The effects of build angles on tissue surface adaptation of maxillary and mandibular complete denture bases manufactured by digital light processing

digital light processing;complete dneture bases;build angle;soft tissue adaptation;617.6

Jin Meicen치과보철학 전공 ;

University:서울대학교 대학원

关键词: digital light processing;    complete dneture bases;    build angle;    soft tissue adaptation;    617.6;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/161688/1/000000156376.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

Purpose: The effects of build angles on the tissue surface adaptation of complete denture bases manufactured by digital light processing (DLP) are unclear. The purpose of this in vitro study was to evaluate the effects of build angles on tissue surface adaptation of DLP-printed completed denture bases.Materials and methods: Both maxillary and mandibular denture bases were virtually designed on reference casts and fabricated by the DLP technique. For each arch, a total of 40 denture bases were fabricated with 4 different build angle conditions (90, 100, 135, and 150 degrees) and divided into 4 groups (90D, 100D, 135D, and 150D; 10 denture bases per group). The scanned intaglio surface of each DLP denture base was superimposed on the scanned edentulous area of the reference cast to compare the degree of tissue surface adaptation. Root mean square estimate (RMSE), positive average deviation (PA), and negative average deviation (NA) values were measured and displayed with a color deviation map. The Mann-Whitney test and Kruskal-Wallis analysis of variance were used for statistical analyses (α = .05).Results: No statistically significant differences were demonstrated for the RMSE among any build angle groups in either the maxillary or mandibular arch. With increase of build angles, the area of positive deviation in the maxillary arch moved from the palatal region to the posterior palatal seal area, and negative deviation became pronounced at the posterior tuberosities. In the maxillary arch, the 135D group exhibited favorable color distribution of surface deviation. In the mandibular arch, a positive deviation was detected at the labial slope to the crest of the ridge, whereas a negative deviation was observed at the buccal shelves and the retromolar pads. The 100D group showed a favorable distribution of surface deviation in the mandible.Conclusions: In both arches, the difference of overall tissue surface adaptation was not statistically significant at the 4 build angles. However, the color deviation map revealed that the 135-degree build angle may be appropriate in the maxillary DLP-printed denture base, and the 100-degree angle in the mandibular denture base.