|Baltic Dental and Maxillofacial Journal|
September, 2008, Vol. 10, No. 4
A 2-year follow-up study on standard length implants inserted into alveolar bone sites augmented with homografts
Veneer fracture in implant-supported metal-ceramic restorations. Part I: Overall success rate and impact of occlusal guidance
CLINICAL CASE REPORTS
© 2008 Stomatologija
Stomatologija 2008; 10 (4): 121-126 458 KB
Influence of ceramic inlays and composite fillings on fracture resistance of premolars in vitro
Antra Ragauska, Peteris Apse, Vladimirs Kasjanovs, Liga Berzina-Cimdina
Objective. The aim of this study was to assess the resistance of fracture of mesio-occlusal-distal (MOD) ceramic inlays and composite fillings in premolars and to compare fracture modes between the groups.
Material and methods. Twenty seven extracted intact human premolars were selected and divided into three groups: I intact teeth (control group), II MOD cavities restored with indirect ceramic inlays (Finesse, Dentsply Ceramco, USA), III MOD cavities restored with direct composite fillings (Filtek P60, 3M ESPE, USA). The fracture resistance (N) was assessed under axial compressive loading with a metal cylinder 3.2 mm in diameter at a cross-head speed of 0.5 mm/min in a universal testing machine. The data were analyzed with ANOVA and t-test (pd£0.05). Fracture modes were recorded based on the degree of tooth structure and restoration damage.
Results. The mean force applied to cause failure for group I was 1.218 kN ±0.223, for group II 1.407 kN ±0.374 and for group III 0.941 kN ±0.258. T-test showed significant difference between groups I and III (p=0.027), and groups II and III (p=0.008). The fracture modes observed in all groups tended to involve restoration’s and cusp’s fracture.
Conclusion. It was observed that ceramic inlays in premolars have higher load to fracture value than composite fillings and similar to intact teeth. Both restorations, ceramic and composite in the premolars, tended to fracture together with palatal cusp of tooth.
Key words: ceramic inlays, direct composite, fracture resistance.
Received: 25 07 2008
Accepted for publishing: 22 12 2008
Antra Ragauska DDS, assistant, Department of Prosthodontics, Faculty of Stomatology, Riga Stradins University, Latvia
Peteris Apse DDS, MSc (Toronto), Dr. Habil. Med., professor and acting head at Department of Prosthodontics, Faculty of Stomatology, Riga Stradins University, Latvia
Vladimirs Kasjanovs Dr. Habil. Sc. Ing., professor, Riga Stradins University, Latvia
Liga Berzina-Cimdina Dr.Sc.Ing., asoc. professor, Riga Technical University, Latvia
Address correspondence to Dr. Antra Ragauska: Department of Prosthodontics, Faculty of Stomatology, Riga Stradins University, 20 Dzirciema Street, Riga, LV-1007, Latvia.