Clinical Study Of Intruding Overgrowth Molar By Implant

Objective: To observe the clinical effect of intruding overgrowth molar by implant.Methods: 1 Experiment group: Eight patients were selected as experimental group,in which a total of 9 implants would be insert,and must meet the demand of insufficient occlusal gingival distance(? 4mm).Six patients with missing molars,where a total of nine implants would be inputted later,and enough restoration space(occlusal gingival distances >4mm),were selected as control group.2 Experimental method 2.1 experimental group 2.1.1 First visit: Message as follows were taken and kept as initial condition for each patients: profile in buccal view of both side;periapical radiograph with paralleling technique of the implant and its opposing tooth;full mouth plastic model;occlusal gingival distance be measured;observed indexes of the teeth and implants;a temporary resin crown was be made for each implant basing on the healing abutment.Resin was piled up until formed a about 2mm premature contact in centric occlusion,Then,the temporary crown was cemented onto the healing abutment.2.1.2 subsequent visit:Resin was piled up on the surface of tmporary crown and indexes were observed in every review.2.1.3 Final restoration complete: Checked and re-formed crown premature contact as above in each review time,this treatment would be repeated until got an ideal occlusal gingival distance(?5mm).Some data like profile as in first visit were got from each case after removing the temporary crown.Two to three weeks later,after final crown be fixed onto the implant,message of profile in buccal view of both side,periapical radiograph by paralleling technique of the implant,and full mouth plaster model also be obtained as in first view.2.2 control group 2.2.1 took the impressions for restoration.2.2.2 Fixed final crown after 3 weeks,kept periapical radiograph 2.2.3 Three months later,took a periapical radiograph of the implant for reexamine.Results: 1.experimental group 1.1Subjective feeling:Most of the patients had slight discomforts during eating at the time of initial occlusion elevating.2-3 days later,the discomforts could self-relieve and gradually disappear.All the patients did not complain any symptoms of temporomandibular disorder and other discomforts in the whole process.1.2 The ultimate effect of intrusion:The opposing teeth of the 9 implants were significantly intruded and the mean distance of intrusion was(3.2889±1.0565)mm.1.3 Clinical examination results and X-ray showing of intruded teeth: There were no abnormal in the electric pulp values,teeth percussion,bleeding index and probing depth(PD);X-ray also showed that there was no root absorption,no widening of the periodontal ligament,and no low density in the apical area after the experiment.1.4 Clinical examination results of implants and X-ray analysis of the surrounding alveolar bone: There were no bad changes in BI and PD of the implant in every review time.The X-ray showed that there was no low-density bone area around implant.The absorption of the alveolar bone around the implants in the experimental group was:(0.0009±0.0792)mm.2.control group:There were no abnormalities in BI and PD of the implant in every review,X-ray taken at the time of restoration completed and three months later,showed that there was no low density region of the bone around implant;The absorption of the alveolar bone around implants in the control group was(0.1238±0.1371)mm.3.Comparative Analysis of the absorption of the alveolar bone around implants in experimental and control groups:The results are as follows: there was significant difference between experimental and control group(P<0.05).Conclusion: The method of using implant to intrude its overgrowth molar was effective,meanwhile,either implant or opposing tooth keep good health situation all the time,and also no abnormal absorption of the alveolar bone around the implant.