|
KMID : 1004520100260010021
|
|
Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 1 p.21 ~ p.32
|
|
|
Clinical Convergence Angle of Prepared Tooth for full Veneer Crowns
|
|
Kim Sung-Jin
Bae Ah-Ran
Woo Yi-Hyung
Kim Hyeong-Seob
|
|
|
Abstract
|
|
|
The convergence angle of a prepared tooth is a very important factor in the retention and resistance of a crown
restoration. But various intraoral environments and clinician’s techniques make it difficult to obtain the ideal inclination.
Therefore, in this study, clinical convergence angle of a prepared tooth was investigated. The data was collected from the
patient models of prosthodontic residents and the patient models of general practitioners. The images of mesiodistal and
buccolingual surfaces were taken with a digital camera to evaluate the convergence angle on ‘ImageJ’ program. The images were classified according to the criteria (1. Clinician group, 2. Position in the dental arch, 3. The purpose of abutment preparation)and then analyzed. The mean convergence angle of a prepared tooth for Korean clinicians was 15.02° (±10.13°). 1. It was significant in the convergence angle between the general practitioner group and the prosthodontic resident group(p<0.05). 2. It was significant between the mesiodistal and buccolingual surface in the the prosthodontic resident group(p<0.05). 3. For the general practitioner group, it was significant when anteriors and premolars were compared with molars(p<0.05). For the prosthodontic resident group, it was significant when anteriors and premolars were compared with molars (p<0.05). 4. When divided into upper and lower arches, for the general practitioner group, it showed significant difference in the buccolingual aspect(p<0.05). Also in the prosthodontic resident group, it showed significant difference in the buccolingual aspect(p<0.05). 5. Dividing left and right sides of the arches, there was no significant difference in the general practitioner group and the prosthodontic resident group(p>0.05). 6. In the general practitioner group, it was significant in the mesiodistal axial convergence angle of single crown abutment and 3 unit bridge abutment(p<0.05). In the prosthodontic resident group, it was significant in the mesiodistal and overall axial convergence angle of single crown abutment and 3 unit bridge abutment(p<0.05). Clinical convergence angle of prepared tooth in Korea was included in agreement with other studies investigating convergence angle that ranged from 10 to 22 degrees, achieved in clinical practice.
|
|
|
KEYWORD
|
|
|
Convergence angle, Tooth preparation, Retention, Resistance
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|