Abstract
Introduction: Composite resin (CR) is among the commonly used material for intraradicular reinforcement of weakened tooth roots. Purpose: This study was to compare the fracture resistance of experimentally weakened tooth roots reinforced using auto-polymerized composite resin and light-polymerized composite resin. Materials and Methods: Fifty-six extracted human maxillary incisors were divided into 2 groups (n = 28) and the root canals were over prepared to weaken it. The samples in Group Awere restored using lightcured CR Z100 and light-transmitting polymerizing post (Luminex), whereas Group B using auto-cured CR Alpha-dent. Both groups were placed with metal parapost cemented with a resin luting cement (Nexus 2). Specimens were subjected to compressive load (N) using Instron machine until fracture. Data were submitted to independent t test analysis of variance (p < 0.05). Results: There was no significant difference (p = 0.233) in fracture resistance between the teeth reinforced with light-polymerizing and auto-polymerizing CR are 549.3 (± 95.44) and 490.7 (± 110.37) respectively. Conclusion: The use of less technique sensitive autopolymerizing CR give equivalent benefit effect on reinforcing weakened roots, as the more commonly lightpolymerized composite resin. DOI: http://dx.doi.org/10.3329/bjms.v12i1.13353 Bangladesh Journal of Medical Science Vol. 12 No. 01 January13 pp.63-67
Highlights
In clinical practice, endodontically treated teeth commonly present restorative problems because of frequent insufficient sound coronal and radicular tooth structure[1,2,3]
The purpose of this study was to compare the fracture resistance of experimentally weakened roots after reinforcement with auto-polymerized composite resins and compare it to light-polymerized composite resin
600 N22, it was theoretically able to withstand the Results show that there is no difference between the mastication force
Summary
Endodontically treated teeth commonly present restorative problems because of frequent insufficient sound coronal and radicular tooth structure[1,2,3]. Other less conditions include developmental anomalies such as fusion and germination, internal resorption, iatrogenic damage resulting in large access preparations where flared root canals with thin dentinal walls are too weak to withstand normal masticatory forces and are prone to fracture[4,5]. The restorations of such teeth with a cast post can cause wedging forces which may result in fracture of an already weakened root. These conventional methods of restoration are unsatisfactory and often result in extraction of the teeth[6,7]
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