ABSTRACT
Objective To analyze the characters of occlusal contact in patients with severe tooth wear. Methods The characters of occlusal contact in 20 cases with severe tooth wear and 20 persons with normal occlusion were measured with T-Scan Ⅱ occlusal analysis system. Results The offset degree in quantitative analysis showed that the offset in transversal and offset distance of center of force in the group with severe tooth wear[ ( 10. 5 ± 1.5 )mm, ( 12. 0 ± 1.3 ) mm ] were larger than control group [ (4. 5 ± 0. 8 )mm,(6. 5 ±0. 8)mm]. Occlusion time in severe tooth wear group[ (0.45 ±0.07)s]was shorter than control group(o)(0.78 ±0.06)s]. Lateral disclusion time in severe tooth wear group[ ( 1. 50 ±0. 08)s, ( 1.50 ±0.10) s ] was longer than control group [ ( 0. 93 ± 0. 07 ) s, ( 0.90 ± 0.11 ) s ]. Incidence rate of lateral occlusal interference in severe tooth wear group(70%) was higher than control group( 10%) (P ＜0.05). Offset in vertical of center of force [ ( 4.9 ± 1.0 ) mm ], protrusive disclusion time [( 1.02 ± 0. 09 ) s ], incidence rate of premature contact and protrusive occlusal contact interference( 20% ,30% ) showed no significantly statistical difference between two groups [ (4. 7 ± 0. 6 ) mm, (0. 96 ± 0. 06 ) s, 10% , 10% ] ( P ＞0. 05). Conclusion There were some differences in the characters of occlusal contact in patients with severe tooth wear.