A Novel Prefabricated Grid for Guided Endodontic Microsurgery.

INTRODUCTION: This study aimed to introduce a novel method using cone-beam computed tomographic (CBCT) imaging and prefabricated grids to guide apical access during endodontic microsurgery and to compare its accuracy with that of the nonguided method. METHODS: Forty-two roots from human cadaver jaws were selected. Twenty-one were randomly assigned to the experimental group (grid based) and their contralateral counterparts to the control group (nonguided). Preoperative CBCT images were used to design a drill path that intended to reach the palatal/lingual aspect of the roots without attempting to complete the osteotomy or to resect the entire root end. In the experimental group, prefabricated metal grids used during imaging and surgery acted as a reference in the design and drilling. Postoperative CBCT volumes were superimposed on the preoperative volumes, and the distances between the actual drill paths and the target points were measured. A dichotomized outcome of success versus failure was also recorded and compared. Statistical analysis was performed using the paired t test and Fisher exact test. RESULTS: The mean deviation of the drill paths from the target points was 0.66 mm ± 0.54 mm (mean ± standard deviation) for grid-based drilling and 1.92 mm ± 1.05 mm (mean ± standard deviation) for nonguided drilling (P < .001). Grid-based drilling was on average 1.27 mm (95% confidence interval, 0.81-1.72 mm) closer to the target point than nonguided drilling. The probability of successful drilling was also significantly higher with grids than without grids (P = .02). CONCLUSIONS: The proposed method of guided osteotomy and root-end resection using prefabricated grids was more accurate than the nonguided method.

Dentists' and dental students' attitudes, knowledge, preparedness, and willingness related to treatment of people living with HIV/AIDS in China.

OBJECTIVES: This study aims to assess the attitudes, knowledge, preparedness, and willingness of dentists and dental students to treat people-living-with-HIV/AIDS (PLWHA) in China, and to determine the factors associated with willingness to treat. METHODS: We surveyed dentists and dental students in hospitals and dental schools in five regions in China with varying PLWHA prevalence. Survey questions covered demographics, as well as four categories regarding treating PLWHA: knowledge (scaled 0-1), attitude (scaled 1-4), preparedness (scaled 1-4), and willingness to treat (scaled 1-4). Composite scores for each category were calculated as weighted means. Confounder-adjusted regression analysis was performed to determine the factor(s) correlated with willingness to treat. RESULTS: We collected 394 (84 percent) and 462 (90 percent) useable surveys from dentists and dental students respectively. Dentists' mean composite scores were 0.63 (poor knowledge), 2.1 (negative attitude), 2.8 (adequate preparedness), and 2.5 (neutral willingness). Students' mean composite scores were 0.64 (poor knowledge), 2.3 (negative attitude), 2.7 (adequate preparedness), and 2.6 (positive willingness). Forty-five percent of dentists and 59 percent of dental students had scores indicating positive willingness to treat. Attitude was the only factor consistently correlated with willingness to treat. Dentists and dental students scored low in all categories except for preparedness. CONCLUSION: It is imperative that knowledge of HIV/AIDS and attitudes toward PLWHA be further improved during dental training to increase the access to and effectiveness of dental care of PLWHA in China and to enhance their quality of life.