ABSTRACT
The purpose of the present study was to compare tooth mortality of root-resected molars with that of root-filled, single-rooted teeth. Survival rates were 68% for root-resected molars and 77% for root-filled single-rooted teeth over a 10-year period. This difference was not statistically significant. Ten-year survival of root-resected molars in patients with radiographic attachment loss in single-rooted teeth of greater than 6 mm was 56% while survival was as high as 89% for root-resected molar patients with radiographic attachment loss in single-rooted teeth less than or equal to 6 mm. In conclusion, the prognosis of root-resection is not poorer than the prognosis of single-rooted teeth with an equal susceptibility to periodontitis, if endodontic conditions and maintenance care are optimal.
Subject(s)
Molar/surgery , Tooth Loss/epidemiology , Tooth Root/surgery , Adult , Aged , Analysis of Variance , Female , Humans , Male , Middle Aged , Molar/diagnostic imaging , Observer Variation , Prognosis , Radiography , Random Allocation , Retrospective Studies , Root Canal Therapy , Survival Analysis , Tooth Loss/diagnostic imaging , Tooth Root/diagnostic imagingABSTRACT
The rôle of gingival granulation tissue, dental calculus and contaminated root cementum in marginal periodontal formation of new attachment was studied experimentally after chemical conditioning of the root surfaces of premolars and molars in 8 monkeys. Each treatment procedure was carried out in 4 monkeys. The other 4 monkeys served as controls. A morphometrical method was used to evaluate the results. It was concluded that a significant amount of new attachment including formation of new adhering cementum will result only on chemically-conditioned cementum surfaces. Small amounts of calculus or granulation tissue left in situ do not seem to influence healing, provided the cementum is left intact after chemical cleansing.
Subject(s)
Dental Calculus/physiopathology , Dental Cementum/physiopathology , Granulation Tissue/physiopathology , Periodontitis/therapy , Periodontium/physiology , Alveolar Process/anatomy & histology , Alveolar Process/physiology , Animals , Dental Calculus/therapy , Dental Cementum/surgery , Dental Plaque/therapy , Detergents/therapeutic use , Epithelial Attachment/physiology , Granulation Tissue/surgery , Macaca fascicularis , Periodontitis/surgery , Periodontium/anatomy & histology , Sarcosine/analogs & derivatives , Sarcosine/therapeutic use , Wound HealingABSTRACT
Experimental periodontitis was induced in monkeys by means of elastic orthodontic ligatures. The periodontally-involved teeth were then treated with different methods. At the end of the treatment period, the monkeys were sacrificed. The premolar-molar areas were dissected out and embedded in a low-viscosity embedding medium (Spurr). The results of the treatment procedures were analyzed on ground sections. Formation of new cementum and new bone was determined by means of tetracycline labeling. Root planing with an ultrasonic device or with hand instruments almost completely removed the cementum and a portion of the peripheral dentin. The root surface was more uneven after treatment with the ultrasonic device than after using hand instruments. No new attachment could be found after root planing. Cleaning of the periodontally-involved root surfaces with two detergents (cetylpyrimidinium chloride and sodium-N-lauroyl sarcosine) without root planing resulted in a significant amount of new attachment.