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Comparison of fracture resistance and failure pattern of endodontically treated premolars with different esthetic onlay systems: An in vitro study.

Mynampati P, Babu MR, Saraswathi DD, Kumar JR, Gudugunta L, Gaddam D - J Conserv Dent (2015 Mar-Apr)

Bottom Line: All onlays were cemented using Multilink Automix.Coming to modes of failure, only Group IV had showed no cracks in any of the restorations.Full Zirconia MOD onlays increased the fracture resistance of endodontically treated premolars to a significantly higher level than the sound teeth.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry and Endodontics, Drs Sudha and Nageswara Rao Siddhartha Institute of Dental Sciences, Chinoutapalli, Andhra Pradesh, India.

ABSTRACT

Aim: To compare the fracture resistance and modes of failures of three different aesthetic MOD onlays on endodontically treated premolars.

Materials and methods: Forty sound maxillary premolars were selected of which 10 untreated teeth were taken as control (Group I). The other thirty premolars were subjected to standardized MOD onlay preparations and root canal treatments and divided into 3 equal groups. Onlays were prepared in Group II- Indirect composite, Group III- Lithium Disilicate ceramic and Group IV- Full Zirconia. All onlays were cemented using Multilink Automix. All the 40 samples were subjected to fracture resistance testing on Universal testing machine. Also fractured specimens were observed under stereo-microscope for modes of failure.

Results: Group IV presented the highest fracture resistance. Groups II and III presented no significant difference in fracture resistance from each other (P > 0.05). Group II and Group III showed significantly lower fracture resistance values than Group I. Coming to modes of failure, only Group IV had showed no cracks in any of the restorations.

Conclusion: Full Zirconia MOD onlays increased the fracture resistance of endodontically treated premolars to a significantly higher level than the sound teeth.

No MeSH data available.


Related in: MedlinePlus

Bar graph representing mean fracture resistance of four groups
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Figure 1: Bar graph representing mean fracture resistance of four groups

Mentions: The mean fracture resistance and standard deviation of the experimental groups is shown in Figure 1. Group IV presented the highest fracture resistance. Groups II and III showed significantly lower values than the Group I. However, Groups II and III presented no significant difference from each other. Failure patterns are shown in Figure 2 and Table 1. Group II showed 30% type II fractures and 70% type V fractures. Group III demonstrated 30% type II fractures, 10% type IV, and 60% type V. Group IV demonstrated 90% type I and 10% type II fractures.


Comparison of fracture resistance and failure pattern of endodontically treated premolars with different esthetic onlay systems: An in vitro study.

Mynampati P, Babu MR, Saraswathi DD, Kumar JR, Gudugunta L, Gaddam D - J Conserv Dent (2015 Mar-Apr)

Bar graph representing mean fracture resistance of four groups
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4379655&req=5

Figure 1: Bar graph representing mean fracture resistance of four groups
Mentions: The mean fracture resistance and standard deviation of the experimental groups is shown in Figure 1. Group IV presented the highest fracture resistance. Groups II and III showed significantly lower values than the Group I. However, Groups II and III presented no significant difference from each other. Failure patterns are shown in Figure 2 and Table 1. Group II showed 30% type II fractures and 70% type V fractures. Group III demonstrated 30% type II fractures, 10% type IV, and 60% type V. Group IV demonstrated 90% type I and 10% type II fractures.

Bottom Line: All onlays were cemented using Multilink Automix.Coming to modes of failure, only Group IV had showed no cracks in any of the restorations.Full Zirconia MOD onlays increased the fracture resistance of endodontically treated premolars to a significantly higher level than the sound teeth.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry and Endodontics, Drs Sudha and Nageswara Rao Siddhartha Institute of Dental Sciences, Chinoutapalli, Andhra Pradesh, India.

ABSTRACT

Aim: To compare the fracture resistance and modes of failures of three different aesthetic MOD onlays on endodontically treated premolars.

Materials and methods: Forty sound maxillary premolars were selected of which 10 untreated teeth were taken as control (Group I). The other thirty premolars were subjected to standardized MOD onlay preparations and root canal treatments and divided into 3 equal groups. Onlays were prepared in Group II- Indirect composite, Group III- Lithium Disilicate ceramic and Group IV- Full Zirconia. All onlays were cemented using Multilink Automix. All the 40 samples were subjected to fracture resistance testing on Universal testing machine. Also fractured specimens were observed under stereo-microscope for modes of failure.

Results: Group IV presented the highest fracture resistance. Groups II and III presented no significant difference in fracture resistance from each other (P > 0.05). Group II and Group III showed significantly lower fracture resistance values than Group I. Coming to modes of failure, only Group IV had showed no cracks in any of the restorations.

Conclusion: Full Zirconia MOD onlays increased the fracture resistance of endodontically treated premolars to a significantly higher level than the sound teeth.

No MeSH data available.


Related in: MedlinePlus