Effect of Present a Screw Access Hole on The Fracture Resistance of High Translucent Monolithic Zirconia Crown on Dental Implant
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Abstract
The objective of this study was to compare the fracture resistance of high translucent monolithic zirconia crowns (Cercon xt ML and Katana STML) with a screw access hole to those without a screw access hole on implants. The maxillary first premolar crowns were made using the CAD/CAM process as crowns, both with and without a screw hole, on the implant abutments in 40 specimens, which can be divided into four groups (n=10). These include: Group 1 Cercon xt ML with a screw access hole (CS); Group 2 Cercon xt ML without a screw access hole (CNS); Group 3 Katana STML with a screw access hole (KS); and Group 4 Katana STML without a screw access hole (KNS). All specimens were thermocycled for 10,00 cycles between 5°C to 55°C, with a dwell time of 30 seconds at room temperature. Also, cyclic loading was applied by placing a stainless-steel sphere indenter on the center of the transverse ridge of the crowns. The cyclic load was applied to a load of 50 N, with a frequency of 4 Hz, for 250,000 cycles before fracture resistance testing with a universal testing machine. Moreover, a stainless-steel sphere indenter was placed on the center of the transverse ridge of the crowns with a crosshead speed of 0.5 mm/min. until the crowns fractured. The fracture specimens were analyzed the fracture surface under a scanning electron microscopy. Data was analyzed by two-way analysis of variance test (ANOVA) and t-test (p<0.05). Two-way ANOVA results showed that the crowns with a screw access hole (CS and KS) had a significantly different mean fracture resistance, comparing to the crowns without a screw access hole (CNS and KNS) (p<0.001). Furthermore, the mean fracture resistance between Cercon xt ML and Katana STML crowns was not statistically significant (p=0.072). The t-test analysis revealed that the mean fracture resistance of both brands with a screw access hole on the crown was statistically significantly different (p<0.05), while the mean fracture resistance of both brands without a screw access hole was not statistically significantly different (p>0.05). For analyzing the mean of fracture resistance of the same brand, both with and without a screw access hole, it was shown that each brand of the crown had a statistically significant difference (p<0.05). In conclusion, high translucent monolithic zirconia crowns with a screw access hole had less fracture resistance than those without a screw access hole. However, there was no difference in the mean fracture resistance between the two brands of crowns without a screw access hole.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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