Research and EducationEffects of different cusp coverage restorations on the fracture resistance of endodontically treated maxillary premolars
Section snippets
Material and Methods
This study protocol was approved by the Ethical Research Committee (2014.144) of the Karadeniz Technical University. Caries-free human maxillary premolars with two roots and two canals (extracted for orthodontic reasons) were used. Teeth with cracks, fractures, or defects and internal-external resorption were excluded from the study. The mesiodistal and buccolingual tooth sizes were measured with digital calipers, and teeth with similar dimensions were selected. The selected teeth were assigned
Results
The data exhibited normal distributions according to the Shapiro-Wilk tests. Regarding the control and reduction groups, the 1-way ANOVA revealed significant differences (P<.001) among all groups. A Tamhane test revealed differences between the reduction groups and the control group (Table 1). All of the reduction groups exhibited higher fracture resistances than the MOD group. Significantly higher fracture resistance values were observed in 2 reduction groups (2.5-mm anatomic and 3.5-mm
Discussion
In the present study, the fracture resistances of ETMPs restored with various cusp coverage restorations were evaluated. Many factors may influence in vitro results; thus, in vitro experiments should represent the intraoral environment. Simulations of periodontal ligaments can influence not only the fracture load values but also the fracture patterns.35 For these reasons, the roots of the teeth were covered with latex liners.
Changes in the mechanical properties of a restoration under
Conclusions
Adhesive cusp coverage restorations increased the fracture resistances of ETMPs with MOD cavities to a level comparable with that of intact teeth. The cusp reduction designs and thicknesses influenced the fracture resistances and fracture patterns. Increases in cusp reduction thickness increased the mean fracture resistance values. The teeth restored with anatomic cusp reduction designs and reduction thicknesses of least 2.5 mm exhibited greater fracture resistances and greater proportions of
Acknowledgments
The authors thank Dr Tamer Tuzuner for support while preparing this study.
References (38)
- et al.
Is fracture resistance of endodontically treated mandibular molars restored with indirect onlay composite restorations influenced by fibre post insertion?
J Dent
(2012) - et al.
Effect of remaining tooth structure on the fracture resistance of endodontically-treated maxillary premolars: an in vitro study
J Prosthet Dent
(2016) - et al.
Impact of the quality of coronal restoration versus the quality of root canal fillings on success of root canal treatment: a systematic review and meta-analysis
J Endod
(2011) - et al.
The endo-restorative interface: current concepts
Dent Clin North
(2010) - et al.
Influence of restorative technique on the biomechanical behavior of endodontically treated maxillary premolars. Part I: fracture resistance and fracture mode
J Prosthet Dent
(2008) - et al.
Long-term survival of endodontically treated molars without crown coverage: a retrospective cohort study
J Prosthet Dent
(2005) - et al.
Effect of ferrule location on the fracture resistance of crowned mandibular premolars: an in vitro study
J Prosthet Dent
(2015) - et al.
Strength estimation of different designs of ceramic inlays and onlays in molars based on the Tsai-Wu failure criterion
J Prosthet Dent
(2007) - et al.
Thickness of CAD-CAM composite resin overlays influences fatigue resistance of endodontically treated premolars
Dent Mater
(2009) - et al.
Multi-factorial analysis of a cusp-replacing adhesive premolar restoration: a finite element study
J Dent
(2008)
Failure of endodontically treated teeth: classification and evaluation
J Endod
Evaluation of the relative contributions of multi-factors in an adhesive MOD restoration using FEA and the Taguchi method
Dent Mater
Influence of remaining coronal tooth structure location on the fracture resistance of restored endodontically treated anterior teeth
J Prosthet Dent
Influence of occlusal contact and cusp inclination on the biomechanical character of a maxillary premolar: a finite element analysis
J Prosthet Dent
Fracture resistance and stress distribution in endodontically treated maxillary premolars restored with composite resin
J Prosthodont
Cuspal flexure of teeth with composite restorations subjected to occlusal loading
J Adhes Dent
Influence of cavity type and size of composite restorations on cuspal flexure
Med Oral Patol Oral Cir Bucal
Three-year clinical comparison of survival of endodontically treated teeth restored with either full cast coverage or with direct composite restoration. 2002
Int Endod J
Fracture resistance and gap formation of MOD restorations: influence of restorative technique, bevel preparation and water storage
Oper Dent
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Fracture resistance of endodontically-treated maxillary premolars restored with different type of posts and direct composite reconstructions: A systematic review and meta-analysis of in vitro studies
2021, Dental MaterialsCitation Excerpt :Such elements often require cusp coverage [17] or indirect reconstruction techniques (overlays, crowns), and direct restoration are indicated only in presence of well represented vestibular and palatal walls and at least one marginal ridge [18]. Kalay et al. [19] reported a very high percentage of cusp fractures in endodontically treated elements directly reconstructed without cusp coverage, with percentages of more than 70% in premolars presenting MOD cavities. From a functional point of view, premolars are subjected to more uniform lateral forces during mastication and present a smaller amount of tooth structure compared to molars [20].
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