded and analyzed using a non-parametric test (Kruskal-Wallis). RESULTS: In the composite system case, the mean fracture load and SD were 1322 N (+/- 445) for the traditional inlays and 1511 N (+/- 395) for the minimal inlays, while in the ceramic system case, those values were 1135N (+/- 450) for the traditional inlays and 1761 N (+/- 494) for the minimal inlays. Statistical analysis of the results showed that there was no statistically significant difference between the two designs for the composite system, while for the ceramic system, the minimally prepared teeth showed higher mean fracture strength. Non-parametric analysis (Kruskal-Wallis) of the mode of fracture showed that there was no statistically significant difference between traditionally and minimally prepared inlays for both systems (p > .05). CONCLUSIONS: Under the conditions of this experimental study, only the ceramic inlays, when prepared with a minimal preparation design, demonstrated a higher fracture strength as compared to the traditionally prepared teeth. Use of the proposed minimal preparation design did not compromise the immediate post-operative structural integrity of teeth restored either with resin composite or ceramic inlays. SN - 0361-7734 UR - https://www.unboundmedicine.com/medline/citation/19830967/Fracture_strength_of_minimally_prepared_resin_bonded_CEREC_inlays_ L2 - https://meridian.allenpress.com/operative-dentistry/article-lookup/doi/10.2341/08-030-L DB - PRIME DP - Unbound Medicine ER -