Anat Cell Biol.  2015 Dec;48(4):284-291. 10.5115/acb.2015.48.4.284.

Evaluation of the effectiveness of the new tooth wear measurement parameters

• Lee SH
• Nam SE
• Lee SP

• KMID: 2133269
• DOI: http://doi.org/10.5115/acb.2015.48.4.284

Abstract

Nowadays, there has been an increasing interest in the preservation of natural dentition and the proper occlusion related to tooth wear for quality of life. To overcome the problems of the existing qualitative tooth wear analysis method, virtual three-dimensional models have been used. This study was designed to develop and validate a new quantitative method using tooth wear measurement parameters with angles obtained from virtual vectors and planes of the three-dimensional models. Sixteen parameters were evaluated in the virtual models of 20 students (7.57+/-1.55 years old) and 20 adults (56.85+/-6.34 years old). There were 12 angle and 4 height parameters, and the number of parameters measured from the virtual planes and vectors were 10 and 6, respectively. For each parameter, means and standard deviations were calculated, and an unpaired sample t test was performed to compare the young and the adult groups. Also, differences between the means were determined and expressed as percentages. The results were statistically significant between the two groups (P<0.001). In general, parameters using virtual vectors showed greater change than virtual plane. Although there were statistically significant differences among all parameters using virtual planes (P<0.001), the changes of the three angles were similar, except distolingual cusp angle. It was found that the parameters using virtual vectors were effective and tooth wear took place in both buccal and lingual cusps. Likewise, the validation of the new measurement parameters suggests that they can also be applied in the assessment of tooth wear related to dental biomaterials.

Keyword

Tooth wear; Validity; Virtual models; Measurement parameters

MeSH Terms

Adult
Biocompatible Materials
Dentition
Humans
Quality of Life
Tooth Wear*
Tooth*
Biocompatible Materials

Figure

• 

  Fig. 1 Reference points, vectors, and planes. (A) MBV1, DBV1, MLV1, DLV1. (B) MBV2, DBV2, MLV2, DLV2, BCV, LCV. (C) BP. (D) LP. MBV1 (mesiobuccal cusp vector 1), the vector connecting mesiobuccal cusp point (MBCP) and central pit point (CPP); DBV1 (distobuccal cusp vector 1), the vector connecting distobuccal cusp point (DBCP) and CPP; MLV1 (mesiolingual cusp vector 1), the vector connecting mesiolingual cusp point (MLCP) and CPP; DLV1 (distolingual cusp vector 1), the vector connecting distolingual cusp point (DLCP) and CPP; MBV2 (mesiobuccal cusp vector 2), the vector connecting MBCP and buccal lowest point (BLP); DBV2 (distobuccal cusp vector 2), the vector connecting DBCP and BLP; MLV2 (mesiolingual cusp vector 2), the vector connecting MLCP and lingual lowest point (LLP); DLV2 (distolingual cusp vector 2), the vector connecting DLCP and LLP; BCV (buccal cusps vector), the vector connecting MBCP and DBCP; LCV (lingual cusps vector), the vector connecting MLCP and DLCP; BP (buccal occlusal plane), the plane consisting of MBCP, DBCP, and MLCP; LP (lingual occlusal plane), the plane consisting of MBCP, MLCP, and DLCP.

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  Fig. 2 Measurement parameters. (A) MBCA_BP. (B) DBCA_BP. (C) MLCA_BP. (D) DLCA_BP. (E) MBCA_LP. (F) DBCA_LP. (G) MLCA_LP. (H) DLCA_LP. (I) MBCA_BV. (J) DBCA_BV. (K) MLCA_LV. (L) DLCA_LV. (M) BCVH. (N) LCVH. (O) BCPH. (P) LCPH. MBCA_BP (mesiobuccal cusp angle with buccal occlusal plane [BP]), the angle between mesiobuccal cusp vector 1 (MBV1) and BP; DBCA_BP (distobuccal cusp angle with BP), the angle between distobuccal cusp vector 1 (DBV1) and BP; MLCA_BP (mesiolingual cusp angle with BP), the angle between mesiolingual cusp vector 1 (MLV1) and BP; DLCA_BP (distolingual cusp angle with BP), the angle between distolingual cusp vector 1 (DLV1) and BP; MBCA_LP (mesiobuccal cusp angle with lingual occlusal plane [LP]), the angle between MBV1 and LP; DBCA_LP (distobuccal cusp angle with LP), the angle between DBV1 and LP; MLCA_LP (mesiolingual cusp angle with LP), the angle between MLV1 and LP; DLCA_LP (distolingual cusp angle with LP), the angle between DLV1 and LP; MBCA_BV (mesiobuccal cusp angle with buccal cusps vector [BV]), the angle between mesiobuccal cusp vector 2 and BV; DBCA_BV (distobuccal cusp angle with BV), the angle between distobuccal cusp vector 2 and BV; MLCA_LV (mesiolingual cusp angle with lingual cusps vector [LV]), the angle between mesiolingual cusp vector 2 and LV; DLCA_LV (distolingual cusp angle with LV), the angle between distolingual cusp vector 2 and LV; BCVH (buccal cusps vector height), the shortest distance from buccal cusps vector to buccal lowest point; LCVH (lingual cusps vector height), the shortest distance from lingual cusps vector to lingual lowest point; BCPH (buccal cusps plane height), the shortest distance from BP to central pit point (CPP); LCPH (lingual cusps plane height), the shortest distance from LP to CPP.

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