EFFECT OF TWO KINDS OF TOOTH PREPARATION ON FRACTURE RESISTANCE OF PORCELAIN LAMINATE VENEER AFTER EXPOSURE TO CYCLIC LOADS

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AMIN SALEHI E.; RAJAEI SEYED ALI

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Journal: Journal of Dental Medicine Year:2009 | Volume:21 | Issue:4 (57) Page(s): 264-271

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Title

EFFECT OF TWO KINDS OF TOOTH PREPARATION ON FRACTURE RESISTANCE OF PORCELAIN LAMINATE VENEER AFTER EXPOSURE TO CYCLIC LOADS

Author(s)

AMIN SALEHI E. | RAJAEI SEYED ALI | Issue Writer Certificate

Keywords

PORCELAIN LAMINATE VENEERQ3

FRACTURE RESISTANCEQ3

CYCLIC LOADSQ3

Abstract

Background and Aim: Because of stable aesthetic and minimum destructive technique, PORCELAIN LAMINATE VENEER has an important role in aesthetic dentistry. But main reason of failure in this treatment is restoration fracture. Therefore tooth preparations have an important role in FRACTURE RESISTANCE of PORCELAIN LAMINATE VENEER. The aim of this in vitro study was to evaluate the FRACTURE RESISTANCE of PORCELAIN LAMINATE VENEER dependent on tooth preparation after exposure to dynamic loading.Materials and Methods: In this study, 30 caries free mandibular incisors were devided into 3 groups. First group (Control group) remained unprepared. In second group (Window preparation) facial surface was prepared with 0.3, 0.5, 0.7 mm in cervical, middle and incisal, respectively. In third group (Incisal lap preparation) the preparation was like second group and included 2 mm of incisal edge. 20 feldespatic ceramic veneer were bonded adhesively with dual-cure luting cement (Rely X). All specimens were subjected to cyclic mechanical loading (720000 cycles, 1.3Hz, 30N) and thermal cycling (5-55 C, dwell time 60seconds, 500 cycles). The specimens were exposed to Universal testing machine until failure occurred with a constant crosshead speed of 1mm/min.Results: Five specimens of first group, one specimen of second group and two specimens of third group fractured during cyclic loading. The mean failure loads (MPa) after exposure to continues load were as follows: First group: 168/96 (561.01-1115.08), second group: 394.10 (248.92- 641.33) and third group: 273.47 (135.45 - 479.80). Data analysis was performed by ANOVA, LSD and chi Square test.Conclusion: Significant difference between 3 groups was found. FRACTURE RESISTANCE of control group was significantly higher than other groups and window group preparation was significantly higher than incisal lap group. The samples were under the CYCLIC LOADS before they put under the continuous pressures of universal testing machine. It was clear that incisal lap preparation is more resistance against fatigue failure compared to window preparation.

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APA: Copy

AMIN SALEHI, E., & RAJAEI, SEYED ALI. (2009). EFFECT OF TWO KINDS OF TOOTH PREPARATION ON FRACTURE RESISTANCE OF PORCELAIN LAMINATE VENEER AFTER EXPOSURE TO CYCLIC LOADS. JOURNAL OF DENTAL MEDICINE, 21(4 (57)), 264-271. SID. https://sid.ir/paper/25703/en

Vancouver: Copy

AMIN SALEHI E., RAJAEI SEYED ALI. EFFECT OF TWO KINDS OF TOOTH PREPARATION ON FRACTURE RESISTANCE OF PORCELAIN LAMINATE VENEER AFTER EXPOSURE TO CYCLIC LOADS. JOURNAL OF DENTAL MEDICINE[Internet]. 2009;21(4 (57)):264-271. Available from: https://sid.ir/paper/25703/en

IEEE: Copy

E. AMIN SALEHI, and SEYED ALI RAJAEI, “EFFECT OF TWO KINDS OF TOOTH PREPARATION ON FRACTURE RESISTANCE OF PORCELAIN LAMINATE VENEER AFTER EXPOSURE TO CYCLIC LOADS,” JOURNAL OF DENTAL MEDICINE, vol. 21, no. 4 (57), pp. 264–271, 2009, [Online]. Available: https://sid.ir/paper/25703/en

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