| Bowley JF |
------>authors3_c= ------>paper_class1=1 ------>Impact_Factor=0.748 ------>paper_class3=2 ------>paper_class2=1 ------>vol=98 ------>confirm_bywho=yjchen ------>insert_bywho=laitw ------>Jurnal_Rank=77.6 ------>authors4_c= ------>comm_author= ------>patent_EDate=None ------>authors5_c= ------>publish_day=1 ------>paper_class2Letter=None ------>page2=444 ------>medlineContent= ------>unit=E1400 ------>insert_date=20080313 ------>iam=2 ------>update_date=None ------>author=??? ------>change_event=4 ------>ISSN= ------>authors_c=Bowley JF ------>score=458 ------>journal_name=J Prosthet Dent ------>paper_name=Surface area improvement with grooves and boxes in molar crown preparations ------>confirm_date=20080315 ------>tch_id=082002 ------>pmid=18061737 ------>page1=436 ------>fullAbstract=STATEMENT OF PROBLEM: Axial-wall inclination has been shown to affect the stability of a cemented restoration in function, resulting in early restoration failure. PURPOSE: The purpose of this study was to evaluate surface area improvement with the use of supplemental grooves in tooth preparations for complete crowns. MATERIAL AND METHODS: The surface area preparation improvement in combinations of unfavorable/marginal height and axial-wall inclinations was quantified. A right regular pyramid was used to simulate a single mandibular molar tooth preparation with known axial-wall inclinations and vertical heights. Various combinations of these 2 variables allowed the calculation of surface areas with a formula for the area of a pyramid, cones, and right triangles through geometric/trigonometric manipulations. The pyramidal model system had a 9-mm square base with marginal and unfavorable vertical heights, 3 or 4 mm, and axial-wall inclination angles from 2 to 25 degrees. Conical-shaped grooves of varying lengths and widths, depending on height and axial-wall inclinations, were introduced with a tapered fissure bur. The percentage of surface area gained or lost through the supplementation with tapered grooves and boxes served as the dependent variables, alpha-factors (1) through (5). RESULTS: Significant area gains were demonstrated in all alpha-level comparisons. The greatest change was found in the 4-mm height grouping, as a positive 35.2% gain in the 25-degree level with 4 grooves. CONCLUSIONS: Axial-wall groove and box supplementation were shown to improve the surface areas of simulated mandibular molar preparations with unfavorable axial-wall inclination and vertical height levels. ------>tmu_sno=None ------>sno=16793 ------>authors2=Lai WF ------>authors3= ------>authors4= ------>authors5= ------>authors6= ------>authors6_c= ------>authors=Bowley JF ------>delete_flag=0 ------>SCI_JNo=None ------>authors2_c=??? ------>publish_area=0 ------>updateTitle=Surface area improvement with grooves and boxes in mandibular molar crown preparations. ------>language=2 ------>check_flag=None ------>submit_date=None ------>country=None ------>no=6 ------>patent_SDate=None ------>update_bywho=None ------>publish_year=2007 ------>submit_flag=None ------>publish_month=12 |