Mechanical evaluation of fracture resistance of different length quartz fiber-reinforced composite posts

doi:10.3969/j.issn.2095-4344.2013.03.017

Abstract

Abstract:

BACKGROUND: Post length is the main influential factor in post retention. Scholars have different opinions about the mechanical effect on the prostheses with different post length.
OBJECTIVE: Under the situation of the resin adhesive, to compare the fracture strength of prostheses with different length quartz fiber-reinforced composite posts.
METHODS: Thirty extracted human maxillary central incisors were selected and divided into three groups of 10 samples in each group. One group was control group, and the other two groups in which crowns sectioned were treated with post way of 5 mm and 8 mm, respectively. Both of them were restored by quartz fiber posts with composite resin core and cast stainless steel crown. The control group was endodontically treated with teeth which were restored with stainless steel crown. All posts were bonded with resin adhesive. The boosting rod of mechanical test machine was put in the junction of cut 1/3 and middle 1/3. All posts were set in the palatal side with loading at angle of 130° to the long axis of root at 1 mm/min speed. The maximum load and failure mode were recorded.
RESULTS AND CONCLUSION: 5 mm length quartz fiber post resulted in no significantly difference in fracture strength with 8 mm length quartz fiber post. The fracture strength of control group was higher than that of quartz fiber post groups (P < 0.01). But in theory, all groups could endure masticator force. Both two groups with quartz fiber post mainly underwent post fracture, and the control group mainly underwent cervical oblique fracture. The shorter posts could make it possible to restore the shorter roots under the compensation function of resin adhesive. Quartz fiber posts and composite cores had lower possibility of root fracture and better aesthetic capability; they could become the effective choices for aesthetic restoration.

Key words: biomaterials, material mechanics and surface modification, quartz, fiber posts, metal crowns, prosthesis, fracture strength, fracture mode, resin binder, oral biomaterials, provincial grants-supported paper

CLC Number:

R318

Lu Jie1, Nie Er-min, Liu Ke-jin, Zhang Chun-yuan, Jiang Rui, Xia Yin-hua. Mechanical evaluation of fracture resistance of different length quartz fiber-reinforced composite posts[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(3): 483-488.

Figures/Tables 3

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