This study evaluated the clinical validity of the “Williams’s law of harmony” to select artificial teeth in complete dentures, in which there is a similarity between the face and maxillary central incisor (MCIs) shapes. Two photographs were taken (face and MCIs) from 79 students aged 18-25 years, and digitized using a Genius HR-7 scanner. Face and teeth tracings were performed from the photographs using a Easy Digitizer 1.2 software. A non-parametric Chi Square test was applied in the statistical analysis (p<0.05). Results showed a predominance of the square shape (55.70%) in relation to the triangular (27.85%) (p<0.01), and the ovoid (16.45%) (p<0.001) ones. Considering the MCIs shape, the square (67.09%) predominated in relation to the ovoid (18.99%) (p=0), and the triangular (13.92%.) (p=0) ones. The analysis among the shapes showed a lower proportion of identical (10.13%) when compared with no similar (48.10%) (p=0), and similar (41,77%) (p<0.001) ones. Authors concluded that the “Williams’ law of harmony” was not confirmed in the majority of the individuals, and further studies are necessary to actually define which theory satisfies the clinical requirements. The clinical experience and critical sense seem to be more important for a satisfactory esthetic result.
Tamaki T. Complete dentures. 4th ed. São Paulo: Sarvier; 1988. p. 165-75.
Young HA. Selecting the anterior tooth mold. J Prosthet Dent. 1954; 4: 748-60.
Frush JP, Fisher RD. The age factor in dentogenics. J Prosthet Dent. 1957; 7: 5-13.
Smith BJ. The value of the nose width as an esthetic guide in prosthodontics. J Prosthet Dent. 1975; 34: 562-73.
Varjão FM, Nogueira SS. Nasal width as a guide for the selection of maxillary Varjão FM, Nogueira SS. Nasal width as a guide for the selection of maxillary complete denture anterior teeth in four racial groups. J Prosthodont. 2006; 15: 353-8.
Williams JL. A new classification of human tooth forms with a special reference to a new system of artificial teeth. Dent Cosmos. 1914; 56: 627.
Sellen PN, Jagger DC, Harrison A. Methods used to select artificial anterior teeth for the edentulous patient: a historical overview. Int J Prosthodont. 1999; 12: 51-8.
Mavroskoufis F, Ritchie GM. The face-form as a guide for the selection of maxillary central incisors. J Prosthet Dent. 1980; 43: 501-5.
Seluk LW, Brodbelt RHW, Walker GF. A biometric comparison of face shape with denture tooth form. J Oral Rehabil. 1987; 14: 139-45.
Brodbelt RHW, Walker GF, Nelson D, Seluk LW. Comparison of face shape with tooth form. J Prosthet Dent. 1984; 52: 588-92.
Aldrovandi C. Complete dentures. 2th ed. Rio de Janeiro: Científica; 1956. p. 169-206.
Buchman JM. Atlas of complete denture prosthetics. Philadelphia: J. B. Lippincott; 1970. p. 33-8.
Stein MR. Williams’s classification of anterior tooth forms. J Am Dent Assoc. 1936; 23: 1512-8.
Wright WH. Selection and arrangement of artificial teeth for complete prosthetic dentures. J Am Dent Assoc. 1936; 23: 2291- 306.
DeSouza JCF, Tamaki T, Tamaki ST. Comparative study of the shape contour buccal of the superior central incisor with the shape of the face. RPG. 1997; 4: 114-20.
Kawauchi A. Selection of artificial teeth through of the anthropometry study of the Brazilian ethnic: distance inter canine, shape and length of the superior central incisor [dissertation]. São Paulo: School of Dentistry, University of São Paulo; 2001. 49p.
Sellen PN, Jagger DC, Harrison A. Computer generated study of the correlation between tooth, face, arch, forms and palatal contour. J Prosthet Dent. 1998; 80: 163-8.
Miráglia S, Freitas K, Pinto J. Comparative analysis of the distances mesion-distal and gingivo-incisal of the superior central incisors with the ruler trubyte tooth indicator. Braz Dent Sci. 2002; 5: 13-7.
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